import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;
import java.util.Map;import org.apache.commons.lang.StringUtils;public class HttpGetUtil {/*** Post 请求超时时间和读取数据的超时时间均为2000ms。** @param urlPath       post请求地址* @param parameterData post请求参数* @return String json字符串，成功：code=1001，否者为其他值* @throws Exception 链接超市异常、参数url错误格式异常*/public static String doPost(String urlPath, String parameterData, String who, String ip) throws Exception {if (null == urlPath || null == parameterData) { // 避免null引起的空指针异常return "";}URL localURL = new URL(urlPath);URLConnection connection = localURL.openConnection();HttpURLConnection httpURLConnection = (HttpURLConnection) connection;httpURLConnection.setDoOutput(true);if (!StringUtils.isEmpty(who)) {httpURLConnection.setRequestProperty("who", who);}if (!StringUtils.isEmpty(ip)) {httpURLConnection.setRequestProperty("clientIP", ip);}httpURLConnection.setRequestMethod("POST");httpURLConnection.setRequestProperty("Accept-Charset", "utf-8");httpURLConnection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");httpURLConnection.setRequestProperty("Content-Length", String.valueOf(parameterData.length()));httpURLConnection.setConnectTimeout(18000);httpURLConnection.setReadTimeout(18000);OutputStream outputStream = null;OutputStreamWriter outputStreamWriter = null;InputStream inputStream = null;InputStreamReader inputStreamReader = null;BufferedReader reader = null;StringBuilder resultBuffer = new StringBuilder();String tempLine = null;try {outputStream = httpURLConnection.getOutputStream();outputStreamWriter = new OutputStreamWriter(outputStream);outputStreamWriter.write(parameterData.toString());outputStreamWriter.flush();if (httpURLConnection.getResponseCode() >= 300) {throw new Exception("HTTP Request is not success, Response code is " + httpURLConnection.getResponseCode());}inputStream = httpURLConnection.getInputStream(); // 真正的发送请求到服务端inputStreamReader = new InputStreamReader(inputStream);reader = new BufferedReader(inputStreamReader);while ((tempLine = reader.readLine()) != null) {resultBuffer.append(tempLine);}} finally {if (outputStreamWriter != null) {outputStreamWriter.close();}if (outputStream != null) {outputStream.close();}if (reader != null) {reader.close();}if (inputStreamReader != null) {inputStreamReader.close();}if (inputStream != null) {inputStream.close();}}return resultBuffer.toString();}public static String doPost(String url, Map<String, Object> params) throws Exception {StringBuffer sb = new StringBuffer();for (Map.Entry<String, Object> entry : params.entrySet()) {sb.append(entry.getKey()).append("=").append(entry.getValue()).append("&");}// no matter for the last '&' characterreturn doPost(url, sb.toString(), "", "");}/*** 向指定URL发送GET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 URL 所代表远程资源的响应结果*/public static String sendGet(String url, String param, String who, String ip) {String result = "";BufferedReader in = null;try {String urlNameString = url;if (!"".equals(param)) {urlNameString = urlNameString + "?" + param;}URL realUrl = new URL(urlNameString);// 打开和URL之间的连接URLConnection connection = realUrl.openConnection();// 设置通用的请求属性if (!StringUtils.isEmpty(who)) {connection.setRequestProperty("who", who);}if (!StringUtils.isEmpty(ip)) {connection.setRequestProperty("clientIP", ip);}connection.setRequestProperty("accept", "*/*");connection.setRequestProperty("connection", "Keep-Alive");connection.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");// 建立实际的连接
            connection.connect();// 定义 BufferedReader输入流来读取URL的响应in = new BufferedReader(new InputStreamReader(connection.getInputStream()));String line;while ((line = in.readLine()) != null) {result += line;}} catch (Exception e) {e.printStackTrace();}// 使用finally块来关闭输入流finally {try {if (in != null) {in.close();}} catch (Exception e2) {e2.printStackTrace();}}return result;}public static String sendGet(String url, Map<String, Object> params) throws Exception {StringBuffer sb = new StringBuffer();for (Map.Entry<String, Object> entry : params.entrySet()) {sb.append(entry.getKey()).append("=").append(entry.getValue()).append("&");}// no matter for the last '&' characterreturn sendGet(url, sb.toString(), "", "");}}