public static String parseResponse(CloseableHttpResponse response) {
		//响应内容
		String content = null;
		
		if(response == null) {
			return content;
		}
		
		//只有响应OK时才进行解析
		int responseCode = response.getStatusLine().getStatusCode();
		if(responseCode == HttpStatus.SC_OK) {
			try {
				content = EntityUtils.toString(response.getEntity());
			} catch (ParseException e) {
				logger.error(RequestConstants.MSG_RESPONSE_PARSE_ERROR + e.toString());
			} catch (IOException e) {
				logger.error(RequestConstants.MSG_RESPONSE_IO_ERROR + e.toString());
			}
		}
		else{
			//响应不正常时写入日志
			logger.error(responseCode);
		}
		
		try {
			//关闭相应，释放连接
			response.close();
		} catch (IOException e) {
			logger.error(RequestConstants.MSG_RESPONSE_CLOSE_FAILD + e.toString());
		}
		return content;
	}