Http相关辅助类 HttpUtils

package com.zhy.utils;import java.io.BufferedReader;import java.io.ByteArrayOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.HttpURLConnection;import java.net.URL;/** * Http请求的工具类 *  * @author zhy *  */public class HttpUtils{private static final int TIMEOUT_IN_MILLIONS = 5000;public interface CallBack{void onRequestComplete(String result);}/** * 异步的Get请求 *  * @param urlStr * @param callBack */public static void doGetAsyn(final String urlStr, final CallBack callBack){new Thread(){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) throws Exception{new Thread(){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[128];while ((len = is.read(buf)) != -1){baos.write(buf, 0, len);}baos.flush();return baos.toString();} else{throw new RuntimeException(" responseCode is not 200 ... ");}} catch (Exception e){e.printStackTrace();} finally{try{if (is != null)is.close();} catch (IOException e){}try{if (baos != null)baos.close();} catch (IOException e){}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);// 打开和URL之间的连接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("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;}}

本文参考自http://blog.csdn.net/lmj623565791/article/details/38965311