package com.common.core.utils;
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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.ObjectMapper;
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import lombok.extern.slf4j.Slf4j;
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import java.io.IOException;
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import java.util.Collection;
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import java.util.List;
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/**
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* Json转换工具类
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*/
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@Slf4j
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public class JsonUtils {
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public static final ObjectMapper objectMapper = new ObjectMapper();
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/**
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* 字符串转对象
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*
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* @param jsonStr json字符串
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* @param clazz 转换类型
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* @param <T>
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* @return
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*/
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public static <T> T string2Object(String jsonStr, Class<T> clazz) throws IOException {
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return objectMapper.readValue(jsonStr, clazz);
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}
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/**
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* 字符串转列表
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*
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* @param jsonStr json字符串
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* @param clazz 类型
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* @param <T>
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* @return
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* @throws JsonProcessingException
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*/
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public static <T> Collection<T> string2List(String jsonStr, Class<T> clazz) throws IOException {
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JavaType javaType = objectMapper.getTypeFactory().constructParametricType(Collection.class, clazz);
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return (Collection<T>) objectMapper.readValue(jsonStr, javaType);
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}
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/**
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* 对象转字符串
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*
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* @param object 对象
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* @return
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* @throws JsonProcessingException
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*/
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public static String object2String(Object object) {
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if (object == null) {
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return null;
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}
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try {
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return objectMapper.writeValueAsString(object);
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} catch (JsonProcessingException e) {
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log.warn("对象转字符串", e);
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}
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return null;
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}
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public static String list2String(List object){
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try {
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return objectMapper.writeValueAsString(object);
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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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