初学者-Spring Boot-如何打印@RequestParam

Question

I'm learning Spring Boot .

What should I do to display param (city) from @RequestParam in the show method?

(I have two html . First with form and button to submit and second page to show the String value from form ).

@GetMapping("/show")
public String show(@RequestParam ("city") String city, ModelMap modelMap){
    modelMap.addAttribute("article");
    System.out.println(city);
    return "article/show";
}

Answer 1

If you want show city inside a view you have to add the city to the model, something like:

model.addAttribute("city", city);

and inside the view ${city}

Instead if you want print the parameter using the console , you can use a logger:

inside your controllore declare it in this way

final Logger logger = LoggerFactory.getLogger(YourClass.class);

then inside the method:

 @GetMapping("/show")
public String show(@RequestParam ("city") String city, ModelMap modelMap){
    modelMap.addAttribute("article");

    logger.info("whatever you want "+city);

    return "article/show";
}

Answer 2

Try this: modelMap.addAttribute("city", city); and then retrieve it in the JSP / Thymeleaf side like ${city} .