msb discovery java client

[msb/java-sdk.git] / src / main / java / org / onap / msb / sdk / discovery / util / JacksonJsonUtil.java

diff --git a/src/main/java/org/onap/msb/sdk/discovery/util/JacksonJsonUtil.java b/src/main/java/org/onap/msb/sdk/discovery/util/JacksonJsonUtil.java
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+/*******************************************************************************
+ * Copyright 2017 ZTE, Inc. and others.
+ * 
+ * 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.
+ ******************************************************************************/
+/**
+ * Copyright (C) 2015 ZTE, Inc. and others. All rights reserved. (ZTE)
+ *
+ * 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.onap.msb.sdk.discovery.util;
+
+import org.onap.msb.sdk.discovery.common.RouteException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.fasterxml.jackson.core.type.TypeReference;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+public class JacksonJsonUtil {
+
+  private static final Logger logger = LoggerFactory.getLogger(JacksonJsonUtil.class);
+
+  private static ObjectMapper mapper;
+
+  /**
+   * 获取ObjectMapper实例
+   * 
+   * @param createNew 方式：true，新实例；false,存在的mapper实例
+   * @return
+   */
+  public static synchronized ObjectMapper getMapperInstance() {
+    if (mapper == null) {
+      mapper = new ObjectMapper();
+    }
+    return mapper;
+  }
+
+  /**
+   * 将java对象转换成json字符串
+   * 
+   * @param obj 准备转换的对象
+   * @return json字符串
+   * @throws Exception
+   */
+  public static String beanToJson(Object obj) throws RouteException {
+    String json = null;
+    try {
+      ObjectMapper objectMapper = getMapperInstance();
+      json = objectMapper.writeValueAsString(obj);
+    } catch (Exception e) {
+      String errorMsg = "Class beanToJson faild";
+      throwsRouteException(errorMsg, e, "BEAN_TO_JSON_FAILD");
+    }
+    return json;
+  }
+
+
+
+  /**
+   * 将json字符串转换成java对象
+   * 
+   * @param json 准备转换的json字符串
+   * @param cls 准备转换的类
+   * @return
+   * @throws Exception
+   */
+  public static Object jsonToBean(String json, Class<?> cls) throws RouteException {
+    Object vo = null;
+    try {
+      ObjectMapper objectMapper = getMapperInstance();
+
+
+      vo = objectMapper.readValue(json, cls);
+
+    } catch (Exception e) {
+      String errorMsg = cls + " JsonTobean faild:" + e.getMessage();
+      throwsRouteException(errorMsg, e, "JSON_TO_BEAN_FAILD");
+    }
+    return vo;
+  }
+
+
+  /**
+   * 将json字符串转换成java集合对象
+   * 
+   * @param json 准备转换的json字符串
+   * @param cls 准备转换的类
+   * @return
+   * @throws Exception
+   */
+
+  public static <T> T jsonToListBean(String json, TypeReference<T> valueTypeRef) {
+    try {
+
+      ObjectMapper objectMapper = getMapperInstance();
+
+
+      return objectMapper.readValue(json, valueTypeRef);
+
+    } catch (Exception e) {
+      String errorMsg = " JsonTobean faild:" + e.getMessage();
+      logger.error(errorMsg);
+    }
+    return null;
+  }
+
+
+
+  private static void throwsRouteException(String errorMsg, Exception e, String errorCode)
+      throws RouteException {
+    String msg = errorMsg + ".errorMsg:" + e.getMessage();
+    logger.error(msg);
+    throw new RouteException(errorMsg, errorCode);
+  }
+}