java网络请求工具方法
public final class EasyHttp {private static int TIMEOUT = 10000;// post请求public static String post(String url, Map<String, String> paramMap) {HttpURLConnection conn = null;String resultStr = null;try {URL urlA = new URL(url);conn = (HttpURLConnection) urlA.openConnection();conn.setConnectTimeout(TIMEOUT);// 连接超时 单位毫秒conn.setReadTimeout(TIMEOUT);// 读取超时 单位毫秒// 设置是否向connection输出，因为这个是post请求，参数要放在 http正文内，因此需要设为trueconn.setDoOutput(true);// Read from the connection. Default is true.conn.setDoInput(true);// Set the post method. Default is GETconn.setRequestMethod("POST");// Post 请求不能使用缓存conn.setUseCaches(false);// 配置本次连接的Content-type，配置为application/x-www-form-urlencoded的conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");String paramStr = mapToString(paramMap);byte[] bypes = paramStr.getBytes("UTF-8");conn.connect();OutputStream out = conn.getOutputStream();out.write(bypes);// 输入参数out.flush();out.close();resultStr = returnFromUrl(conn);} catch (Exception e) {e.printStackTrace();} finally {conn.disconnect();}return resultStr;}// get请求public static String get(String url, Map<String, String> paramMap) {HttpURLConnection conn = null;String resultStr = null;try {if (Assert.isNotEmptyMap(paramMap)) {String paramStr = mapToString(paramMap);// 如果不包含?if (!url.contains("?")) {url = url + "?";}// 如果结尾不是&?char lastChar = url.charAt(url.length() - 1);if ('&' != lastChar && '?' != lastChar) {paramStr = "&" + paramStr;}url = url + paramStr;}URL urlA = new URL(url);conn = (HttpURLConnection) urlA.openConnection();conn.setConnectTimeout(TIMEOUT);// 连接超时 单位毫秒conn.setReadTimeout(TIMEOUT);// 读取超时 单位毫秒conn.setDoOutput(true);conn.setDoInput(true);conn.setRequestMethod("GET");conn.setUseCaches(false);//conn.setRequestProperty("User-Agent", "");resultStr = returnFromUrl(conn);} catch (Exception e) {e.printStackTrace();} finally {conn.disconnect();}return resultStr;}// 从url连接中取得返回值public static String returnFromUrl(HttpURLConnection conn) {String result = null;BufferedReader reader = null;try {// 取得输入流，并使用Reader读取reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));StringBuffer buff = new StringBuffer();String oneLine = null;while ((oneLine = reader.readLine()) != null) {buff.append(oneLine);}result = buff.toString();} catch (Exception e) {e.printStackTrace();} finally {try {reader.close();} catch (Exception e) {e.printStackTrace();}}return result;}// 将参数转为字符串public static String mapToString(Map<String, String> map) {if (Assert.isEmptyMap(map)) {return "";}Set<String> set = map.keySet();StringBuffer buf = new StringBuffer();for (String key : set) {String value = map.get(key);if (null != value) {String valueEn = null;try {valueEn = URLEncoder.encode(value, "UTF-8");} catch (Exception e) {e.printStackTrace();}buf.append(key).append("=").append(valueEn).append("&");}}buf.deleteCharAt(buf.length() - 1);return buf.toString();}private EasyHttp() {}?