分类：
2012-01-21 00:50:18
原文地址：全局类型转换 作者：hello_fish
全局类型转换：所有的Action里只要包含了对应的类的对象，就会执行全局的类型转换。在src目录下新建xwork-convertion.properties，该文件的内容是待转换的类=转换器的名字，即com.shengsiyuan.bean.User=com.shengsyuan.converter.UserConverter2(全局使用较少，一般尽量使用局部转换)
input.jsp
<%@ page contentType = "text/html" pageEncoding="gbk"%>
<html>
<body>
使用分号;隔开用户名和密码
<form action = "userAction.action">
user info 1:<input type = "text" name = "user"><br>
<input type = "submit" value = "submit">
form>
body>
html>
struts2.xml部分：
<action name = "userAction" class = "com.shengsiyuan.struts2.UserAction">
<result name = "SUCCESS">/output.jspresult>
action>
(Action为：UserAction.java，包含了对应类的对象【即User类中的对象user】，所以自动执行全局转换，并调用全局转换属性文件)
全局转换属性：
xwork-conversion.priperties
com.shengsiyuan.bean.User=com.shengsiyuan.converter.UserConverter2
#quanju leixingzhuanhuan.zuobian shi leiming
UserConverter2.java
package com.shengsiyuan.converter;
import java.util.Map;
import java.util.StringTokenizer;
import org.apache.struts2.util.StrutsTypeConverter;
import com.shengsiyuan.bean.User;
public class UserConverter2 extends StrutsTypeConverter
{
//StrutsTypeConverter只是将if toClass ==...else if...进行了封装
@Override
public Object convertFromString(Map context, String[] values, Class toClass)
{//fromstring,即从页面字符串转到后台
User user = new User() ;
String value = values[0] ;
StringTokenizer st = new StringTokenizer(value,";") ;
user.setUsername(st.nextToken()) ;
user.setPassword(st.nextToken()) ;
return user ;
}
@Override
public String convertToString(Map context, Object o)
{
// 后台往字符串转，即后台往页面转
User user = (User)o ;
String username = user.getUsername() ;
String password = user.getPassword() ;
String userInfo = "username:" +username+"password:"+password ;
return userInfo ;
}
}
之后调用UserAction.java，并调用其中的setUser(user)和execute()方法
UserAction.java
package com.shengsiyuan.struts2;
import com.opensymphony.xwork2.ActionSupport;
import com.shengsiyuan.bean.User;
public class UserAction extends ActionSupport
{
private User user ;
public User getUser()
{
return user;
}
public void setUser(User user)
{
this.user = user;
}
@Override
public String execute() throws Exception
{
System.out.println("username:"+user.getUsername());
System.out.println("password:"+user.getPassword());
return "SUCCESS" ;
}
}
struts.xml部分：
<action name = "userAction" class = "com.shengsiyuan.struts2.UserAction">
<result name = "SUCCESS">/output.jspresult>
action>
output.jsp
<%@ page language="java" pageEncoding="gbk"%>
<%@taglib prefix = "s" uri = "/struts-tags" %>
<html>
<body>
<s:property value = "user"/>
body>
html>
