117 lines
3.1 KiB
Java
117 lines
3.1 KiB
Java
package com.rzyc.provinceUtil;
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import com.fasterxml.jackson.core.type.TypeReference;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import java.lang.reflect.ParameterizedType;
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import java.lang.reflect.Type;
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/**
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* @author dong
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* @date 2025-03-18 15:25
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* @Version V1.0
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*/
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public class JsonUtils {
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private static final ObjectMapper objectMapper = new ObjectMapper();
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/**
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* 将 JSON 字符串转换为包含泛型的对象
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* @param json JSON 字符串
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* @param mainClass 主类型（如 Result.class）
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* @param subClass 泛型参数类型（如 User.class）
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* @return 转换后的对象
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*/
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public static <T, R> T fromJson(String json, Class<T> mainClass, Class<R> subClass) {
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try {
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// 动态构建泛型类型（例如 Result<User>）
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Type type = createParametricType(mainClass, subClass);
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return objectMapper.readValue(json, new TypeReference<T>() {
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@Override
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public Type getType() {
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return type;
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}
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});
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} catch (Exception e) {
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throw new RuntimeException("JSON 转换失败", e);
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}
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}
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/**
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* 构建 ParameterizedType（例如 Result<User>）
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*/
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private static ParameterizedType createParametricType(final Class<?> rawType,
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final Type... typeArguments){
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return new ParameterizedType() {
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@Override
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public Type[] getActualTypeArguments() {
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return typeArguments;
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}
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@Override
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public Type getRawType() {
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return rawType;
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}
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@Override
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public Type getOwnerType() {
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return null;
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}
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};
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}
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/**
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* 使用示例：解析 Result<List<User>>
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* @version v1.0
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* @author dong
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* @date 2025/3/18 15:44
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*/
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/* Type userListType = new TypeToken<List<User>>() {}.getType();
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Result<List<User>> result = JsonUtils.fromJsonComplex(
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json,
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Result.class,
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userListType
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);*/
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/**
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* json转list
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* @version v1.0
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* @author dong
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* @date 2025/3/18 15:43
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*/
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public static <T> T fromJsonComplex(String json, Class<?> rawType, Type... genericTypes) {
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try {
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ParameterizedType type = new ParameterizedType() {
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@Override
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public Type[] getActualTypeArguments() {
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return genericTypes;
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}
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@Override
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public Type getRawType() {
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return rawType;
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}
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@Override
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public Type getOwnerType() {
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return null;
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}
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};
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return objectMapper.readValue(json, new TypeReference<T>() {
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@Override
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public Type getType() {
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return type;
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}
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});
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} catch (Exception e) {
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throw new RuntimeException("JSON 转换失败", e);
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}
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}
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}
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