Android 开发工具类 26_getFile

从网络获取可执行文件

 public void getFile() throws Exception{

     // 首先得到请求的路径
     String  urlpath = "http://ftpcnc-js.pconline.com.cn/pub/download/201003/Fetioon_3.6.1900.exe";
     URL  url = new URL(urlpath);
     HttpURLConnection  conn = (HttpURLConnection)url.openConnection();
     conn.setRequestMethod("GET");
     conn.setConnectTimeout(6*1000);
     if(conn.getResponseCode() == 200){
         InputStream  inputStream = conn.getInputStream();
         byte[]  data = readInstream(inputStream);
         File  file = new File("feixin.exe");
         FileOutputStream  outputStream = new FileOutputStream(file);
         outputStream.write(data);
         outputStream.close();
     }
 }

readInstream

 // 读取流文件的内容
 public  byte[] readInstream(InputStream inputStream) throws Exception{

     ByteArrayOutputStream  byteArrayOutputStream =
             new  ByteArrayOutputStream();
     byte[] buffer = new byte[1024];
     int length = -1;
     while((length = inputStream.read(buffer)) != -1){
         byteArrayOutputStream.write(buffer, 0, length);
     }
     byteArrayOutputStream.close();
     inputStream.close();
     return  byteArrayOutputStream.toByteArray();
 }