一、添加依赖
<dependency><groupId>com.squareup.okhttp3</groupId><artifactId>okhttp</artifactId><version>4.9.1</version>
</dependency>
<dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.40</version>
</dependency>
<dependency><groupId>org.apache.commons</groupId><artifactId>commons-lang3</artifactId><version>3.11</version>
</dependency>
二、工具类
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import okhttp3.*;
import org.apache.commons.io.FileUtils;
import org.springframework.web.multipart.MultipartFile;import java.io.File;
import java.io.IOException;
import java.util.Map;
import java.util.Objects;
import java.util.concurrent.TimeUnit;@Slf4j
public class OkHttpUtil {public static final String MEDIA_TYPE_JSON = "application/json; charset=utf-8";private OkHttpUtil() {}/*** 获取默认的OkHttpClient** @return*/public static OkHttpClient getOkHttpClient() {return getOkHttpClient(60, 60, 60);}public static OkHttpClient getOkHttpClient(int connectTimeout, int readTimeOut, int writeTimeOut) {OkHttpClient.Builder builder = new okhttp3.OkHttpClient().newBuilder();builder.connectTimeout(connectTimeout, TimeUnit.SECONDS);builder.readTimeout(readTimeOut, TimeUnit.SECONDS);builder.writeTimeout(writeTimeOut, TimeUnit.SECONDS);return builder.build();}/*** get请求** @param okHttpClient* @param url* @param headers header参数* @return*/public static String get(OkHttpClient okHttpClient, String url, Headers headers) {log.info("okHttpClient get url:{}.", url);Request request = new Request.Builder().url(url).headers(headers).get().build();String responseData = request(okHttpClient, url, request);log.info("okHttpClient get url:{},request responseData====> {}", url, responseData);return responseData;}public static String get(OkHttpClient okHttpClient, String url) {Headers headers = new Headers.Builder().build();return get(okHttpClient, url, headers);}/*** GET请求。使用默认的 okHttpClient 和 headers** @param url* @return*/public static String get(String url) {OkHttpClient okHttpClient = getOkHttpClient();Headers headers = new Headers.Builder().build();return get(okHttpClient, url, headers);}/*** post请求,获取响应结果** @param okHttpClient* @param url* @param bodyJson* @param headers* @return*/public static String post(OkHttpClient okHttpClient, String url, JSONObject bodyJson, Headers headers) {log.info("okHttpClient post url:{}, body====> {}", url, bodyJson);MediaType mediaTypeJson = MediaType.parse(MEDIA_TYPE_JSON);RequestBody requestBody = RequestBody.create(mediaTypeJson, JSON.toJSONString(bodyJson));Request request = new Request.Builder().url(url).headers(headers).post(requestBody).build();String responseData = request(okHttpClient, url, request);log.info("okHttpClient post url:{},post responseData====> {}", url, responseData);return responseData;}public static String post(OkHttpClient okHttpClient, String url, JSONObject bodyJson) {Headers headers = new Headers.Builder().build();return post(okHttpClient, url, bodyJson, headers);}/*** post请求。使用默认的 okHttpClient 和 headers** @param url* @param bodyJson* @return*/public static String post(String url, JSONObject bodyJson) {//使用默认的 okHttpClientOkHttpClient okHttpClient = getOkHttpClient();Headers headers = new Headers.Builder().build();//如果需要自定义 okHttpClient或headers传参,可以调用以下方法return post(okHttpClient, url, bodyJson, headers);}/*** 获取响应结果** @param okHttpClient* @param url* @param request* @return*/public static String request(OkHttpClient okHttpClient, String url, Request request) {String responseData = "";try (Response response = okHttpClient.newCall(request).execute()) {if (response != null && response.body() != null) {return response.body().string();}} catch (Exception e) {log.error("okHttpClient getResponse error.url:{}", url, e);}return responseData;}/*** 上传文件** @param okHttpClient okHttp客户端* @param url 上传文件的url* @param fileKey 文件对应的key* @param formDataJson form-data参数* @param headers* @param file* @return*/public static String uploadFile(OkHttpClient okHttpClient, String url,String fileKey, File file, JSONObject formDataJson, Headers headers) {log.info("uploadFile url:{}, uploadFile formDataJson====> {}", url, formDataJson);// 支持传文件的同时,传参数。MultipartBody requestBody = getMultipartBody(fileKey, file, formDataJson);// 构建request请求体Request request = new Request.Builder().url(url).headers(headers).post(requestBody).build();String responseData = request(okHttpClient, url, request);// 会在本地产生临时文件,用完后需要删除if (file.exists()) {file.delete();}return responseData;}/*** 上传文件** @param url* @param fileKey form-data文件对应的key* @param multipartFile 文件上传对应的 multipartFile* @param formDataJson form-data参数* @return*/public static String uploadFile(String url,String fileKey, MultipartFile multipartFile, JSONObject formDataJson) {//使用默认的okHttpClientOkHttpClient okHttpClient = getOkHttpClient();Headers headers = new Headers.Builder().build();return uploadFile(okHttpClient, url, fileKey, getFile(multipartFile), formDataJson, headers);}public static String uploadFile(OkHttpClient okHttpClient, String url,String fileKey, File file, JSONObject formDataJson) {Headers headers = new Headers.Builder().build();return uploadFile(okHttpClient, url, fileKey, file, formDataJson, headers);}/*** 上传文件* 使用默认的okHttpClient** @param url* @param fileKey form-data文件对应的key* @param file 文件* @param formDataJson form-data参数* @return*/public static String uploadFile(String url,String fileKey, File file, JSONObject formDataJson) {//使用默认的okHttpClientOkHttpClient okHttpClient = getOkHttpClient();Headers headers = new Headers.Builder().build();return uploadFile(okHttpClient, url, fileKey, file, formDataJson, headers);}/*** 上传文件用。构建form-data 参数** @param fileKey 文件对应的key* @param file 文件* @param formDataJson form-data参数* @return*/public static MultipartBody getMultipartBody(String fileKey, File file, JSONObject formDataJson) {RequestBody fileBody = RequestBody.create(MultipartBody.FORM, file);MultipartBody.Builder bodyBuilder = new MultipartBody.Builder();// 设置传参为form-data格式bodyBuilder.setType(MultipartBody.FORM);bodyBuilder.addFormDataPart(fileKey, file.getName(), fileBody);// 添加 form-data参数for (Map.Entry<String, Object> entry : formDataJson.entrySet()) {//参数通过 bodyBuilder.addFormDataPart(key, value) 添加bodyBuilder.addFormDataPart(entry.getKey(), Objects.toString(entry.getValue(), ""));}return bodyBuilder.build();}/*** 获取文件** @param multipartFile* @return*/public static File getFile(MultipartFile multipartFile) {File file = new File(Objects.requireNonNull(multipartFile.getOriginalFilename()));try {FileUtils.copyInputStreamToFile(multipartFile.getInputStream(), file);} catch (IOException e) {log.error("copyInputStreamToFile error.", e);}return file;}}