package com.xly.util;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.type.CollectionType;
import com.fasterxml.jackson.databind.type.TypeFactory;

import java.io.IOException;
import java.util.List;

public class JsonUtils {

    private static final ObjectMapper objectMapper = new ObjectMapper();

    // JSON字符串转Java对象
    public static <T> T toObject(String json, Class<T> clazz) {
        try {
            return objectMapper.readValue(json, clazz);
        } catch (IOException e) {
            throw new RuntimeException("JSON解析失败", e);
        }
    }

    // JSON字符串转List
    public static <T> List<T> toList(String json, Class<T> clazz) {
        try {
            CollectionType listType = TypeFactory.defaultInstance()
                    .constructCollectionType(List.class, clazz);
            return objectMapper.readValue(json, listType);
        } catch (IOException e) {
            throw new RuntimeException("JSON解析失败", e);
        }
    }

    // 对象转JSON字符串
    public static String toJson(Object obj) {
        try {
            return objectMapper.writeValueAsString(obj);
        } catch (IOException e) {
            throw new RuntimeException("JSON生成失败", e);
        }
    }
}