361 lines
15 KiB
Java
361 lines
15 KiB
Java
package com.arialyy.downloadutil;
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import android.content.Context;
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import android.support.annotation.NonNull;
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import android.util.Log;
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import android.util.SparseArray;
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import com.arialyy.downloadutil.inf.IDownloadListener;
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import java.io.File;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.RandomAccessFile;
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import java.net.HttpURLConnection;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.util.Properties;
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/**
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* Created by lyy on 2015/8/25.
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* 下载工具类
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*/
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public class DownLoadUtil {
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private static final String TAG = "DownLoadUtil";
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//下载监听
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private IDownloadListener mListener;
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/**
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* 线程数
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*/
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private static final int THREAD_NUM = 3;
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/**
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* 已经完成下载任务的线程数量
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*/
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private int mCompleteThreadNum = 0;
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private long mCurrentLocation;
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private boolean isDownloading = false;
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private boolean isStop = false;
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private boolean isCancel = false;
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private static final int TIME_OUT = 5000; //超时时间
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boolean newTask = true;
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private int mCancelNum = 0;
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private int mStopNum = 0;
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public DownLoadUtil() {
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}
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/**
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* 获取当前下载位置
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*
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* @return
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*/
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public long getCurrentLocation() {
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return mCurrentLocation;
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}
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public boolean isDownloading() {
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return isDownloading;
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}
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/**
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* 取消下载
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*/
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public void cancelDownload() {
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isCancel = true;
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}
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/**
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* 停止下载
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*/
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public void stopDownload() {
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isStop = true;
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}
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/**
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* 多线程断点续传下载文件，暂停和继续
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*
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* @param context 必须添加该参数，不能使用全局变量的context
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* @param downloadUrl 下载路径
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* @param filePath 保存路径
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* @param downloadListener 下载进度监听 {@link DownloadListener}
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*/
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public void download(final Context context, @NonNull final String downloadUrl, @NonNull final String filePath,
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@NonNull final DownloadListener downloadListener) {
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isDownloading = true;
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mCurrentLocation = 0;
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isStop = false;
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isCancel = false;
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mCancelNum = 0;
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mStopNum = 0;
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final File dFile = new File(filePath);
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//读取已完成的线程数
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final File configFile = new File(context.getFilesDir().getPath() + "/temp/" + dFile.getName() + ".properties");
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try {
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if (!configFile.exists()) { //记录文件被删除，则重新下载
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newTask = true;
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Util.createFile(configFile.getPath());
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} else {
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newTask = false;
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}
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} catch (Exception e) {
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e.printStackTrace();
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mListener.onFail();
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return;
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}
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newTask = !dFile.exists();
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new Thread(new Runnable() {
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@Override
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public void run() {
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try {
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mListener = downloadListener;
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URL url = new URL(downloadUrl);
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HttpURLConnection conn = (HttpURLConnection) url.openConnection();
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conn.setRequestMethod("GET");
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conn.setRequestProperty("Charset", "UTF-8");
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conn.setConnectTimeout(TIME_OUT);
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conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)");
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conn.setRequestProperty("Accept", "image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*");
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conn.connect();
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int len = conn.getContentLength();
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if (len < 0) { //网络被劫持时会出现这个问题
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mListener.onFail();
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return;
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}
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int code = conn.getResponseCode();
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if (code == 200) {
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int fileLength = conn.getContentLength();
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//必须建一个文件
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Util.createFile(filePath);
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RandomAccessFile file = new RandomAccessFile(filePath, "rwd");
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//设置文件长度
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file.setLength(fileLength);
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mListener.onPreDownload(conn);
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//分配每条线程的下载区间
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Properties pro = null;
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pro = Util.loadConfig(configFile);
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int blockSize = fileLength / THREAD_NUM;
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SparseArray<Thread> tasks = new SparseArray<>();
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for (int i = 0; i < THREAD_NUM; i++) {
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long startL = i * blockSize, endL = (i + 1) * blockSize;
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Object state = pro.getProperty(dFile.getName() + "_state_" + i);
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if (state != null && Integer.parseInt(state + "") == 1) { //该线程已经完成
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mCurrentLocation += endL - startL;
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Log.d(TAG, "++++++++++ 线程_" + i + "_已经下载完成 ++++++++++");
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mCompleteThreadNum++;
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if (mCompleteThreadNum == THREAD_NUM) {
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if (configFile.exists()) {
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configFile.delete();
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}
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mListener.onComplete();
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isDownloading = false;
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System.gc();
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return;
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}
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continue;
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}
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//分配下载位置
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Object record = pro.getProperty(dFile.getName() + "_record_" + i);
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if (!newTask && record != null && Long.parseLong(record + "") > 0) { //如果有记录，则恢复下载
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Long r = Long.parseLong(record + "");
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mCurrentLocation += r - startL;
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Log.d(TAG, "++++++++++ 线程_" + i + "_恢复下载 ++++++++++");
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mListener.onChildResume(r);
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startL = r;
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}
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if (i == (THREAD_NUM - 1)) {
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endL = fileLength;//如果整个文件的大小不为线程个数的整数倍，则最后一个线程的结束位置即为文件的总长度
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}
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DownloadEntity entity = new DownloadEntity(context, fileLength, downloadUrl, dFile, i, startL, endL);
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DownLoadTask task = new DownLoadTask(entity);
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tasks.put(i, new Thread(task));
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}
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if (mCurrentLocation > 0) {
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mListener.onResume(mCurrentLocation);
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} else {
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mListener.onStart(mCurrentLocation);
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}
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for (int i = 0, count = tasks.size(); i < count; i++) {
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Thread task = tasks.get(i);
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if (task != null) {
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task.start();
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}
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}
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} else {
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Log.e(TAG, "下载失败，返回码：" + code);
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isDownloading = false;
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System.gc();
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mListener.onFail();
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}
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} catch (IOException e) {
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Log.e(TAG, "下载失败【downloadUrl:" + downloadUrl + "】\n【filePath:" + filePath + "】" + Util.getPrintException(e));
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isDownloading = false;
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mListener.onFail();
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}
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}
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}).start();
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}
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/**
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* 多线程下载任务类,不能使用AsyncTask来进行多线程下载，因为AsyncTask是串行执行的，这种方式下载速度太慢了
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*/
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private class DownLoadTask implements Runnable {
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private static final String TAG = "DownLoadTask";
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private DownloadEntity dEntity;
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private String configFPath;
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public DownLoadTask(DownloadEntity downloadInfo) {
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this.dEntity = downloadInfo;
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configFPath = dEntity.context.getFilesDir().getPath() + "/temp/" + dEntity.tempFile.getName() + ".properties";
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}
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@Override
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public void run() {
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try {
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Log.d(TAG, "线程_" + dEntity.threadId + "_正在下载【" + "开始位置 : " + dEntity.startLocation + "，结束位置：" + dEntity.endLocation + "】");
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URL url = new URL(dEntity.downloadUrl);
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HttpURLConnection conn = (HttpURLConnection) url.openConnection();
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//在头里面请求下载开始位置和结束位置
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conn.setRequestProperty("Range", "bytes=" + dEntity.startLocation + "-" + dEntity.endLocation);
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conn.setRequestMethod("GET");
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conn.setRequestProperty("Charset", "UTF-8");
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conn.setConnectTimeout(TIME_OUT);
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conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 5.2; Trident/4.0; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729)");
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conn.setRequestProperty("Accept", "image/gif, image/jpeg, image/pjpeg, image/pjpeg, application/x-shockwave-flash, application/xaml+xml, application/vnd.ms-xpsdocument, application/x-ms-xbap, application/x-ms-application, application/vnd.ms-excel, application/vnd.ms-powerpoint, application/msword, */*");
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conn.setReadTimeout(2000); //设置读取流的等待时间,必须设置该参数
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InputStream is = conn.getInputStream();
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//创建可设置位置的文件
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RandomAccessFile file = new RandomAccessFile(dEntity.tempFile, "rwd");
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//设置每条线程写入文件的位置
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file.seek(dEntity.startLocation);
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byte[] buffer = new byte[1024];
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int len;
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//当前子线程的下载位置
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long currentLocation = dEntity.startLocation;
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while ((len = is.read(buffer)) != -1) {
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if (isCancel) {
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Log.d(TAG, "++++++++++ thread_" + dEntity.threadId + "_cancel ++++++++++");
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break;
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}
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if (isStop) {
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break;
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}
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//把下载数据数据写入文件
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file.write(buffer, 0, len);
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synchronized (DownLoadUtil.this) {
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mCurrentLocation += len;
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mListener.onProgress(mCurrentLocation);
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}
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currentLocation += len;
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}
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file.close();
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is.close();
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if (isCancel) {
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synchronized (DownLoadUtil.this) {
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mCancelNum++;
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if (mCancelNum == THREAD_NUM) {
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File configFile = new File(configFPath);
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if (configFile.exists()) {
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configFile.delete();
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}
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if (dEntity.tempFile.exists()) {
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dEntity.tempFile.delete();
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}
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Log.d(TAG, "++++++++++++++++ onCancel +++++++++++++++++");
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isDownloading = false;
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mListener.onCancel();
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System.gc();
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}
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}
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return;
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}
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//停止状态不需要删除记录文件
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if (isStop) {
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synchronized (DownLoadUtil.this) {
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mStopNum++;
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String location = String.valueOf(currentLocation);
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Log.i(TAG, "thread_" + dEntity.threadId + "_stop, stop location ==> " + currentLocation);
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writeConfig(dEntity.tempFile.getName() + "_record_" + dEntity.threadId, location);
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if (mStopNum == THREAD_NUM) {
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Log.d(TAG, "++++++++++++++++ onStop +++++++++++++++++");
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isDownloading = false;
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mListener.onStop(mCurrentLocation);
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System.gc();
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}
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}
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return;
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}
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Log.i(TAG, "线程【" + dEntity.threadId + "】下载完毕");
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writeConfig(dEntity.tempFile.getName() + "_state_" + dEntity.threadId, 1 + "");
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mListener.onChildComplete(dEntity.endLocation);
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mCompleteThreadNum++;
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if (mCompleteThreadNum == THREAD_NUM) {
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File configFile = new File(configFPath);
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if (configFile.exists()) {
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configFile.delete();
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}
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mListener.onComplete();
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isDownloading = false;
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System.gc();
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}
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} catch (MalformedURLException e) {
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e.printStackTrace();
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isDownloading = false;
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mListener.onFail();
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} catch (IOException e) {
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Log.e(TAG, "下载失败【" + dEntity.downloadUrl + "】" + Util.getPrintException(e));
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isDownloading = false;
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mListener.onFail();
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} catch (Exception e) {
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Log.e(TAG, "获取流失败" + Util.getPrintException(e));
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isDownloading = false;
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mListener.onFail();
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}
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}
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/**
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* 将记录写入到配置文件
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*
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* @param record
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*/
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private void writeConfig(String key, String record) throws IOException {
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File configFile = new File(configFPath);
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Properties pro = Util.loadConfig(configFile);
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pro.setProperty(key, record);
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Util.saveConfig(configFile, pro);
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}
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}
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/**
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* 子线程下载信息类
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*/
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private class DownloadEntity {
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//文件大小
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long fileSize;
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String downloadUrl;
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int threadId;
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long startLocation;
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long endLocation;
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File tempFile;
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Context context;
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public DownloadEntity(Context context, long fileSize, String downloadUrl, File file, int threadId, long startLocation, long endLocation) {
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this.fileSize = fileSize;
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this.downloadUrl = downloadUrl;
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this.tempFile = file;
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this.threadId = threadId;
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this.startLocation = startLocation;
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this.endLocation = endLocation;
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this.context = context;
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}
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}
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}
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