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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

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

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