OkHttp工具类 简单封装Post、Get、上传、下载

该工具类都是同步请求简单的封装了下OkHttp

maven依赖

    com.alibaba
    fastjson
    1.2.47



    log4j
    log4j
    1.2.17



    org.slf4j
    slf4j-log4j12
    1.7.2



    com.squareup.okhttp3
    okhttp
    3.6.0



    org.projectlombok
    lombok
    1.16.18

工具类

import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import okhttp3.*;
import okio.BufferedSink;
import okio.Okio;
import java.io.File;
import java.util.HashMap;
import java.util.Map;

@Slf4j
public class OkHttpUtil {

    /**
     * Get请求
     * @param url   URL地址
     * @return  返回结果
     */
    public static String get(String url){
        String result=null;
        try {
            OkHttpClient okHttpClient=new OkHttpClient();
            Request request = new Request.Builder().url(url).build();
            Response response = okHttpClient.newCall(request).execute();
            result=response.body().string();
            log.info("Get请求返回：{}",result);
            return result;
        }catch (Exception e){
            log.error("OkHttp[Get]请求异常",e);
            return result;
        }
    }

    /**
     * Post请求
     * @param url       URL地址
     * @param params    参数
     * @return  返回结果
     */
    public static String post(String url,Map params){
        String result=null;
        if (params==null){
            params=new HashMap();
        }
        try {
            OkHttpClient okHttpClient=new OkHttpClient();
            FormBody.Builder formBodyBuilder = new FormBody.Builder();
            //添加参数
            log.info("params：{}", JSON.toJSONString(params));
            for (Map.Entry map:params.entrySet()){
                String key=map.getKey();
                String value;
                if (map.getValue()==null){
                    value="";
                }else{
                    value=map.getValue();
                }
                formBodyBuilder.add(key,value);
            }
            FormBody formBody =formBodyBuilder.build();
            Request request = new Request.Builder().url(url).post(formBody).build();
            Response response = okHttpClient.newCall(request).execute();
            result=response.body().string();
            log.info("Post请求返回：{}",result);
            return result;
        }catch (Exception e){
            log.error("OkHttp[Post]请求异常",e);
            return result;
        }
    }

    /**
     * 上传文件请求（Post请求）
     * @param url       URL地址
     * @param params    文件 key：参数名 value：文件 （可以多文件）
     * @return  返回结果
     */
    public static String upload(String url, Map params){
        String result=null;
        try {
            OkHttpClient okHttpClient=new OkHttpClient();
            MultipartBody.Builder multipartBodyBuilder =new MultipartBody.Builder().setType(MultipartBody.FORM);

            for (Map.Entry map:params.entrySet()){
                String key=map.getKey();
                File file=map.getValue();
                if (file==null||(file.exists() && file.length() == 0)){
                    continue;
                }
                multipartBodyBuilder.addFormDataPart(key,file.getName(),RequestBody.create(MediaType.parse("multipart/form-data"), file));
            }
            RequestBody requestBody =multipartBodyBuilder.build();
            Request request = new Request.Builder().url(url).post(requestBody).build();
            Response response = okHttpClient.newCall(request).execute();
            result=response.body().string();
            log.info("Upload请求返回：{}",result);
            return result;
        }catch (Exception e){
            log.error("OkHttp[Upload]请求异常",e);
            return result;
        }
    }

    /**
     * 下载文件请求（Get请求）
     * @param url       URL地址
     * @param savePath  保存路径（包括文件名）
     * @return  文件保存路径
     */
    public static String download(String url,String savePath){
        String result=null;
        try {
            OkHttpClient okHttpClient=new OkHttpClient();
            Request request = new Request.Builder().url(url).build();
            Response response = okHttpClient.newCall(request).execute();
            File file=new File(savePath);
            if (!file.getParentFile().exists()){
                file.getParentFile().mkdirs();
            }
            BufferedSink sink =Okio.buffer((Okio.sink(file)));
            sink.writeAll(response.body().source());
            sink.flush();
            sink.close();
            result=savePath;
            log.info("Download请求返回：{}",result);
            return result;
        }catch (Exception e){
            log.error("OkHttp[Download]请求异常",e);
            return result;
        }
    }

}