Android-HttpUtil工具类

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Http（Java 版 HttpURLConnection）请求的相关工具类

public class HttpUtil {

    private static final int TIMEOUT_IN_MILLIONS = 5000;

    public interface CallBack {

        void onRequestComplete(String requst);

    }

    /**

     * 异步的Get请求

     * @param urlStr

     * @param callBack

     */

    public static void doGetAsyn(final String urlStr, final CallBack callBack) {

        new Thread(new Runnable() {

            @Override

            public void run() {

                try {

                    String result = doGet(urlStr);

                    if (callBack != null) {

                        callBack.onRequestComplete(result);

                    }

                } catch (Exception e) {

                    e.printStackTrace();

                }

            }

        }).start();

    }

    /**

     * 异步的Post请求

     * @param urlStr

     * @param params

     * @param callBack

     * @throws Exception

     */

    public static void doPostAsyn(final String urlStr, final String params,

                                  final CallBack callBack) {

        new Thread(new Runnable() {

            @Override

            public void run() {

                try {

                    String result = doPost(urlStr, params);

                    if (callBack != null) {

                        callBack.onRequestComplete(result);

                    }

                } catch (Exception e) {

                    e.printStackTrace();

                }

            }

        }).start();

    }

    /**

     * Get请求，获得返回数据

     *

     * @param urlStr

     * @return

     * @throws Exception

     */

    public static String doGet(String urlStr) {

        URL url = null;

        HttpURLConnection conn = null;

        InputStream is = null;

        ByteArrayOutputStream baos = null;

        try {

            url = new URL(urlStr);

            conn = (HttpURLConnection) url.openConnection();

            conn.setReadTimeout(TIMEOUT_IN_MILLIONS);

            conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);

            conn.setRequestMethod("GET");

            conn.setRequestProperty("accept", "*/*");

            conn.setRequestProperty("connection", "Keep-Alive");

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

                is = conn.getInputStream();

                baos = new ByteArrayOutputStream();

                int len = -1;

                byte[] buf = new byte[1024];

                while ((len = is.read()) != -1) {

                    baos.write(buf, 0, len);

                }

                baos.flush();

                return baos.toString();

            } else {

                throw new RuntimeException(" responseCode is not 200 ... ");

            }

        } catch (MalformedURLException e) {

            e.printStackTrace();

        } catch (IOException e) {

            e.printStackTrace();

        } finally {

            try {

                if (is != null)

                    is.close();

            } catch (IOException e) {

                e.printStackTrace();

            }

            try {

                if (baos != null)

                    baos.close();

            } catch (IOException e) {

                e.printStackTrace();

            }

            conn.disconnect();

        }

        return null;

    }

    /**

     * 向指定 URL 发送POST方法的请求

     * @param url 发送请求的 URL

     * @param param  请求参数，请求参数应该是 name1=value1&name2=value2 的形式。

     * @return 所代表远程资源的响应结果

     * @throws Exception

     */

    public static String doPost(String url, String param) {

        PrintWriter out = null;

        BufferedReader in = null;

        String result = "";

        try {

            URL realUrl = new URL(url);

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

            // 设置通用的请求属性

            conn.setRequestProperty("accept", "*/*");

            conn.setRequestProperty("connection", "Keep-Alive");

            conn.setRequestMethod("POST");

            conn.setRequestProperty("accept", "*/*");

            conn.setRequestProperty("connection", "Keep-Alive");

            conn.setRequestMethod("POST");

            conn.setRequestProperty("Content-Type",

                    "application/x-www-form-urlencoded");

            conn.setRequestProperty("charset", "utf-8");

            conn.setUseCaches(false);

            // 发送POST请求必须设置如下两行

            conn.setDoOutput(true);

            conn.setDoInput(true);

            conn.setReadTimeout(TIMEOUT_IN_MILLIONS);

            conn.setConnectTimeout(TIMEOUT_IN_MILLIONS);

            if (param != null && !param.trim().equals("")) {

                // 获取URLConnection对象对应的输出流

                out = new PrintWriter(conn.getOutputStream());

                // 发送请求参数

                out.print(param);

                // flush输出流的缓冲

                out.flush();

            }

            // 定义BufferedReader输入流来读取URL的响应

            in = new BufferedReader(new InputStreamReader(conn.getInputStream()));

            String line;

            while ((line = in.readLine()) != null) {

                result += line;

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

        // 使用finally块来关闭输出流、输入流

        finally {

            try {

                if (out != null) {

                    out.close();

                }

                if (in != null) {

                    in.close();

                }

            } catch (IOException ex) {

                ex.printStackTrace();

            }

        }

        return result;

    }

}