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package com.banzhuan.accountservice.util; import com.fasterxml.jackson.annotation.JsonInclude; import com.fasterxml.jackson.core.JsonParseException; import com.fasterxml.jackson.core.JsonProcessingException; import com.fasterxml.jackson.core.type.TypeReference; import com.fasterxml.jackson.databind.DeserializationFeature; import com.fasterxml.jackson.databind.JavaType; import com.fasterxml.jackson.databind.JsonMappingException; import com.fasterxml.jackson.databind.ObjectMapper; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.io.IOException; import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; /** * @description json工具类,依赖jackson * @author linyoulong * @version V1.0 */ public class JacksonUtil { private static Logger logger = LoggerFactory.getLogger(JacksonUtil.class); private static ObjectMapper INSTANCE = new ObjectMapper(); private JacksonUtil() {} /** * @param obj 准备转换对象 * @return * @description 对象转换成json字符串 * @version V1.0 */ public static String toJsonStr(Object obj) { try { return INSTANCE.writeValueAsString(obj); } catch (JsonProcessingException e) { logger.error("toJsonStr error:",e); } return null; } /** * javaBean、列表数组转换为json字符串,忽略空值 */ public static String toJsonStrIgnoreNull(Object obj) throws Exception { ObjectMapper mapper = new ObjectMapper(); mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL); return mapper.writeValueAsString(obj); } /** * @param json 准备转换json * @param type 转换类型 * @return * @throws Exception 转换异常 * @description json字符串转换成对象 */ @SuppressWarnings("unchecked") public static <T> T json2pojo(String json, String type) { try { return (T) json2pojo(json, Class.forName(type)); } catch (ClassNotFoundException e) { logger.error("json2pojo error:",e); } catch (Exception e) { logger.error("json2pojo error:",e); } return null; } /** * @param json 准备转换json * @param clazz 转换类型 * @return * @description json字符串转换成对象 */ public static <T> T json2pojo(String json, Class<T> clazz) { try { return (T) INSTANCE.readValue(json, clazz); } catch (JsonParseException e) { logger.error("json2pojo error:",e); } catch (JsonMappingException e) { logger.error("json2pojo error:",e); } catch (IOException e) { logger.error("json2pojo error:",e); } return null; } /** * @param json 准备转换json * @param clazz 转换类型 * @return * @description json字符串转换成对象，当遇到没有的字段，则忽略 */ public static <T> T json2pojoCompatible(String json, Class<T> clazz) { try { ObjectMapper mapper = new ObjectMapper(); mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,false); return (T) mapper.readValue(json, clazz); } catch (JsonParseException e) { logger.error("json2pojoCompatible error:",e); } catch (JsonMappingException e) { logger.error("json2pojoCompatible error:",e); } catch (IOException e) { logger.error("json2pojoCompatible error:",e); } return null; } /** * @param json 准备转换json * @param type 转换类型 * @return * @description json字符串转换成对象，当遇到没有的字段，则忽略 */ public static <T> T json2pojoCompatible(String json, TypeReference<T> type) { try { ObjectMapper mapper = new ObjectMapper(); mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES,false); return (T) mapper.readValue(json, type); } catch (JsonParseException e) { logger.error("json2pojoCompatible error:",e); } catch (JsonMappingException e) { logger.error("json2pojoCompatible error:",e); } catch (IOException e) { logger.error("json2pojoCompatible error:",e); } return null; } /** * json字符串转换为map */ public static <T> Map<String, Object> json2map(String jsonString) throws Exception { ObjectMapper mapper = new ObjectMapper(); mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL); return mapper.readValue(jsonString, Map.class); } /** * json字符串转换为map */ public static <T> Map<String, T> json2map(String jsonString, Class<T> clazz) throws Exception { Map<String, Map<String, Object>> map = INSTANCE.readValue(jsonString, new TypeReference<Map<String, T>>() { }); Map<String, T> result = new HashMap<>(); for (Map.Entry<String, Map<String, Object>> entry : map.entrySet()) { result.put(entry.getKey(), map2pojo(entry.getValue(), clazz)); } return result; } /** * 深度转换json成map * * @param json * @return */ public static Map<String, Object> json2mapDeeply(String json) throws Exception { return json2MapRecursion(json, INSTANCE); } /** * 把json解析成list，如果list内部的元素存在jsonString，继续解析 * * @param json * @param mapper 解析工具 * @return * @throws Exception */ private static List<Object> json2ListRecursion(String json, ObjectMapper mapper) throws Exception { if (json == null) { return null; } List<Object> list = mapper.readValue(json, List.class); for (Object obj : list) { if (obj != null && obj instanceof String) { String str = (String) obj; if (str.startsWith("[")) { obj = json2ListRecursion(str, mapper); } else if (obj.toString().startsWith("{")) { obj = json2MapRecursion(str, mapper); } } } return list; } /** * 把json解析成map，如果map内部的value存在jsonString，继续解析 * * @param json * @param mapper * @return * @throws Exception */ private static Map<String, Object> json2MapRecursion(String json, ObjectMapper mapper) throws Exception { if (json == null) { return null; } Map<String, Object> map = mapper.readValue(json, Map.class); for (Map.Entry<String, Object> entry : map.entrySet()) { Object obj = entry.getValue(); if (obj != null && obj instanceof String) { String str = ((String) obj); if (str.startsWith("[")) { List<?> list = json2ListRecursion(str, mapper); map.put(entry.getKey(), list); } else if (str.startsWith("{")) { Map<String, Object> mapRecursion = json2MapRecursion(str, mapper); map.put(entry.getKey(), mapRecursion); } } } return map; } /** * @param json 准备转换json * @param clazz 集合元素类型 * @return * @description json字符串转换成对象集合 */ @SuppressWarnings("unchecked") public static <T> List<T> parseJsonList(String json, Class<T> clazz) { try { JavaType javaType = getCollectionType(ArrayList.class, clazz); return (List<T>) INSTANCE.readValue(json, javaType); } catch (IOException e) { logger.error("parseJsonList error:",e); } return null; } /*