struts2案例-文字过滤器

环境：idea2020 struts2 2.5

创建web

file-new moudle创建一个web项目

添加maven 选中项目-右键-add Frameworks Support

 

添加依赖

<dependencies>
        <dependency>
            <groupId>org.apache.struts</groupId>
            <artifactId>struts2-core</artifactId>
            <version>2.5.22</version>
        </dependency>
    </dependencies>

项目结构

编写代码

编写action

package com.kj.action;

import com.opensymphony.xwork2.ActionSupport;

/**
 * 类：消息控制器
 * 编写人：kujin
 * 创建时间：2020/6/20
 * 修改时间：2020/6/20
 */
public class MessageAction extends ActionSupport {

    private String title=null;
    private String content=null;

    @Override
    public String execute() throws Exception {
        return SUCCESS;
    }

    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;
    }
}

编写拦截器

package com.kj.filter;

import com.kj.action.MessageAction;
import com.opensymphony.xwork2.Action;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.AbstractInterceptor;

/**
 * 类：拦截器:文字过滤
 * 编写人：kujin
 * 创建时间：2020/6/20
 * 修改时间：2020/6/20
 */
public class MyInterceptor extends AbstractInterceptor {
    /**
     * 执行action的前后操作，动态增强Action的功能
     * @param actionInvocation
     * @return
     * @throws Exception
     */
    public String intercept(ActionInvocation actionInvocation) throws Exception {
        Object action = actionInvocation.getAction();//获取Action实例
        if (action!=null){
            //如果action 是messageAction
            if (action instanceof MessageAction){
                //类型转换
                MessageAction messageAction= (MessageAction) action;
                //获取内容
                String content=messageAction.getContent();
                //替换所有不合法的内容
                if (content.contains("傻逼")){
                    content=content.replaceAll("傻逼","**和谐有爱**");
                }
                if(content.contains("操")){
                    content=content.replaceAll("操","**草是一种植物**");
                }
                //返回编辑后的内容
                messageAction.setContent(content);
                return actionInvocation.invoke();
            }else {
                return Action.LOGIN;
            }
        }else {
            return Action.LOGIN;
        }
    }
}

编写struts.xml

创建struts.xml配置文件

 

<?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>

    <package name="User" extends="struts-default">
<!--        定义文字过滤-->
        <interceptors>
            <interceptor name="hexie" class="com.kj.filter.MyInterceptor"></interceptor>
        </interceptors>
        <action name="public" method="execute" class="com.kj.action.MessageAction">
            <result name="success">/success.jsp</result>
<!--            先进行文字过滤，在跳转页面-->
             <interceptor-ref name="defaultStack"></interceptor-ref>
            <interceptor-ref name="hexie"></interceptor-ref>
        </action>
    </package>

</struts>

利用堆栈管理多个（升级版）

<?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>

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

        <interceptors>
            <interceptor name="hexie" class="com.kj.filter.MyInterceptor"></interceptor>
            <interceptor-stack name="my_Stack">
                <!-- struts2 提供的拦截器栈,包含了struts2的很多核心拦截器,必须添加，不然获取不到参数 -->
                <interceptor-ref name="defaultStack" />
                <!--        定义文字过滤-->
                <interceptor-ref name="hexie"></interceptor-ref>
            </interceptor-stack>
        </interceptors>
        <action name="public" method="execute" class="com.kj.action.MessageAction">
            <result name="success">/success.jsp</result>
<!--            先进行文字过滤，在跳转页面-->
            <interceptor-ref name="my_Stack"></interceptor-ref>
        </action>
    </package>

</struts>

配置web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

<!--    struts2核心控制器-->
    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>
            org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter
        </filter-class>
    </filter>
    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

编写界面

index.jsp

<%@ taglib prefix="s" uri="/struts-tags" %>
<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2020/6/20
  Time: 12:49
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>$Title$</title>
  </head>
  <body>
    <s:form action="public" method="POST">
      <s:textfield name="title" label="标题"/>
      <s:textarea rows="5" cols="18" label="内容" name="content"/>
      <s:submit value="发表"/>
    </s:form>
  </body>
</html>

success.jsp

<%@ taglib prefix="s" uri="/struts-tags" %>
<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2020/6/20
  Time: 13:26
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>成功界面</title>
</head>
<body>
    标题：<s:property value="title"/>
    内容：<s:property value="content"/>
</body>
</html>

运行界面