今天看了一下spring的Data Binding，覺得挺強大，記錄一下，以免忘記。
public class User{
private String name;
private Son son;
public Son getSon() {
return son;
}
public void setSon(Son son) {
this.son = son;
}
}
public class Son{
private String name;
public Son(){}
public Son(String name) {
this.name = name;
}
}
<bean id="user" class="com.lhacker.domain.User">
<property name="name" value="Dylan" />
<property name="son" value="Dylan的兒子"/>
</bean>
不需要配置son的bean，只需要以上的一個配置，spring就會初始化Son,並把“Dylan的兒子"根據Son的有參構造函數，把值綁定在name屬性中。
還可以定義自己的TypeEditor，繼承java提供的PropertyEditorSuppor.
public class ExoticTypeEditor extends PropertyEditorSupport {
@Override
public void setAsText(String text) throws IllegalArgumentException {
setValue(new Son(text.toUpperCase()));
}
}
<bean class="org.springframework.beans.factory.config.CustomEditorConfigurer">
<property name="customEditors"> <map> <entry key="com.lhacker.domain.Son"
value="com.lhacker.controller.util.ExoticTypeEditor" /> </map> </property>
</bean>
這樣，就可以將Son的name屬性值綁定爲"DYLAN的兒子"。
還有另一種方式
public class CustomPropertyEditorRegistrar implements PropertyEditorRegistrar {
@Override
public void registerCustomEditors(PropertyEditorRegistry registry) {
registry.registerCustomEditor(Son.class, new ExoticTypeEditor());
}
}
<bean class="org.springframework.beans.factory.config.CustomEditorConfigurer">
<property name="propertyEditorRegistrars">
<list>
<ref bean="customPropertyEditorRegistrar" />
</list>
</property>
</bean>
<bean id="customPropertyEditorRegistrar" class="com.lhacker.controller.util.CustomPropertyEditorRegistrar" />