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public static void downFile(final String url){
new Thread(){
public void run(){
FileOutputStream s=null;
try{
InputStream input=null;
URLConnection httpUrlConnection= new URL(url).openConnection();
//int contentLength = httpUrlConnection.getContentLength();
input =httpUrlConnection.getInputStream();
File file = new File("C:\\Users\\Administrator\\Desktop\\Apknew.apk");
//如果目标文件已经存在，则删除，
android下文件下载
，电脑资料
《android下文件下载》(https://www.unjs.com)。产生覆盖旧文件的效果if(file.exists())
{
file.delete();
}
s = new FileOutputStream(file);
byte[] buffer = new byte[4*1024];
// 读取到的数据长度
int len;
while((len=input.read(buffer)) != -1){
os.write(buffer,0,len); //这里不能写成os.write(buffer)
}
os.flush();
os.close();
input.close();//这里一定不能忘记关闭输入流
//Log.v("cmd", "文件下载完毕,路径为："+file.getAbsolutePath());
//update();
System.out.println("下载完毕");
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally{
}
}
}.start();
}