JavaWeb_(Struts2框架)拦截器interceptor

时间：2023-03-09 06:55:06
JavaWeb_(Struts2框架)拦截器interceptor

　　此系列博文基于同一个项目已上传至github　　传送门

　　JavaWeb_(Struts2框架)Struts创建Action的三种方式　　传送门

　　JavaWeb_(Struts2框架)struts.xml核心配置、动态方法调用、结果集的处理　　传送门

　　JavaWeb_(Struts2框架)Log4j的配置以及解决中文乱码　　传送门

　　JavaWeb_(Struts2框架)参数传递之接收参数与传递参数　　传送门

　　JavaWeb_(Struts2框架)Ognl小案例查询帖子　　传送门

　　JavaWeb_(Struts2框架)Action中struts-default下result的各种转发类型　　传送门

　　JavaWeb_(Struts2框架)拦截器interceptor　　传送门

创建拦截器的两种方式

　　第一种：继承MethodFilterInterceptor父类【推荐】

package com.Gary.web.intercept;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.MethodFilterInterceptor;

//第一种创建拦截器的方式

public class MyIntercept extends MethodFilterInterceptor{

    @Override

    protected String doIntercept(ActionInvocation invocation) throws Exception {

        //放行

        return invocation.invoke();

    }

}

MyIntercept.java

　　

　　第二种：实现Interceptor接口

package com.Gary.web.intercept;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.Interceptor;

//第二种创建拦截器的方法

public class Intercept 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 invocation) throws Exception {

        // TODO Auto-generated method stub

        //放行

        return invocation.invoke();

    }

}

Intercept.java

　　在struts.xml中配置拦截器

　　　　<interceptors>

            <!-- 注册拦截器 -->

            <interceptor name="myIntercept" class="com.Gary.web.intercept.MyIntercept"></interceptor>

            <!-- 注册拦截器栈 -->

            <interceptor-stack name="myStack">

                <!-- 引入自己创建的拦截器 -->

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

                <!-- 引入strtus给你写好的拦截器(20个拦截器) -->

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

            </interceptor-stack>

        </interceptors>

        <!-- 指定包中的默认拦截器栈 -->

        <default-interceptor-ref name="myStack"></default-interceptor-ref>
<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE struts PUBLIC

    "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"

    "http://struts.apache.org/dtds/struts-2.5.dtd">

<struts>

    <constant name="struts.devMode" value="true"></constant>

    <constant name="struts.enable.DynamicMethodInvocation" value="true"></constant>

    <!-- name:配置包名 namespace:给action的访问路径定义一个命名空间 -->

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

        <interceptors>

            <!-- 注册拦截器 -->

            <interceptor name="myIntercept" class="com.Gary.web.intercept.MyIntercept"></interceptor>

            <!-- 注册拦截器栈 -->

            <interceptor-stack name="myStack">

                <!-- 引入自己创建的拦截器 -->

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

                <!-- 引入strtus给你写好的拦截器(20个拦截器) -->

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

            </interceptor-stack>

        </interceptors>

        <!-- 指定包中的默认拦截器栈 -->

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

        <!-- 增加动态方法调用的安全性 -->

        <global-allowed-methods>regex:.*</global-allowed-methods>

        <!-- action:配置action类

            name：决定了action访问的资源名称  servlet:url-pattern

            class:action的完整类名

            method:指定调用action中的哪个方法来去处理请求  -->

        <action name="LoginAction_*" class="com.Gary.web.UserAction" method="{1}">

            <!-- 默认为转发  redirect设置为重定向  -->

            <result name="success" type="redirect">/index.html</result>

            <!-- 默认为转发 -->

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

        </action>

        <action name="LoginActionDefault" class="com.Gary.web.DefaultAction" method="execute">

        </action>

        <action name="LoginActionImpl_*" class="com.Gary.web.ImplAction" method="{1}">

            <!-- 转发到LoginActionDefault -->

            <result name="defaultAction" type="chain">LoginActionDefault</result>

            <!-- 重定向到Action(LoginAction_*) -->

            <result name="toLogin" type="redirectAction">

                <param name="actionName">LoginAction_login</param>

                <param name="username">${username}</param>

                <param name="password">${password}</param>

            </result>

        </action>

    </package>

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

        <global-allowed-methods>regex:.*</global-allowed-methods>

        <action name="PasteAction_*" class="com.Gary.web.PasteAction" method="{1}">

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

        </action>

    </package>

</struts>

struts.xml

　　配置拦截器(拦截器只能控制访问Action,不能控制访问jsp)

　　在UserAction.java中当用户登陆成功时，放置user到ActionContext域中

boolean success = userService.findUser(user);

        if(success)

        {

            ActionContext.getContext().getSession().put("user", user);

            return "success";

        }else{

            ServletActionContext.getRequest().setAttribute("error", "用户名或密码错误！！！");

            return "error";

        }

　　实现MyIntercept.java拦截器

protected String doIntercept(ActionInvocation invocation) throws Exception {

        System.out.println("MyIntercept");

        //获取session

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

        //获取session中的user

        Object object = session.get("user");

        //判断session中是否有数据

        if(object!=null)

        {

            //有，放行

            return invocation.invoke();

        }

        else

        {

            //没有，重定向到login.jsp

            return "toLogin";

        }

    }

　　局部拦截器

        <action name="LoginActionDefault" class="com.Gary.web.DefaultAction" method="execute">

            <result name="tologin" type="redirect">/login.jsp</result>

        </action>

　　全局拦截器：如果每一个action都要单独配置一个局部兰机器，就会显得很麻烦，这时就可以使用<global-results>标签配置全局拦截器

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

        <global-results>

            <result name="toLogin" type="redirect">/login.jsp</result>

        </global-results>

　　配置放行登陆方法login的拦截器

        <interceptors>

            <!-- 注册拦截器 -->

            <interceptor name="myIntercept" class="com.Gary.web.intercept.MyIntercept"></interceptor>

            <!-- 注册拦截器栈 -->

            <interceptor-stack name="myStack">

                <!-- 引入自己创建的拦截器 -->

                <interceptor-ref name="myIntercept">

                    <param name="excludeMethods">login</param>

                </interceptor-ref>

                <!-- 引入strtus给你写好的拦截器(20个拦截器) -->

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

            </interceptor-stack>

        </interceptors>

　　此时，当用户未登录时，拦截器会拦截LoginActionDefault请求，并重定向到login.jsp中。当用户登陆后，会放行LoginActionDefault请求，并在控制台输出通过System.err.println("这是一个普通的action");输出红色的【这是一个普通的action】

JavaWeb_(Struts2框架)拦截器interceptor

　　

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>

<%@taglib uri="/struts-tags" prefix="s"%>

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8" />

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

</head>

<div class="dvhead">

    <div class="dvlogo">

        <a href="index.html">你问我答</a>

    </div>

    <div class="dvsearch">10秒钟注册账号，找到你的同学</div>

    <div class="dvreg">

        已有账号，立即&nbsp;<a href="login.html">登录</a>

    </div>

</div>

<div class="dvContent">

    <div class="dvquesleft">

        <div class="dvqstitle">

            <image class="imgbean" src="data:images/bean.jpg"> <span class="qsTitle">问答</span> <span class="back"><ab href="">《《返回上一页</a></span>

        </div>

        <div class="dvtabhead">

            <div class="tabheads tabcurrent">全部问题</div>

            <div class="tabheads">我的问题</div>

            <div class="tabheads">关注问题</div>

            <div class="tabheads">问题标签</div>

        </div>

        <div class="tabContent">

            <div class="dvtags">

                <a class="curenttag">待解决</a><span class="line"></span><a>高分</a><span class="line"></span><a>新回答</a><span class="line"></span><a>已解决</a>

            </div>

            <div class="tab">

                <s:iterator value="pasteList" var="paste">

                    <div class="dvques">

                        <div class="quesCount">

                            <div class="count"><s:property value="id"/></div>

                            <div class="ques">回答数</div>

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                                <s:property value="offer"/>

                                <image src="data:images/bean.jpg" class="bean"> <span

                                 class="spanques"><s:property value="title"/></span>

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                            <div class="tags">

                                <span class="tag">excel</span><span class="tag">程序</span>

                            </div>

                            <div class="quesUser">

                                <image src="data:images/0.gif" class="imguser" />

                                <div class="userName">

                                    <s:property value="#user.username"/>

                                    <div class="liulan">浏览(9) 30分钟前</div>

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                    </div>

                </s:iterator>

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            <div class="tab hidden">2</div>

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            <div class="tab hidden">4</div>

        </div>

    </div>

    <div class="dvquesright">

        <div>

            <buton class="btnques" onclick="location.href='add.html'">提个问题</buton>

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            <div class="orderTitle">专家排行榜</div>

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                <image class="userface" src="data:images/1.gif" />

                <div class="dvuser">

                    <div class="userTitle">陈有龙</div>

                    <div class="userdeital">大牛6级 豆:14006</div>

                </div>

            </div>

            <div class="users">

                <image class="userface" src="data:images/2.gif" />

                <div class="dvuser">

                    <div class="userTitle">陈有龙</div>

                    <div class="userdeital">大牛6级 豆:14006</div>

                </div>

            </div>

            <div class="users">

                <image class="userface" src="data:images/3.gif" />

                <div class="dvuser">

                    <div class="userTitle">陈有龙</div>

                    <div class="userdeital">大牛6级 豆:14006</div>

                </div>

            </div>

            <div class="users">

                <image class="userface" src="data:images/4.gif" />

                <div class="dvuser">

                    <div class="userTitle">陈有龙</div>

                    <div class="userdeital">大牛6级 豆:14006</div>

                </div>

            </div>

            <div class="users">

                <image class="userface" src="data:images/5.gif" />

                <div class="dvuser">

                    <div class="userTitle">陈有龙</div>

                    <div class="userdeital">大牛6级 豆:14006</div>

                </div>

            </div>

            <div class="users">

                <image class="userface" src="data:images/6.gif" />

                <div class="dvuser">

                    <div class="userTitle">陈有龙</div>

                    <div class="userdeital">大牛6级 豆:14006</div>

                </div>

            </div>

        </div>

    </div>

</div>

<script type="text/javascript" src="js/jquery-1.7.2.min.js"></script>

<script type="text/javascript">

    $(function()

    {

        $(".tabheads").click(function()

        {

            $(".tabheads").removeClass("tabcurrent").eq($(this).index()).addClass("tabcurrent");

            $(".tab").hide().eq($(this).index()).show();

        });

    });

</script>

<body>

</body>

</html>

index.jsp

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

<!DOCTYPE struts PUBLIC

    "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"

    "http://struts.apache.org/dtds/struts-2.5.dtd">

<struts>

    <constant name="struts.devMode" value="true"></constant>

    <constant name="struts.enable.DynamicMethodInvocation" value="true"></constant>

    <!-- name:配置包名 namespace:给action的访问路径定义一个命名空间 -->

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

        <interceptors>

            <!-- 注册拦截器 -->

            <interceptor name="myIntercept" class="com.Gary.web.intercept.MyIntercept"></interceptor>

            <!-- 注册拦截器栈 -->

            <interceptor-stack name="myStack">

                <!-- 引入自己创建的拦截器 -->

                <interceptor-ref name="myIntercept">

                    <param name="excludeMethods">login</param>

                </interceptor-ref>

                <!-- 引入strtus给你写好的拦截器(20个拦截器) -->

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

            </interceptor-stack>

        </interceptors>

        <!-- 指定包中的默认拦截器栈 -->

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

        <global-results>

            <result name="toLogin" type="redirect">/login.jsp</result>

        </global-results>

        <!-- 增加动态方法调用的安全性 -->

        <global-allowed-methods>regex:.*</global-allowed-methods>

        <!-- action:配置action类

            name：决定了action访问的资源名称  servlet:url-pattern

            class:action的完整类名

            method:指定调用action中的哪个方法来去处理请求  -->

        <action name="LoginAction_*" class="com.Gary.web.UserAction" method="{1}">

            <!-- 默认为转发  redirect设置为重定向  -->

            <result name="success" type="redirect">/index.html</result>

            <!-- 默认为转发 -->

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

        </action>

        <action name="LoginActionDefault" class="com.Gary.web.DefaultAction" method="execute">

        </action>

        <action name="LoginActionImpl_*" class="com.Gary.web.ImplAction" method="{1}">

            <!-- 转发到LoginActionDefault -->

            <result name="defaultAction" type="chain">LoginActionDefault</result>

            <!-- 重定向到Action(LoginAction_*) -->

            <result name="toLogin" type="redirectAction">

                <param name="actionName">LoginAction_login</param>

                <param name="username">${username}</param>

                <param name="password">${password}</param>

            </result>

        </action>

    </package>

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

        <global-allowed-methods>regex:.*</global-allowed-methods>

        <action name="PasteAction_*" class="com.Gary.web.PasteAction" method="{1}">

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

        </action>

    </package>

</struts>

struts.xml

package com.Gary.web.intercept;

import java.util.Map;

import com.opensymphony.xwork2.ActionContext;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.MethodFilterInterceptor;

//第一种创建拦截器的方式

public class MyIntercept extends MethodFilterInterceptor{

    @Override

    protected String doIntercept(ActionInvocation invocation) throws Exception {

        System.out.println("MyIntercept");

        //获取session

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

        //获取session中的user

        Object object = session.get("user");

        //判断session中是否有数据

        if(object!=null)

        {

            //有，放行

            return invocation.invoke();

        }

        else

        {

            //没有，重定向到login.jsp

            return "toLogin";

        }

    }

}

MyIntercept.java

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