深海游弋的鱼 – 默默的点滴

操作系统：CentOS 5.6

对于ubuntu 14.04来说，Tomcat的war包默认目录路径位置在 /var/lib/tomcat7/webapps

对于ubuntu 18.04来说，Tomcat的war包默认目录路径位置在 /var/lib/tomcat8/webapps 或 /var/lib/tomcat9/webapps

对于CentOS 7来说，Tomcat的war包默认目录路径位置在 /usr/share/tomcat/webapps

Tomcat版本：apache-tomcat-6.0.33

在Tomcat中部署war包很简单：

首先，直接把相应的war包放到$TOMCAT_HOME/webapps下，不用建目录；

然后，修改$TOMCAT_HOME/conf/server.xml，在Host配置段中添加类似于如下内容：

<Context path="/" docBase="hdfs-webdav.war" debug="0" privileged="true" reloadable="true"/>

1	<Context path="/" docBase="hdfs-webdav.war" debug="0" privileged="true" reloadable="true"/>

其中，docBase参数标识的是war包的名称。

访问时，使用如下地址进行访问：http://ip:port/hdfs-webdav

如果要把war包部署到Tomcat根目录，直接使用http://ip:port进行访问，需要的操作稍微复杂一些：

一、把war包解压，部署到除$TOMCAT_HOME/webapps以外的目录

二、删除$TOMCAT_HOME/ webapps/ROOT目录下的所有文件

三、在$TOMCAT_HOME/conf/Catalina/localhost目录下，新建一个ROOT.xml文件，写入类似于如下内容：

<?xml version='1.0' encoding='utf-8'?>
<Context path="/" docBase="/usr/local/tomcat-6.0/webdav" debug="0" privileged="true" reloadable="true"/>

1 2	<?xml version='1.0' encoding='utf-8'?> <Context path="/" docBase="/usr/local/tomcat-6.0/webdav" debug="0" privileged="true" reloadable="true"/>

其中，docBase指向的是war包解压后的目录名称，需绝对路径。

开发环境Eclipse+Tomcat7

1、先创建web project，项目名为Hello，

2、在WebRoot 目录下创建login.jsp文件，只需修改body中的内容，如下所示：

<body>
   <form action="login">
   username:<input type="text" name="username"><br>
   password:<input type="password" name="pwd"><br>
   <input type="submit">
   </form>
 </body>

<body>

username:<input type="text" name="username"><br>

password:<input type="password" name="pwd"><br>

</form>

</body>

3、在scr目录下的com.ht.servlet编写AcountBean.java文件，代码如下：

package com.ht.servlet;

public class AccountBean {
private String username = "";
private String password = "";
public String getPassword() {
 return password;
}
public void setPassword(String password) {
 this.password = password;
}
public String getUsername() {
 return username;
}
public void setUsername(String username) {
 this.username = username;
}
}

package com.ht.servlet;

public class AccountBean {

private String username = "";

private String password = "";

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

public String getUsername() {

return username;

}

public void setUsername(String username) {

this.username = username;

}

4、在scr目录下的com.ht.servlet编写servlet类CheckAccount.java文件，代码如下：

package com.ht.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

public class CheckAccount extends HttpServlet {

 @Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
  throws ServletException, IOException {
 doGet(req,resp);
 }

 @Override
public void doGet(HttpServletRequest req, HttpServletResponse resp)
  throws ServletException, IOException {
 HttpSession session = req.getSession();
  AccountBean account = new AccountBean();
  String username = req.getParameter("username");
 String pwd = req.getParameter("pwd");
  account.setPassword(pwd);
 account.setUsername(username);
  if((username != null)&&(username.trim().equals("jsp"))) {
  if((pwd != null)&&(pwd.trim().equals("1"))) {
   System.out.println("success");
   session.setAttribute("account", account);
    String login_suc = "success.jsp";
   resp.sendRedirect(login_suc);
    return;
  }
 }
 String login_fail = "fail.jsp";
 resp.sendRedirect(login_fail);
  return;
}

}

package com.ht.servlet;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

public class CheckAccount extends HttpServlet {

@Override

protected void doPost(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

doGet(req,resp);

}

@Override

public void doGet(HttpServletRequest req, HttpServletResponse resp)

throws ServletException, IOException {

HttpSession session = req.getSession();

AccountBean account = new AccountBean();

String username = req.getParameter("username");

String pwd = req.getParameter("pwd");

account.setPassword(pwd);

account.setUsername(username);

if((username != null)&&(username.trim().equals("jsp"))) {

if((pwd != null)&&(pwd.trim().equals("1"))) {

System.out.println("success");

session.setAttribute("account", account);

String login_suc = "success.jsp";

resp.sendRedirect(login_suc);

return;

}

String login_fail = "fail.jsp";

resp.sendRedirect(login_fail);

return;

}

5、在WebRoot目录下编写success.jsp文件成功后跳转

<body>
   <%
   AccountBean account = (AccountBean)session.getAttribute("account");
    %>
   username:<%= account.getUsername()%>
    <br>
    password:<%= account.getPassword() %>
 </body>

<body>

AccountBean account = (AccountBean)session.getAttribute("account");

username:<%= account.getUsername()%>

<br>

password:<%= account.getPassword() %>

</body>

6、在WebRoot目录下编写fail.jsp文件失败后跳转

<body>
  Login Failed! <br>
 </body>

<body>

</body>

7、修改web.xml配置文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 <welcome-file-list>
   <welcome-file>login.jsp</welcome-file>
 </welcome-file-list>

 <servlet>
      <description>This is the description of my J2EE component</description>
      <display-name>This is the display name of my J2EE component</display-name>
        <servlet-name>CheckAccount</servlet-name>
      <servlet-class>com.ht.servlet.CheckAccount</servlet-class>
    </servlet>

     <servlet-mapping>
      <servlet-name>CheckAccount</servlet-name>
      <url-pattern>/login</url-pattern>
    </servlet-mapping>

</web-app>

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.5"

xmlns="http://java.sun.com/xml/ns/javaee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

<welcome-file-list>

<welcome-file>login.jsp</welcome-file>

</welcome-file-list>

<description>This is the description of my J2EE component</description>

<display-name>This is the display name of my J2EE component</display-name>

<servlet-name>CheckAccount</servlet-name>

<servlet-class>com.ht.servlet.CheckAccount</servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>CheckAccount</servlet-name>

<url-pattern>/login</url-pattern>

</servlet-mapping>

</web-app>

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日期: 2013 年 9 月 2 日

部署War包到Tomcat根目录位置(Ubuntu/CentOS)

一个简单的Jsp+Servlet实例