Strut2------配置环境

1.导入必要的包

2.在src目录下新建struts.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
    <!-- 修改后缀 -->
    <constant name="struts.action.extension" value="do,,"/>

    <!-- 注意：后面include进来的xml是无效的 -->
    <include file="servlet.xml"/>

</struts>

3.在src目录下新建servlet.xml文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
    <package name="other" namespace="/" extends="struts-default">

        <action name="servlet2" class="context.ServletActionDemo2">
            <result name="success" type="redirect">/index.jsp</result>
        </action>

    </package>

    <package name="default" namespace="/" extends="struts-default">
        <!-- 没有定义<result>的<action>使用这个 -->
        <global-results>
            <result name="none" type="dispatcher">/index.jsp</result>
        </global-results>

        <!-- 局部结果界面  -->
        <action name="servlet" class="context.ServletActionDemo">
            <result name="success">/index.jsp</result>
        </action>

        <!-- <action name="servlet2" class="context.ServletActionDemo2">

        </action> -->

        <action name="servlet3" class="context.ServletActionDemo3">

        </action>

        <action name="servlet3" class="context.ServletActionDemo3">
        <!-- type的默认值是dispatcher：请求转发，redirect：重定向，url地址显示的是界面地址 -->
        <!-- type="chain"时是action跳转action，而且跳转的action需要写在另一个package里面,如servlet2 -->
            <result name="none" type="chain">servlet2</result>
        </action>
        
　　　　 <!-- 这里只测试了这个action，其余的没有测 -->
        <action name="login" class="context.LoginAction">
            <result name="success" type="dispatcher">/index.jsp</result>
        </action>
        <action name="login2" class="context.LoginAction2">
            <result name="success" type="redirect">/index.jsp</result>
        </action>
    </package>

</struts>

4.配置web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>MyFirst</display-name>

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

    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
</web-app>

5.在src目录下新建context包，里面新建类文件LoginAction.java(其他的没有一一列出来喔)

public class LoginAction extends ActionSupport{
    @Override
    public String execute(){
        //HttpServletRequest request = ServletActionContext.getRequest();
        return SUCCESS;
    }
}

6.新建index.jsp文件

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>主界面</title>
  </head>

  <body>
    <a href="${pageContext.request.contextPath}/login">跳转login  Servlet</a>
    <h1>${pageContext.request.contextPath}</h1>
  </body>
</html>