spring属性编辑器

       Spring的属性编辑器和传统的用于IDE开发时的属性编辑器不同，它们没有UI界面，仅负责将配置文件中的配置值转换为Bean属性类型的对应值，相当于把spring配置文件中的字符串转换成相应的对象进行注入。spring已经有内置的属性编辑器，我们可以根据需求自己定义属性编辑器。

       1、   首先我们要继承 java.beans.PropertyEditorSupport类，重写setAsText()方法，如：

package com.yx.spring.bean;

import java.beans.PropertyEditorSupport;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class DatePropertyEditor extends PropertyEditorSupport {
	private String format="yyyy-MM-dd";
	
	@Override
	public void setAsText(String text) throws IllegalArgumentException {
		System.out.println("自定义编辑器" + text);
		
		SimpleDateFormat sdf = new SimpleDateFormat(format);
		try {
			Date d = sdf.parse(text);
			this.setValue(d);//调用setValue(Object)来完成属性对象设置操作。
		} catch (ParseException e) {
			e.printStackTrace();
		}
	}

	public void setFormat(String format) {
		this.format = format;
	}

}

 

2、将属性编辑器注册到spring中

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd">

	<!-- 定义属性编辑器 -->
	<bean id="customEditorConfigurer"
		class="org.springframework.beans.factory.config.CustomEditorConfigurer">
		<property name="customEditors">
			<map>
				<entry key="java.util.Date"><!-- 属性类型 -->
					<bean
						class="com.yx.spring.bean.DatePropertyEditor"><!--对应的编辑器 -->
						<property name="format" value="yyyy-MM-dd" />
					</bean>
				</entry>
			</map>
		</property>
	</bean>
	<bean id="bean" class="com.yx.spring.bean.BeanEdit">
		<property name="date">
			<value>2008-8-8</value>
		</property>
	</bean>
</beans>

 3、bean

package com.yx.spring.bean;

import java.util.Date;

public class BeanEdit {
	
	private Date date;

	public Date getDate() {
		return date;
	}

	public void setDate(Date date) {
		this.date = date;
	}

}

 

 

4、测试

package com.yx.spring.test;

import junit.framework.TestCase;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import com.yx.spring.bean.BeanEdit;

public class SpringTest extends TestCase {

private BeanFactory factory;
	
	
	protected void setUp() throws Exception {
		factory = new ClassPathXmlApplicationContext("applicationContext-edit.xml");	
	}

	public void testEdit() {
		BeanEdit beanEdit= (BeanEdit)factory.getBean("bean");
		
		System.out.println("bean.dateValue=" + beanEdit.getDate());
	
	}
	
	
}