package com.dsh.other.util;
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import com.alibaba.fastjson.JSON;
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import com.alibaba.fastjson.serializer.SerializerFeature;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.databind.JavaType;
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import com.fasterxml.jackson.databind.JsonNode;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import java.text.SimpleDateFormat;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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/**
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* 返回json数据封装工具类
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*
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* @ClassName: JsonUtil
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* @author: yuds
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* @date: 2019-09-20 09:19:27
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* @version: V1.0.0
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*/
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public class JsonUtil {
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/**
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* <li>将对象转化为json输出
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* <li>QuoteFieldNames ———-输出key时是否使用双引号,默认为true
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* <li>WriteMapNullValue ——–是否输出值为null的字段,默认为false
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* <li>WriteNullNumberAsZero —-数值字段如果为null,输出为0,而非null
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* <li>WriteNullListAsEmpty —–List字段如果为null,输出为[],而非null
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* <li>WriteNullStringAsEmpty —字符类型字段如果为null,输出为”“,而非null
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* <li>WriteNullBooleanAsFalse –Boolean字段如果为null,输出为false,而非null
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* <li>DisableCircularReferenceDetect 禁止循环引用检测
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*/
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private static SerializerFeature[] serializerFeaturess = {SerializerFeature.WriteMapNullValue,
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SerializerFeature.WriteNullNumberAsZero, SerializerFeature.WriteNullListAsEmpty,
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SerializerFeature.WriteNullStringAsEmpty, SerializerFeature.WriteNullBooleanAsFalse,
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SerializerFeature.DisableCircularReferenceDetect,};
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private JsonUtil() {
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}
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/**
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* fastJson Object转json
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*
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* @param obj
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* @return
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*/
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public static String objToJson(Object obj) {
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return JSON.toJSONString(obj, serializerFeaturess);
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}
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/**
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* fastJson Object转json
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*
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* @param obj
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* @param dateFormat 时间格式化
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* @return
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*/
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public static String objToJson(Object obj, String dateFormat) {
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return JSON.toJSONStringWithDateFormat(obj, dateFormat, serializerFeaturess);
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}
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// 定义jackson对象
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private static final ObjectMapper MAPPER = new ObjectMapper();
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/**
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* 将对象转换成json字符串。
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* <p>
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* Title: pojoToJson
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* </p>
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* <p>
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* Description:
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* </p>
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*
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* @param data
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* @return
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*/
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public static String objectToJson(Object data) {
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try {
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SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd HH:mm");
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MAPPER.setDateFormat(fmt);
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String string = MAPPER.writeValueAsString(data);
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return string;
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} catch (JsonProcessingException e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 将json结果集转化为对象
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*
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* @param jsonData json数据
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* @param beanType 对象中的object类型
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* @return
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*/
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public static <T> T jsonToPojo(String jsonData, Class<T> beanType) {
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try {
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T t = MAPPER.readValue(jsonData, beanType);
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return t;
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 将json数据转换成pojo对象list
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* <p>
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* Title: jsonToList
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* </p>
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* <p>
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* Description:
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* </p>
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*
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* @param jsonData
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* @param beanType
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* @return
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*/
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public static <T> List<T> jsonToList(String jsonData, Class<T> beanType) {
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JavaType javaType = MAPPER.getTypeFactory().constructParametricType(List.class, beanType);
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try {
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List<T> list = MAPPER.readValue(jsonData, javaType);
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return list;
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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public static JsonNode jsonToNode(String jsonData) {
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try {
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return MAPPER.readTree(jsonData);
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} catch (Exception ex) {
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ex.printStackTrace();
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}
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return null;
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}
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public static Map<String, String> jsonToMap(String json) {
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JsonNode nodes = jsonToNode(json);
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Iterator<Map.Entry<String, JsonNode>> fields = nodes.fields();
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Map<String, String> map = new HashMap<>();
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while (fields.hasNext()) {
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Map.Entry<String, JsonNode> next = fields.next();
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String value = next.getValue().asText("");
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map.put(next.getKey(), value);
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}
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return map;
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}
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}
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