java spring boot 跳转

@RequestMapping("/TestLink1")
@GetMapping
@PostMapping
@ResponseBody
public ModelAndView TestLink1()
{
    ModelAndView modelAndView = new ModelAndView();
    modelAndView.setViewName("TestLink2");
    modelAndView.addObject("key222", 12345);
    return modelAndView;

}
@RequestMapping("/TestLink2")
@GetMapping
@PostMapping
@ResponseBody
public String TestLink2(@RequestParam(required = true, defaultValue = "") String key222)
{
return key222;
}


@RequestMapping("/TestLink3")
@GetMapping
@PostMapping
@ResponseBody
public ModelAndView  TestLink3()
{
return new ModelAndView("redirect:http://www.baidu.com");

}
@RequestMapping("/TestLink4")
@GetMapping
@PostMapping
public String  TestLink4()
{
return "redirect:http://www.baidu.com";
}
@RequestMapping("/TestLink5")
@GetMapping
@PostMapping
public String TestLink5(HttpServletResponse response)
{
try {
        response.sendRedirect("http://www.baidu.com");
    } catch (IOException e)
    {
        e.printStackTrace();
    }
return  "";
}