java 工具中json的使用

package com.royan.weakey.platform.common.jdk18;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.royan.weakey.platform.dataobject.ContactDO;
import lombok.extern.slf4j.Slf4j;

import java.util.ArrayList;
import java.util.List;

/**
 * json 工具的使用
 * 1）json字符串转为具体的对象
 * 2) 对象转为json串
 * 3) 集合转为json数组
 * 4) json数组转为集合
 */
@Slf4j
public class JsonUtil {
    private String name = "{\"name\":\"bai\",\"wo\":\"中国人\"}\n";


    public static <T> T jsonStrToObject(String str, Class<T> clz) {
        log.info("str--{}", str);
        T t = JSON.parseObject(str, clz);
        return t;
    }


    public static <T> List<T> jsonStrToList(String str, Class<T> clz) {
        log.info("str--{}", str);
        List<T> list = JSON.parseArray(str, clz);
        return list;
    }


    public static <T> String objToJsonStr(T t) {
        log.info("t--{}", JSON.toJSONString(t, SerializerFeature.DisableCircularReferenceDetect));
        return JSON.toJSONString(t, SerializerFeature.DisableCircularReferenceDetect);
    }


    public static <T> String listTOJsonStr(List<T> t) {
        log.info("t--{}", JSON.toJSONString(t, SerializerFeature.DisableCircularReferenceDetect));
        return JSON.toJSONString(t, SerializerFeature.DisableCircularReferenceDetect);
    }


    public static void main(String[] args) {
        ContactDO contactDO = new ContactDO();
        contactDO.setOwnerId("ownerId");
        contactDO.setContactPhone("contactPhone");
        contactDO.setContactId("contactId");
        contactDO.setContactName("contactName");
        objToJsonStr(contactDO);
        log.info("\n");
        List<ContactDO> list = new ArrayList<>();
        list.add(contactDO);
        list.add(contactDO);
        list.add(contactDO);
        listTOJsonStr(list);
        log.info("\n");
        String str = "{\"contactId\":\"contactId\",\"contactName\":\"contactName\",\"contactPhone\":\"contactPhone\",\"ownerId\":\"ownerId\"}";
        ContactDO contactDO1 = jsonStrToObject(str, ContactDO.class);
        log.info("contactDO1,contactName:{},setOwnerId:{}", contactDO1.getContactName(), contactDO1.getOwnerId());
        log.info("\n");
        String arrayStr = "[{\"contactId\":\"contactId\",\"contactName\":\"contactName\"," +
                "\"contactPhone\":\"contactPhone\",\"ownerId\":\"ownerId\"},{\"contactId\":\"contactId\",\"contactName\":\"contactName\",\"contactPhone\":\"contactPhone\",\"ownerId\":\"ownerId\"},{\"contactId\":\"contactId\",\"contactName\":\"contactName\",\"contactPhone\":\"contactPhone\",\"ownerId\":\"ownerId\"}]\n";
        List<ContactDO> contactDOS = jsonStrToList(arrayStr, ContactDO.class);
        log.info("list.get())-{}", contactDOS.get(0).toString());




    }


}

 

package com.royan.weakey.platform.dataobject;

import com.royan.weakey.platform.common.dto.AbstractBaseDO;
import lombok.Data;

/**
 * 联系人关系实体类
 */
@Data
public class ContactDO extends AbstractBaseDO {

    /**
     * 联系人姓名
     */
    private String contactName;

    /**
     * 联系人电话
     */
    private String contactPhone;
    /**
     * owner电话
     */
    private String contactId;
    /**
     * owner
     */
    private String ownerId;


    @Override
    public String toString() {
        return "ContactDO{" +
                "contactName='" + contactName + '\'' +
                ", contactPhone='" + contactPhone + '\'' +
                ", contactId='" + contactId + '\'' +
                ", ownerId='" + ownerId + '\'' +
                '}';
    }
}