/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 com.dianping.cosmos.util;
import java.io.IOException;
import java.io.StringWriter;
import java.util.List;
import java.util.Map;
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.JsonNode;
import org.codehaus.jackson.JsonProcessingException;
import org.codehaus.jackson.map.ObjectMapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* JSON工具类
* @author xinchun.wang
*
*/
public class JSONUtil {
private static final Logger LOGGER = LoggerFactory.getLogger(JSONUtil.class);
private static final ObjectMapper MAPPER = new ObjectMapper();
private static final JSONUtil INSTANCE = new JSONUtil();
public static JSONUtil getInstance() {
return INSTANCE;
}
private JSONUtil() {
}
/**
* 将map转化为json
*
* @param map
* @return
*/
public String formatMap2JSON(Map<String, Object> map) {
StringWriter stringWriter = new StringWriter();
String json = "";
try {
JsonGenerator gen = new JsonFactory()
.createJsonGenerator(stringWriter);
MAPPER.writeValue(gen, map);
gen.close();
json = stringWriter.toString();
} catch (Exception e) {
LOGGER.error("", e);
}
return json;
}
/**
* POJO对象转换为JSON
* @param pojo
* @return
*/
public String formatPOJO2JSON(Object pojo) {
StringWriter stringWriter = new StringWriter();
String json = "";
try {
JsonGenerator gen = new JsonFactory()
.createJsonGenerator(stringWriter);
MAPPER.writeValue(gen, pojo);
gen.close();
json = stringWriter.toString();
} catch (Exception e) {
LOGGER.error(pojo.getClass().getName() + "转json出错", e);
}
return json;
}
/**
* 将json转化为map
*
* @param json
* @return
*/
public Map<?, ?> formatJSON2Map(String json) {
Map<?, ?> map = null;
try {
map = MAPPER.readValue(json, Map.class);
} catch (Exception e) {
LOGGER.error("formatJsonToMap error, json = " + json, e);
}
return map;
}
/**
* JSON转换为List
* @param json
* @return
*/
public List<?> formatJSON2List(String json) {
List<?> list = null;
try {
list = MAPPER.readValue(json, List.class);
} catch (Exception e) {
LOGGER.error("formatJSON2List error, json = " + json, e);
}
return list;
}
public boolean equals(String firstJSON, String secondJSON) {
try {
JsonNode tree1 = MAPPER.readTree(firstJSON);
JsonNode tree2 = MAPPER.readTree(secondJSON);
boolean areEqual = tree1.equals(tree2);
return areEqual;
} catch (JsonProcessingException e) {
LOGGER.error("json compare wrong:" + firstJSON + ";" + secondJSON,
e);
} catch (IOException e) {
LOGGER.error("json compare wrong:" + firstJSON + ";" + secondJSON,
e);
}
return false;
}
}