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类型转换

程序员文章站 2024-03-18 20:49:58
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类型转换:
步骤：
1． Input.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>坐标请用逗号分隔</h1>
	<form action="converterAction.action" method="post">
		坐标：<input type="text" name="point" size="20"/><br>
		用户名:<input type="text" name="username" size="20" /><br>
		年龄：<input type="text" name="age" size="20" /><br>
		生日：<input type="text" name="birthday" size="20" /><br>

		<input type="submit" value="提交"/>
	</form>
</body>
</html>

2． 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="helloworld" class="com.test.action.HelloWorld">
			<result>/helloworld.jsp</result>
		</action>

		<action name="login" class="com.test.action.LoginAction">
			<result>/result.jsp</result>
		</action>

		<action name="converterAction" class="com.test.action.PointAction">
			<result name="success">/output.jsp</result>
			<result name="input">/error.jsp</result>
		</action>

	</package>
</struts>

3． Output.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
	坐标：<s:property value="point"/><br>
	用户名:<s:property value="username"/><br>
	年龄：<s:property value="age"/><br>
	生日：<s:property value="birthday" /><br>
</body>
</html>

4． PointAction类

package com.test.action;

import java.util.Date;

import com.opensymphony.xwork2.ActionSupport;
import com.test.bean.Point;

public class PointAction extends ActionSupport{

	private Point point;
	private String username;
	private int age;
	private Date birthday;

	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public Date getBirthday() {
		return birthday;
	}
	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}
	public Point getPoint() {
		return point;
	}
	public void setPoint(Point point) {
		this.point = point;
	}

	public String execute() throws Exception{
		return "success";
	}
}

5． Point类

package com.test.bean;

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;
	}

}

6． 在com.test.action包下创建PointAction.conversion.properties文件

point=com.test.converter.PointCoverter

7． PointConverter类

package com.test.converter;

import java.util.Map;

import ognl.DefaultTypeConverter;

import com.test.bean.Point;

public class PointCoverter extends DefaultTypeConverter {

	@SuppressWarnings("unchecked")
	@Override
	public Object convertValue(Map context, Object value, Class toType) {

		if(Point.class==toType){
			String[] str=(String[])value;
			String firstValue=str[0];
			String[] result=firstValue.split(",");
			Point point=new Point();
			point.setX(Integer.parseInt(result[0]));
			point.setY(Integer.parseInt(result[1]));

			return point;
		}else if(String.class==toType){
			Point point=(Point)value;
			int x=point.getX();
			int y=point.getY();

			return "x:"+x+",y:"+y;
		}

		return null;
	}
}

类型转换(继承StrutsTypeConverter):
PointCoverter类如下，其它一样

package com.test.converter;

import java.util.Map;

import org.apache.struts2.util.StrutsTypeConverter;

import com.test.bean.Point;

public class PointCoverter1 extends StrutsTypeConverter {

	@Override
	public Object convertFromString(Map context, String[] values, Class toClass) {
		String firstValue=values[0];
		String[] result=firstValue.split(",");
		Point point=new Point();
		point.setX(Integer.parseInt(result[0]));
		point.setY(Integer.parseInt(result[1]));

		return point;

	}

	@Override
	public String convertToString(Map context, Object o) {
		Point point=(Point)o;
		int x=point.getX();
		int y=point.getY();

		return "x:"+x+",y="+y;
	}

}



类型转换(批量转换):
1. Input.jsp：

坐标：<input type="text" name="point" size="20"/><br>
		坐标1：<input type="text" name="point" size="20"/><br>
		坐标2：<input type="text" name="point" size="20"/><br>

2. Output.jsp：

坐标：<s:property value="point"/><br>

3. 主要是PointAction类:

private List<Point> point;

4. PointAction-conversion.properties文件

#point=com.test.converter.PointCoverter1
#point1=com.test.converter.PointCoverter1
point=com.test.converter.PointCoverter2

5. PointCoverter2ç±»

package com.test.converter;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.struts2.util.StrutsTypeConverter;

import com.test.bean.Point;

public class PointCoverter2 extends StrutsTypeConverter {

	@Override
	public Object convertFromString(Map context, String[] values, Class toClass) {

		List<Point> list=new ArrayList<Point>();

		for(String str : values){
			String[] result=str.split(",");
			Point point=new Point();
			point.setX(Integer.parseInt(result[0]));
			point.setY(Integer.parseInt(result[1]));

			list.add(point);
		}

		return list;
	}

	@Override
	public String convertToString(Map context, Object o) {
		List<Point> list=(List<Point>)o;

		StringBuffer buf=new StringBuffer();

		int number=0;

		for(Point point : list){
			number++;
			int x=point.getX();
			int y=point.getY();

			buf.append(number).append(". x=").append(x).append(",y=").append(y).append("\n");
		}

		return buf.toString();
	}

}

类型转换(对象属性方式):
1. input.jsp

x：<input type="text" name="point.x" size="20"/><br>
	y：<input type="text" name="point.y" size="20"/><br>

2. output.jsp

坐标：<s:property value="point"/><br>

3. PointAction-conversion.properties文件

#point=com.test.converter.PointCoverter1
#point1=com.test.converter.PointCoverter1
#point=com.test.converter.PointCoverter2

4. PointActionç±»:

private Point point;

5. Point类重写toStirng

@Override
	public String toString() {
		String str="x="+x+",y="+y;

		return str;
}

类型转换(全局):
1. 在src下建立xwork-conversion.properties(固定)文件

com.test.bean.Point=com.test.converter.PointCoverter1

2. PointAction-conversion.properties文件

#point=com.test.converter.PointCoverter1
#point1=com.test.converter.PointCoverter1
#point=com.test.converter.PointCoverter2

3. Input.jsp中坐标：

<input type="text" name="point" size="20"/><br>

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