Spring MVC中使用Controller如何进行重定向

package edu.mvcdemo.controller;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;

import org.springframework.context.annotation.Scope;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import edu.mvcdemo.utils.StringUtils;

/**

  * @编写人： yh.zeng

  * @编写时间：2017-7-13 上午9:10:29

  * @文件描述: Spring MVC重定向demo

  */

@Controller

@Scope ( "singleton" ) //只实例化一个bean对象（即每次请求都使用同一个bean对象），默认是singleton

@RequestMapping ( "/redirect" )

public class RedirectURLController {   

     private Logger logger = Logger.getLogger(RedirectURLController. class ); 

     /**

      * 方式一：方法返回的URI（相对路径）中加上"redirect:"前缀，声明要重定向到该地址

      *        "redirect:"后面跟着的是"/"和不跟着"/"是不一样的：

      *        1) "redirect:"后面跟着"/"： 说明该URI是相对于项目的Context ROOT的相对路径

      *        2) "redirect:"后面没有跟着"/"： 说明该URI是相对于当前路径

      * @return

      */

     @RequestMapping (value= "/demo1" , method=RequestMethod.GET)

     private String testRedirect1(){

         //注意："redirect:/hello/world" 和 "redirect:hello/world"这两种写法是不一样的！！

         //     本案例中：

         //     "redirect:/hello/world" 重定向到的URL路径为：协议://服务器IP或服务器主机名:端口号/项目的Context ROOT/hello/world

         //     "redirect:hello/world"  重定向到的URL路径为：协议://服务器IP或服务器主机名:端口号/项目的Context ROOT/redirect/hello/world

         return "redirect:/hello/world" ;

     }

     /**

      * 方式二：使用HttpServletResponse对象进行重定向，HttpServletResponse对象通过方法入参传入

      * @param request

      * @param response

      * @return

      * @throws IOException

      */

     @RequestMapping (value= "/demo2" , method=RequestMethod.GET)

     private void testRedirect2(HttpServletRequest request ,HttpServletResponse response){

         String pathPrefix = StringUtils.getWebContextPath(request);

         String redirectURL = pathPrefix + "/hello/world" ;

         logger.info(redirectURL);

         try {

             response.sendRedirect(redirectURL);

         } catch (IOException e) {

             logger.error(StringUtils.getExceptionMessage(e));

         }

     }

}

package edu.mvcdemo.utils;

import java.io.PrintWriter;

import java.io.StringWriter;

import javax.servlet.http.HttpServletRequest;

/**

  * @编写人： yh.zeng

  * @编写时间：2017-7-9 下午2:56:21

  * @文件描述: todo

  */

public class StringUtils { 

     /**

      * 获取异常信息

      *

      * @param e

      * @return

      */

     public static String getExceptionMessage(Exception e) {

         StringWriter stringWriter = new StringWriter();

         PrintWriter printWriter = new PrintWriter(stringWriter);

         e.printStackTrace(printWriter);

         return stringWriter.toString();

     }   

     /**

      * 返回web项目的context path，格式 为：协议://服务器IP或服务器主机名:端口号/项目的Context ROOT

      * @param request

      * @return

      */

     public static String getWebContextPath(HttpServletRequest request){

         StringBuilder webContextPathBuilder = new StringBuilder();

         webContextPathBuilder.append(request.getScheme())

                              .append( "://" )

                              .append(request.getServerName())

                              .append( ":" )

                              .append(request.getServerPort())

                              .append(request.getContextPath());

         return webContextPathBuilder.toString();

     }

}

@GetMapping (value = "/index" )

   @ApiOperation ( "首页" )

   public void index(HttpServletRequest request, HttpServletResponse response)  throws Exception  {

  request.getRequestDispatcher( "/index.html" ).forward(request, response);

  }

@GetMapping (value = "/index" )

    @ApiOperation ( "首页" )

    public void index(HttpServletRequest request, HttpServletResponse response) throws IOException {

        response.sendRedirect( "/index.html" );

    }

return new ModelAndView([redirect:/toList]);