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struts2类型转换实现1（通过继承DefaultTypeConverter抽象类）

struts2DefaultTypeConverter 
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一.第一种struts2类型转换方式实例
1.convert.jsp 
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>类型转换</title>
  </head>
  <body>
    <form action="convert.action" method="post">
    	point1:<input name="point" type="text"></br>
    	point2:<input name="point2" type="text"></br>
               <input type="submit" value="submit">
    </form>
  </body>
</html>

2.convertResult.jsp 
<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>类型转换结果页面</title>
  </head>
  <body>
    	point1:<s:property value="point"/><br>
  	point2:<s:property value="point2"/>
  </body>
</html>

3.Point.java(POJO类) 
package com.hitsoft.model;
public class Point {
	private int x;
	private int y;
	public int getX() {
		return x;
	}
	public void setX(int x) {
		this.x = x;
	}
	public int getY() {
		return y;
	}
	public void setY(int y) {
		this.y = y;
	}
	@Override
	public String toString() {
		String result = "x = " + x + " , y = " +y;
		return result;
	}
	
}


4.struts.xml 
<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
    <package name="struts2"  extends="struts-default">
	<action name="convert" class="com.hitsoft.action.ConvertAction">
		<result name="success">/convertResult.jsp</result>
	</action>
    </package>
</struts>

5.ConvertAction.java 
package com.hitsoft.action;
import java.util.Date;
import com.hitsoft.model.Point;
import com.opensymphony.xwork2.ActionSupport;

public class ConvertAction extends ActionSupport{
	private Point point;
	private Point point2;
		
	public Point getPoint() {
		return point;
	}
	public void setPoint(Point point) {
		this.point = point;
	}
	
	public Point getPoint2() {
		return point2;
	}
	public void setPoint2(Point point2) {
		this.point2 = point2;
	}
	public String execute() throws Exception{
		return "success";
	}
}

6.ConvertAction-conversion.properties(必须与ConvertAction类在同一级包下定义) 
point=com.hitsoft.convert.PointConverter
point2=com.hitsoft.convert.Point2Converter

7.PointConverter.java 
package com.hitsoft.convert;
import java.util.Map;
import com.hitsoft.model.Point;
import ognl.DefaultTypeConverter;
public class PointConverter extends DefaultTypeConverter{

	@Override
	public Object convertValue(Map context, Object value, Class toType) {
		if(Point.class == toType){
			String[] str = (String[])value;
			String firstValue = str[0];
			String[] resultValue = firstValue.split(",");
			Point point = new Point();
			point.setX(Integer.parseInt(resultValue[0]));
			point.setY(Integer.parseInt(resultValue[1]));
			return point;
		}else if(String.class == toType){
			Point point = (Point)value;
			int x = point.getX();
			int y = point.getY();
			String result = "x: " + x + "y:" + y;
			return result;
		}
		return null;
	}
}


8.Point2Converter.java 
package com.hitsoft.convert;
import java.util.Map;
import com.hitsoft.model.Point;
import ognl.DefaultTypeConverter;
public class Point2Converter extends DefaultTypeConverter{

	@Override
	public Object convertValue(Map context, Object value, Class toType) {
		if(Point.class == toType){
			String[] str = (String[])value;
			String firstValue = str[0];
			String[] resultValue = firstValue.split(",");
			Point point = new Point();
			point.setX(Integer.parseInt(resultValue[0]));
			point.setY(Integer.parseInt(resultValue[1]));
			return point;
		}else if(String.class == toType){
			Point point = (Point)value;
			int x = point.getX();
			int y = point.getY();
			String result = "x: " + x + "y:" + y;
			return result;
		}
		return null;
	}
}

9.访问地址：
http://localhost:8080/struts2/convert.jsp
输入：
1,2
3,4
输出：
point1:1,2
point2:3,4

说明：这种类型转换不能代码复用，有多个对象转换时就需要编写多个转换器。
分享到：
| MVC设计模式简介
评论
1 楼 soulaxin 2012-03-09  
结果咋是这样的倪？
point1:1,2 
point2:3,4


都没有执行这个判断
        
}else if(String.class == toType){  
            Point point = (Point)value;  
            int x = point.getX();  
            int y = point.getY();  
            String result = "x: " + x + "y:" + y;  
            return result;  
        }


或者是调用Point类的toString方法~
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