Spring攻略学习笔记 ------创建自定义属性编辑器

、知识点

通过实现java.beans.PropertyEditor接口或者继承便利的支持类 java.beans.PropertyEditorSupport，可以编写自定义的属性编辑器。

二、代码示例

Product类的属性编辑器

[java] package com.codeproject.jackie.springrecipesnote.springadvancedioc;

import java.beans.PropertyEditorSupport;

/**
* Product类的属性编辑器
* @author jackie
*
*/
public class ProductEditor extends PropertyEditorSupport {

/**
* 将属性转换成字符串值
*/
public String getAsText() {
Product product = (Product) getValue();
return product.getClass().getName() + "," + product.getName() + "," + product.getPrice();
}

/**
* 将字符串转换成属性
*/
public void setAsText(String text) throws IllegalArgumentException {
String[] parts = text.split(",");
try {
Product product = (Product) Class.forName(parts[0]).newInstance();
product.setName(parts[1]);
product.setPrice(Double.parseDouble(parts[2]));
setValue(product);
} catch (Exception e) {
throw new IllegalArgumentException(e);
}
}
}

package com.codeproject.jackie.springrecipesnote.springadvancedioc;

import java.beans.PropertyEditorSupport;

/**
* Product类的属性编辑器
* @author jackie
*
*/
public class ProductEditor extends PropertyEditorSupport {

/**
* 将属性转换成字符串值
*/
public String getAsText() {
Product product = (Product) getValue();
return product.getClass().getName() + "," + product.getName() + "," + product.getPrice();
}

/**
* 将字符串转换成属性
*/
public void setAsText(String text) throws IllegalArgumentException {
String[] parts = text.split(",");
try {
Product product = (Product) Class.forName(parts[0]).newInstance();
product.setName(parts[1]);
product.setPrice(Double.parseDouble(parts[2]));
setValue(product);
} catch (Exception e) {
throw new IllegalArgumentException(e);
}
}
}

实际上，JavaBeans API将自动搜索类的属性编辑器。为了能搜索到正确的属性编辑器，它必须位于目标类的相同包里，名称必须是目标类名加上Editor后缀。如果你自定义的属性编辑器遵照这种约定，就像ProductEditor，那么就没有必要再Spring IoC容器中再次注册。否则的话，必须要在CustomEditorConfigurer实例中注册自定义编辑器，才能使用它。注册方法与内置编辑器相同。

[java] < xml version="1.0" encoding="UTF-8" >
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-3.2.xsd">

















com.codeproject.jackie.springrecipesnote.springadvancedioc.Disc,CD-RW,1.5

< xml version="1.0" encoding="UTF-8" >
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-3.2.xsd">

















com.codeproject.jackie.springrecipesnote.springadvancedioc.Disc,CD-RW,1.5