I'm new to spring boot framework and i was developing spring boot rest API.

i have endpoint and i have query the database from spring boot

/buy?projectionId=value1&place=value2  // we can add different query parameters here

how to write a controller and service using spring boot.

CodePudding user response：

you can pass multiple params in url like, for example:

http://localhost:2000/custom?brand=dell&limit=20&price=20000&sort=asc

and in order to get this query fields , you can use map like

@RequestMapping(method = RequestMethod.GET, value = "/custom")
public String controllerMethod(@RequestParam Map<String, String> customQuery) {

    System.out.println("customQuery = brand "   customQuery.get("brand"));
    System.out.println("customQuery = limit "   customQuery.get("limit"));
    System.out.println("customQuery = price "   customQuery.get("price"));
    System.out.println("customQuery = other "   customQuery.get("other"));
    System.out.println("customQuery = sort "   customQuery.get("sort"));

    return customQuery.toString();
}

CodePudding user response：

1. You can use like below and add more request param.

   @GetMapping("/buy")
   public String buy(@RequestParam("projectionId") long projectionId, 
            @RequestParam("place") String place){
      return "some response"; 
   } 
   

API ENDPOINT: http://your hostname:port/buy?projectionId=value1&place=value2

If you have multiple parameter you can prepare one json.

{
  "field1": "value1",
  "field2": "value2", 
  "field3": "value", 
  "field4": "value",
  "field5": "value5",
  "field6": "value6" 
}

**This JSON take as a payload.**

 public String buy(@RequestBody String payload){  
if(StringUtils.isNotBlank(payload)){
     //String convert into class.
     Test test = new ObjectMapper().readValue(payload, Test.class);
     //Then whatever you want you can use it.

   } 
 return "some response";

}

API ENDPOINT: http://your hostname:port/buy

Request body: { "field1": "value1", "field2": "value2", "field3": "value", "field4": "value", "field5": "value5", "field6": "value6" }

CodePudding user response：

@GetMapping("/api/buy")
@ResponseBody
public String getBuy(@RequestParam String protectId) {
    return "ID: "   protectId;

}

example request will be
http://localhost:8080/api/buy?protectId=abc