[Springboot] RESTful Get해보기

- Get은 Pathvariable, QueryParameter 사용가능

 

1. src > main > java > 패키지 > controller 패키지 생성 후 GetController.class 생성

2. src > main > java > 패키지 > dto 생성 후 UserDto 생성

3. DTO(UserRequest)

package com.example.springboot202111.dto;

public class UserRequest {

    private String user;
    private String email;
    private int age;

    public String getUser() {
        return user;
    }

    public void setUser(String user) {
        this.user = user;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "UserRequest{" +
                "user='" + user + '\'' +
                ", email='" + email + '\'' +
                ", age=" + age +
                '}';
    }
}

3. @GetMapping 

package com.example.springboot202111.controller;

import ch.qos.logback.core.net.SyslogOutputStream;
import com.example.springboot202111.dto.UserRequest;
import org.springframework.web.bind.annotation.*;

import java.util.Map;

@RestController // RESTAPIController 사용한다는 것을 알려줌
@RequestMapping("/api/get")  // localhost:8080/api/get 매핑
public class GetController {
    
     
    //가장 많이 사용
    //http://localhost:8080/api/get/queryParam3?user=jiyeon&email=jiyoen@naver.com&age=20
    @GetMapping(path = "/queryParam3")
    public String queryParam3(UserRequest userRequest){
    	
        // userDTO에서 UserRequest userRequest 값가져옴
        
        System.out.println(userRequest.getUser());
        System.out.println(userRequest.getEmail());
        System.out.println(userRequest.getAge());
        return userRequest.toString();
        
    };
    
    
    //@RequestMapping("/hi") // get/ post / put / delete 모든 RESTful 동작
    //@RequestMapping(path = "/hi", method = RequestMethod.GET) // 메서드 설정시  get http//localhost:8080/api/get/hi
    //@GetMapping(path = "getHello") : 명시적
    @GetMapping("/getHello")    // http://localhost:8080/api/get/getHello
    public String getHello(){
        return "get Hello";
    };

    //변화하는 부분은 @PathVariable을 사용
    //public String pathVariale(@PathVariable String name){
    // @PathVariable(name = "name") name 변수명을 다르게 설정
    @GetMapping("/pathVariale/{name}") // ://localhost:8080/api/get/pathVariale/내가 입력한 path
    public String pathVariale(@PathVariable(name = "name") String pathName){
        System.out.println("PathVariable : " + pathName );
        return pathName;
    };

    //http://localhost:8080/api/get/queryParam?user=jiyeon&email=jiyoen@naver.com&age=20
    @GetMapping(path = "/queryParam")
    public String queryParam(@RequestParam Map<String, String > queryParams){
        StringBuilder sb = new StringBuilder();
        queryParams.entrySet().forEach(val -> {
            System.out.println(val.getKey());
            System.out.println(val.getValue());
            System.out.println("\n");

            sb.append(val.getKey() +" = "+ val.getValue());

        });
        return sb.toString();
    };

    //http://localhost:8080/api/get/queryParam2?user=jiyeon&email=jiyoen@naver.com&age=20
    @GetMapping(path = "/queryParam2")
    public String queryParam2(
            @RequestParam String user,
            @RequestParam String email,
            @RequestParam int age
    ){
        System.out.println(user);
        System.out.println(email);
        System.out.println(age);
        return user +" "+ email +" "+ age;
    };
   
}

참고. 패스트캠퍼스 Springboot강의