WDMyCloud中使用Subversion Server的时候，发现工程名字为中文的情况下，无法下载代码，此时Subversion客户端报告：
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svn: E210005: No repository found in "svn://xx.xx.xx/中文路径的UTF-8编码(%E4%B8之类)" |
解决方法是在启动Subversion Server之前指定语言为中文，如下：
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export LC_ALL="zh_CN.utf8" |
其他的的参考如下链接:
WD MyCloud中设置服务在开机时候自动启动
如果客户端工具是TortoiseSVN，直接在工作副本上右键，选择TortoiseSVN->relocation(重新定位)，再输入新的URL。
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$ cat /etc/redhat-release Redhat Enterprise Linux Server release 7.2 (Paladin) |
最近遇到一个比较奇葩的事情，就是编译出来的APK的AndroidManifest.xml中的application标签中一直包含android:debuggable="true"。不管是release版本，还是debug版本，不管如何设置，最终生成的文件中的调试选项一直是处于开启状态。
一时间竟然有些无从下手的感觉。首先确认我们自己的配置文件是没有问题的，那么这个现象一定是引入了某个aar中引入的AndroidManifest.xml中存在这个android:debuggable="true"，导致Android Studio在最终合并AndroidManifest.xml文件的时候，把这个选项给合并进来了。
那么我们既然已经知道引入的地方，因此就只需要针对这种情况进行剖析即可了。
执行gradlew build之后，我们在app\build\intermediates\exploded-aar目录下面可以找到我们引入的全部的依赖的aar。我们只需要逐个分析引入的aar包的AndroidManifest.xml文件即可。
那么比较奇葩，是奇葩在哪里呢？ 正常情况下，我们引入一个aar包，需要在build.gradle中声明如下：
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compile 'com.taobao.android:new-cache:2.3.0.73@aar' |
但是我们从真正的配置选项中看到的却是
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compile 'com.taobao.android:new-cache:2.3.0.73' |
按照一般的理解，我们如果没有设置@aar，那么Android Studio应该去下载对应的jar包才对。但是我们从实际的编译过程中看到，Android Studio在没有指定@aar的情况下，依旧默认去服务器上先尝试下载对应的aar，只有当aar找不到的时候才会去下载对应的jar包。而恰好，我们服务器上面两者都是存在的。于是出现了乌龙事件，本来只是需要下载jar包，结果却引入了一个莫名的aar包。而这个aar的开发同学又没有考虑到这种情况，以为用户只会用他提供的jar包。
解决方法还是比较简单的，就是明确告知Android Studio，我们需要的是jar包，也就是增加@jar。如下：
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compile 'com.taobao.android:new-cache:2.3.0.73@jar' |
接着上文IntelliJ IDEA 2016.2使用Spring 4.3.1.RELEASE搭建基于Tomcat-7.0.68的WebSocket应用
上文的最后我们说到，WebSocket是需要定时心跳的，否则会在一段时间后自动断开连接，而更重要的是，不是所有的浏览器都支持WebSocket，早期的IE 10之前的版本就是不支持的，而这一部分的设备其实是不算少的，而sockjs的出现，恰恰好来解决了这个问题。对于不支持WebSocket的浏览器，sockjs使用了多种方式来兼容这种情况，包括使用长轮询等方式，Spring更是内建支持这种方式。
下面我们看如何在上篇文章的基础上，增加对于sockjs的支持。
首先是STOMP的文档官网地址 http://stomp.github.io/
代码的地址为https://github.com/jmesnil/stomp-websocket，项目下面的lib/stomp.js就是我们想要的文件。也可以本站下载stomp.js.zip
接下来sockjs的代码地址https://github.com/sockjs/sockjs-client，项目下面的dist/sockjs-1.1.1.js就是我们想要的文件。也可以本站下载sockjs-1.1.1.js.zip
接下来我们把下载到的文件放到我们工程目录下面的web->resources->javascript目录下面，如下图：
接下来，添加我们需要的com.fasterxml.jackson.core:jackson-annotations:2.8.1,com.fasterxml.jackson.core:jackson-core:2.8.1,com.fasterxml.jackson.core:jackson-databind:2.8.1这三个jar包，增加的方式参照上一篇中对于javax.servlet:javax.servlet-api:3.1.0的操作方法。与上一篇的操作不同的是，这次添加的三个jar包,都要放到编译完成后的War包中。最后的结果如下图：
下面，我们开始进行代码的操作，我们在上篇文章中的src->Tools->WebSocket中新增两个源代码文件SockJsController.java,WebJsSocketConfig.java.如下图：
其中的代码如下：
SockJsController.java
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package Tools.WebSocket; import org.springframework.messaging.handler.annotation.MessageMapping; import org.springframework.messaging.handler.annotation.SendTo; import org.springframework.stereotype.Controller; @Controller public class SockJsController { @MessageMapping("/hello") @SendTo("/hello/subscribe") /*貌似这个名字可以随意的，主要用在stomp.subscribe时候的名字*/ public String Hello(String message) throws Exception { return new String("Hello"); } } |
WebJsSocketConfig.java
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package Tools.WebSocket; import org.springframework.context.annotation.Configuration; import org.springframework.messaging.simp.config.MessageBrokerRegistry; import org.springframework.web.socket.config.annotation.AbstractWebSocketMessageBrokerConfigurer; import org.springframework.web.socket.config.annotation.EnableWebSocketMessageBroker; import org.springframework.web.socket.config.annotation.StompEndpointRegistry; @Configuration @EnableWebSocketMessageBroker public class WebJsSocketConfig extends AbstractWebSocketMessageBrokerConfigurer { @Override public void configureMessageBroker(MessageBrokerRegistry config) { config.setApplicationDestinationPrefixes("/webSocketServer"); } @Override public void registerStompEndpoints(StompEndpointRegistry registry) { registry.addEndpoint("/hello").setAllowedOrigins("*").withSockJS(); } } |
然后修改WebSocket.jsp
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<%@ page contentType="text/html;charset=UTF-8" language="java" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>WebSocket/SockJS Echo Sample (Adapted from Tomcat's echo sample)</title> <style type="text/css"> #connect-container { float: left; width: 400px } #connect-container div { padding: 5px; } #console-container { float: left; margin-left: 15px; width: 400px; } #console { border: 1px solid #CCCCCC; border-right-color: #999999; border-bottom-color: #999999; height: 170px; overflow-y: scroll; padding: 5px; width: 100%; } #console p { padding: 0; margin: 0; } </style> <script src="./resources/javascript/sockjs-1.1.1.js"></script> <script src="./resources/javascript/stomp.js"></script> <script type="text/javascript"> var ws = null; var url = null; var transports = []; var stompClient = null; function setConnected(connected) { document.getElementById('connect').disabled = connected; document.getElementById('disconnect').disabled = !connected; document.getElementById('echo').disabled = !connected; } function connect() { if (!url) { alert('Select whether to use W3C WebSocket or SockJS'); return; } ws = (url.indexOf('sockjs') != -1) ? new SockJS(url,undefined, {transports: transports}) : new WebSocket(url); if((url.indexOf('sockjs') != -1)) { stompClient = Stomp.over(ws); stompClient.connect({}, function(frame) { setConnected(true); log('Connected: ' + frame); stompClient.subscribe('/hello/subscribe', function(message){ log(message.body); }); }); }else { ws.onopen = function () { setConnected(true); log('Info: connection opened.'); }; ws.onmessage = function (event) { log('Received: ' + event.data); }; ws.onclose = function (event) { setConnected(false); log('Info: connection closed.'); log(event); }; } } function disconnect() { if (ws != null) { ws.close(); ws = null; } stompClient = null; setConnected(false); } function echo() { if(stompClient != null){ var message = document.getElementById('message').value; stompClient.send("/webSocketServer/hello", {}, message); log('Sent: ' + message); }else { if (ws != null) { var message = document.getElementById('message').value; log('Sent: ' + message); ws.send(message); } else { alert('connection not established, please connect.'); } } } function updateUrl(urlPath) { if (urlPath.indexOf('sockjs') != -1) { url = urlPath; document.getElementById('sockJsTransportSelect').style.visibility = 'visible'; } else { if (window.location.protocol == 'http:') { url = 'ws://' + window.location.host + urlPath; } else { url = 'wss://' + window.location.host + urlPath; } document.getElementById('sockJsTransportSelect').style.visibility = 'hidden'; } } function updateTransport(transport) { transports = (transport == 'all') ? [] : [transport]; } function log(message) { var console = document.getElementById('console'); var p = document.createElement('p'); p.style.wordWrap = 'break-word'; p.appendChild(document.createTextNode(message)); console.appendChild(p); while (console.childNodes.length > 25) { console.removeChild(console.firstChild); } console.scrollTop = console.scrollHeight; } </script> </head> <body> <noscript><h2 style="color: #ff0000">Seems your browser doesn't support Javascript! Websockets rely on Javascript being enabled. Please enable Javascript and reload this page!</h2></noscript> <div> <div id="connect-container"> <input id="radio1" type="radio" name="group1" onclick="updateUrl('/webSocketServer');"> <label for="radio1">W3C WebSocket</label> <br> <input id="radio2" type="radio" name="group1" onclick="updateUrl('/webSocketServer/sockjs/hello');"> <label for="radio2">SockJS</label> <div id="sockJsTransportSelect" style="visibility:hidden;"> <span>SockJS transport:</span> <select onchange="updateTransport(this.value)"> <option value="all">all</option> <option value="websocket">websocket</option> <option value="xhr-polling">xhr-polling</option> <option value="jsonp-polling">jsonp-polling</option> <option value="xhr-streaming">xhr-streaming</option> <option value="iframe-eventsource">iframe-eventsource</option> <option value="iframe-htmlfile">iframe-htmlfile</option> </select> </div> <div> <button id="connect" onclick="connect();">Connect</button> <button id="disconnect" disabled="disabled" onclick="disconnect();">Disconnect</button> </div> <div> <textarea id="message" style="width: 350px">Here is a message!</textarea> </div> <div> <button id="echo" onclick="echo();" disabled="disabled">Echo message</button> </div> </div> <div id="console-container"> <div id="console"></div> </div> </div> </body> </html> |
最后，我们修改web->WEB-INF->web.xml，在其中增加
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<servlet-mapping> <servlet-name>dispatcher</servlet-name> <url-pattern>/webSocketServer/sockjs/*</url-pattern> </servlet-mapping> |
修改后的最终结果如下:
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<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1"> <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/applicationContext.xml</param-value> </context-param> <filter> <filter-name>struts2</filter-name> <filter-class>Tools.Filter.StrutsPrepareAndExecuteFilterEx</filter-class> <async-supported>true</async-supported> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <servlet> <servlet-name>dispatcher</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> <async-supported>true</async-supported> </servlet> <servlet-mapping> <servlet-name>dispatcher</servlet-name> <url-pattern>*.form</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>dispatcher</servlet-name> <url-pattern>/webSocketServer/*</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>dispatcher</servlet-name> <url-pattern>/webSocketServer/sockjs/*</url-pattern> </servlet-mapping> </web-app> |
Android Studio提供了比较方便的单元测试，但是由于Android系统的限制(Classloader是Google自己实现的，Powermock无法修改底层的bytecode)，目前Powermock还没办法直接在设备上执行测试，但是我们代码中难免存在一些静态对象，需要测试的时候，只能求助于Powermock与Robolectric的组合。
具体的配置如下:
1.首先在需要测试的项目的build.gradle中声明需要使用Powermock与Robolectric。
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testCompile 'junit:junit:4.12' testCompile 'org.powermock:powermock-api-mockito:1.6.5' testCompile 'org.powermock:powermock-module-junit4-rule:1.6.5' testCompile 'org.powermock:powermock-module-junit4:1.6.5' testCompile "org.powermock:powermock-classloading-xstream:1.6.5" /*不可使用3.1.x版本，3.1.x版本无法与PowerMock配合测试，运行时候直接报错*/ testCompile 'org.robolectric:robolectric:3.0' |
2.定义测试基类，在基类中声明一些必备的设置
AbsRobolectricPowerMockTest.java
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import android.os.Build; import org.junit.Rule; import org.junit.runner.RunWith; import org.powermock.core.classloader.annotations.PowerMockIgnore; import org.powermock.modules.junit4.PowerMockRunner; import org.powermock.modules.junit4.PowerMockRunnerDelegate; import org.powermock.modules.junit4.rule.PowerMockRule; import org.robolectric.RobolectricGradleTestRunner; import org.robolectric.annotation.Config; /** * Created by longsky.wq on 2016/8/22. */ @PowerMockRunnerDelegate(RobolectricGradleTestRunner.class) @RunWith(PowerMockRunner.class) @Config(constants = BuildConfig.class, sdk = Build.VERSION_CODES.JELLY_BEAN_MR1) @PowerMockIgnore({"org.mockito.*", "org.robolectric.*", "android.*","javax.crypto.","java.security.*"}) abstract public class AbsRobolectricPowerMockTest { @Rule public PowerMockRule rule = new PowerMockRule(); } |
3.定义真正的测试子类
DeckardActivityTest.java
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import org.junit.Test; import org.junit.Assert; import org.mockito.Mockito; import org.powermock.api.mockito.PowerMockito; import org.powermock.core.classloader.annotations.PrepareForTest; import static junit.framework.Assert.assertTrue; @PrepareForTest(Static.class) public class DeckardActivityTest extends AbsRobolectricPowerMockTest { @Test public void testStaticMocking() { /*如果如下断言失败，说明Robolectric环境没有初始化成功，说明配置存在问题*/ Assert.assertNotNull(RuntimeEnvironment.application); PowerMockito.mockStatic(Static.class); Mockito.when(Static.staticMethod()).thenReturn("hello mock"); assertTrue(Static.staticMethod().equals("hello mock")); } } |
注意，参考链接中的内容不可完全相信，按照参考链接中的配置（Robolectric-3.1.2+PowerMock-1.6.5），一般会遇到如下问题（看上去很怪异，其实是由于不同的classloader同时加载了相同的类，导致尽管类名是相同的，但是依旧无法进行类型转换）：
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com.thoughtworks.xstream.converters.ConversionException: Could not call org.apache.tools.ant.Project$AntRefTable.readObject() : Cannot convert type org.apache.tools.ant.Project to type org.apache.tools.ant.Project ---- Debugging information ---- class : org.apache.tools.ant.types.FileSet required-type : org.apache.tools.ant.types.FileSet converter-type : com.thoughtworks.xstream.converters.reflection.ReflectionConverter path : /org.powermock.modules.junit4.rule.PowerMockStatement$1/outer-class/fNext/this$1/outer-class/dependencyResolver/dependencyResolver/project/references/hashtable/org.apache.tools.ant.types.FileSet/project line number : 167 ------------------------------- message : Could not call org.apache.tools.ant.Project$AntRefTable.readObject() cause-exception : com.thoughtworks.xstream.converters.ConversionException cause-message : Cannot convert type org.apache.tools.ant.Project to type org.apache.tools.ant.Project class : org.apache.tools.ant.Project$AntRefTable required-type : org.apache.tools.ant.types.FileSet converter-type : com.thoughtworks.xstream.converters.reflection.SerializableConverter path : /org.powermock.modules.junit4.rule.PowerMockStatement$1/outer-class/fNext/this$1/outer-class/dependencyResolver/dependencyResolver/project/references/hashtable/org.apache.tools.ant.types.FileSet/project line number : 167 class[1] : org.apache.tools.ant.Project converter-type[1] : com.thoughtworks.xstream.converters.reflection.ReflectionConverter class[2] : org.robolectric.internal.dependency.MavenDependencyResolver class[3] : org.robolectric.internal.dependency.CachedDependencyResolver class[4] : org.robolectric.RobolectricGradleTestRunner class[5] : org.robolectric.RobolectricTestRunner$HelperTestRunner class[6] : org.robolectric.RobolectricTestRunner$HelperTestRunner$1 class[7] : org.powermock.modules.junit4.rule.PowerMockStatement class[8] : org.powermock.modules.junit4.rule.PowerMockStatement$1 version : not available ------------------------------- at com.thoughtworks.xstream.core.util.SerializationMembers.callReadObject(SerializationMembers.java:133) at com.thoughtworks.xstream.converters.reflection.SerializableConverter.doUnmarshal(SerializableConverter.java:455) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:263) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:480) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:412) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:263) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:480) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:412) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:263) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:480) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:412) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:263) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:480) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:412) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:263) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:480) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:412) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:263) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:480) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:412) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:263) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:480) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:412) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:263) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:480) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:412) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:263) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50) at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134) at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32) at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1206) at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1190) at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1061) at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1052) at org.powermock.classloading.DeepCloner.clone(DeepCloner.java:54) at org.powermock.classloading.AbstractClassloaderExecutor.executeWithClassLoader(AbstractClassloaderExecutor.java:56) at org.powermock.classloading.SingleClassloaderExecutor.execute(SingleClassloaderExecutor.java:67) at org.powermock.classloading.AbstractClassloaderExecutor.execute(AbstractClassloaderExecutor.java:43) at org.powermock.modules.junit4.rule.PowerMockStatement.evaluate(PowerMockRule.java:75) at org.robolectric.RobolectricTestRunner$2.evaluate(RobolectricTestRunner.java:250) at org.robolectric.RobolectricTestRunner.runChild(RobolectricTestRunner.java:176) at org.robolectric.RobolectricTestRunner.runChild(RobolectricTestRunner.java:49) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) at org.robolectric.RobolectricTestRunner$1.evaluate(RobolectricTestRunner.java:142) at org.junit.runners.ParentRunner.run(ParentRunner.java:363) at org.powermock.modules.junit4.internal.impl.DelegatingPowerMockRunner$2.call(DelegatingPowerMockRunner.java:148) at org.powermock.modules.junit4.internal.impl.DelegatingPowerMockRunner$2.call(DelegatingPowerMockRunner.java:140) at org.powermock.modules.junit4.internal.impl.DelegatingPowerMockRunner.withContextClassLoader(DelegatingPowerMockRunner.java:131) at org.powermock.modules.junit4.internal.impl.DelegatingPowerMockRunner.run(DelegatingPowerMockRunner.java:140) at org.powermock.modules.junit4.common.internal.impl.JUnit4TestSuiteChunkerImpl.run(JUnit4TestSuiteChunkerImpl.java:121) at org.powermock.modules.junit4.common.internal.impl.AbstractCommonPowerMockRunner.run(AbstractCommonPowerMockRunner.java:53) at org.powermock.modules.junit4.PowerMockRunner.run(PowerMockRunner.java:59) at org.junit.runner.JUnitCore.run(JUnitCore.java:137) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:234) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:74) Caused by: com.thoughtworks.xstream.converters.ConversionException: Cannot convert type org.apache.tools.ant.Project to type org.apache.tools.ant.Project ---- Debugging information ---- class : org.apache.tools.ant.types.FileSet required-type : org.apache.tools.ant.types.FileSet converter-type : com.thoughtworks.xstream.converters.reflection.ReflectionConverter path : /org.powermock.modules.junit4.rule.PowerMockStatement$1/outer-class/fNext/this$1/outer-class/dependencyResolver/dependencyResolver/project/references/hashtable/org.apache.tools.ant.types.FileSet/project line number : 167 ------------------------------- at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:439) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:263) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50) at com.thoughtworks.xstream.converters.reflection.SerializableConverter$2.readFromStream(SerializableConverter.java:337) at com.thoughtworks.xstream.core.util.CustomObjectInputStream.readObjectOverride(CustomObjectInputStream.java:120) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:364) at java.util.Hashtable.readObject(Hashtable.java:996) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at com.thoughtworks.xstream.core.util.SerializationMembers.callReadObject(SerializationMembers.java:125) ... 86 more |
使用Android Studio开发，最痛苦的其中一项是Maven下载数据缓慢,目前已经可以根据在Ubuntu 14.04 系统中的Apache Tomcat上部署Apache Archiva 2.2.1来使用本站的代理服务器的方式进行提速了。另一个痛苦的事情就是下载Gradle工具包的速度异常缓慢了,不仅慢，而且还容易失败。
目前本网站已经提供了Gradle工具包的下载代理，具体的操作就是把services.gradle.org进行域名污染，指向本站的IP地址121.199.27.227。
Windows下的解决方法为修改C:\Windows\System32\drivers\etc下的hosts文件，里面增加如下内容：
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# Copyright (c) 1993-2009 Microsoft Corp. # # This is a sample HOSTS file used by Microsoft TCP/IP for Windows. # # This file contains the mappings of IP addresses to host names. Each # entry should be kept on an individual line. The IP address should # be placed in the first column followed by the corresponding host name. # The IP address and the host name should be separated by at least one # space. # # Additionally, comments (such as these) may be inserted on individual # lines or following the machine name denoted by a '#' symbol. # # For example: # # 102.54.94.97 rhino.acme.com # source server # 38.25.63.10 x.acme.com # x client host # localhost name resolution is handled within DNS itself. # 127.0.0.1 localhost # ::1 localhost 121.199.27.227 services.gradle.org |
接着修改Android Studio项目下的gradle\wrapper\gradle-wrapper.properties文件，把其中的
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#Tue Aug 16 10:46:15 CST 2016 distributionBase=GRADLE_USER_HOME distributionPath=wrapper/dists zipStoreBase=GRADLE_USER_HOME zipStorePath=wrapper/dists distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip |
修改为：
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#Tue Aug 16 10:46:15 CST 2016 distributionBase=GRADLE_USER_HOME distributionPath=wrapper/dists zipStoreBase=GRADLE_USER_HOME zipStorePath=wrapper/dists distributionUrl=http\://services.gradle.org/distributions/gradle-2.14.1-all.zip |
注意，上面的修改其实主要是把HTTPS修改成了HTTP，原因在于HTTPS无法进行域名污染。
当然，另外一个比较简单的修改方式为，只要修改distributionUrl为本站地址，更加省事：
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#Tue Aug 16 10:46:15 CST 2016 distributionBase=GRADLE_USER_HOME distributionPath=wrapper/dists zipStoreBase=GRADLE_USER_HOME zipStorePath=wrapper/dists distributionUrl=https\://www.mobibrw.com/distributions/gradle-2.14.1-all.zip |
目前本站提供的Gradle工具包版本如下：
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gradle-2.10-all.zip.sha256 gradle-2.10-all.zip gradle-2.14.1-all.zip.sha256 gradle-2.14.1-all.zip gradle-6.6-all.zip.sha256 gradle-6.6-all.zip gradle-8.2.1-all.zip |
当前更建议大家使用 腾讯的国内镜像 https://mirrors.cloud.tencent.com/gradle/
在maven project项目中引入junit插件并不困难，只需要在pom.xml中配置好依赖包即可（IDE环境下，依赖项会自动生成）。另外，test类文件需要按照/src/main/java/的文件结构（main改为test）。
pom.xml
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<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.test</groupId> <artifactId>test</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <properties> <!--junit 的版本--> <junit.version>4.12</junit.version> </properties> <dependencies> <!-- 单元测试 --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>${junit.version}</version> <scope>test</scope> </dependency> </dependencies> </project> |
如下图：
在使用Ubuntu16.04 安装openjdk-7-jdk介绍的方式切换Java到1.7版本后,在进行代码调试的时候，Tomcat 7.0.68报告如下错误：
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java.lang.NoSuchMethodError: java.util.concurrent.ConcurrentHashMap.keySet()Ljava/util/concurrent/ConcurrentHashMap$KeySetView; at org.apache.catalina.core.ApplicationContext.getInitParameterNames(ApplicationContext.java:368) at org.apache.catalina.core.ApplicationContextFacade.getInitParameterNames(ApplicationContextFacade.java:367) at org.springframework.web.context.support.WebApplicationContextUtils.registerEnvironmentBeans(WebApplicationContextUtils.java:229) at org.springframework.web.context.support.AbstractRefreshableWebApplicationContext.postProcessBeanFactory(AbstractRefreshableWebApplicationContext.java:165) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:520) at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:444) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:326) at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5068) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5584) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:899) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:875) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652) at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1859) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:618) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:565) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:301) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1487) at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:97) at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1328) at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1420) at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:848) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322) at sun.rmi.transport.Transport$2.run(Transport.java:202) at sun.rmi.transport.Transport$2.run(Transport.java:199) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Transport.java:198) at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:567) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.access$400(TCPTransport.java:619) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$1.run(TCPTransport.java:684) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$1.run(TCPTransport.java:681) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:681) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) |
这说明Ubuntu 16.04下的Tomcat是在Java 8环境下面编译的，尽管我们已经切换到Java 7下面了，但是Tomcat并不能很好的执行我们的Java 7代码。这个时候的解决方法就是，编译代码的时候指定Java 7，但是在Tomcat执行的时候，指定使用Java 8来运行。
先参照 IntelliJ IDEA 2016.1建立Strut2工程并使用Tomcat调试建立新的工程，一步一步操作，包括最后引用Spring框架部分。
经过上面的操作，Spring-WebSocket的包应该已经被默认引入了，如下图所示：
这就意味着我们已经不需要再进行过多的额外配置了。
接下来，我们在src->Tools下面新建一个WebSocket的目录，里面创建三个Java文件。如下图：
每个文件中的代码如下：
SystemWebSocketHandler.java
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package Tools.WebSocket; import java.io.IOException; import java.util.ArrayList; import java.util.Date; import org.springframework.web.socket.CloseStatus; import org.springframework.web.socket.TextMessage; import org.springframework.web.socket.WebSocketMessage; import org.springframework.web.socket.WebSocketSession; import org.springframework.web.socket.handler.TextWebSocketHandler; public class SystemWebSocketHandler extends TextWebSocketHandler { private static final ArrayList<WebSocketSession> users = new ArrayList<>(); @Override public void afterConnectionEstablished(WebSocketSession session) throws Exception { System.out.println("ConnectionEstablished"); users.add(session); session.sendMessage(new TextMessage("connect")); session.sendMessage(new TextMessage("new_msg")); } @Override public void handleMessage(WebSocketSession session, WebSocketMessage<?> message) throws Exception { System.out.println("handleMessage" + message.toString()); session.sendMessage(new TextMessage(new Date() + "")); } @Override public void handleTransportError(WebSocketSession session, Throwable exception) throws Exception { if(session.isOpen()){ session.close(); } users.remove(session); } @Override public void afterConnectionClosed(WebSocketSession session, CloseStatus closeStatus) throws Exception { users.remove(session); } @Override public boolean supportsPartialMessages() { return false; } /** * 给所有在线用户发送消息 * * @param message */ public void sendMessageToUsers(TextMessage message) { for (WebSocketSession user : users) { try { if (user.isOpen()) { user.sendMessage(message); } } catch (IOException e) { e.printStackTrace(); } } } } |
WebSocketConfig.java
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package Tools.WebSocket; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer; import org.springframework.web.servlet.config.annotation.EnableWebMvc; import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter; import org.springframework.web.socket.WebSocketHandler; import org.springframework.web.socket.config.annotation.EnableWebSocket; import org.springframework.web.socket.config.annotation.WebSocketConfigurer; import org.springframework.web.socket.config.annotation.WebSocketHandlerRegistry; @Configuration @EnableWebMvc @EnableWebSocket public class WebSocketConfig extends WebMvcConfigurerAdapter implements WebSocketConfigurer { @Override public void registerWebSocketHandlers(WebSocketHandlerRegistry registry) { registry.addHandler(systemWebSocketHandler(), "/webSocketServer").addInterceptors(new WebSocketHandshakeInterceptor()); } @Bean public WebSocketHandler systemWebSocketHandler() { return new SystemWebSocketHandler(); } } |
WebSocketHandshakeInterceptor.java
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package Tools.WebSocket; import org.springframework.http.server.ServerHttpRequest; import org.springframework.http.server.ServerHttpResponse; import org.springframework.web.socket.WebSocketHandler; import org.springframework.web.socket.server.HandshakeInterceptor; import java.util.Map; public class WebSocketHandshakeInterceptor implements HandshakeInterceptor { @Override public boolean beforeHandshake(ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse, WebSocketHandler webSocketHandler, Map<String, Object> map) throws Exception { System.out.println("beforeHandshake"); return true; } @Override public void afterHandshake(ServerHttpRequest serverHttpRequest, ServerHttpResponse serverHttpResponse, WebSocketHandler webSocketHandler, Exception e) { System.out.println("afterHandshake"); } } |
由于我们使用了Struts2导致我们的网络请求优先被Struts2的拦截器拦截，而Struts2又处理不了websocket请求，结果直接返回了404错误。因此我们需要替换掉默认的在web.xml中定义的Struts2的拦截器，要求Struts2不处理websocket请求。
我们在src->Tools下面新建一个Filter的目录,下面创建一个名为StrutsPrepareAndExecuteFilterEx.java的源代码文件，如下图：
具体的代码如下：
StrutsPrepareAndExecuteFilterEx.java
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package Tools.Filter; import org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter; import javax.servlet.FilterChain; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; import java.io.IOException; public class StrutsPrepareAndExecuteFilterEx extends StrutsPrepareAndExecuteFilter { @Override public void doFilter(ServletRequest req, ServletResponse resp, FilterChain filter) throws IOException, ServletException { String requestURI = ((HttpServletRequest) req).getRequestURI(); if(requestURI != null && (requestURI.contains("/webSocketServer")) || requestURI.startsWith("ws://") || requestURI.contains("/mspjapi")) filter.doFilter(req, resp); else super.doFilter(req, resp, filter); } } |
这时候的代码是无法编译通过的，原因是依赖的javax的Jar包不存在。此时，我们需要手工引入javax.servlet:javax.servlet-api:3.1.0这个Jar包。如下图：
还要注意，刚刚添加进入的javax.servlet:javax.servlet-api:3.1.0这个Jar包，我们只在编译期间使用，在运行时候，使用Tomcat自己实现的那个同名Jar包。也就是这个包是个Provided，而不是Compile关系，具体如下图：
接下来，修改web.xml指定Struts2的拦截器为我们定义的拦截器
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<filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> |
修改为
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<filter> <filter-name>struts2</filter-name> <filter-class>Tools.Filter.StrutsPrepareAndExecuteFilterEx</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> |
经过上面的修改后，依旧是没办法进行网络访问的，原因是web.xml中的Spring拦截器并没有拦截WebSocket的数据请求。
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<servlet> <servlet-name>dispatcher</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> <async-supported>true</async-supported> </servlet> <servlet-mapping> <servlet-name>dispatcher</servlet-name> <url-pattern>*.form</url-pattern> </servlet-mapping> |
修改为
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<servlet> <servlet-name>dispatcher</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <load-on-startup>1</load-on-startup> <async-supported>true</async-supported> </servlet> <servlet-mapping> <servlet-name>dispatcher</servlet-name> <url-pattern>*.form</url-pattern> </servlet-mapping> <servlet-mapping> <servlet-name>dispatcher</servlet-name> <url-pattern>/webSocketServer/*</url-pattern> </servlet-mapping> |
注意增加的
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<async-supported>true</async-supported> |
下一步，配置Spring的配置文件web->WEB-INF->dispatcher-servlet.xml增加配置信息类的扫描目录包含我们刚刚创建的src->Tools->WebSocket的目录（缺少这一步会导致我们通过注解实现的配置信息类没有被自动加载，导致无法访问），修改后的内容如下:
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<?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd"> <!-- Scan for spring annotated components --> <context:component-scan base-package="Tools.WebSocket"/> </beans> |
最后，调用的页面的代码
WebSocket.jsp
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<%@ page contentType="text/html;charset=UTF-8" language="java" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>WebSocket</title> <style type="text/css"> #console-container { margin-left: 15px; margin-right: 15px; padding: 5px; width: 95%; } #console { border: 1px solid #CCCCCC; border-right-color: #999999; border-bottom-color: #999999; height: 300px; overflow-y: scroll; padding: 5px; width: 100%; } #console p { padding: 0; margin: 0; } </style> <script type="text/javascript"> var url = 'ws://' + window.location.host + '/webSocketServer'; var ws = new WebSocket(url); ws.onopen = function () { log('Info: connection opened.'); }; ws.onmessage = function (event) { log('Received: ' + event.data); }; ws.onclose = function (event) { log('Info: connection closed.'); log(event); }; function log(message) { var console = document.getElementById('console'); var p = document.createElement('p'); p.style.wordWrap = 'break-word'; p.appendChild(document.createTextNode(message)); console.appendChild(p); while (console.childNodes.length > 1000) { console.removeChild(console.firstChild); } console.scrollTop = console.scrollHeight; } </script> </head> <body> <div> <div id="console-container"> <div id="console"></div> </div> </div> </body> </html> |
最后的客户端显示效果如下图所示：
注意：如此创建的WebSocket是会在两三分钟后主动断开连接的，原因在于WebSocket需要周期性的发送心跳报文来维持连接。后续我们会尝试使用sockjs来实现自动发送心跳的逻辑。
具体的sockjs的接入方法，参考IntelliJ IDEA 2016.2使用Spring 4.3.1.RELEASE,sockjs-1.1.1,stomp-1.2搭建基于Tomcat-7.0.68的WebSocket应用