Android网络

public byte[] getNetImage(String path) throws IOException{
　　URL url = new URL(path);
　　HttpURLConnection connection =(HttpURLConnection) url.openConnection();//基于HTTP协议连接对象
　　connection.setConnectTimeout(5000);
　　connection.setRequestMethod("GET");
　　if(connection.getResponseCode() == HttpURLConnection.HTTP_OK){
　　    InputStream in =connection.getInputStream();
　　    return Utils.readStream(in);
　　}
　　return null;
}
 
//将流读取到字节数组
public static byte[] readStream(InputStream in) throws IOException {
　　ByteArrayOutputStream baos = new ByteArrayOutputStream();
　　byte[] buffer = new byte[1024];
　　int len = 0;
　　while ((len = in.read(buffer)) != -1) {
　　    baos.write(buffer, 0, len);
　　}
　　return baos.toByteArray();
}

// 发送POST请求
public static boolean sendPostRequest(String path, Map<String, String> params, String encoding)throws IOException {
　　StringBuilder builder = new StringBuilder();
　　for (Map.Entry<String, String> entry : params.entrySet()) {
　　　　builder.append("?").append(entry.getKey()).append("=").append(entry.getValue()).append("&");
　　}
　　builder.deleteCharAt(builder.length() - 1);
　　URL url = new URL(path);
　　HttpURLConnection connection = (HttpURLConnection) url.openConnection();
　　connection.setConnectTimeout(5000);
　　connection.setRequestMethod("POST");
　　connection.addRequestProperty("Content-Type", "");
　　connection.addRequestProperty("Content-Length", String.valueOf(builder.length()));
　　connection.setDoOutput(true);
　　OutputStream os = connection.getOutputStream();
　　os.write(builder.toString().getBytes());// 只有取得服务器响应消息，才真正发送除数据，现在仅放到内存
　　if (connection.getResponseCode() == HttpURLConnection.HTTP_OK) {
　　    return true;
　　}
　　return false;
}
 
// HttpClient
public static boolean sendHttpClientRequest(String path, Map<String, String> params,String encoding) throws IOException {
　　List<NameValuePair> valuePairs = new ArrayList<NameValuePair>();
　　for (Map.Entry<String, String> entry : params.entrySet()) {
　　    valuePairs.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
　　}
　　UrlEncodedFormEntity entity = new UrlEncodedFormEntity(valuePairs, encoding);// 构造实体数据
　　HttpPost post = new HttpPost(path);// 构造POST请求
　　post.setEntity(entity);
　　DefaultHttpClient client = new DefaultHttpClient();// 构造一个浏览器
　　HttpResponse response = client.execute(post);
　　if (response.getStatusLine().getStatusCode() == 200) {
　　    return true;
　　}
　　return false;
}