Android 网络编程之HttpURLConnection运用

Android 网络编程之HttpURLConnection

利用HttpURLConnection对象,我们可以从网络中获取网页数据.

01	URL url = new URL("http://www.sohu.com");

02	HttpURLConnection conn = (HttpURLConnection) url.openConnection();

03	conn.setConnectTimeout(6* 1000);//设置连接超时

04	if (conn.getResponseCode() != 200) throw new RuntimeException("请求url失败");

05	InputStream is = conn.getInputStream();//得到网络返回的输入流

06	String result = readData(is, "GBK");

07	conn.disconnect();

08	System.out.println(result);

09	//第一个参数为输入流,第二个参数为字符集编码

10	public static String readData(InputStream inSream, String charsetName) throws Exception{

11	ByteArrayOutputStream outStream = new ByteArrayOutputStream();

12	byte[] buffer = new byte[1024];

13	int len = -1;

14	while( (len = inSream.read(buffer)) != -1 ){

15	outStream.write(buffer, 0, len);

16

}

17	byte[] data = outStream.toByteArray();

18	outStream.close();

19	inSream.close();

20	return new String(data, charsetName);

21

}

利用HttpURLConnection对象,我们可以从网络中获取文件数据.

01	URL url = new URL("http://photocdn.sohu.com/20100125/Img269812337.jpg");

02	HttpURLConnection conn = (HttpURLConnection) url.openConnection();

03	conn.setConnectTimeout(6* 1000);

04	if (conn.getResponseCode() != 200) throw new RuntimeException("请求url失败");

05	InputStream is = conn.getInputStream();

06	readAsFile(is, "Img269812337.jpg");

07

08	public static void readAsFile(InputStream inSream, File file) throws Exception{

09	FileOutputStream outStream = new FileOutputStream(file);

10	byte[] buffer = new byte[1024];

11	int len = -1;

12	while( (len = inSream.read(buffer)) != -1 ){

13	outStream.write(buffer, 0, len);

14

}

15	outStream.close();

16	inSream.close();

17

}

利用HttpURLConnection对象,我们可以向网络发送请求参数.

01	String requestUrl = "http://localhost:8080/itcast/contanctmanage.do";

02	Map<String, String> requestParams = new HashMap<String, String>();

03	requestParams.put("age", "12");

04	requestParams.put("name", "中国");

05	StringBuilder params = new StringBuilder();

06	for(Map.Entry<String, String> entry : requestParams.entrySet()){

07	params.append(entry.getKey());

08	params.append("=");

09	params.append(URLEncoder.encode(entry.getValue(), "UTF-8"));

10	params.append("&");

11

}

12	if (params.length() > 0) params.deleteCharAt(params.length() - 1);

13	byte[] data = params.toString().getBytes();

14	URL realUrl = new URL(requestUrl);

15	HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();

16	conn.setDoOutput(true);//发送POST请求必须设置允许输出

17	conn.setUseCaches(false);//不使用Cache

18	conn.setRequestMethod("POST");

19	conn.setRequestProperty("Connection", "Keep-Alive");//维持长连接

20	conn.setRequestProperty("Charset", "UTF-8");

21	conn.setRequestProperty("Content-Length", String.valueOf(data.length));

22	conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");

23	DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());

24	outStream.write(data);

25	outStream.flush();

26	if( conn.getResponseCode() == 200 ){

27	String result = readAsString(conn.getInputStream(), "UTF-8");

28	outStream.close();

29	System.out.println(result);

30

}

利用HttpURLConnection对象,我们可以向网络发送xml数据.

01	StringBuilder xml =  new StringBuilder();

02	xml.append("<?xml version=\"1.0\" encoding=\"utf-8\" ?>");

03	xml.append("<M1 V=10000>");

04	xml.append("<U I=1 D=\"N73\">中国</U>");

05	xml.append("</M1>");

06	byte[] xmlbyte = xml.toString().getBytes("UTF-8");

07	URL url = new URL("http://localhost:8080/itcast/contanctmanage.do?method=readxml");

08	HttpURLConnection conn = (HttpURLConnection) url.openConnection();

09	conn.setConnectTimeout(6* 1000);

10	conn.setDoOutput(true);//允许输出

11	conn.setUseCaches(false);//不使用Cache

12	conn.setRequestMethod("POST");

13	conn.setRequestProperty("Connection", "Keep-Alive");//维持长连接

14	conn.setRequestProperty("Charset", "UTF-8");

15	conn.setRequestProperty("Content-Length", String.valueOf(xmlbyte.length));

16	conn.setRequestProperty("Content-Type", "text/xml; charset=UTF-8");

17	DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());

18	outStream.write(xmlbyte);//发送xml数据

19	outStream.flush();

20	if (conn.getResponseCode() != 200) throw new RuntimeException("请求url失败");

21	InputStream is = conn.getInputStream();//获取返回数据

22	String result = readAsString(is, "UTF-8");

23	outStream.close();