1 package unit;
2
3 import java.io.ByteArrayOutputStream;
4 import java.io.File;
5 import java.io.FileOutputStream;
6 import java.io.InputStream;
7 import java.math.BigDecimal;
8 import java.net.URL;
9 import java.net.URLConnection;
10 import java.util.ArrayList;
11 import java.util.Collections;
12 import java.util.concurrent.ExecutorService;
13 import java.util.concurrent.Executors;
14
15 /**
16 * 文件下载
17 */
18 public class HttpUtils {
19 static long sumContent = 0;
20 static float useTime = 0;
21 ArrayList<Float> speed = new ArrayList<Float>();
22 public static void main(String[] args) {
23 String url ="http://xcy1.xiaoshikd.com/python3.zip\r\n";
24 String dirPath = "D:/111/downLoad/";
25 String dirPath2 = "D:/222/downLoad/";
26 String dirPath3 = "D:/333/downLoad/";
27 HttpUtils.download(url, dirPath, "============");
28 HttpUtils.download(url, dirPath2, "============================");
29 HttpUtils.download(url, dirPath3, "==============================================");
30 }
31
32 public static void download(String url, String filePath, final String message) {
33 HttpUtils.getInstance().download(url, filePath, new HttpClientDownLoadProgress() {
34 @Override
35 public void onProgress(int progress) {
36 System.out.println("download progress "+message+ progress+"%");
37 }
38 });
39 }
40
41 /**
42 * 最大线程池
43 */
44 public static final int THREAD_POOL_SIZE = 4;
45
46 public interface HttpClientDownLoadProgress {
47 public void onProgress(int progress);
48 }
49
50 private static HttpUtils httpClientDownload;
51
52 private ExecutorService downloadExcutorService;
53
54 private HttpUtils() {
55 downloadExcutorService = Executors.newFixedThreadPool(THREAD_POOL_SIZE);
56 }
57
58 public static HttpUtils getInstance() {
59 if (httpClientDownload == null) {
60 httpClientDownload = new HttpUtils();
61 }
62 return httpClientDownload;
63 }
64
65 /**
66 * 下载文件
67 *
68 * @param url
69 * @param filePath
70 * @param progress
71 * 进度回调
72 */
73 public void download(final String url, final String filePath, final HttpClientDownLoadProgress progress) {
74 downloadExcutorService.execute(new Runnable() {
75 @Override
76 public void run() {
77 httpDownloadFile(url, filePath, progress);
78 }
79 });
80 }
81
82 /**
83 * 下载文件
84 * @param url
85 * @param filePath
86 */
87 private void httpDownloadFile(String strUrl, String filePath, HttpClientDownLoadProgress progress) {
88 try {
89 long startTime = System.currentTimeMillis();
90 URL url = new URL(strUrl);
91 String file = url.getFile();
92 String fileName = file.substring(file.lastIndexOf('/')+1);
93 URLConnection conn = url.openConnection();
94 InputStream is = conn.getInputStream();
95 long contentLength = conn.getContentLength();
96 ByteArrayOutputStream output = new ByteArrayOutputStream();
97 byte[] buffer = new byte[65536];
98 int r = 0;
99 long totalRead = 0;
100 while ((r = is.read(buffer)) > 0) {
101 output.write(buffer, 0, r);
102 totalRead += r;
103 sumContent+=r;
104 if (progress != null) {// 回调进度
105 progress.onProgress((int) (totalRead * 100 / contentLength));
106 }
107 }
108
109 /**
110 * 将下载文件写入本地
111 */
112 File f = new File(filePath);
113 if(!f.exists()) {
114 f.mkdirs();
115 }
116 filePath = filePath+fileName;
117 FileOutputStream fos = new FileOutputStream(filePath);
118 output.writeTo(fos);
119 output.flush();
120
121 Long endTime = System.currentTimeMillis();
122 useTime = (float)(endTime-startTime)/1000;
123 getDoloadResult(sumContent, useTime);
124
125 output.close();
126 fos.close();
127 is.close();
128 downloadExcutorService.shutdown();
129 } catch (Exception e) {
130 e.printStackTrace();
131 downloadExcutorService.shutdown();
132 }
133 }
134
135 public void getDoloadResult(long contentLength, float useTime) {
136 System.out.println("sumContentLength： "+contentLength);
137 System.out.println("useTime： "+useTime);
138
139 float bySpead = contentLength/useTime/1024/1024;
140 BigDecimal b = new BigDecimal(bySpead);
141 bySpead = b.setScale(2, 4).floatValue();;
142 speed.add(bySpead);
143 System.out.println("avgSpeed: "+bySpead+" M/s");
144 System.out.println("maxSpeed: "+Collections.max(speed)+" M/s");
145 }
146 }
