~碼鈴薯~

需求：將Customer中address屬性的值賦值給Address類中的每一個屬性

package com.atguigu.selfEditor;

public class Address {

    private String province;
    private String city;
    private String town;

    public String getProvince() {
        return province;
    }

    public void setProvince(String province) {
        this.province = province;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }

    public String getTown() {
        return town;
    }

    public void setTown(String town) {
        this.town = town;
    }

    @Override
    public String toString() {
        return "Address{" +
                "province='" + province + '\'' +
                ", city='" + city + '\'' +
                ", town='" + town + '\'' +
                '}';
    }
}

package com.atguigu.selfEditor;

public class Customer {

    private Address address;

    private String name;

    public Address getAddress() {
        return address;
    }

    public void setAddress(Address address) {
        this.address = address;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String toString() {
        return "Customer{" +
                "address=" + address +
                ", name='" + name + '\'' +
                '}';
    }
}

package com.atguigu.selfEditor;

import java.beans.PropertyEditorSupport;

public class AddressPropertyEditor extends PropertyEditorSupport {
    @Override
    public void setAsText(String text) throws IllegalArgumentException {
        String[] s = text.split("_");
        Address address = new Address();
        address.setProvince(s[0]);
        address.setCity(s[1]);
        address.setTown(s[2]);

        this.setValue(address);
    }

}

package com.atguigu.selfEditor;

import org.springframework.beans.PropertyEditorRegistrar;
import org.springframework.beans.PropertyEditorRegistry;

public class AddressPropertyEditorRegistrar implements PropertyEditorRegistrar {
    @Override
    public void registerCustomEditors(PropertyEditorRegistry registry) {
        registry.registerCustomEditor(Address.class,new AddressPropertyEditor());
    }
}

<?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:msb="http://www.mashibing.com/schema/user"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="
           http://www.springframework.org/schema/beans
           http://www.springframework.org/schema/beans/spring-beans.xsd
           http://www.springframework.org/schema/context
           http://www.springframework.org/schema/context/spring-context.xsd
           http://www.springframework.org/schema/tx
           http://www.springframework.org/schema/tx/spring-tx.xsd
           http://www.mashibing.com/schema/user http://www.mashibing.com/schema/user.xsd">



    <bean id="customer" class="com.atguigu.selfEditor.Customer">
        <property name="name" value="zhangsan"></property>
        <property name="address" value="河北省_邯鄲市_武安市"></property>
    </bean>
    <!--第一種配置方式-->
<!--    <bean class="org.springframework.beans.factory.config.CustomEditorConfigurer">-->
<!--        <property name="propertyEditorRegistrars">-->
<!--            <list>-->
<!--                <bean class="com.atguigu.selfEditor.AddressPropertyEditorRegistrar"></bean>-->
<!--            </list>-->
<!--        </property>-->
<!--    </bean>-->
    <!--第二種配置方式-->
    <bean class="org.springframework.beans.factory.config.CustomEditorConfigurer">
        <property name="customEditors">
            <map>
                <entry key="com.atguigu.selfEditor.Address">
                    <value>com.atguigu.selfEditor.AddressPropertyEditor</value>
                </entry>
            </map>
        </property>
    </bean>
</beans>

package com.atguigu;

/**
 * Hello world!
 */
public class App {
    public static void main(String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("selfEditor.xml");
        Customer user = (Customer)context.getBean(Customer.class);
        System.out.println(user);

    }
}
output:
Customer{address=Address{province='河北省', city='邯鄲市', town='武安市'}, name='zhangsan'}

來源思路：

@Override
public void refresh() throws BeansException, IllegalStateException {
    synchronized (this.startupShutdownMonitor) {
       // Prepare this context for refreshing.
       prepareRefresh();

       // Tell the subclass to refresh the internal bean factory.
       ConfigurableListableBeanFactory beanFactory = obtainFreshBeanFactory();

       // Prepare the bean factory for use in this context.
       // 點進去
       prepareBeanFactory(beanFactory);

       try {
          // Allows post-processing of the bean factory in context subclasses.
          postProcessBeanFactory(beanFactory);

          // Invoke factory processors registered as beans in the context.
          invokeBeanFactoryPostProcessors(beanFactory);

          // Register bean processors that intercept bean creation.
          registerBeanPostProcessors(beanFactory);

          // Initialize message source for this context.
          initMessageSource();

          // Initialize event multicaster for this context.
          initApplicationEventMulticaster();

          // Initialize other special beans in specific context subclasses.
          onRefresh();

          // Check for listener beans and register them.
          registerListeners();

          // Instantiate all remaining (non-lazy-init) singletons.
          finishBeanFactoryInitialization(beanFactory);

          // Last step: publish corresponding event.
          finishRefresh();
       }

       catch (BeansException ex) {
          if (logger.isWarnEnabled()) {
             logger.warn("Exception encountered during context initialization - " +
                   "cancelling refresh attempt: " + ex);
          }

          // Destroy already created singletons to avoid dangling resources.
          destroyBeans();

          // Reset 'active' flag.
          cancelRefresh(ex);

          // Propagate exception to caller.
          throw ex;
       }

       finally {
          // Reset common introspection caches in Spring's core, since we
          // might not ever need metadata for singleton beans anymore...
          resetCommonCaches();
       }
    }
}

protected void prepareBeanFactory(ConfigurableListableBeanFactory beanFactory) {
    // Tell the internal bean factory to use the context's class loader etc.
    beanFactory.setBeanClassLoader(getClassLoader());
    beanFactory.setBeanExpressionResolver(new StandardBeanExpressionResolver(beanFactory.getBeanClassLoader()));
    // 主要來源于這一行代碼
    beanFactory.addPropertyEditorRegistrar(new ResourceEditorRegistrar(this, getEnvironment()));

    // Configure the bean factory with context callbacks.
    beanFactory.addBeanPostProcessor(new ApplicationContextAwareProcessor(this));
    beanFactory.ignoreDependencyInterface(EnvironmentAware.class);
    beanFactory.ignoreDependencyInterface(EmbeddedValueResolverAware.class);
    beanFactory.ignoreDependencyInterface(ResourceLoaderAware.class);
    beanFactory.ignoreDependencyInterface(ApplicationEventPublisherAware.class);
    beanFactory.ignoreDependencyInterface(MessageSourceAware.class);
    beanFactory.ignoreDependencyInterface(ApplicationContextAware.class);

    // BeanFactory interface not registered as resolvable type in a plain factory.
    // MessageSource registered (and found for autowiring) as a bean.
    beanFactory.registerResolvableDependency(BeanFactory.class, beanFactory);
    beanFactory.registerResolvableDependency(ResourceLoader.class, this);
    beanFactory.registerResolvableDependency(ApplicationEventPublisher.class, this);
    beanFactory.registerResolvableDependency(ApplicationContext.class, this);

    // Register early post-processor for detecting inner beans as ApplicationListeners.
    beanFactory.addBeanPostProcessor(new ApplicationListenerDetector(this));

    // Detect a LoadTimeWeaver and prepare for weaving, if found.
    if (beanFactory.containsBean(LOAD_TIME_WEAVER_BEAN_NAME)) {
       beanFactory.addBeanPostProcessor(new LoadTimeWeaverAwareProcessor(beanFactory));
       // Set a temporary ClassLoader for type matching.
       beanFactory.setTempClassLoader(new ContextTypeMatchClassLoader(beanFactory.getBeanClassLoader()));
    }

    // Register default environment beans.
    if (!beanFactory.containsLocalBean(ENVIRONMENT_BEAN_NAME)) {
       beanFactory.registerSingleton(ENVIRONMENT_BEAN_NAME, getEnvironment());
    }
    if (!beanFactory.containsLocalBean(SYSTEM_PROPERTIES_BEAN_NAME)) {
       beanFactory.registerSingleton(SYSTEM_PROPERTIES_BEAN_NAME, getEnvironment().getSystemProperties());
    }
    if (!beanFactory.containsLocalBean(SYSTEM_ENVIRONMENT_BEAN_NAME)) {
       beanFactory.registerSingleton(SYSTEM_ENVIRONMENT_BEAN_NAME, getEnvironment().getSystemEnvironment());
    }
}