1.创建一个web项目.
2.在web-inf文件夹下创建web.xml
web.xml代码如下:
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>ex1</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.jsp</welcome-file>
</welcome-file-list>
</web-app>
3.在src文件下创建struts.xml
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="default" namespace="/" extends="struts-default">
<action name="hello" class="com.MyAction">
<result name="success">
/hello.jsp
</result>
</action>
</package>
</struts>
4.在src文件创建com包,创建MyAction类
MyAction类继承Actionsupport
package com;
import com.opensymphony.xwork2.ActionSupport;
public class MyAction extends ActionSupport{
/**
*
*/
private static final long serialVersionUID = 1L;
public String execute() throws Exception{
return "success"; //返回常量success
}
}
5.接下来就在web-content文件下创建index.jsp和hello.jsp
index.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib uri="/struts-tags" prefix="s"%>
<!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>
<a href="hello.action">跳转到hello</a>
</body>
</html>
这样,简单的struts2框架就搭建完成了.
1.当运行index.jsp时,发现了hello的action的用户请求
2.Sturts 2框架的主控器(FilterDispatcher)接受用户请求,然后判断这个请求交给action处理还是web组件处理,如果请求的action或者web组件都不存在,就会出现404。
3.第二步判断的结果是交给Action处理,并且存在对应的action,那么根据struts.xml文件中对此action的配置信息,首先执行拦截此action的所有拦截器,然后在执行请求的action对象..
4.action执行完毕之后返回一个结果,用字符串表示。返回主控器,主控器根据此返回结果从配置文件中找到真正的路径。