Java tutorial
/* * Copyright 2016 Huawei Technologies Co., Ltd. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.openo.nfvo.vnfmadapter.common; import java.io.IOException; import java.io.InputStream; import javax.servlet.http.HttpServletRequest; import org.apache.commons.io.IOUtils; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import net.sf.json.JSONArray; import net.sf.json.JSONException; import net.sf.json.JSONObject; import net.sf.json.util.JSONTokener; /** * VNFM JSON utils.</br> * * @author * @version NFVO 0.5 Sep 10, 2016 */ public final class VnfmJsonUtil { private static final Logger LOGGER = LoggerFactory.getLogger(VnfmJsonUtil.class); private VnfmJsonUtil() { //private constructor } /** * Get the JSON string from input http context. * <br/> * * @param vnfReq HttpServletRequest * @return * @since NFVO 0.5 */ @SuppressWarnings("unchecked") public static <T> T getJsonFromContexts(HttpServletRequest vnfReq) { try { InputStream vnfInput = vnfReq.getInputStream(); String vnfJsonStr = IOUtils.toString(vnfInput); JSONTokener vnfJsonTokener = new JSONTokener(vnfJsonStr); if (vnfJsonTokener.nextClean() == Character.codePointAt("{", 0)) { return (T) JSONObject.fromObject(vnfJsonStr); } vnfJsonTokener.back(); if (vnfJsonTokener.nextClean() == Character.codePointAt("[", 0)) { return (T) JSONArray.fromObject(vnfJsonStr); } } catch (IOException e) { LOGGER.error("function=getJsonFromContext, msg=IOException occurs, e={}.", e); } catch (JSONException e) { LOGGER.error("function=getJsonFromContext, msg=JSONException occurs, e={}.", e); } return null; } }