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Struts2自定义拦截器实例—登陆权限验证

2014-08-08 07:51 369 查看

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

login.jsp

[xhtml]
view plaincopy

<%@ 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>
    
  </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

[xhtml]
view plaincopy

<%@ 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>



  </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

[xhtml]
view plaincopy

<%@ 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>

    

  </head>

  <body>
    Show This Page
        登录后执行此页面<br>
  </body>
</html>

二、Action

LoginFormAction

[java]
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package com.ywjava.action;

import com.opensymphony.xwork2.ActionSupport;

public class LoginFormAction extends ActionSupport {
    public String exexcute() {
        return "success";
    }
}

LoginAction

[java]
view plaincopy

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() == 0);
}
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

[java]
view plaincopy

package com.ywjava.action;

import com.opensymphony.xwork2.ActionSupport;

public class ShowAction extends ActionSupport {
public String execute() {
  return "success";
}
}

三、拦截器

[java]
view plaincopy

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

[c-sharp]
view plaincopy

<?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">

        
        <interceptors>
            <interceptor name="authority"
                class="com.ywjava.interceptot.LoginInterceptor">
            </interceptor>
            
            <interceptor-stack name="mydefault">
                <interceptor-ref name="defaultStack" />
                <interceptor-ref name="authority" />
            </interceptor-stack>
        </interceptors>

        
        <global-results>
            
            <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>
            
            <interceptor-ref name="mydefault" />
        </action>

    </package>
</struts>

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