springmvc 拦截器、国际化、验证

package com.yawn.intercepter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class UserIntercepter implements HandlerInterceptor {

    // 最后执行的方法，释放资源
    @Override
    public void afterCompletion(HttpServletRequest request,
            HttpServletResponse response, Object object, Exception exception)
            throws Exception {
        System.out.println("afterCompletion------->>>>>>>>");

    }

    // controller 执行完，生成视图之前的动作
    @Override
    public void postHandle(HttpServletRequest request,
            HttpServletResponse response, Object object,
            ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle------->>>>>>>>");

    }

    // controller 执行之前的动作
    @Override
    public boolean preHandle(HttpServletRequest request,
            HttpServletResponse response, Object object) throws Exception {
        System.out.println("preHandle------->>>>>>>>");
        return true;
    }

}

    <!-- 拦截器栈的配置 -->
    <mvc:interceptors>
        <mvc:interceptor>
            <mvc:mapping path="/start.do" />
            <bean class="com.yawn.intercepter.UserIntercepter"></bean>
        </mvc:interceptor>
        <!-- 可定义多个拦截器，形成拦截器栈 -->
        <!-- <mvc:interceptor> -->
        <!-- <mvc:mapping path=""/> -->
        <!-- <bean></bean> -->
        <!-- </mvc:interceptor> -->
    </mvc:interceptors>

<!-- 国际化的配置 -->
    <bean id="messageSource"
        class="org.springframework.context.support.ResourceBundleMessageSource">
        <property name="basename" value="message"></property>    
        <!-- 在classpath下搜索message.properties文件 -->
    </bean>

package com.yawn.controller;

import javax.validation.Valid;

import org.springframework.stereotype.Controller;
import org.springframework.validation.BindingResult;
import org.springframework.web.bind.annotation.RequestMapping;

import com.yawn.po.User;

@Controller
public class TestController {
    
    @RequestMapping(value="/start")
    private String start(@Valid User user, BindingResult result) {
        
        /*
         * 1.在User前添加@valid注解后，可自动根据User类中的规则对各个字段进行验证
         * 
         * 2.表单的验证信息都封装在result中，如果有错误，则可以从中获得错误的信息，将它返回给页面模型
         */
        if (result.hasErrors()) {
            return "index";
        }
        
        System.out.println(">>>>>>>>>>>>>>>>>>-------");
        
        return "start";
    }
    
}