spring 强大的PropertyEditor
今天看了一下spring的Data Binding，觉得挺强大，记录一下，以免忘记。
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的儿子"/>
</bean>
不需要配置son的bean，只需要以上的一个配置，spring就会初始化Son,并把“Dylan的儿子"根据Son的有参构造函数，把值绑定在name属性中。
还可以定义自己的TypeEditor，继承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>
这样，就可以将Son的name属性值绑定为"DYLAN的儿子"。
还有另一种方式
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" />