Java使用okhttp发送get、post请求

一、添加依赖

<dependency>
    <groupId>com.squareup.okhttp3</groupId>
    <artifactId>okhttp</artifactId>
    <version>4.4.1</version>
</dependency>

二、封装请求工具类

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;
import okhttp3.*;

import java.io.IOException;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@SuppressWarnings("all")
@Slf4j
public class OkHttpUtils {

    /**
     * 发送get请求
     *
     * @param url
     * @param params
     * @param tClass
     * @return <T>
     */
    public static <T> T getRequest(String url, Map<String, Object> params, Class<T> tClass) {
        // 超时时间为60s
        OkHttpClient client = new OkHttpClient.Builder()
                .connectTimeout(60, TimeUnit.SECONDS) // connect timeout
                .readTimeout(60, TimeUnit.SECONDS) // socket timeout
                .build();
        HttpUrl.Builder httpBuilder = HttpUrl.parse(url).newBuilder();
        if (params != null) {
            params.forEach((k, v) -> httpBuilder.addQueryParameter(k, (String) v));
        }
        Request request = new Request.Builder()
                .url(httpBuilder.build())
                .get()
                .addHeader("Content-Type", "application/x-www-form-urlencoded")
                .build();
        try {
            Response response = client.newCall(request).execute();
            if (response.isSuccessful()) {
                String string = response.body().string();
                log.info("响应结果:" + string);
                return JSON.parseObject(string, tClass);
            } else {
                log.error("未知错误:" + response);
                throw new IOException("未知错误！");
            }
        } catch (IOException e) {
            log.error(e.getMessage(), e);
            throw new RuntimeException(e.getMessage());
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            throw new RuntimeException("系统错误！");
        }
    }

    /**
     * 发送post请求，参数为json格式
     *
     * @param url
     * @param params
     * @param tClass
     * @return <T>
     */
    public static <T> T postRequest(String url, Map<String, Object> params, Class<T> tClass) {
        return postRequest(url, null, params, tClass);
    }

    /**
     * 发送post请求，参数为json格式
     *
     * @param url
     * @param headers
     * @param params
     * @param tClass
     * @return <T>
     */
    public static <T> T postRequest(String url, Map<String, Object> headers, Map<String, Object> params, Class<T> tClass) {
        OkHttpClient client = new OkHttpClient.Builder()
                .connectTimeout(60, TimeUnit.SECONDS)
                .readTimeout(60, TimeUnit.SECONDS)
                .build();
        MediaType type = MediaType.parse("application/json;charset=utf-8");
        JSONObject json = new JSONObject();
        if (params != null) {
            params.forEach((k, v) -> json.put(k, v));
        }
        RequestBody requestBody = RequestBody.create(type, String.valueOf(json));
        Request.Builder requestBuilder = new Request.Builder();
        if (headers != null) {
            headers.forEach((k, v) -> requestBuilder.addHeader(k, (String) v));
        }
        Request request = requestBuilder
                .url(url)
                .post(requestBody)
                .addHeader("Content-Type", "application/json;charset=utf-8")
                .build();
        try {
            Response response = client.newCall(request).execute();
            if (response.isSuccessful()) {
                String string = response.body().string();
                log.info("响应结果:" + string);
                return JSON.parseObject(string, tClass);
            } else {
                log.error("未知错误:" + response);
                throw new IOException("未知错误！");
            }
        } catch (IOException e) {
            log.error(e.getMessage(), e);
            throw new RuntimeException(e.getMessage());
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            throw new RuntimeException("系统错误！");
        }
    }

}