Struts2自定义拦截器——完整实例代码

时间：2021-02-17 05:31:05

比如一个网上论坛过滤系统，将网友发表的不文明、不和谐的语言，通过拦截器对这些文字进行自动替代。

该项目包含：

1、自定义拦截器(MyInterceptor.java)

2、发表评论的页面(news.jsp)

3、对应的业务控制器(PublicAction.java)

4、业务控制器控制其跳转到success.jsp

代码如下：

1、自定义拦截器(MyInterceptor.java)

package interceptor;

import com.opensymphony.xwork2.Action;

import com.opensymphony.xwork2.ActionInvocation;

import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

public class MyInterceptor extends AbstractInterceptor{

    public String intercept(ActionInvocation ai) throws Exception {

        //获取Action的实例

        Object object = ai.getAction();

        if(object!=null){

            if(object instanceof PublicAction){

                PublicAction ac=(PublicAction)object;

                //获取用户提交的评论内容

                String content=ac.getContent();

                //判断用户提交的评论内容是否有要过滤的内容

                if(content.contains("讨厌")){

                    //以“喜欢”代替要过滤的“讨厌”

                    content = content.replaceAll("讨厌","喜欢");

                    //把替代后的评论内容设置为Action的评论内容

                    ac.setContent(content);

                }

                //对象不空，继续执行

                return ai.invoke();

            }else{

                //返回Action中的LOGIN逻辑视图字符串

                return Action.LOGIN;

            }

        }

        return Action.LOGIN;

    }

}

2、发表评论的页面(news.jsp)

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"

    pageEncoding="utf-8"%>

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

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>Insert title here</title>

</head>

<body>

    请发表你的评论：

    <hr>

    <s:form action="public" method="post">

        <s:textfield name="title" label="评论标题" maxLength="" />

        <s:textarea name="content" rows="" cols="" label="评论内容" />

        <s:submit value="提交" />

    </s:form>

</body>

</html>

3、对应的业务控制器(PublicAction.java)

package interceptor;

import com.opensymphony.xwork2.ActionSupport;

public class PublicAction extends ActionSupport{

    private String title;

    private String content;

    public String getTitle() {

        return title;

    }

    public void setTitle(String title) {

        this.title = title;

    }

    public String getContent() {

        return content;

    }

    public void setContent(String content) {

        this.content = content;

    }

    public String execute() throws Exception{

        return "success";

    }

}

4、业务控制器控制其跳转到success.jsp

<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"

    pageEncoding="utf-8"%>

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

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>Insert title here</title>

</head>

<body>

    评论如下：

    <hr>

    评论标题：<s:property value="title" />

    <br>

    评论内容：<s:property value="content" />

</body>

</html>

5、struts.xml

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

<!DOCTYPE struts PUBLIC

    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"

    "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>

    <package name="intercept" extends="struts-default">

        <interceptors>

            <interceptor name="replace" class="interceptor.MyInterceptor" ></interceptor>

        </interceptors>

        <action name="public" class="interceptor.PublicAction">

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

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

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

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

        </action>

    </package>

</struts>

6、web.xml

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

<web-app  version="2.4"

    xmlns="http://java.sun.com/xml/ns/j2ee"

    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee

    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">  

    <filter>

        <!-- 配置Struts2核心Filter的名字 -->

        <filter-name>struts2</filter-name>

        <!-- 配置Struts2核心Filter的实现类 -->

        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>

    </filter>

    <!-- 配置Filter拦截的URL -->

    <filter-mapping>

        <!-- 配置Struts2的核心FilterDispatcher拦截所有用户请求 -->

        <filter-name>struts2</filter-name>

        <url-pattern>/*</url-pattern>

    </filter-mapping>  

  <welcome-file-list>

    <welcome-file>index.jsp</welcome-file>

  </welcome-file-list>

</web-app>

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