URL url=new URL("http://www.baidu.com");
connection =(HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
InputStream in =connection.getInputStream();
HttpClient client = new DefaultHttpClient();
HttpGet get = new HttpGet("http://www.baidu.com");
HttpResponse response =client.execute(get);
HttpEntity entity =response.getEntity();
InputStream in = entity.getContent();
看看是不是dns解析的问题,是随机出现的么,返回什么错误
http://blog.csdn.net/hguang_zjh/article/details/33743249
4.4版本的模拟器上这2种都可以,没有错误返回