119 lines
3.4 KiB
Java
119 lines
3.4 KiB
Java
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package com.ff.base.utils;
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import com.fasterxml.jackson.annotation.JsonInclude;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.databind.DeserializationFeature;
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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 com.fasterxml.jackson.databind.SerializationFeature;
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import java.text.SimpleDateFormat;
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import java.util.Map;
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import java.util.stream.Collectors;
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public class JsonUtil {
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/**
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* 定义映射对象
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*/
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public static ObjectMapper objectMapper = new ObjectMapper();
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/**
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* 日期格式化
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*/
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private static final String DATE_FORMAT = "yyyy-MM-dd HH:mm:ss";
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static {
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//对象的所有字段全部列入
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objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
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//取消默认转换timestamps形式
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objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
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//忽略空Bean转json的错误
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objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
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//所有的日期格式都统一为以下的样式，即yyyy-MM-dd HH:mm:ss
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objectMapper.setDateFormat(new SimpleDateFormat(DATE_FORMAT));
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//忽略 在json字符串中存在，但是在java对象中不存在对应属性的情况。防止错误
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objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
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}
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/**
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* string转JsonNode
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*
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* @param jsonString
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* @return com.fasterxml.jackson.databind.JsonNode
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*/
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public static JsonNode stringToJsonNode(String jsonString) throws JsonProcessingException {
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return objectMapper.readTree(jsonString);
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}
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/**
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* 对象转json字符串
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*
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* @param obj
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* @param <T>
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*/
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public static <T> String objToString(T obj) {
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if (obj == null) {
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return null;
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}
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try {
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return obj instanceof String ? (String) obj : objectMapper.writeValueAsString(obj);
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} catch (JsonProcessingException e) {
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return null;
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}
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}
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/**
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* 对象转格式化的字符串字符串
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*
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* @param obj
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* @param <T>
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* @return
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*/
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public static <T> String objToPrettyString(T obj) {
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if (obj == null) {
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return null;
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}
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try {
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return obj instanceof String ? (String) obj : objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(obj);
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} catch (JsonProcessingException e) {
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return null;
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}
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}
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/**
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* json字符串转对象
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*
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* @param jsonString
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* @param cls
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* @param <T>
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*/
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public static <T> T stringToObj(String jsonString, Class<T> cls) {
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if (StringUtils.isEmpty(jsonString) || cls == null) {
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return null;
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}
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try {
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return cls.equals(String.class) ? (T) jsonString : objectMapper.readValue(jsonString, cls);
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} catch (JsonProcessingException e) {
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return null;
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}
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}
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/**
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* 映射到查询字符串
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*
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* @param map 地图
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* @return {@link String }
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*/// 将LinkedHashMap转换为查询字符串
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public static String mapToQueryString(Map<String, Object> map) {
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return map.entrySet().stream()
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.map(entry -> entry.getKey() + "=" + entry.getValue())
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.collect(Collectors.joining("&"));
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}
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}
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