Spring 的拦截器如何实现url转发? 报错

Spring 的拦截器如何实现url转发? 400 报错

如何实现Spring 的过滤器代码中改写请求的URL，并转发出去，注意，是转发，不是重定向

package com.blog.inteceptor;

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

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

import com.blog.entity.User;

public class HandlerInteceptor implements HandlerInterceptor{

	public void afterCompletion(HttpServletRequest arg0,
			HttpServletResponse arg1, Object arg2, Exception arg3)
			throws Exception {
		System.out.println("执行后");
		
	}

	public void postHandle(HttpServletRequest arg0, HttpServletResponse arg1,
			Object arg2, ModelAndView arg3) throws Exception {
		System.out.println(".....");
		
	}

	public boolean preHandle(HttpServletRequest request, HttpServletResponse res,
			Object arg2) throws Exception {
		System.out.println("拦截用户");
		String url = request.getScheme() +"://" + request.getServerName()  
                + ":" +request.getServerPort() 
                + request.getServletPath();
		System.out.println(url);
		//在这里使用forward实现转发，而不是使用redirect实现重定向
		return true;
	}

}