9.自定义属性编辑器PropertyEditor（主要针对的是自定义的类，不常用，还是用ref注入的多见）

作用：Spring中我们可以使用属性编辑器来`将特定的字符串转换为对象`
通过set注入时，想简单的这种是spring提供好了属性编辑器,将value="20"中的字符串转换成了int类型的20<property name="age" value="20"></property>
但是像下面的这种，value="甘肃兰州"，spring是没办法自动将字符串转为Address类型，所以需要我们
自己手动的去写属性编辑器<property name="address" value="甘肃兰州"></property>
java.beans.PropertyEditor(JDK中的接口)用于将xml文件中字符串转换为特定的类型,同时JDK为我
们提供一个实现类java.beans.PropertyEditorSupport

Student.java

public class Student {private long id;private String name;private boolean gender;private int age;private Address address;//要引入Address类型public Address getAddress() {return address;}public void setAddress(Address address) {this.address = address;}public long getId() {return id;}public void setId(long id) {this.id = id;}public String getName() {return name;}public void setName(String name) {this.name = name;}public boolean isGender() {return gender;}public void setGender(boolean gender) {this.gender = gender;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public String toString(){return "id="+id+" name="+name+" gender="+gender+" age="+age+" address:"+address;}
}

Address.java

public class Address {private String city;private String street;private String country;public Address(){}public Address(String city, String street, String country) {this.city = city;this.street = street;this.country = country;}public String getCity() {return city;}public void setCity(String city) {this.city = city;}public String getStreet() {return street;}public void setStreet(String street) {this.street = street;}public String getCountry() {return country;}public void setCountry(String country) {this.country = country;}public String toString(){return "city="+city+" street="+street+" country="+country;}
}

PropertyEditorSupport.java
一定要继承PropertyEditorSupport类，重写里面的setAsText()方法

import java.beans.PropertyEditorSupport;
//一定要继承PropertyEditorSupport类，重写里面的方法
public class AddressEditor extends PropertyEditorSupport {@Overridepublic void setAsText(String text) throws IllegalArgumentException {//"江苏,昆山,浦东软件园"String[] str = text.split(","); //按照自己的规则是什么符号分割xml里面传过来的value值String city = str[0];String street = str[1];String country = str[2];Address add = new Address(city, street, country);//把新的值设置到对象中setValue(add);//setValue我们不需要管，直接调用}
}

proEdit.xml
之前是这样的<property name="address" ref="add"></property>,通过ref注入，
现在是将<property name="address" value="江苏,昆山,浦东软件园" ></property>" 识别成一个Address

<?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-3.2.xsd"><bean name="student" class="com.briup.ioc.proEdit.Student"><property name="id" value="1"></property><property name="name" value="tom"></property><property name="gender" value="true"></property><property name="age" value="20"></property><property name="address" value="江苏,昆山,浦东软件园" ></property></bean>
</beans>

测试类：

@Test
//知识点: 使用自定义属性编辑器
public void ioc_proEdit() {try {String[] path = {"com/briup/ioc/proEdit/proEdit.xml"};ApplicationContext container = new ClassPathXmlApplicationContext(path);Student stu=(Student) container.getBean("student");	System.out.println(stu.getAddress());} catch (Exception e) {e.printStackTrace();}
}

结果：可以通过Student拿到Address对象