struts2 intercepter简单例子

玩了一天终于把struts2的intercepter搞明白了，有那么点小兴奋，呵呵。

下面把俺的成果分享一下：

1.在注册页面中（index.jsp）注册一下：

<%
     session.setAttribute("user","lzw");
      %>

2.在登录界面（login.jsp）登录：

<form action="login.action" method="post"> <table align="center"> <tr> <td> 用户名： </td> <td> <input type="text" name="userName" /> </td> </tr> <tr> <td> 密  码： </td> <td> <input type="password" name="password" /> </td> </tr> <tr align="center"> <td colspan="2"> <input type="submit" value="登录" /> </td> </tr> </table> </form>
3.登录类：LoginAction.java
 
package com.lzw.action; import java.util.Map; import com.opensymphony.xwork2.ActionContext; import com.opensymphony.xwork2.ActionSupport; public class LoginAction extends ActionSupport { private String userName; private String password; public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } @Override public String execute() throws Exception { System.out.println("开始执行execute()"); Map<String,Object> map = ActionContext.getContext().getSession(); String user = (String) map.get("user"); System.out.println("The user'name is ---------- "+user); return SUCCESS; } }
 
4.success.jsp页面
 
 welcome   ${userName} to struts2 world。
 
 
 

  
 
 

  5.拦截器类：LoginInterceper.java
 
 
 

  
 
 
package com.lzw.intercepter; import java.util.Map; import com.opensymphony.xwork2.Action; import com.opensymphony.xwork2.ActionInvocation; import com.opensymphony.xwork2.interceptor.AbstractInterceptor; public class LoginIntercepter extends AbstractInterceptor { @Override public String intercept(ActionInvocation invocation) throws Exception { Map<String, Object> session = invocation.getInvocationContext() .getSession(); String user = (String) session.get("user"); System.out.println("11---------------- " + user); if ("".equals(user)||null==user) { System.out.println("22---------------- "); return Action.INPUT; } else { System.out.println(" 33---------------- " + user); return invocation.invoke(); } } }
 
 

 
 
6.struts2配置文件struts.xml
 
 

 
 
<!DOCTYPE struts PUBLIC  
 
  
        "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"  
 
  
        "http://struts.apache.org/dtds/struts-2.0.dtd">
 
  
<struts>
 
  
 <package name="struts" extends="struts-default">
 
  
 <interceptors>
 
  
 <interceptor name="authority" class="com.lzw.intercepter.LoginIntercepter" />
 
  
 <interceptor-stack name="loginStack">
 
  
 <interceptor-ref name="authority" />
 
  
 <interceptor-ref name="defaultStack" />
 
  
 </interceptor-stack>
 
  
 </interceptors>
 
  
 <default-interceptor-ref name="loginStack" />
 
  

 
  
 <action name="login" class="com.lzw.action.LoginAction">
 
  
 <result>/success.jsp</result>
 
  
 <result name="input" type="redirect">/login.jsp</result>
 
  
 </action>
 
  
 </package>
 
  
</struts>  
 
 

 
 

 
 
7.web.xml
 
 

 
 
<?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>index.jsp</welcome-file>
 
  
  </welcome-file-list>
 
  
   <filter>
 
  
        <filter-name>struts2</filter-name>
 
  
        <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
 
  
    </filter>
 
  
    <filter-mapping>
 
  
        <filter-name>struts2</filter-name>
 
  
        <url-pattern>/*</url-pattern>
 
  
    </filter-mapping>
 
  
  
 
  
</web-app>

8.部署到tomcat服务器上，在地址栏上输入：http://localhsot:8080/test来注册，

再重新输入：http://localhost:8080/test/login.jsp