第二篇——Struts2的Action搜索顺序

时间：2021-08-08 05:14:06

Struts2的Action的搜索顺序：

地址：http://localhost:8080/path1/path2/student.action

    1、判断package是否存在，例如：/path1/path2；

    2、若存在，判断action是否存在，没有则报错；

    3、不存在，检查上一级路径的package是否存在（知道默认的namespace），重复第一步，没有则报错。


项目实例：

1、项目结构

第二篇——Struts2的Action搜索顺序

2、pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.ray</groupId>
  <artifactId>struts2Test</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>
  <name>struts2Test Maven Webapp</name>
  <url>http://maven.apache.org</url>

  <dependencies>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.apache.struts/struts2-core -->
    <dependency>
      <groupId>org.apache.struts</groupId>
      <artifactId>struts2-core</artifactId>
      <version>2.5.16</version>
    </dependency>

  </dependencies>

  <build>
    <finalName>struts2Test</finalName>
  </build>

</project>

3、web.xml

<web-app xmlns="http://java.sun.com/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
                      http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         version="3.0" metadata-complete="true">
  <display-name>Archetype Created Web Application</display-name>

  <!-- 过滤所有请求交给Struts2处理 -->
  <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>

4、SearchAction.java

package com.ray.action;

import com.opensymphony.xwork2.ActionSupport;

/**
 * Created by Ray on 2018/3/26 0026.
 * 第二篇实例
 **/
public class SearchAction extends ActionSupport{

    public String search(){
        return SUCCESS;
    }
}

5、second-struts.xml

<?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="search1" extends="struts-default" namespace="/">

        <action name="search" class="com.ray.action.SearchAction" method="search">
            <result>/search.jsp</result>
        </action>

        <action name="CommonSearch" class="com.ray.action.SearchAction" method="search">
            <result>/Common.jsp</result>
        </action>

    </package>

    <package name="search2" extends="struts-default" namespace="/aa">

        <action name="CommonSearch" class="com.ray.action.SearchAction" method="search">
            <result>/aaCommon.jsp</result>
        </action>

    </package>
</struts>

6、struts.xml

include引入 > 后面会讲解

<?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="default" namespace="/" extends="struts-default">

        <action name="helloWorld" class="com.ray.action.HelloWorldAction">
            <result name="success">/success.jsp</result>
        </action>
    </package>

    <include file="second-struts.xml"/>
</struts>

7、aaCommon.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>This is aaCommon.jsp</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

</head>

<body>
    This is aaCommon.jsp
</body>
</html>

8、search.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>This is search.jsp</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

</head>

<body>
    This is search.jsp
</body>
</html>

9、Common.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8" %>
<%
    String path = request.getContextPath();
    String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>This is Common.jsp</title>

    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

</head>

<body>
    This is Common.jsp
</body>
</html>

10、页面效果

访问一：http://localhost:8080/struts2Test/aa/CommonSearch.action

此时存在namespace="/aa"的package，搜索action，存在

第二篇——Struts2的Action搜索顺序

访问二：http://localhost:8080/struts2Test/aa/search.action

此时存在namespace="/aa"的package，搜索action，不存在，报错

第二篇——Struts2的Action搜索顺序

访问三：http://localhost:8080/struts2Test/aa/bb/CommonSearch.action

此时不存在namespace="/aa/bb"的package，搜索上一级路径的package，此时存在namespace="/aa"的package，搜索action，存在

第二篇——Struts2的Action搜索顺序

访问四：http://localhost:8080/struts2Test/CommonSearch.action

存在namespace="/"的package，搜索action，存在

第二篇——Struts2的Action搜索顺序

访问五：http://localhost:8080/struts2Test/search.action

存在namespace="/"的package，搜索action，存在

第二篇——Struts2的Action搜索顺序

ok！

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