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SSH-Struts第一弹:ActionSupport类

Action继承了com.opensymphony.xwork2.ActionSupport。

1  package com.candy.login;
2  import com.opensymphony.xwork2.ActionSupport;
3  public class LoginAction extends ActionSupport {}

继承了ActionSupport后,可以在execute()里加入以下验证信息:

 

1  addActionError(""); // Action错误提示
2  addFieldError("", ""); // 字段错误提示
3  addActionMessage(""); // 错误消息

就目前继承ActionSupport的作用有两个:
1、addActionError("")/addFieldError("","")/addActionMessage("")三个方法都是从这个类继承的,可以在自己的Action中使用。
2、我找到的ActionSupport的五个静态常量,也可以在自己的Action中的使用。同时,在struts.xml中<result>/main.jsp</result>和<result name="success">/main.jsp</result>的功能是一致的。

1 public static final java.lang.String SUCCESS = "success";
2 public static final java.lang.String NONE = "none";
3 public static final java.lang.String ERROR = "error";
4 public static final java.lang.String INPUT = "input";
5 public static final java.lang.String LOGIN = "login";

同时,发下web.xml和struts.xml

web.xml:

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
 3     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 4     xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
 5     <display-name>Struts</display-name>
 6     <filter>
 7         <filter-name>struts2</filter-name>
 8         <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
 9     </filter>
10     <filter-mapping>
11         <filter-name>struts2</filter-name>
12         <url-pattern>/*</url-pattern>
13     </filter-mapping>
14     <welcome-file-list>
15         <welcome-file>index.jsp</welcome-file>
16     </welcome-file-list>
17 </web-app>

struts.xml:

 1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" "http://struts.apache.org/dtds/struts-2.3.dtd">
 3 <!-- <?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache 
 4     Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> -->
 5 <struts>
 6     <constant name="struts.i18n.encoding" value="UTF-8"></constant>
 7     <package name="struts2" extends="struts-default" namespace="/">
 8         <global-results>
 9             <result name="errorPath" type="redirect">
10                 /errorPage.jsp
11             </result>
12         </global-results>
13         <action name="LoginAction" class="com.candy.login.LoginAction">
14             <result name="error">index.jsp</result>
15             <result>/WEB-INF/main.jsp</result>
16         </action>
17     </package>
18 
19     <!-- 引用其他模块的Struts.xml配置文件 -->
20     <!-- <include file="testStruts.xml"/> -->
21 
22     <!-- Apache Struts2官方网站 -->
23     <!-- http://struts.apache.org/release/2.0.x/ -->
24 </struts>
posted @ 2014-03-16 23:20  Candyメ奶糖  阅读(457)  评论(2编辑  收藏  举报