Struts2学习笔记之入门

前提条件,在项目中有选择地导入以下struts2中的包.

xwork-2.0.5.jar

commons-logging-1.0.jar

commons-logging-api-1.1.jar

freemarker-2.3.8.jar

ognl-2.6.11.jar

struts2-core-2.0.11.2.jar

配置web.xml文件,代码如下:

 

1. <?xml version="1.0" encoding="UTF-8"?>
2. <web-app version="2.4" 
3.     xmlns="http://java.sun.com/xml/ns/j2ee" 
4.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
5.     xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
6.     http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
7.   <welcome-file-list>
8.     <welcome-file>index.jsp</welcome-file>
9.   </welcome-file-list>
10.   <filter>
11.     <filter-name>struts2</filter-name>
12.     <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class>
13.   </filter>
14.   <filter-mapping>
15.     <filter-name>struts2</filter-name>
16.     <url-pattern>/*</url-pattern>
17.   </filter-mapping>
18. </web-app>

登陆表单为例

第一步,在index.jsp中,加入以下代码,生成表单

1. <form action="LoginAction.action" method="post">
2.         username:<input type="text" name="username"/>
3.         password:<input type="password" name="password"/>
4.         <input type="submit" value="提交"/>
5. </form>

注意,若使用struts2表单标签,则无须加上".action"后缀.如:<s:form action="LoginAction" method="post">,为效率考虑,建议使用HTML标签.

 

第二步,完成LoginAction

代码如下:

1. package com.dadao.struts2;
3. import java.util.Map;
5. import javax.servlet.http.HttpServletRequest;
6. import javax.servlet.http.HttpServletResponse;
7. import javax.servlet.http.HttpSession;
9. import org.apache.struts2.interceptor.ServletRequestAware;
10. import org.apache.struts2.interceptor.ServletResponseAware;
11. import org.apache.struts2.interceptor.SessionAware;
13. import com.opensymphony.xwork2.ActionSupport;
15. public class Login extends ActionSupport implements ServletRequestAware ,ServletResponseAware,SessionAware
16. {
17.     private String message;
18.     private HttpSession session=null;
19.     private HttpServletRequest request;
20.     private HttpServletResponse response;
21.     private Map attribute;
22.     public void setServletRequest(HttpServletRequest req) {
23.         this.request=req;
24.     }
25.     public void setServletResponse(HttpServletResponse resp) {
26.         this.response=resp;
27.     }
28.     public void setSession(Map map) {
29.         this.attribute=map;
30.     }
31.     @Override
32.     public String execute() throws Exception {
33.         StringBuffer sb=new StringBuffer();
34.         sb.append("you user name is: ");
35.         sb.append(request.getParameter("username"));
36.         sb.append("you passwored is: ");
37.         sb.append(request.getParameter("password"));
38.         session=request.getSession();
39.         attribute.put("message", sb.toString());
40.         sb.append("session's message is: ");
41.         sb.append(session.getAttribute("message"));
42.         message=sb.toString();
43.         return SUCCESS;
44.     }
45.     public String getMessage() {
46.         return message;
47.     }
48.     public void setMessage(String message) {
49.         this.message = message;
50.     }
52.     
53.     
54.     
55. }

第三步,在src目录下,新建struts.xml.

代码如下:

1. <?xml version="1.0" encoding="UTF-8"?>
2. <!DOCTYPE struts PUBLIC
3.         "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
4.         "http://struts.apache.org/dtds/struts-2.0.dtd">
5. <struts>
6.     <package name="strutsPackage" extends="struts-default">
7.         <action name="LoginAction" class="com.dadao.struts2.Login">
8.             <result>/message.jsp</result>
9.         </action>
10.     </package>
11. </struts>

第四步,完成message.jsp.代码如下:

1. <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
2. <%@ taglib prefix="s" uri="/struts-tags"%>
3. <%
4. String path = request.getContextPath();
5. String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
6. %>
8. <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
9. <html>
10.   <head>
11.     <base href="<%=basePath%>">
12.     <title>My JSP 'HelloWorld.jsp' starting page</title>
13.   </head>
14.   <body> 
15.        <s:property value="message"/>
16.        <br>
17.   </body>
18. </html>

第五步,测试.