springboot如何重定向外部网页

package com.liangxs.web;

import java.io.IOException;

import javax.servlet.http.HttpServletResponse;

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

@Controller//注意这里不能用@RestController,RestController由@Controller+ResponseBody组成，返回的是数据中支持跳转视图
@RequestMapping("/upload")
public class TestController {
	@RequestMapping("/redirect")
	public String redirect(HttpServletResponse response) {
		 return "redirect:http://www.baidu.com";//spring redirect方式
	}

	@RequestMapping("/redirect1")
	public void redirect1(HttpServletResponse response) {
		try {
			response.sendRedirect("http://www.baidu.com");//HttpServletResponse方式
		} catch (IOException e) {

			e.printStackTrace();
		}
	}

}

@GetMapping("/delemp/{id}")
public String deleteEmp(@PathVariable("id")Integer id){
    employeeDao.delete(id);
    return "redirect:/emps";
}

@PostMapping("/updateEmp")
public String updateEmp(Employee employee){
    employeeDao.save(employee);
    return "redirect:emps";
}