给旧系统做了个小功能，要调用到其他服务。因为没有fegin，就通过HTTP来发请求。
工具类 public class OkHttpUtil { private static final MediaType JSON = MediaType.parse("application/json; charset=utf-8"); private static OkHttpClient client = new OkHttpClient(); public static Response get(String url) throws IOException { Request request = new Request.Builder() .url(url) .build(); return client.newCall(request).execute(); } public static Response post(String url, String json) throws IOException { RequestBody body = RequestBody.create(JSON, json); Request request = new Request.Builder() .url(url) .post(body) .build(); return client.newCall(request).execute(); } public static Response put(String url, String json) throws IOException { RequestBody body = RequestBody.create(JSON, json); Request request = new Request.Builder() .url(url) .put(body) .build(); return client.newCall(request).execute(); } public static Response delete(String url) throws IOException { Request request = new Request.Builder() .url(url) .delete() .build(); return client.newCall(request).execute(); } public static Response delete(String url, String json) throws IOException { RequestBody body = RequestBody.create(JSON, json); Request request = new Request.Builder() .url(url) .delete(body) .build(); return client.newCall(request).execute(); } } 使用 // jsonString是json格式字符串 Response response = OkHttpUtil.put(url, jsonString); logger.info("update response: {}", response); // 这里可以拿到请求返回的json串 String responseJson = response.body().string(); logger.info("update responseJson: {}", responseJson);