okhttp同步异步下载文件，与http请求工具类

 <dependency>
            <groupId>com.squareup.okhttp3</groupId>
            <artifactId>okhttp</artifactId>
            <version>4.8.0</version>
        </dependency>

ok:
  http:
    connect-timeout: 30
    read-timeout: 30
    write-timeout: 30
    keep-alive-duration: 60
    max-idle-connections: 3

import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.concurrent.TimeUnit;

import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import okhttp3.ConnectionPool;
import okhttp3.OkHttpClient;


@Configuration
public class OkHttpConfig {

    @Value("${ok.http.connect-timeout}")
    private Integer connectTimeout;

    @Value("${ok.http.read-timeout}")
    private Integer readTimeout;

    @Value("${ok.http.write-timeout}")
    private Integer writeTimeout;

    @Value("${ok.http.max-idle-connections}")
    private Integer maxIdleConnections;

    @Value("${ok.http.keep-alive-duration}")
    private Long keepAliveDuration;

    @Bean
    public OkHttpClient okHttpClient() {
        return new OkHttpClient.Builder()
                .sslSocketFactory(sslSocketFactory(), x509TrustManager())
                // 是否开启缓存
                .retryOnConnectionFailure(false)
                //连接池
                .connectionPool(pool())
                .connectTimeout(connectTimeout, TimeUnit.SECONDS)
                .readTimeout(readTimeout, TimeUnit.SECONDS)
                .writeTimeout(writeTimeout,TimeUnit.SECONDS)
                .hostnameVerifier((hostname, session) -> true)
                // 设置代理
//                .proxy(new Proxy(Proxy.Type.HTTP, new InetSocketAddress("127.0.0.1", 8888)))
                // 拦截器
//                .addInterceptor()
                .build();
    }

    @Bean
    public X509TrustManager x509TrustManager() {
        return new X509TrustManager() {
            @Override
            public void checkClientTrusted(X509Certificate[] chain, String authType)
                    throws CertificateException {
            }
            @Override
            public void checkServerTrusted(X509Certificate[] chain, String authType)
                    throws CertificateException {
            }
            @Override
            public X509Certificate[] getAcceptedIssuers() {
                return new X509Certificate[0];
            }
        };
    }

    @Bean
    public SSLSocketFactory sslSocketFactory() {
        try {
            // 信任任何链接
            SSLContext sslContext = SSLContext.getInstance("TLS");
            sslContext.init(null, new TrustManager[]{x509TrustManager()}, new SecureRandom());
            return sslContext.getSocketFactory();
        } catch (NoSuchAlgorithmException | KeyManagementException e) {
            e.printStackTrace();
        }
        return null;
    }

    @Bean
    public ConnectionPool pool() {
        return new ConnectionPool(maxIdleConnections, keepAliveDuration, TimeUnit.SECONDS);
    }
}

 //异步下载
downloadUtil.downloadByAsync("http://xxx.xxx.xxx/abc.zip", 
                 "e://test//", "abc.zip", new DownloadUtil.OnDownloadListener() {
             @Override
             public void onDownloadSuccess(File file) {
                 log.info("下载完成");
             }

             @Override
             public void onDownloading(int progress) {
                 log.info("下载进行中"+progress);
//                 progressDialog.setProgress(progress);
             }

             @Override
             public void onDownloadFailed(Exception e) {
                 //下载异常进行相关提示操作
                 log.error("下载出错", e);
             }
         });
         
         //同步下载
         downloadUtil.downloadBySysc("http://xxx.xxx.xxx.xxx/abc.zip", 
                  "e://test//", "abc.zip");

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import lombok.extern.slf4j.Slf4j;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import okio.BufferedSink;
import okio.Okio;
import okio.Sink;

/**
* 文件下载工具类（单例模式）
*/
@Component
@Slf4j
public class DownloadUtil {

    @Autowired
    private OkHttpClient okHttpClient;
    

   /**
    * @param url          下载连接
    * @param destFileDir  下载的文件储存目录
    * @param destFileName 下载文件名称，后面记得拼接后缀，否则手机没法识别文件类型
    * @param listener     下载监听
    */

   public interface OnDownloadListener{

       /**
        * 下载成功之后的文件
        */
       void onDownloadSuccess(File file);

       /**
        * 下载进度
        */
       void onDownloading(int progress);

       /**
        * 下载异常信息
        */

       void onDownloadFailed(Exception e);
   }
   
   public void downloadBySink(final String url, final String destFileDir, final String destFileName, final OnDownloadListener listener) {

       Request request = new Request.Builder()
               .url(url)
               .build();

       //异步请求
       okHttpClient.newCall(request).enqueue(new Callback() {
           @Override
           public void onFailure(Call call, IOException e) {
               // 下载失败监听回调
               listener.onDownloadFailed(e);
           }

           @Override
           public void onResponse(Call call, Response response) throws IOException {
               //储存下载文件的目录
               File dir = new File(destFileDir);
               if (!dir.exists()) {
                   dir.mkdirs();
               }
               File file = new File(dir, destFileName);
               Sink sink = null;
               BufferedSink bufferedSink = null;
               try {
                   sink = Okio.sink(file);
                   bufferedSink = Okio.buffer(sink);
                   bufferedSink.writeAll(response.body().source());
                   bufferedSink.close();
                   listener.onDownloadSuccess(file);
               } catch (Exception e) {
                   log.error("error:{}", e);
                   listener.onDownloadFailed(e);
               }finally {
                   if(bufferedSink != null){
                       bufferedSink.close();
                   }
               }
           }
       });
   }

   public void downloadByAsync(final String url, final String destFileDir, final String destFileName, final OnDownloadListener listener) {
       Request request = new Request.Builder()
               .url(url)
               .build();
       //异步请求
       okHttpClient.newCall(request).enqueue(new Callback() {
           @Override
           public void onFailure(Call call, IOException e) {
               // 下载失败监听回调
               listener.onDownloadFailed(e);
           }

            @Override
            public void onResponse(Call call, Response response) throws IOException {
                InputStream is = null;
                byte[] buf = new byte[4096];
                int len = 0;
                FileOutputStream fos = null;

                // 储存下载文件的目录
                File dir = new File(destFileDir);
                if (!dir.exists()) {
                    dir.mkdirs();
                }
                File file = new File(dir, destFileName);

                try {
                    is = response.body().byteStream();
                    fos = new FileOutputStream(file);
                    int size = 0;
                    long total = response.body().contentLength();
                    while ((size = is.read(buf)) != -1) {
                        len += size;
                        fos.write(buf, 0, size);
                        int process = (int) Math.floor(((double) len / total) * 100);
                        // 控制台打印文件下载的百分比情况
                        listener.onDownloading(process);
                    }

                    fos.flush();
                    // 下载完成
                    listener.onDownloadSuccess(file);
                } catch (Exception e) {
                    log.error("error:{}", e);
                    listener.onDownloadFailed(e);
                } finally {
                    if (is != null) {
                        try {
                            is.close();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }
                    if (fos != null) {
                        try {
                            fos.close();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                    }

                }

            }
       });
   }
   
    public void downloadBySysc(final String url, final String destFileDir, final String destFileName) {
        Request request = new Request.Builder().url(url).build();
        // 异步请求
        Response response = null;
        InputStream is = null;
        byte[] buf = new byte[4096];
        int len = 0;
        FileOutputStream fos = null;

        try {
            response = okHttpClient.newCall(request).execute();

            if (response.isSuccessful()) {

                // 储存下载文件的目录
                File dir = new File(destFileDir);
                if (!dir.exists()) {
                    dir.mkdirs();
                }
                File file = new File(dir, destFileName);

                is = response.body().byteStream();
                fos = new FileOutputStream(file);
                int size = 0;
                long total = response.body().contentLength();
                while ((size = is.read(buf)) != -1) {
                    len += size;
                    fos.write(buf, 0, size);
                    int process = (int) Math.floor(((double) len / total) * 100);
                    log.info("下载进度" + process);
                }
                fos.flush();
            } else {
                throw new IOException("Unexpected code " + response);
            }
        } catch (IOException e) {
            log.error("error:{}", e);
            e.printStackTrace();
        } finally {
            if (is != null) {
                try {
                    is.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (fos != null) {
                try {
                    fos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

        }
    }
   
   
}

import java.util.Map;

import org.apache.commons.lang3.exception.ExceptionUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import lombok.extern.slf4j.Slf4j;
import okhttp3.FormBody;
import okhttp3.MediaType;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.RequestBody;
import okhttp3.Response;


@Slf4j
@Component
public class OkHttpUtil {
    private static final MediaType JSON = MediaType.parse("application/json; charset=utf-8");
    private static final MediaType XML = MediaType.parse("application/xml; charset=utf-8");

    @Autowired
    private OkHttpClient okHttpClient;

    /**
     * get 请求
     * @param url       请求url地址
     * @return string
     * */
    public String doGet(String url) {
        return doGet(url, null, null);
    }


    /**
     * get 请求
     * @param url       请求url地址
     * @param params    请求参数 map
     * @return string
     * */
    public String doGet(String url, Map<String, String> params) {
        return doGet(url, params, null);
    }

    /**
     * get 请求
     * @param url       请求url地址
     * @param headers   请求头字段 {k1, v1 k2, v2, ...}
     * @return string
     * */
    public String doGet(String url, String[] headers) {
        return doGet(url, null, headers);
    }


    /**
     * get 请求
     * @param url       请求url地址
     * @param params    请求参数 map
     * @param headers   请求头字段 {k1, v1 k2, v2, ...}
     * @return string
     * */
    public String doGet(String url, Map<String, String> params, String[] headers) {
        StringBuilder sb = new StringBuilder(url);
        if (params != null && params.keySet().size() > 0) {
            boolean firstFlag = true;
            for (String key : params.keySet()) {
                if (firstFlag) {
                    sb.append("?").append(key).append("=").append(params.get(key));
                    firstFlag = false;
                } else {
                    sb.append("&").append(key).append("=").append(params.get(key));
                }
            }
        }

        Request.Builder builder = new Request.Builder();
        if (headers != null && headers.length > 0) {
            if (headers.length % 2 == 0) {
                for (int i = 0; i < headers.length; i = i + 2) {
                    builder.addHeader(headers[i], headers[i + 1]);
                }
            } else {
                log.warn("headers's length[{}] is error.", headers.length);
            }

        }

        Request request = builder.url(sb.toString()).build();
        log.info("do get request and url[{}]", sb.toString());
        return execute(request);
    }

    /**
     * post 请求
     * @param url       请求url地址
     * @param params    请求参数 map
     * @return string
     */
    public String doPost(String url, Map<String, String> params) {
        FormBody.Builder builder = new FormBody.Builder();

        if (params != null && params.keySet().size() > 0) {
            for (String key : params.keySet()) {
                builder.add(key, params.get(key));
            }
        }
        Request request = new Request.Builder().url(url).post(builder.build()).build();
        log.info("do post request and url[{}]", url);

        return execute(request);
    }


    /**
     * post 请求, 请求数据为 json 的字符串
     * @param url       请求url地址
     * @param json      请求数据, json 字符串
     * @return string
     */
    public String doPostJson(String url, String json) {
        log.info("do post request and url[{}]", url);
        return exectePost(url, json, JSON);
    }

    /**
     * post 请求, 请求数据为 xml 的字符串
     * @param url       请求url地址
     * @param xml       请求数据, xml 字符串
     * @return string
     */
    public String doPostXml(String url, String xml) {
        log.info("do post request and url[{}]", url);
        return exectePost(url, xml, XML);
    }


    private String exectePost(String url, String data, MediaType contentType) {
        RequestBody requestBody = RequestBody.create(contentType, data);
        Request request = new Request.Builder().url(url).post(requestBody).build();

        return execute(request);
    }

    private String execute(Request request) {
        Response response = null;
        try {
            response = okHttpClient.newCall(request).execute();
            if (response.isSuccessful()) {
                return response.body().string();
            }
        } catch (Exception e) {
            log.error(ExceptionUtils.getStackTrace(e));
        } finally {
            if (response != null) {
                response.close();
            }
        }
        return "";
    }

    
}