/*
* Copyright (C) 2012 www.amsoft.cn
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.andbase.util.download;
import java.io.File;
import java.net.HttpURLConnection;
import java.util.LinkedHashMap;
import java.util.Map;
import android.content.Context;
import android.os.Environment;
import com.ab.util.AbFileUtil;
import com.ab.util.AbLogUtil;
// TODO: Auto-generated Javadoc
/**
* 描述:多线程支持断点续传下载器.
*
* @author 还如一梦中
* @version v1.0
* @date:2013-3-14 下午5:00:52
*/
public class AbFileDownloader {
/** The context. */
private Context context;
/** The threads. */
private AbDownloadThread threads;
/** The m down file dao. */
private DownFileDao mDownFileDao;
/** 本地保存文件. */
private File saveFile;
/** The m down file. */
private DownFile mDownFile = null;
/** The m thread num. */
private int mThreadNum = 1;
/** The flag. */
private boolean flag = true;
/**
* 更新指定线程最后下载的位置.
*
* @param downFile the down file
*/
protected synchronized void update(DownFile downFile) {
this.mDownFileDao.update(downFile);
}
/**
* 构建文件下载器.
*
* @param context the context
* @param downFile the down file
* @param threadNum 下载线程数
*/
public AbFileDownloader(Context context,DownFile downFile,int threadNum) {
try {
this.context = context;
this.mDownFile = downFile;
this.mThreadNum = threadNum;
mDownFileDao = new DownFileDao(context);
// 构建保存文件
String fileName = AbFileUtil.getRealFileNameFromUrl(mDownFile.getDownUrl());
saveFile = new File(AbFileUtil.getFileDownloadDir(context)+fileName);
if (!saveFile.getParentFile().exists()){
saveFile.getParentFile().mkdirs();
}
if (!saveFile.exists()){
saveFile.createNewFile();
//删除原来的下载数据
mDownFileDao.delete(downFile.getDownUrl());
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 开始下载文件.
*
* @param listener 监听下载数量的变化,如果不需要了解实时下载的数量,可以设置为null
* @return 已下载文件大小
* @throws Exception the exception
*/
public void download(AbDownloadProgressListener listener) throws Exception {
try {
this.threads = new AbDownloadThread(this,mDownFile,saveFile);
this.threads.setPriority(7);
this.threads.start();
this.mDownFileDao.save(mDownFile);
// 循环判断所有线程是否完成下载
while (flag && mDownFile.getDownLength() <= mDownFile.getTotalLength()) {
Thread.sleep(2000);
// 如果下载失败,再重新下载
if (mDownFile.getDownLength() == -1) {
//下载失败
return;
}
// 没间隔几秒通知目前已经下载完成的数据长度
if (listener != null){
listener.onDownloadSize(mDownFile.getDownLength());
}
if(mDownFile.getDownLength() == mDownFile.getTotalLength()){
break;
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 获取Http响应头字段.
*
* @param http the http
* @return the http response header
*/
public static Map<String, String> getHttpResponseHeader(HttpURLConnection http) {
Map<String, String> header = new LinkedHashMap<String, String>();
for (int i = 0;; i++) {
String mine = http.getHeaderField(i);
if (mine == null)
break;
header.put(http.getHeaderFieldKey(i), mine);
}
return header;
}
/**
* 打印Http头字段.
*
* @param http the http
*/
public static void printResponseHeader(HttpURLConnection http) {
Map<String, String> header = getHttpResponseHeader(http);
for (Map.Entry<String, String> entry : header.entrySet()) {
String key = entry.getKey() != null ? entry.getKey() + ":" : "";
AbLogUtil.i(AbFileDownloader.class, key + entry.getValue());
}
}
/**
* Gets the threads.
*
* @return the threads
*/
public AbDownloadThread getThreads() {
return threads;
}
/**
* Gets the save file.
*
* @return the save file
*/
public File getSaveFile() {
return saveFile;
}
/**
* Gets the flag.
*
* @return the flag
*/
public boolean getFlag() {
return flag;
}
/**
* Sets the flag.
*
* @param flag the new flag
*/
public void setFlag(boolean flag) {
this.flag = flag;
}
}