HTTP Post请求响应报文乱码（Accept-Encoding：gzip）

  今天在发送HTTP Post请求时，响应报文有时正常，有时乱码，也不是中文乱码，响应报文整个乱码，最开始以为是InputStreamReader读取的时候字符编码导致，然后使用utf-8：InputStreamReader isr = new InputStreamReader(is, "utf-8");但是还是乱码,然后又想到可能是请求头的字符编码不正确导致，可是请求头也是utf-8,也不是这个问题导致的，经过抓包发现，响应报文体乱码的请求头比不乱码的报文请求头多个属性：Accept-Encoding=gzip，这个问题之前是遇到过的，但是突然忘记了，请求头带Accept-Encoding=gzip的时候，响应报文会被压缩，所以解决办法有两种：第一种（简单粗暴）：请求头中去掉Accept-Encoding的gzip即可
 

第二种（解码）：
 判断响应报文头中是否存在"Content-Encoding"属性，如果有，则判断是否存在"gzip",如果存在，则进行解压，
 否则正常读取即可
 

 /**
 * 发送请求
 * @param requestUrl 请求URL
 * @param requestMethod 请求方法
 * @param outputJsonStr 请求参数
 * @param proxy 是否代理
 * @return
 * @throws Exception
 */
 public static Map httpRequestJson(String requestUrl, String requestMethod, String outputJsonStr, Proxy proxy) throws Exception {Map resMap = new HashMap();StringBuffer buffer = new StringBuffer();HttpsURLConnection conn = null;InputStream is = null;OutputStream os = null;try {URL url = new URL(requestUrl);if (null != proxy) {// 忽略ssl证书不信任SslUtil.ignoreSsl();// 打开连接conn = (HttpsURLConnection) url.openConnection(proxy);} else {conn = (HttpsURLConnection) url.openConnection();}conn.setRequestMethod(requestMethod);// 设置请求头信息HttpHeadUtil.setSpdReqHead(conn);//往服务器端写内容 也就是发起http请求需要带的参数if (null != outputJsonStr) {os = conn.getOutputStream();os.write(outputJsonStr.getBytes());}os.flush();//读取服务器端返回的内容Map> head = conn.getHeaderFields();is = conn.getInputStream();List contentEncoding = (List)head.get("Content-Encoding");// 判断是否存在Content-Encoding属性及属性值是否存在gizpif (null != contentEncoding && (contentEncoding.contains("gzip") || contentEncoding.contains("GZIP"))) {
 //                System.out.println("响应："+ SpdConstant.zipInputStream(is));// gzip解压buffer = SpdConstant.zipInputStream(is);} else {InputStreamReader isr = new InputStreamReader(is, "utf-8");BufferedReader br = new BufferedReader(isr);String line = null;while ((line = br.readLine()) != null) {System.out.println("line:"+line);buffer.append(line);}}System.out.println("body:" + buffer.toString());resMap.put("head", head);resMap.put("body", buffer.toString());} catch (Exception e) {throw e;} finally {if (null != is) {is.close();}if (null != os) {os.close();}}return resMap;}/*** GZIP解压* 解决Content-Encoding: gzip 的问题* @param is 输入字节流* @return* @throws IOException*/public static StringBuffer zipInputStream(InputStream is) throws IOException {GZIPInputStream gzip = new GZIPInputStream(is);BufferedReader in = new BufferedReader(new InputStreamReader(gzip, "UTF-8"));StringBuffer buffer = new StringBuffer();String line;while ((line = in.readLine()) != null)buffer.append(line + "n");return buffer;}