package org.jeeyxy.util;import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.converter.json.MappingJacksonValue;import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;public class JsonUtils {private static Logger logger = LoggerFactory.getLogger(JsonUtils.class);private final static ObjectMapper objectMapper = new ObjectMapper();private JsonUtils() {}public static ObjectMapper getInstance() {return objectMapper;}/*** javaBean,list,array convert to json string*/public static String toJson(Object obj) {try {return objectMapper.writeValueAsString(obj);} catch (Exception ex) {logger.warn("write to json string error:" + obj, ex);return null;}}/*** json string convert to javaBean*/public static <T> T toBean(String jsonStr, Class<T> clazz) throws Exception {return objectMapper.readValue(jsonStr, clazz);}/*** json string convert to map*/public static <T> Map<String, Object> toMap(String jsonStr) throws Exception {if (jsonStr != null && !"".equals(jsonStr)) {return objectMapper.readValue(jsonStr, Map.class);} else {return null;}}/*** json string convert to map with javaBean*/public static <T> Map<String, T> toMapBean(String jsonStr, Class<T> clazz) throws Exception {Map<String, Map<String, Object>> map = objectMapper.readValue(jsonStr, new TypeReference<Map<String, T>>() {});Map<String, T> result = new HashMap<String, T>();for (Entry<String, Map<String, Object>> entry : map.entrySet()) {result.put(entry.getKey(), mapToBean(entry.getValue(), clazz));}return result;}/*** json array string convert to list with javaBean*/public static <T> List<T> toList(String jsonArrayStr, Class<T> clazz) throws Exception {List<Map<String, Object>> list = objectMapper.readValue(jsonArrayStr, new TypeReference<List<T>>() {});List<T> result = new ArrayList<T>();for (Map<String, Object> map : list) {result.add(mapToBean(map, clazz));}return result;}/*** map convert to javaBean*/public static <T> T mapToBean(Map map, Class<T> clazz) {return objectMapper.convertValue(map, clazz);}public static MappingJacksonValue jsonp(Object value,String callback){MappingJacksonValue mappingJacksonValue = new MappingJacksonValue(value);mappingJacksonValue.setJsonpFunction(callback);return mappingJacksonValue;}
}