Struts2.0学习---第一个程序

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刚开始接触框架，怀着崇敬的心情去学习Struts2.0，然后就被其强大的功能，简洁的代码所吸引，然而一开始还是碰了不少壁，有很多细节需要掌握，不然要一直和bug打交道了。

我这个是Struts2.0框架，2.0以上的版本不保证可以正常运行。

导包的话，直接导入样例中最小的包的lib。

先在src下建个包action，里面一个继承ActionSupport类的ShowWords类。

package action;import com.opensymphony.xwork2.ActionSupport;public class ShowWords extends ActionSupport {private String name;private String words;@Overridepublic String execute() throws Exception {if("".equals(name)){return INPUT;}else{words="welcome"+name;return SUCCESS;}}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getWords() {return words;}public void setWords(String words) {this.words = words;}}

web.xml配置过滤器

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5" 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_2_5.xsd">  <filter><filter-name>struts2.0</filter-name><filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class></filter>      <filter-mapping>         <filter-name>struts2.0</filter-name>         <url-pattern>/*</url-pattern>    </filter-mapping>    <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list></web-app>

structs.xml直接从最小的样例copy，中间做一些改变

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"    "http://struts.apache.org/dtds/struts-2.0.dtd"><struts><constant name="struts.il8n.encoding"  value="UTF-8"/><package name="default" extends="struts-default"><action name="showWords"  class="action.ShowWords"><result name="success">/showWords.jsp</result><result name="input">/inputWords.jsp</result></action></package></struts>

showWords.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <title>My JSP 'showWords.jsp' starting page</title>  </head>    <body>   ${words }  </body></html>

inputWords.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <title>My JSP 'inputWords.jsp' starting page</title>  </head>    <body>    <form action="showWords.action"  method="post">    您的昵称：<input type="text"  name="name"/>    <input type="submit"  name="提交"/>    </form>  </body></html>

其中struts.xml中配置的name属性showWords，即是form表单action的属性。

程序运行流程
先访问inputWords.jsp输入昵称，然后点击提交给struts.xml，struts.xml将加载class “action.ShowWords” 返回success，然后便调用showWords.jsp，显示信息。

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