Android中从网络获取数据的方法

在编写Android应用时，有时会需要从Internet上获取数据。包括获取网页数据和文件数据。
1.获取网络上的网页数据 通过HttpURLConnection对象,从网络中获取网页数据.

URL url = new URL("http://www.sina.com"); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(5* 1000);//设置连接超时 conn.setRequestMethod("GET");//以get方式发起请求 if (conn.getResponseCode() != 200) throw new RuntimeException("请求url失败"); InputStream is = conn.getInputStream();//得到网络返回的输入流 String result = readData(is, "GBK"); conn.disconnect();

//第一个参数为输入流,第二个参数为字符集编码public static String readData(InputStream inSream, String charsetName) throws Exception{ByteArrayOutputStream outStream = new ByteArrayOutputStream();byte[] buffer = new byte[1024];int len = -1;while( (len = inSream.read(buffer)) != -1 ){outStream.write(buffer, 0, len);}byte[] data = outStream.toByteArray();outStream.close();inSream.close();return new String(data, charsetName);}

2.获取网络上的文件数据
通过HttpURLConnection对象,可以从网络中获取文件数据.

URL url = new URL("http://photocdn.sina.com/xxx");//文件地址HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setConnectTimeout(5* 1000);conn.setRequestMethod("GET");if (conn.getResponseCode() != 200) throw new RuntimeException("请求url失败");InputStream is = conn.getInputStream();readAsFile(is, "Img269812337.jpg");public static void readAsFile(InputStream inSream, File file) throws Exception{FileOutputStream outStream = new FileOutputStream(file);byte[] buffer = new byte[1024];int len = -1;while( (len = inSream.read(buffer)) != -1 ){outStream.write(buffer, 0, len);}  outStream.close();inSream.close();}

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