struts2_配置与信息校验

在Web中配置struts2的步骤：

在WEB-INF目录下的lib目录里加入必要的jar包
在src目录下建立struts.xml文件
配置web.xml的过滤器

struts.xml:

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 4     "http://struts.apache.org/dtds/struts-2.3.dtd">
 5     
 6     <struts>
 7         <package name="struts" extends="struts-default">
 8         
 9         
10         </package>
11     </struts>

web.xml:

 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   
 8      <filter>
 9          <filter-name>struts2</filter-name>
10          <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
11      </filter>
12   
13       <filter-mapping>
14           <filter-name>struts2</filter-name>
15           <url-pattern>/*</url-pattern>
16       </filter-mapping>
17   
18   <welcome-file-list>
19     <welcome-file>index.jsp</welcome-file>
20   </welcome-file-list>
21 </web-app>

Struts中对信息进行验证:

关键步骤:

重写自定义Action的validate()方法.
在struts中配置错误转向页面

LoginAction.java:

 1 package com.sunlfower.action;
 2 
 3 import com.opensymphony.xwork2.ActionSupport;
 4 
 5 public class LoginAction extends ActionSupport {
 6 
 7     private String username;
 8     private String password;
 9     private String repassword;
10 
11     public String getUsername() {
12         return username;
13     }
14 
15     public void setUsername(String username) {
16         this.username = username;
17     }
18 
19     public String getPassword() {
20         return password;
21     }
22 
23     public void setPassword(String password) {
24         this.password = password;
25     }
26 
27     public String getRepassword() {
28         return repassword;
29     }
30 
31     public void setRepassword(String repassword) {
32         this.repassword = repassword;
33     }
34 
35     public String execute() throws Exception {
36         return SUCCESS;
37     }
38 
39     /**
40      * 对信息进行校验的方法
41      */
42     public void validate() {
43         if (null == username || "".equals(username))
44             addActionError("用户名不能为空");
45         if (null == password || "".equals(password) || null == repassword || "".equals(repassword))
46             addActionError("密码不能为空");
47         else if (!password.equals(repassword))
48             addActionError("两次密码输入不匹配");
49     }
50 }

struts.xml:

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
 4     "http://struts.apache.org/dtds/struts-2.3.dtd">
 5 
 6 <struts>
 7     <package name="struts" extends="struts-default">
 8         <action name="loginvalidate" class="com.sunlfower.action.LoginAction">
 9             <result name="success">/welcome.jsp</result>
10             <!-- 如果输入信息的校验出错，则转回index.jsp -->
11             <result name="input">/index.jsp</result>
12         </action>
13 
14     </package>
15 </struts>

index.jsp:

 1 <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
 2 <%
 3     String path = request.getContextPath();
 4     String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/";
 5 %>
 6 
 7 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
 8 <html>
 9     <head>
10         <base href="<%=basePath%>">
11 
12         <title>My JSP 'index.jsp' starting page</title>
13         <meta http-equiv="pragma" content="no-cache">
14         <meta http-equiv="cache-control" content="no-cache">
15         <meta http-equiv="expires" content="0">
16         <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
17         <meta http-equiv="description" content="This is my page">
18         <!--
19     <link rel="stylesheet" type="text/css" href="styles.css">
20     -->
21     </head>
22 
23     <body>
24         <form action="loginvalidate.action" method="post">
25             <table align="center" border="0">
26                 <tr>
27                     <td align="right">用户名:</td>
28                     <td><input type="text" size="20" name="username"/></td>
29                 </tr>
30                 <tr>
31                     <td align="right">密码:</td>
32                     <td><input type="password" size="20" name="password"/></td>
33                 </tr>
34                 <tr>
35                     <td align="right">重新输入密码:</td>
36                     <td><input type="password" size="20" name="repassword"/></td>
37                 </tr>
38                 <tr>
39                     <td align="center" colspan="2"><input type="submit" value="提交"/></td>
40                 </tr>
41             </table>
42         </form>
43     </body>
44 </html>

welcome.jsp:

 1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 3 
 4 <%@ taglib prefix="s" uri="/struts-tags"%>
 5 
 6 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 7 <html>
 8     <head>
 9         <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
10         <title>欢迎光临</title>
11     </head>
12     <body>
13         <center>
14             <h3><font color="blue"><s:property value="username"/></font>,欢迎光临</h3><br>
15         </center>
16     </body>
17 </html>