struts2 Interceptor详解

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