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package com.lazydsr.util.json;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;

import java.util.List;

/**
 * UtilJson
 * PROJECT_NAME: lazy
 * PACKAGE_NAME: com.lazy.com.lazydsr.util.UtilJson
 * Created by Lazy on 2017/5/13 20:16
 * Version: 0.1
 * Info: json常用工具类
 */
public class UtilJson {

    private static final ObjectMapper MAPPER = new ObjectMapper();

    /**
     * 将对象转换成json字符串。
     * Title: pojoToJson
     * Description: 
     *
     * @param data json对象
     * @return json字符串
     */
    public static String objectToJson(Object data) {
        try {
            String string = MAPPER.writeValueAsString(data);
            return string;
        } catch (JsonProcessingException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 将json结果集转化为对象
     *
     * @param jsonData json字符串
     * @param beanType 对象中的object类型
     * @return pojo对象
     */
    public static  T jsonToPojo(String jsonData, Class beanType) {
        try {
            T t = MAPPER.readValue(jsonData, beanType);
            return t;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 将json数据转换成pojo对象list
     * Title: jsonToList
     * Description: 
     *
     * @param jsonData json字符串
     * @param beanType pojo对象类型
     * @return pojo的list集合
     */
    public static  List jsonToList(String jsonData, Class beanType) {
        JavaType javaType = MAPPER.getTypeFactory().constructParametricType(List.class, beanType);
        try {
            List list = MAPPER.readValue(jsonData, javaType);
            return list;
        } catch (Exception e) {
            e.printStackTrace();
        }

        return null;
    }

}