android连接 服务器失败怎么办,android客户端程序连接服务器总是失败，出现IOException...

服务器失败怎么办,android客户端程序连接服务器总是失败，出现IOException..."/>

android连接 服务器失败怎么办,android客户端程序连接服务器总是失败，出现IOException...

下面这段代码在程序中运行出现IOException

/**

* 下载线程

*/

private Runnable runnable = new Runnable() {

@Override

public void run() {

// TODO Auto-generated method stub

try {

URL url = new URL(apkUrl);

HttpURLConnection conn = (HttpURLConnection) url

.openConnection();

conn.connect();

int length = conn.getContentLength();

InputStream is = conn.getInputStream();

File file = new File(savePath);

if (!file.exists()) {

file.mkdir();

}

String apkFile = saveFileName;

File ApkFile = new File(apkFile);

FileOutputStream fos = new FileOutputStream(ApkFile);

int count = 0;

byte buf[] = new byte[1024];

do {

int numread = is.read(buf);

count += numread;

progress = (int) (((float) count / length) * 100);

// 更新进度条

mHandler.sendEmptyMessage(DOWN_UPDATE);

if (numread <= 0) {

// 下载完成通知

mHandler.sendEmptyMessage(DOWN_OVER);

break;

}

fos.write(buf, 0, numread);

} while (!interceptFlag);

fos.close();

is.close();

} catch (MalformedURLException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

};

折腾半天，原来是粗心大意，忘记了android的两个权限：

加上后客户端与服务器连接正常，IO流读取正常。