struts2_自定义对象设置

在struts2里面对八种基本数据类型和Date类型有自动的转换功能，也可以自定义类型转换.

主要步骤如下：

编写自定义类型的类(JavaBean).
编写自定义类型转换器(继承StrutsTypeConverter类或者DefaultTypeConverter类)
编写Action(继承ActionSupport类)
在Action的同一目录下建立ActionName-conversion.properties(ActionName是Action的类名，conversion.properties是固定后缀)

结构：

用登陆功能来分析:

JavaBean:User.java

 1 package com.sunflower.bean;
 2 
 3 public class User {
 4     private String username;
 5     private String password;
 6 
 7     public String getUsername() {
 8         return username;
 9     }
10 
11     public void setUsername(String username) {
12         this.username = username;
13     }
14 
15     public String getPassword() {
16         return password;
17     }
18 
19     public void setPassword(String password) {
20         this.password = password;
21     }
22 
23 }

类型转换器:UserConvert.java

 1 package com.sunflower.util;
 2 
 3 import java.util.Map;
 4 
 5 import org.apache.struts2.util.StrutsTypeConverter;
 6 
 7 import com.sunflower.bean.User;
 8 
 9 /**
10  * 自定义类型转换类
11  * 
12  * @author hanyuan
13  * @time 2012-6-2 下午06:12:13
14  */
15 public class UserConvert extends StrutsTypeConverter {
16 
17     /**
18      * 将前台字符类型数据转换为自定义类型
19      */
20     public Object convertFromString(Map arg0, String[] arg1, Class arg2) {
21 
22         String userinfo = arg1[0];
23         String username = userinfo.split(":")[0];
24         String password = userinfo.split(":")[1];
25 
26         User user = new User();
27         user.setUsername(username);
28         user.setPassword(password);
29 
30         return user;
31     }
32 
33     /**
34      * 将后台自定义类型数据转换为前台字符类型
35      */
36     public String convertToString(Map arg0, Object arg1) {
37         User user = (User) arg1;
38 
39         String userinfo = "";
40         if (user.getUsername().equals("yuan") && user.getPassword().equals("123"))
41             userinfo = user.getUsername();
42         else
43             userinfo = "username:" + user.getUsername() + " password:" + user.getPassword();
44         return userinfo;
45     }
46 
47 }

Action:LoginAction.java

 1 package com.sunflower.action;
 2 
 3 import com.opensymphony.xwork2.Action;
 4 import com.opensymphony.xwork2.ActionSupport;
 5 import com.sunflower.bean.User;
 6 
 7 /**
 8  * 校验用户信息的Action
 9  * 
10  * @author hanyuan
11  * @time 2012-6-2 下午05:08:54
12  */
13 public class LoginAction extends ActionSupport {
14 
15     private User user;
16 
17     public User getUser() {
18         return user;
19     }
20 
21     public void setUser(User user) {
22         this.user = user;
23     }
24 
25     public String execute() throws Exception {
26         // 判断用户名和密码是否正确
27         if (user.getUsername().equals("yuan") && user.getPassword().equals("123"))
28             return Action.SUCCESS;
29         else
30             return Action.ERROR;
31     }
32 }

Properties:LoginAction-conversion.properties

user是要对其进行转换的数据对象，com.sunflower.util.UserConvert是对应的类型转换器

struts.xml中的配置:

 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="struts2" extends="struts-default">
 8         <action name="logintest" class="com.sunflower.action.LoginAction">
 9             <result name="success">/login.jsp</result>
10             <result name="error">/failed.jsp</result>
11         </action>
12     </package>
13 
14 </struts>