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();
}