思路是:第一获取要下载文件的大小,设为X,第二通过多线程监测已下载文件的大小,设为Y,Y/x就是下载的进度。关键代码如下
//获取要下载的object的metadata
ObjectMetadata tmpMetadata = client.getObjectMetadata(bucketName, key);
final long filesize = tmpMetadata.getContentLength();
final File downloadFile = new File(filename);
Thread t = new Thread(new Runnable() {
@Override
public void run() {
while(true){
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(downloadFile.getName()+"下载的进度为:"+ (float)downloadFile.length()*100/filesize);
if(downloadFile.length()==filesize)
break;
}
}
});
t.start();
//下载object
ObjectMetadata result =client.getObject(new GetObjectRequest(bucketName, key),downloadFile);