As shown below, create two controllers to test the jump effect. All of the following jump modes take these two controllers as examples.

response.sendRedirect("redirect: mapping path? Parameter name =" + parameter value);

package com.demo.controller.Jump;

import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * Created by toutou on 2019/1/27.
 */
@Controller
@Slf4j
public class FirstJumpController {
    @RequestMapping(value = "/myfirst")
    public String MyFirst(){
        // If used ModelAndView mode: return new ModelAndView("forward:/mysecond");
        // forward It is a request forwarding and a server-side behavior, which is equivalent to a request in the address bar URL It won't change.
        return "forward:/mysecond";
    }
}

    @RequestMapping(value = "/myfirst2")
    public String MyFirst2(){
        // redirect It's a request redirection and a client behavior. It's equivalent to two requests in the address bar URL Will change.
        return "redirect:/mysecond";
    }

    @RequestMapping(value = "/myfirst3")
    public String MyFirst3(String name){
        // redirect It's a request redirection and a client behavior. It's equivalent to two requests in the address bar URL Will change.
        return "redirect:/mysecond2?name=" + name;
    }

bug: if the parameter contains Chinese characters, it is easy to cause problems

The first is: redirectattributes. AddAttribute ("prama", value);

redirectAttributes.addAttribute("prama1",value1);
redirectAttributes.addAttribute("prama2",value2);
return:"redirect: /path/list" 

Insufficient: this method is equivalent to appending the passed parameter to the redirect link address: return:"redirect: / path/list"? Prama1 = value1 & prama2 = Value2 (directly appending parameters exposes the passed parameters to the address of the link, which is very unsafe)

The second is: redirectAttributes.addFlashAttribute("prama",value);

redirectAttributes.addFlashAttribute("prama1",str);
redirectAttributes.addFlashAttribute("prama2",list);
redirectAttributes.addFlashAttribute("prama3",map);
return:"redirect: /path/list" ;

This method hides the parameters and does not directly expose the link address, but can and can only obtain the value of prama on the redirected page. The principle is that the parameters are put into the session, and the session removes the object immediately after the jump. If you redirect to a controller, you cannot get the value of the prama.

public ModelAndView findProjectPage() {
        ModelAndView modelAndView = new ModelAndView("redirect:Mapping path?Parameter name="+Parameter value);
        XXXXXXX
        return modelAndView;
    }

v source address

https://github.com/toutouge/javademosecond/tree/master/hellospringboot