Struts2拦截器—自定义拦截器验证用户登录_1.集成struts2自定义拦截器拦截用户登录(若登录则放行,否则需要登录)-优快云博客

本文详细介绍了如何使用Struts2框架实现登录流程，包括登录页面、登录成功页面以及验证用户界面的设计和代码实现。此外，还涉及了拦截器的配置以及web.xml文件的设置。

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没有太多的理论，直接上代码吧

首页面 index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
  </head>
  
  <body>
  <a href="test">test</a>
  <hr>
     <s:form action="login">
        <s:textfield name="username" label="用户名">
        </s:textfield>
        <s:submit value="提交"></s:submit>
     </s:form>
  </body>
</html>

2登录成功 success.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
  </head>
  
  <body>
     Welcome,<s:property value="username"></s:property>
  </body>
</html>

3 验证用户的界面 result.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'index.jsp' starting page</title>
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
  </head>
  
  <body>
       恭喜您，你已经成功登录！
  </body>
</html>

4 LoginAction.java

package com.bawei.demo;

import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport{
	
	private String username;
	

	public String getUsername() {
		return username;
	}


	public void setUsername(String username) {
		this.username = username;
	}

	public String execute() {
		
		HttpSession session=ServletActionContext.getRequest().getSession();
		session.setAttribute("username", username);
        System.out.println(username);
		return SUCCESS;
	}

}

Test.java

package com.bawei.demo;

public class TestAction {
	
	
	public String execute(){
		
		
		
		return "success";
	}

}

拦截器的代码：

package com.bawei.interceptor;

import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;

public class LoginInterceptor implements Interceptor {

	@Override
	public void destroy() {
		// TODO Auto-generated method stub

	}

	@Override
	public void init() {
		// TODO Auto-generated method stub

	}

	@Override
	public String intercept(ActionInvocation arg0) throws Exception {
		System.out.println("拦截器.......");
		HttpSession session = ServletActionContext.getRequest().getSession();
		String username = (String) session.getAttribute("username");
		if (username == null || username.equals("")) {
			return Action.LOGIN;
		} else {
			return arg0.invoke();
		}
	}

}

web.xml 配置文件的代码：

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
	<package name="demo" extends="struts-default">


		<interceptors>
			<interceptor name="login"
				class="com.bawei.interceptor.LoginInterceptor"></interceptor>
			<interceptor-stack name="loginStack">
				<interceptor-ref name="login"></interceptor-ref>
				<interceptor-ref name="defaultStack"></interceptor-ref>
			</interceptor-stack>
		</interceptors>
		<action name="login" class="com.bawei.demo.LoginAction">
			<result name="success">/success.jsp</result>
			<result name="input">/index.jsp</result>
			
		</action>
        <action name="test" class="com.bawei.demo.TestAction">
            <result name="success">/result.jsp</result>
			<result name="login">/index.jsp</result>
			<interceptor-ref name="loginStack"></interceptor-ref>
		</action>


	</package>




</struts>

工程源码

http://download.youkuaiyun.com/detail/shepherd1st/5297329