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245 lines
8.1 KiB
Java
245 lines
8.1 KiB
Java
package com.yexuejc.base.util;
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import com.fasterxml.jackson.annotation.JsonInclude.Include;
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import com.fasterxml.jackson.core.JsonParseException;
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import com.fasterxml.jackson.core.JsonParser;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.databind.*;
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import com.fasterxml.jackson.databind.type.MapType;
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import java.io.IOException;
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import java.io.InputStream;
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import java.util.Map;
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import java.util.logging.Logger;
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/**
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* json工具类，基于jackson
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*
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* @author maxf
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* @ClassName JsonUtil
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* @Description
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* @date 2018/9/3 15:28
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*/
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public class JsonUtil {
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private static Logger log = Logger.getLogger(JsonUtil.class.getName());
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private JsonUtil() {
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}
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/**
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* 作为单例全局使用
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*/
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private static ObjectMapper objectMapper = new ObjectMapper();
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static {
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JsonUtil.initDefaultObjectMapper(JsonUtil.objectMapper);
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}
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/**
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* 初始化ObjectMapper为默认属性
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*
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* @param objectMapper
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*/
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private static void initDefaultObjectMapper(ObjectMapper objectMapper) {
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objectMapper.setSerializationInclusion(Include.NON_NULL);
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objectMapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
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objectMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
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objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
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objectMapper.configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
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objectMapper.setDateFormat(DateUtil.DATE_TIME_FORMAT);
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}
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//TODO 待优化
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public static void initSnakeCase() {
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//驼峰下划线互转
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objectMapper.setPropertyNamingStrategy(PropertyNamingStrategy.SNAKE_CASE);
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}
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/**
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* 每调用一次生成一个全新的ObjectMapper供特殊场景使用，与通用ObjectMapper没有关系
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*
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* @return
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*/
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public static ObjectMapper genObjectMapper() {
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ObjectMapper objectMapper = new ObjectMapper();
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JsonUtil.initDefaultObjectMapper(objectMapper);
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return objectMapper;
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}
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/**
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* 将json转换为某个类
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*
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* @param json InputStream类型json数据
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* @param cls 转换类class
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* @return 对象实例
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*/
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public static <T> T json2Obj(InputStream json, Class<T> cls) {
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T pojo = null;
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try {
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pojo = objectMapper.readValue(json, cls);
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} catch (JsonParseException e) {
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log.warning("json to Object JsonParseException.\n" + e.getMessage());
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} catch (JsonMappingException e) {
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log.warning("json to Object JsonMappingException.\n" + e.getMessage());
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} catch (IOException e) {
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log.warning("json to Object IOException.\n" + e.getMessage());
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}
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return pojo;
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}
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/**
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* 将json转换为某个类
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*
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* @param json String类型json数据
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* @param cls 转换类class
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* @return 对象实例
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*/
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public static <T> T json2Obj(String json, Class<T> cls) {
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T pojo = null;
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try {
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pojo = objectMapper.readValue(json, cls);
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} catch (JsonParseException e) {
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log.warning("json to Object JsonParseException.\n" + e.getMessage());
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} catch (JsonMappingException e) {
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log.warning("json to Object JsonMappingException.\n" + e.getMessage());
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} catch (IOException e) {
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log.warning("json to Object IOException.\n" + e.getMessage());
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}catch (Exception e){
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e.printStackTrace();
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}
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return pojo;
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}
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/**
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* Json字符串转换为Java对象
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*
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* @param json 字符串
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* @param parametrized 容器类
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* @param parameterClasses 实际类
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* @return
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*/
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public static <T> T json2Obj(String json, Class<T> parametrized, Class<?>... parameterClasses) {
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T pojo = null;
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JavaType javaType = objectMapper.getTypeFactory().constructParametrizedType(parametrized, parametrized,
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parameterClasses);
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try {
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pojo = objectMapper.readValue(json, javaType);
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} catch (JsonParseException e) {
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log.warning("json to Object JsonParseException.\n" + e.getMessage());
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} catch (JsonMappingException e) {
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log.warning("json to Object JsonMappingException.\n" + e.getMessage());
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} catch (IOException e) {
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log.warning("json to Object IOException.\n" + e.getMessage());
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}
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return pojo;
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}
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/**
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* Json字符串转换为Java-Map对象
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*
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* @param json 字符串
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* @param mapClass Map 继承类
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* @param keyClass Key 类
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* @param valueClass Value 类
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* @param <T>
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* @return
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*/
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public static <T> T json2Obj(String json, Class<? extends Map> mapClass, Class<?> keyClass, Class<?> valueClass) {
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T pojo = null;
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MapType mapType = objectMapper.getTypeFactory().constructMapType(mapClass, keyClass, valueClass);
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try {
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pojo = objectMapper.readValue(json, mapType);
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} catch (JsonParseException e) {
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log.warning("json to Object JsonParseException.\n" + e.getMessage());
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} catch (JsonMappingException e) {
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log.warning("json to Object JsonMappingException.\n" + e.getMessage());
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} catch (IOException e) {
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log.warning("json to Object IOException.\n" + e.getMessage());
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}
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return pojo;
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}
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/**
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* Json字符串转换为Java-Map对象
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*
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* @param json 字符串
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* @param mapClass Map 继承类
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* @param keyType Key 类
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* @param valueType Value 类
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* @param <T>
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* @return
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*/
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public static <T> T json2Obj(String json, Class<? extends Map> mapClass, JavaType keyType, JavaType valueType) {
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T pojo = null;
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MapType mapType = objectMapper.getTypeFactory().constructMapType(mapClass, keyType, valueType);
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try {
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pojo = objectMapper.readValue(json, mapType);
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} catch (JsonParseException e) {
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log.warning("json to Object JsonParseException.\n" + e.getMessage());
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} catch (JsonMappingException e) {
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log.warning("json to Object JsonMappingException.\n" + e.getMessage());
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} catch (IOException e) {
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log.warning("json to Object IOException.\n" + e.getMessage());
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}
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return pojo;
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}
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/**
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* Json字符串转换为Java对象
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*
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* @param json 字符串
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* @param parametrized 容器类
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* @param parameterClasses 实际类
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* @return
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*/
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public static <T> T json2Obj(InputStream json, Class<T> parametrized, Class<?>... parameterClasses) {
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T pojo = null;
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JavaType javaType = objectMapper.getTypeFactory().constructParametrizedType(parametrized, parametrized,
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parameterClasses);
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try {
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pojo = objectMapper.readValue(json, javaType);
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} catch (JsonParseException e) {
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log.warning("json to Object JsonParseException.\n" + e.getMessage());
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} catch (JsonMappingException e) {
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log.warning("json to Object JsonMappingException.\n" + e.getMessage());
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} catch (IOException e) {
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log.warning("json to Object IOException.\n" + e.getMessage());
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}
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return pojo;
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}
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/**
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* 将任何对象转换为json
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*
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* @param pojo 要转换的对象
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* @return 返回json
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*/
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public static String obj2Json(Object pojo) {
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String json = null;
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try {
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json = objectMapper.writeValueAsString(pojo);
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} catch (JsonProcessingException e) {
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log.warning("json to Object JsonProcessingException.\n" + e.getMessage());
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}
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return json;
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}
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/**
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* 格式化输出
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*
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* @param obj 需要输出对象
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* @return 格式化后的字符串
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*/
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public static String formatPrinter(Object obj) {
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String json = null;
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try {
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json = objectMapper.writerWithDefaultPrettyPrinter().writeValueAsString(obj);
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} catch (JsonProcessingException e) {
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log.warning("json to Object JsonProcessingException.\n" + e.getMessage());
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}
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return json;
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}
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} |