OkHttp 监听下载

package com.archser.accession.util;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Iterator;
import java.util.Map.Entry;
import java.util.concurrent.TimeUnit;

import com.jfinal.kit.Kv;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;

 

public class DownloadFileFromService {

	private static DownloadFileFromService downloadUtil;
	private final OkHttpClient okHttpClient;
	public static final long DEFAULT_READ_TIMEOUT_MILLIS = 60 * 1000;
	public static final long DEFAULT_WRITE_TIMEOUT_MILLIS = 60 * 1000;
	public static final long DEFAULT_CONNECT_TIMEOUT_MILLIS = 60 * 1000;

	public static DownloadFileFromService get() {
		if (downloadUtil == null) {
			downloadUtil = new DownloadFileFromService();
		}
		return downloadUtil;
	}

	public DownloadFileFromService() {
		okHttpClient = new OkHttpClient();
		okHttpClient.newBuilder()
		.connectTimeout(DEFAULT_READ_TIMEOUT_MILLIS, TimeUnit.MILLISECONDS)
		.writeTimeout(DEFAULT_WRITE_TIMEOUT_MILLIS, TimeUnit.MILLISECONDS)
		.readTimeout(DEFAULT_WRITE_TIMEOUT_MILLIS, TimeUnit.MILLISECONDS).build();
	}

	/**
	 * @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 onDownloadListener 
	 * @param listener     下载监听
	 */
	@SuppressWarnings("unchecked")
	public  boolean download(String url, Kv dataMap, String destFileDir, String destFileName, OnDownloadListener listener) {
		boolean flag = false;
		Iterator<Entry<String, String>> iterator = dataMap.entrySet().iterator();
		StringBuffer buffer = new StringBuffer();
		boolean isFirst = true;
		while (iterator.hasNext()) {
			Entry<String, String> next = iterator.next();
			if (isFirst) {
				buffer.append("?").append(next.getKey()).append("=").append(next.getValue());
				isFirst = false;
			} else {
				buffer.append("&").append(next.getKey()).append("=").append(next.getValue());
			}
		}
		Request request = new Request.Builder().addHeader("Accept-Encoding", "identity").url(url + buffer.toString()).build();
		// 异步请求
		okHttpClient.newCall(request).enqueue(new Callback() {
			@Override
			public void onFailure(Call call, IOException e) {
				// TODO Auto-generated method stub
			}

			@Override
			public void onResponse(Call call, Response response) throws IOException {
				InputStream is = null;
				byte[] buf = new byte[2048];
				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();
				}
				int progress = 0;
				File file = new File(dir, destFileName);
				try {
					 long sum = 0;
					 long total = response.body().contentLength();
					is = response.body().byteStream();
					fos = new FileOutputStream(file);
					while ((len = is.read(buf)) != -1) {
						fos.write(buf, 0, len);
						sum += len;
                        progress = (int) (sum * 1.0f / total * 100);
						listener.onDownloading(progress);
					}
					fos.flush();
					listener.onDownloadSuccess(file);
				} catch (Exception e) {
					e.printStackTrace();
					 listener.onDownloadFailed(e);
				} finally {
					try {
						if (is != null) {
							is.close();
						}
						if (fos != null) {
							fos.close();
						}
					} catch (IOException e) {
						e.printStackTrace();
					}
				}
			}
		});
		return !flag;
	}
	
	
	

	/**
	 * 调用下载方式，监听下载进程
	 *@Time:2020年4月7日 - 下午8:35:58
	 * @auto:李德才
	 * @param: @param url
	 * @param: @param dataMap
	 * @param: @param dir
	 * @param: @param fileName
	 * @param: @return      
	 * @return: boolean      
	 * @throws
	 */
	public static boolean  downFile(String url,Kv dataMap,String dir,String fileName) {
    	DownloadFileFromService.get().download(url, dataMap, dir,fileName,
                new DownloadFileFromService.OnDownloadListener() {
                    @Override
                    public void onDownloadSuccess(File file) {
                    }
 
                    @Override
                    public void onDownloading(int progress) {
                    }
 
                    @Override
                    public void onDownloadFailed(Exception e) {
                    System.err.println("下载失败 ------->" + e.getMessage());
                    }
                });
    	return false;
    }
	
	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);
    }

 
}

//调用
DownloadFileFromService.downFile();