OkHttpClient

OkHttp 는 REST API, HTTP 통신을 간편하게 구현할 수 있도록 다양한 기능을 제공해주는 자바 라이브러리

 

---

OkHttp 라이브러리를 사용하기 위해서 메이븐 Dependencies 설정이 필요

<dependency>
  <groupId>com.squareup.okhttp3</groupId>
  <artifactId>okhttp</artifactId>
  <version>3.10.0</version>
</dependency>

---

Get 방식

URL url = new URL(requestUrl);

OkHttpClient client = new OkHttpClient();

Request request = new Requester.Builder()
                               .url(url)
                               .header("Content-type", "")
                               .build();
                               
Response response = client.newCall(request).execute();

Post 방식

URL url = new URL(requestUrl);

OkHttpClient client = new OkHttpClient();


RequestBody requestBody = RequestBody.create(MediaType.parse("application/json; charset=utf-8"), requestData.toString());
Request request = new Requester.Builder()
                               .url(url)
                               .header("Content-type", "application/json")
                               .post(requestBody)
                               .build();
                               
Response response = client.newCall(request).execute();

 

* URL 클래스 

=> 주요 생성자 

https://, www.naver.com/, index.html, :8080    

(protocol,      host,                  file,        port)

---

비동기 요청

 

execute() 대신 enqueue() 사용

*Callback에는 다음 인터페이스를 구현해야함
public interface Callback{
    void onFailure(Call call, IOException e);
    void onResponse(Call call, Response response) throws IOException;
}

client.newCall(request).enqueue(new Callback(){
    @Override
    public void onFailure(Call call, IOException e){
    	System.err.println("error");
    }
    @Override
    public void onResponse(Call call, Response response) thorws IOException{
        ResponseBody body = response.body();
        System.out.println(body.string());
        body.close();
    }
});