struts demo —— struts的运转核心

struts

struts 的第一个 demo，核心：filter。

请求通过过滤器进入org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter，再找到配置文件struts.xml，根据action的名称进入不同的action，这里请求进入com.demo.UserAction，再根据UserAction返回的结果进行跳转。

web.xml:

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<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
    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">

  <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>

struts.xml（该文件需手动在 src 目录下创建）

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<?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="any" extends="struts-default" namespace="/">   
		<action name="logindo" class="com.demo.UserAction" method="execute">   
			<result name="success">success.jsp</result>  
			<result name="fail">fail.jsp</result>   
		</action>  
	</package>  
</struts>

index.jsp:

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<%@ 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>My JSP 'index.jsp' starting page</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>
  	<form action="logindo" method="get">
	    帐号：<input type="text" name="username"/>
	    </br>
	   密码： <input type="password" name="password"/>
	    <input type="submit" />
  	</form>
  </body>
</html>

UserAction.java

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package com.demo;

public class UserAction {
	
	private String username;
	private String password;
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	
	public String execute() throws Exception{
		if(this.getUsername().trim().equals("123") && this.getPassword().trim().equals("123")){
			return "success";
		}else{
			return "fail";
		}
	}

}

还有 success.jsp 和 fail.jsp。