Struts2自定义拦截器实例—登陆权限验证

版本：struts2.1.6

此实例实现功能：用户需要指定用户名登陆，登陆成功进入相应页面执行操作，否则返回到登陆页面进行登陆，当直接访问操作页面（登陆后才能访问的页面）时则不允许，须返回登陆页面。

代码如下：

一、页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <title>yuewei'Login</title>

    <!--

    <link rel="stylesheet" type="text/css" href="styles.css" mce_href="styles.css">

    -->

  </head>

  <body>

  <form action="login.action" method="post">

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

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

  <input type="submit" value="submit">

  </form>

</body>

</html>

welcome.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <title> yuewei's Welcome</title>

 <!--

 <link rel="stylesheet" type="text/css" href="styles.css" mce_href="styles.css">

 -->

  </head>

  <body>

  <h1>登录成功后显示此页面</h1>

  <a href="show.action" mce_href="show.action">show</a>

  </body>

</html>

show.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

  <head>

    <title>yuewei's Show</title>

    <!--

    <link rel="stylesheet" type="text/css" href="styles.css" mce_href="styles.css">

    -->

  </head>

  <body>

    Show This Page

        登录后执行此页面<br>

  </body>

</html>

二、Action

LoginFormAction

package com.ywjava.action;

import com.opensymphony.xwork2.ActionSupport;

public class LoginFormAction extends ActionSupport {

    public String exexcute() {

        return "success";

    }

}

LoginAction

package com.ywjava.action;

import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionSupport;

import com.ywjava.utils.Constants;

public class LoginAction extends  ActionSupport{

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;

}

private boolean isInvalid(String value) {

    return (value == null || value.length() == );

}

public String execute(){

        System.out.println(username);

        System.out.println(password);

         if (isInvalid(getUsername()))

                return INPUT;   

            if (isInvalid(getPassword()))

                return INPUT;   

    if(this.getUsername().equals("yuewei")&& this.getPassword().equals("yuewei")){

        ActionContext.getContext().getSession().put(Constants.USER_SESSION,getUsername());

        ActionContext.getContext().getSession().put(Constants.PASS,getPassword());

        return "success";

    }

    return "error";

}

}

ShowAction

package com.ywjava.action;

import com.opensymphony.xwork2.ActionSupport;

public class ShowAction extends ActionSupport {

 public String execute() {

  return "success";

 }

}

三、拦截器

package com.ywjava.interceptot;

import java.util.Map;

import com.opensymphony.xwork2.Action;

import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

import com.ywjava.utils.Constants;

public class LoginInterceptor extends AbstractInterceptor {

    @Override

    public String intercept(ActionInvocation invocation) throws Exception {

        // 取得请求相关的ActionContext实例

        ActionContext ctx = invocation.getInvocationContext();

        Map session = ctx.getSession();

        String user = (String) session.get(Constants.USER_SESSION);

        // 如果没有登陆，或者登陆所有的用户名不是yuewei，都返回重新登陆

        if (user != null && user.equals("yuewei")) {

            System.out.println("test");

            return invocation.invoke();

        }

        ctx.put("tip", "你还没有登录");

        return Action.LOGIN;

    }

}

四 struts.xml

<?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="authority" extends="struts-default">

        <!-- 定义一个拦截器 -->

        <interceptors>

            <interceptor name="authority"

                class="com.ywjava.interceptot.LoginInterceptor">

            </interceptor>

            <!-- 拦截器栈 -->

            <interceptor-stack name="mydefault">

                <interceptor-ref name="defaultStack" />

                <interceptor-ref name="authority" />

            </interceptor-stack>

        </interceptors>

        <!-- 定义全局Result -->

        <global-results>

            <!-- 当返回login视图名时，转入/login.jsp页面 -->

            <result name="login">/login.jsp</result>

        </global-results>

        <action name="loginform"

            class="com.ywjava.action.LoginFormAction">

            <result name="success">/login.jsp</result>

        </action>

        <action name="login" class="com.ywjava.action.LoginAction">

            <result name="success">/welcome.jsp</result>

            <result name="error">/login.jsp</result>

            <result name="input">/login.jsp</result>

        </action>

        <action name="show" class="com.ywjava.action.ShowAction">

            <result name="success">/show.jsp</result>

            <!-- 使用此拦截器 -->

            <interceptor-ref name="mydefault" />

        </action>

    </package>

</struts>

巴特西

Struts2自定义拦截器实例—登陆权限验证

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