详解SpringMVC注解@initbinder解决类型转换问题

@InitBinder 
public void initBinder(WebDataBinder binder) { 
  SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd"); 
  dateFormat.setLenient(false); 
  binder.registerCustomEditor(Date.class, new CustomDateEditor(dateFormat, true)); 
}

<!-- 解析器注册 --> 
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"> 
  <property name="messageConverters"> 
    <list> 
      <ref bean="stringHttpMessageConverter"/> 
    </list> 
  </property> 
</bean> 
<!-- String类型解析器，允许直接返回String类型的消息 --> 
<bean id="stringHttpMessageConverter" class="org.springframework.http.converter.StringHttpMessageConverter"/> 

<mvc:annotation-driven>
  <mvc:message-converters>
    <bean class="org.springframework.http.converter.StringHttpMessageConverter">
      <constructor-arg value="UTF-8"/>
    </bean>
  </mvc:message-converters>
</mvc:annotation-driven>

public void registerCustomEditor(Class<?> requiredType, PropertyEditor propertyEditor) {
  getPropertyEditorRegistry().registerCustomEditor(requiredType, propertyEditor);
}

import org.springframework.beans.propertyeditors.PropertiesEditor;
public class DoubleEditor extends PropertyEditorSupport {
  @Override
  public void setAsText(String text) throws IllegalArgumentException {
    if (text == null || text.equals("")) {
      text = "0";
    }
    setValue(Double.parseDouble(text));
  }

  @Override
  public String getAsText() {
    return getValue().toString();
  }
}