Spring自定义属性编辑器

概念

我们在xml定义bean时，输入的内容都是字符串。spring会根据已经注册好的属性编辑器解析这些字符串，实例化成对应的类型。下面演示一个实例，Customer有一个属性Address，在配置这个Bean时，直接配置成“浙江-杭州-西湖”,根据自定的属性编辑器生成Address对象，并打印出“浙江省杭州市西湖区”。

源码

Bean定义

package exa.ydoing.spring;
class Address {
/*
* 区
*/
private String district;
/*
* 市
*/
private String city;
/*
* 省
*/
private String province;
public String getDistrict() {
return district;
}
public void setDistrict(String district) {
this.district = district;
}
public String getCity() {
return city;
}
public void setCity(String city) {
this.city = city;
}
public String getProvince() {
return province;
}
public void setProvince(String province) {
this.province = province;
}
public String toString() {
return this.province + "省" + this.city + "市" + this.district + "区";
}
}
public class Customer {
private String name;
private Address address;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Address getAddress() {
return address;
}
public void setAddress(Address address) {
this.address = address;
}
}

自定义属性编辑器

package exa.ydoing.spring;
import java.beans.PropertyEditorSupport;
import org.springframework.util.Assert;
public class AddressPropertyEditor extends PropertyEditorSupport {
public void setAsText(String text) {
try {
Assert.notNull(text);
String[] adds = text.split("-");

Address address = new Address();
address.setProvince(adds[0]);
address.setCity(adds[1]);
address.setDistrict(adds[2]);
this.setValue(address);
} catch (Exception e) {
e.printStackTrace();
}
}
}

Bean的配置

<?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" xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd">
<bean id="customer" class="exa.ydoing.spring.Customer">
<property name="name" value="Jack" />
<property name="address" value="浙江-杭州-西湖" />
</bean>
<bean id="customEditorConfigurer"
class="org.springframework.beans.factory.config.CustomEditorConfigurer">
<property name="customEditors">
<map>
<entry key="exa.ydoing.spring.Address">
<bean class="exa.ydoing.spring.AddressPropertyEditor" />
</entry>
</map>
</property>
</bean>
</beans>

测试

package exa.ydoing.spring;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
public class App
{
public static void main( String[] args )
{
ApplicationContext ctx = new ClassPathXmlApplicationContext("ApplicationContext.xml");
Customer c = ctx.getBean("customer", Customer.class);

//输出
System.out.println(c.getAddress().toString());

}
}

输出

浙江省杭州市西湖区