Spring自定义属性编辑器

什么是属性编辑器，作用？

* 自定义属性编辑器，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

* 如何定义属性编辑器？

* 继承PropertyEditorSupport类，覆写setAsText()方法，参见：UtilDatePropertyEditor.java

* 将属性编辑器注册到spring中，参见：applicationContext-editor.xml

package com.bjsxt.spring;

import java.beans.PropertyEditorSupport;

import java.text.ParseException;

import java.text.SimpleDateFormat;

import java.util.Date;

/**

* java.util.Date属性编辑器

* @author Administrator

*

*/

public class UtilDatePropertyEditor extends PropertyEditorSupport {

private String format="yyyy-MM-dd";

@Override

public void setAsText(String text) throws IllegalArgumentException {

System.out.println("UtilDatePropertyEditor.saveAsText() -- text=" + text);

SimpleDateFormat sdf = new SimpleDateFormat(format);

try {

Date d = sdf.parse(text);

this.setValue(d);

} catch (ParseException e) {

e.printStackTrace();

}

}

public void setFormat(String format) {

this.format = format;

}

}

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

<beans xmlns="http://www.springframework.org/schema/beans"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:aop="http://www.springframework.org/schema/aop"

xmlns:tx="http://www.springframework.org/schema/tx"

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-2.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-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">

<bean class="com.bjsxt.spring.UtilDatePropertyEditor">

<property name="format" value="yyyy-MM-dd"/>

</bean>

</entry>

</map>

</property>

</bean>

<!--

<bean id="utilDatePropertyEditor" class="com.bjsxt.spring.UtilDatePropertyEditor"></bean>

-->

</beans>