struts2 intercepter简单例子

http://weizhilizhiwei.iteye.com/blog/1005210

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&nbsp;&nbsp;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