struts2初试 -- Hello world-优快云博客

一.环境准备

struts-2.3.4.1-all ：下载地址：http://struts.apache.org/download.cgi#struts2341

二.工程配置

1. Eclipse：File-New-Dynamic Web project，新建一个工程【strutsDemo】

2. 将struts-2.3.4.1-all 解压，里面的lib文件夹中的以下jar文件

antlr-2.7.2.jar

aopalliance-1.0.jar

asm-3.3.jar

commons-beanutils-1.8.0.jar

commons-chain-1.2.jar

commons-collections-3.1.jar

commons-digester-2.0.jar

commons-fileupload-1.2.2.jar

commons-io-2.0.1.jar

commons-lang-2.4.jar

commons-lang3-3.1.jar

commons-logging-1.1.1.jar

commons-logging-api-1.1.jar

commons-validator-1.3.1.jar

freemarker-2.3.19.jar

javassist-3.11.0.GA.jar

ognl-3.0.5.jar

struts2-core-2.3.4.1.jar

xstream-1.4.2.jar

xwork-core-2.3.4.1.jar

copy进刚刚创建的工程的WebContent\WEB-INF\lib里面，

之后在eclipse中右键该工程选择build Path，

在弹出窗口中选择第3选项卡libraries，

点击右侧的【Add Library】在弹出窗口中选择Web App libraries，将其引入。

三.struts2配置

1.struts2与struts1不同，使用filter作为整个框架的入口。在web.xml中加入以下语句

	<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>

2.之后配置struts2自己的配置文件struts.xml,类似于struts1的struts-config.xml文件，不过因为加载方式的不同，这个文件存在于classpath中，即工程的src文件夹下。

<?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>

  <constant name="struts.devMode" value="true" />

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

  <action name="index">
    <result>/index.jsp</result>
  </action>
		
  <action name="hello" class="struts2.example.action.HelloWorldAction" method="execute">
    <result name="success">/HelloWorld.jsp</result>
  </action>

</package>

</struts>

3.在src中加入在配置中指定的类文件HelloWorldAction

package struts2.example.action;

import struts2.example.model.MessageStore;

import com.opensymphony.xwork2.ActionSupport;

public class HelloWorldAction extends ActionSupport {

	/**
	 * 
	 */
	private static final long serialVersionUID = -1407265450788291203L;
	
	private MessageStore messageStore;
	
	public String execute() throws Exception {
		
		messageStore = new MessageStore() ;
		return SUCCESS;
	}

	public MessageStore getMessageStore() {
		return messageStore;
	}

	public void setMessageStore(MessageStore messageStore) {
		this.messageStore = messageStore;
	}

}

以及MessageStore

package struts2.example.model;

public class MessageStore {
	
	private String message;
	
	public MessageStore() {
		
		setMessage("Hello Struts User");
	}

	public String getMessage() {

		return message;
	}

	public void setMessage(String message) {

		this.message = message;
	}
}

4.添加jsp文件

index.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"

    pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!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>Basic Struts 2 Application - Welcome</title>
</head>
<body>
<h1>Welcome To Struts 2!</h1>
<p><a href="<s:url action='hello'/>">Hello World</a></p>
</body>
</html>

Helloworld.jsp

    pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>
<!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>Hello World!</title>
</head>
<body>
    <h2><s:property value="messageStore.message" /></h2>
</body>
</html>