public static void downLoadByUrl(String urlStr,String fileName,String savePath)throws IOException{
URL url =new URL(urlStr);
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
//设置超时间为3秒
conn.setConnectTimeout(5*1000);
//防止屏蔽程序抓取而返回403错误
conn.setRequestProperty("User-Agent","Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");
//得到输入流
InputStream inputStream = conn.getInputStream();
//获取自己数组
byte[] getData =readInputStream(inputStream);
//文件保存位置
File saveDir =new File(savePath);
if(!saveDir.exists()){
saveDir.mkdir();
}
File file =new File(saveDir+File.separator+fileName);
FileOutputStream fos =new FileOutputStream(file);
fos.write(getData);
if(fos!=null){
fos.close();
}
if(inputStream!=null){
inputStream.close();
}
System.out.println("info:"+url+" download success");
}
/**
* 从输入流中获取字节数组
* @param inputStream
* @return
* @throws IOException
*/
public static byte[] readInputStream(InputStream inputStream)throws IOException {
byte[] buffer =new byte[1024];
int len =0;
ByteArrayOutputStream bos =new ByteArrayOutputStream();
while((len = inputStream.read(buffer)) != -1) {
bos.write(buffer,0, len);
}
bos.close();
return bos.toByteArray();
}
