package com.ruoyi.order.tools.utils;
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import com.fasterxml.jackson.annotation.JsonInclude;
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import com.fasterxml.jackson.databind.DeserializationFeature;
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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 com.fasterxml.jackson.databind.type.TypeFactory;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Map;
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import java.util.TreeMap;
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/**
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* json工具类简单封装
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*
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* @author GaBin on 15/8/29
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*/
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public class JsonUtils {
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/**
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* <pre>
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* 将对象转换成json字符串
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* </pre>
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*
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* @param object 实例对象
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* @return String
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*/
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public static String bean2Json(Object object) {
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ObjectMapper objectMapper = new ObjectMapper();
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objectMapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
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objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
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try {
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return objectMapper.writeValueAsString(object);
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} catch (IOException e) {
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e.printStackTrace();
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}
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return "";
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}
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/**
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* <pre>
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* 将json字符串转化成对象
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* </pre>
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*
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* @param clazz 转化成的对象类型
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* @param json 需要转化的json字符串
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* @param <T> 泛型
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* @return T
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*/
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public static <T> T json2Bean(Class<T> clazz, String json) {
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if (json == null) {
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return null;
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}
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if (json.contains("<html>")) {
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return null;
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}
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ObjectMapper objectMapper = new ObjectMapper();
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objectMapper.configure(DeserializationFeature.ACCEPT_EMPTY_STRING_AS_NULL_OBJECT, true);
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try {
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return objectMapper.readValue(json, clazz);
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} catch (IOException 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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* <pre>
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* 将json字符串转化成List对象
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* </pre>
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*
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* @param clazz Class类型
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* @param json json字符串
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* @param <T> 泛型
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* @return List
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*/
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public static <T> List<T> json2List(Class<T> clazz, String json) {
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if (json == null || json.contains("<html>")) {
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return null;
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}
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ObjectMapper objectMapper = new ObjectMapper();
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try {
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JavaType javaType = getCollectionType(objectMapper, ArrayList.class, clazz);
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return objectMapper.readValue(json, javaType);
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} catch (Exception ignored) {
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}
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return null;
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}
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/**
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* @param clazz Class类型
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* @param json json字符串
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* @param <T> 泛型
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* @return T
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*/
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public static <T> Map<String, T> json2Map(Class<T> clazz, String json) {
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if (json == null || json.contains("<html>")) {
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return null;
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}
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ObjectMapper objectMapper = new ObjectMapper();
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try {
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JavaType javaType = getCollectionType(objectMapper, clazz);
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return objectMapper.readValue(json, javaType);
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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 JavaType getCollectionType(ObjectMapper objectMapper, Class<?> collectionClass, Class<?>... elementClasses) {
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TypeFactory typeFactory = objectMapper.getTypeFactory();
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return typeFactory.constructParametricType(collectionClass, elementClasses);
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}
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public static JavaType getCollectionType(ObjectMapper objectMapper, Class<?> elementClasse) {
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TypeFactory typeFactory = objectMapper.getTypeFactory();
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return typeFactory.constructMapType(TreeMap.class, String.class, elementClasse);
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}
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}
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