JavaWeb_(Struts2框架)攔截器interceptor

時間 2019-11-18

標籤 javaweb struts2 struts 框架攔截 interceptor 欄目 Java 简体版

原文原文鏈接

　　此係列博文基於同一個項目已上傳至github　　傳送門javascript

　　JavaWeb_(Struts2框架)Struts建立Action的三種方式　　傳送門css

　　JavaWeb_(Struts2框架)struts.xml核心配置、動態方法調用、結果集的處理　　傳送門html

　　JavaWeb_(Struts2框架)Log4j的配置以及解決中文亂碼　　傳送門java

　　JavaWeb_(Struts2框架)參數傳遞之接收參數與傳遞參數　　傳送門jquery

　　JavaWeb_(Struts2框架)Ognl小案例查詢帖子　　傳送門git

　　JavaWeb_(Struts2框架)Action中struts-default下result的各類轉發類型　　傳送門github

　　JavaWeb_(Struts2框架)攔截器interceptor　　傳送門web

建立攔截器的兩種方式apache

　　第一種：繼承MethodFilterInterceptor父類【推薦】安全

package com.Gary.web.intercept;

import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.MethodFilterInterceptor;

//第一種建立攔截器的方式
public class MyIntercept extends MethodFilterInterceptor{

    @Override
    protected String doIntercept(ActionInvocation invocation) throws Exception {
        

        //放行
        return invocation.invoke();
    }

}

MyIntercept.java

　　第二種：實現Interceptor接口

package com.Gary.web.intercept;

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

//第二種建立攔截器的方法
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中配置攔截器

　　　　<interceptors>
            <!-- 註冊攔截器 -->
            <interceptor name="myIntercept" class="com.Gary.web.intercept.MyIntercept"></interceptor>
            <!-- 註冊攔截器棧 -->
            <interceptor-stack name="myStack">
                <!-- 引入本身建立的攔截器 -->
                <interceptor-ref name="myIntercept"></interceptor-ref>
                <!-- 引入strtus給你寫好的攔截器(20個攔截器) -->
                <interceptor-ref name="defaultStack"></interceptor-ref>
            </interceptor-stack>
        </interceptors>
        
        <!-- 指定包中的默認攔截器棧 -->
        <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:給action的訪問路徑定義一個命名空間 -->
    <package name="MyPackage" namespace="/" extends="struts-default">
    
        
        <interceptors>
            <!-- 註冊攔截器 -->
            <interceptor name="myIntercept" class="com.Gary.web.intercept.MyIntercept"></interceptor>
            <!-- 註冊攔截器棧 -->
            <interceptor-stack name="myStack">
                <!-- 引入本身建立的攔截器 -->
                <interceptor-ref name="myIntercept"></interceptor-ref>
                <!-- 引入strtus給你寫好的攔截器(20個攔截器) -->
                <interceptor-ref name="defaultStack"></interceptor-ref>
            </interceptor-stack>
        </interceptors>
        
        <!-- 指定包中的默認攔截器棧 -->
        <default-interceptor-ref name="myStack"></default-interceptor-ref>
    
        <!-- 增長動態方法調用的安全性 -->
        <global-allowed-methods>regex:.*</global-allowed-methods>
    
        <!-- action:配置action類
            name：決定了action訪問的資源名稱  servlet:url-pattern 
            class:action的完整類名
            method:指定調用action中的哪一個方法來去處理請求  -->
            
        <action name="LoginAction_*" class="com.Gary.web.UserAction" method="{1}">
            <!-- 默認爲轉發  redirect設置爲重定向  -->
            <result name="success" type="redirect">/index.html</result>
            <!-- 默認爲轉發 -->
            <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}">
            <!-- 轉發到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

　　配置攔截器(攔截器只能控制訪問Action,不能控制訪問jsp)

　　在UserAction.java中當用戶登錄成功時，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", "用戶名或密碼錯誤！！！");
            return "error";
        }

　　實現MyIntercept.java攔截器

protected String doIntercept(ActionInvocation invocation) throws Exception {
        
        System.out.println("MyIntercept");
        
        
        //獲取session
        Map<String, Object> session = ActionContext.getContext().getSession();
        //獲取session中的user
        Object object = session.get("user");
        //判斷session中是否有數據
        if(object!=null)
        {
            //有，放行
            return invocation.invoke();
        }
        else
        {
            //沒有，重定向到login.jsp
            return "toLogin";
        }
            
    }

　　局部攔截器

        <action name="LoginActionDefault" class="com.Gary.web.DefaultAction" method="execute">
            <result name="tologin" type="redirect">/login.jsp</result>
        </action>

　　全局攔截器：若是每個action都要單獨配置一個局部蘭機器，就會顯得很麻煩，這時就能夠使用<global-results>標籤配置全局攔截器

        <default-interceptor-ref name="myStack"></default-interceptor-ref>
        <global-results>
            <result name="toLogin" type="redirect">/login.jsp</result>
        </global-results>

　　配置放行登錄方法login的攔截器

        <interceptors>
            <!-- 註冊攔截器 -->
            <interceptor name="myIntercept" class="com.Gary.web.intercept.MyIntercept"></interceptor>
            <!-- 註冊攔截器棧 -->
            <interceptor-stack name="myStack">
                <!-- 引入本身建立的攔截器 -->
                <interceptor-ref name="myIntercept">
                    <param name="excludeMethods">login</param>
                </interceptor-ref>
                <!-- 引入strtus給你寫好的攔截器(20個攔截器) -->
                <interceptor-ref name="defaultStack"></interceptor-ref>
            </interceptor-stack>
        </interceptors>

　　此時，當用戶未登陸時，攔截器會攔截LoginActionDefault請求，並重定向到login.jsp中。當用戶登錄後，會放行LoginActionDefault請求，並在控制檯輸出經過System.err.println("這是一個普通的action");輸出紅色的【這是一個普通的action】

<%@ 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">你問我答</a>
    </div>
    <div class="dvsearch">10秒鐘註冊帳號，找到你的同窗</div>
    <div class="dvreg">
        已有帳號，當即&nbsp;<a href="login.html">登陸</a>
    </div>
</div>
<div class="dvContent">
    <div class="dvquesleft">

        <div class="dvqstitle">
            <image class="imgbean" src="images/bean.jpg"> <span class="qsTitle">問答</span> <span class="back"><ab href="">《《返回上一頁</a></span>
        </div>
        <div class="dvtabhead">
            <div class="tabheads tabcurrent">所有問題</div>
            <div class="tabheads">個人問題</div>
            <div class="tabheads">關注問題</div>
            <div class="tabheads">問題標籤</div>
        </div>
        <div class="tabContent">
            <div class="dvtags">
                <a class="curenttag">待解決</a><span class="line"></span><a>高分</a><span class="line"></span><a>新回答</a><span class="line"></span><a>已解決</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">回答數</div>
                        </div>
                        <div class="quesContent">
                            <div class="quesTitle">
                                <s:property value="offer"/>
                                <image src="images/bean.jpg" class="bean"> <span
                                 class="spanques"><s:property value="title"/></span>
                            </div>
                            <div class="qContent"><s:property value="content"/></div>
                            <div class="tags">
                                <span class="tag">excel</span><span class="tag">程序</span>
                            </div>
                            <div class="quesUser">
                                <image src="images/0.gif" class="imguser" />
                                <div class="userName">
                                    <s:property value="#user.username"/>
                                    <div class="liulan">瀏覽(9) 30分鐘前</div>
                                </div>
                            </div>
                        </div>
                    </div>
                </s:iterator>

            </div>
            <div class="tab hidden">2</div>
            <div class="tab hidden">3</div>
            <div class="tab hidden">4</div>
        </div>
    </div>
    <div class="dvquesright">
        <div>
            <buton class="btnques" onclick="location.href='add.html'">提個問題</buton>
        </div>
        <div class="dvorder">
            <div class="orderTitle">專家排行榜</div>
            <div class="users">
                <image class="userface" src="images/0.gif" />
                <div class="dvuser">
                    <div class="userTitle">陳有龍</div>
                    <div class="userdeital">大牛6級 豆:14006</div>
                </div>
            </div>
            <div class="users">
                <image class="userface" src="images/1.gif" />
                <div class="dvuser">
                    <div class="userTitle">陳有龍</div>
                    <div class="userdeital">大牛6級 豆:14006</div>
                </div>
            </div>
            <div class="users">
                <image class="userface" src="images/2.gif" />
                <div class="dvuser">
                    <div class="userTitle">陳有龍</div>
                    <div class="userdeital">大牛6級 豆:14006</div>
                </div>
            </div>
            <div class="users">
                <image class="userface" src="images/3.gif" />
                <div class="dvuser">
                    <div class="userTitle">陳有龍</div>
                    <div class="userdeital">大牛6級 豆:14006</div>
                </div>
            </div>
            <div class="users">
                <image class="userface" src="images/4.gif" />
                <div class="dvuser">
                    <div class="userTitle">陳有龍</div>
                    <div class="userdeital">大牛6級 豆:14006</div>
                </div>
            </div>
            <div class="users">
                <image class="userface" src="images/5.gif" />
                <div class="dvuser">
                    <div class="userTitle">陳有龍</div>
                    <div class="userdeital">大牛6級 豆:14006</div>
                </div>
            </div>
            <div class="users">
                <image class="userface" src="images/6.gif" />
                <div class="dvuser">
                    <div class="userTitle">陳有龍</div>
                    <div class="userdeital">大牛6級 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:給action的訪問路徑定義一個命名空間 -->
    <package name="MyPackage" namespace="/" extends="struts-default">
    
        
        <interceptors>
            <!-- 註冊攔截器 -->
            <interceptor name="myIntercept" class="com.Gary.web.intercept.MyIntercept"></interceptor>
            <!-- 註冊攔截器棧 -->
            <interceptor-stack name="myStack">
                <!-- 引入本身建立的攔截器 -->
                <interceptor-ref name="myIntercept">
                    <param name="excludeMethods">login</param>
                </interceptor-ref>
                <!-- 引入strtus給你寫好的攔截器(20個攔截器) -->
                <interceptor-ref name="defaultStack"></interceptor-ref>
            </interceptor-stack>
        </interceptors>
        
        <!-- 指定包中的默認攔截器棧 -->
        <default-interceptor-ref name="myStack"></default-interceptor-ref>
        <global-results>
            <result name="toLogin" type="redirect">/login.jsp</result>
        </global-results>
    
        <!-- 增長動態方法調用的安全性 -->
        <global-allowed-methods>regex:.*</global-allowed-methods>
    
        <!-- action:配置action類
            name：決定了action訪問的資源名稱  servlet:url-pattern 
            class:action的完整類名
            method:指定調用action中的哪一個方法來去處理請求  -->
            
        <action name="LoginAction_*" class="com.Gary.web.UserAction" method="{1}">
            <!-- 默認爲轉發  redirect設置爲重定向  -->
            <result name="success" type="redirect">/index.html</result>
            <!-- 默認爲轉發 -->
            <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}">
            <!-- 轉發到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;

//第一種建立攔截器的方式
public class MyIntercept extends MethodFilterInterceptor{

    @Override
    protected String doIntercept(ActionInvocation invocation) throws Exception {
        
        System.out.println("MyIntercept");
        
        
        //獲取session
        Map<String, Object> session = ActionContext.getContext().getSession();
        //獲取session中的user
        Object object = session.get("user");
        //判斷session中是否有數據
        if(object!=null)
        {
            //有，放行
            return invocation.invoke();
        }
        else
        {
            //沒有，重定向到login.jsp
            return "toLogin";
        }
            
    }

}