struts2学习(6)自定义拦截器-登录验证拦截器

需求：对登录进行验证，用户名cy 密码123456才能登录进去；

　登录进去后，将用户存在session中；

其他链接要来访问(除了登录链接),首先验证是否登录，对这个进行拦截；

com.cy.model.User.java:

package com.cy.model;

public class User {

    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;

    }

}

com.cy.action.UserAction.java:

package com.cy.action;

import java.util.Map;

import com.cy.model.User;

import com.cy.service.UserService;

import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionSupport;

public class UserAction extends ActionSupport{

    private static final long serialVersionUID = 1L;

    private User user;

    private UserService userService = new UserService();

    private String error;

    public String getError() {

        return error;

    }

    public void setError(String error) {

        this.error = error;

    }

    public User getUser() {

        return user;

    }

    public void setUser(User user) {

        this.user = user;

    }

    @Override

    public String execute() throws Exception {

        if(userService.login(user)){

            ActionContext actionContext = ActionContext.getContext();

            Map<String, Object> session = actionContext.getSession();

            session.put("currentUser", user);

            return SUCCESS;

        }else{

            this.error = "用户名或密码错误";

            return ERROR;

        }

    }

}

com.cy.action.GrilAction.java:

package com.cy.action;

import com.opensymphony.xwork2.ActionSupport;

public class GrilAction extends ActionSupport{

    private static final long serialVersionUID = 1L;

    @Override

    public String execute() throws Exception {

        System.out.println("看美女");

        return SUCCESS;

    }

}

com.cy.interceptor.LoginInterceptor.java:

package com.cy.interceptor;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.Interceptor;

public class LoginInterceptor implements Interceptor{

    private static final long serialVersionUID = 1L;

    public void destroy() {

        System.out.println("LoginInterceptor销毁");

    }

    public void init() {

        System.out.println("LoginInterceptor初始化");

    }

    public String intercept(ActionInvocation invocation) throws Exception {

        System.out.println("在Action执行之前");

        ActionContext actionContext = invocation.getInvocationContext();

        Map<String, Object> session = actionContext.getSession();

        Object currentUser = session.get("currentUser");

        String result = null;

        if(currentUser != null){

            result = invocation.invoke();

        }else{

            HttpServletRequest request = (HttpServletRequest) invocation.getInvocationContext().get(ServletActionContext.HTTP_REQUEST);

            request.setAttribute("error", "请先登录！");

            result = "error";

        }

        System.out.println("在Action执行之后");

        return result;

    }

}

com.cy.service.UserService.java:

package com.cy.service;

import com.cy.model.User;

public class UserService {

    public boolean login(User user){

        if("cy".equals(user.getUserName()) && "123456".equals(user.getPassword())){

            return true;

        }else{

            return false;

        }

    }

}

struts.xml:

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC

    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"

    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

    <package name="manage" namespace="/" extends="struts-default">

        <interceptors>

            <interceptor name="loginInterceptor" class="com.cy.interceptor.LoginInterceptor"></interceptor>

            <interceptor-stack name="myStack">

                <interceptor-ref name="loginInterceptor"></interceptor-ref>

                <interceptor-ref name="defaultStack"></interceptor-ref>

            </interceptor-stack>

        </interceptors>

        <!-- package默认使用myStack 这个包下面的每个action默认使用myStack拦截器栈-->

        <default-interceptor-ref name="myStack"></default-interceptor-ref>

        <global-results>

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

        </global-results>

        <action name="gril" class="com.cy.action.GrilAction">

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

            <!-- 定义了默认的拦截器栈，这里就注释掉

                <interceptor-ref name="loginInterceptor"></interceptor-ref>

                <interceptor-ref name="defaultStack"></interceptor-ref>

             -->

        </action>

        <action name="user" class="com.cy.action.UserAction">

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

            <!-- 因为登录的时候不需要进行登录验证，不需要使用loginInterceptor

                  因此这里就写defaultStack

                  写了defaultStack action就不会再使用其他的拦截器了。

             -->

            <interceptor-ref name="defaultStack"></interceptor-ref>

        </action>

    </package>

</struts>

success.jsp:

<body>

    当前用户: ${currentUser.userName}

</body>

error.jsp:

<body>

    错误信息：${error} <a href="login.jsp">登录</a>

</body>

<body>

    <form action="user" method="post">

        用户名: <input type="text" name="user.userName"/><br>

        密码: <input type="text" name="user.password"/><br>

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

    </form>

</body>

测试：

没有登录，直接访问gril链接：

进行登录，并且登录成功：

再次访问gril链接就ok了，console：

在Action执行之前
看美女
在Action执行之后

-------------

巴特西

struts2学习(6)自定义拦截器-登录验证拦截器

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