HttpClient 공통 Util을 소개합니다.
package x.util;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.util.Map;
/**
* packageName : x.util;
*/
public class HttpClientUtil {
private static final HttpClient httpClient = HttpClient.newHttpClient();
private static final ObjectMapper objectMapper = new ObjectMapper();
/**
* Get t.
*
* @param <T> the type parameter
* @param url the url
* @param headers the headers
* @param responseType the response type
* @return the t
* @throws IOException the io exception
* @throws InterruptedException the interrupted exception
*/
public static <T> T get(String url, Map<String, String> headers, Class<T> responseType) throws IOException, InterruptedException {
HttpRequest.Builder builder = HttpRequest.newBuilder().uri(URI.create(url)).GET();
addHeaders(builder, headers);
HttpResponse<String> response = httpClient.send(builder.build(), HttpResponse.BodyHandlers.ofString());
return objectMapper.readValue(response.body(), responseType);
}
/**
* Post t.
*
* @param <T> the type parameter
* @param url the url
* @param requestBody the request body
* @param headers the headers
* @param responseType the response type
* @return the t
* @throws IOException the io exception
* @throws InterruptedException the interrupted exception
*/
public static <T> T post(String url, Object requestBody, Map<String, String> headers, Class<T> responseType) throws IOException, InterruptedException {
String json = objectMapper.writeValueAsString(requestBody);
HttpRequest.Builder builder = HttpRequest.newBuilder().uri(URI.create(url)).POST(HttpRequest.BodyPublishers.ofString(json));
addHeaders(builder, headers);
HttpResponse<String> response = httpClient.send(builder.build(), HttpResponse.BodyHandlers.ofString());
return objectMapper.readValue(response.body(), responseType);
}
/**
* Put t.
*
* @param <T> the type parameter
* @param url the url
* @param requestBody the request body
* @param headers the headers
* @param responseType the response type
* @return the t
* @throws IOException the io exception
* @throws InterruptedException the interrupted exception
*/
public static <T> T put(String url, Object requestBody, Map<String, String> headers, Class<T> responseType) throws IOException, InterruptedException {
String json = objectMapper.writeValueAsString(requestBody);
HttpRequest.Builder builder = HttpRequest.newBuilder().uri(URI.create(url)).PUT(HttpRequest.BodyPublishers.ofString(json));
addHeaders(builder, headers);
HttpResponse<String> response = httpClient.send(builder.build(), HttpResponse.BodyHandlers.ofString());
return objectMapper.readValue(response.body(), responseType);
}
/**
* Delete t.
*
* @param <T> the type parameter
* @param url the url
* @param headers the headers
* @param responseType the response type
* @return the t
* @throws IOException the io exception
* @throws InterruptedException the interrupted exception
*/
public static <T> T delete(String url, Map<String, String> headers, Class<T> responseType) throws IOException, InterruptedException {
HttpRequest.Builder builder = HttpRequest.newBuilder().uri(URI.create(url)).DELETE();
addHeaders(builder, headers);
HttpResponse<String> response = httpClient.send(builder.build(), HttpResponse.BodyHandlers.ofString());
return objectMapper.readValue(response.body(), responseType);
}
private static void addHeaders(HttpRequest.Builder builder, Map<String, String> headers) {
if (headers != null) {
headers.forEach(builder::header);
}
}
}
Map<String, String> headers 은 Header
Object requestBody 는 parameter
Class<T>의 responseType은 응답값을 받고자하는 class 타입을지정
사용법은 아래와 같음
public Map<String, Object> httpClientTest(@PathVariable String method) throws IOException, InterruptedException {
Map<String, Object> response;
if ("get".equals(method)) {
response = HttpClientUtil.get(
"https://jsonplaceholder.typicode.com/posts/1",
Map.of("Content-type", "application/json; charset=UTF-8"),
Map.class
);
} else
if ("post".equals(method)) {
Map<String, Object> map = new HashMap<>();
map.put("title", "foo");
map.put("body", "bar");
map.put("userId", 1);
response = HttpClientUtil.post(
"https://jsonplaceholder.typicode.com/posts",
map,
Map.of("Content-type", "application/json; charset=UTF-8"),
Map.class
);
} else
if ("put".equals(method)) {
Map<String, Object> map = new HashMap<>();
map.put("id", 1);
map.put("title", "foo");
map.put("body", "bar");
map.put("userId", 1);
response = HttpClientUtil.put(
"https://jsonplaceholder.typicode.com/posts/1",
map,
Map.of("Content-type", "application/json; charset=UTF-8"),
Map.class
);
} else {
Map<String, String> map = new HashMap<>();
response = HttpClientUtil.delete(
"https://jsonplaceholder.typicode.com/posts/1",
map,
Map.class
);
}
return null;
}
Gradle 기준 아래 의존성 추가
dependencies {
implementation("com.fasterxml.jackson.core:jackson-databind:2.17.0")
}
https://jsonplaceholder.typicode.com
JSONPlaceholder - Free Fake REST API
{JSON} Placeholder Free fake and reliable API for testing and prototyping. Powered by JSON Server + LowDB. Serving ~3 billion requests each month.
jsonplaceholder.typicode.com
위 사이트는 REST API 테스트를 제공해주는 사이트입니다.
호출 이후 결과도 HTTP Method 에 따라 가이드가 있으니 이용하세요!
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