JSON 和 POJO

 ???import com.alibaba.fastjson.JSONObject; ???import org.slf4j.Logger; ???import org.slf4j.LoggerFactory; ???/** ????* 对象POJO和JSON互转 ????* ????* @author mxn ????* @create 2018-09-05 14:35 ????*/ ???????public class JsonUtil { ???????public static final Logger logger = LoggerFactory.getLogger(JsonUtil.class); ???????/** ????????* JSON 转 POJO ????????* @param pojo ????????* @param tClass ????????* @param <T> ????????* @return ????????*/ ???????public static <T> T getObject(String pojo, Class<T> tClass) { ???????????try { ???????????????return JSONObject.parseObject(pojo, tClass); ???????????} catch (Exception e) { ???????????????logger.error(tClass + "转 JSON 失败"); ???????????} ???????????return null; ???????} ???????/** ????????* pojo 转json ????????* @param tResponse ????????* @param <T> ????????* @return ????????*/ ???????public static <T> String getJson(T tResponse) { ???????????String pojo = JSONObject.toJSONString(tResponse); ???????????return pojo; ???????} ???}

List 和 JSON

import com.alibaba.fastjson.JSON;import com.alibaba.fastjson.JSONArray;import java.util.List;/** * List集合和JSON互转工具类 * @author mxn * @create 2018-09-05 14:45 */public class JsonListUtil { ???/** ????* List<T> 转 json ????* @param ts ????* @param <T> ????* @return ????*/ ???public static <T> String listToJson(List<T> ts){ ???????return JSON.toJSONString(ts); ???} ???/** ????* json 转 List<T> ????* @param jsonStr ????* @param tClass ????* @param <T> ????* @return ????*/ ???public static <T> List<T> jsonToList(String jsonStr, Class<T> tClass) { ???????return JSONArray.parseArray(jsonStr, tClass); ???}}

测试

POJO和JSON

import org.junit.Test;import org.seckill.entity.Seckill;import org.slf4j.Logger;import org.slf4j.LoggerFactory;/** * @author mxn * @create 2018-09-05 14:40 */public class JsonUtilTest { ???public static final Logger logger = LoggerFactory.getLogger(JsonUtilTest.class); ???????@Test ???public void method1() { ???????Seckill seckill = new Seckill(); ???????seckill.setName("Iphone X"); ???????String json = JsonUtil.getJson(seckill); ???????logger.info("JsonUtilTest.method1 info={}",json); ???????Seckill object = JsonUtil.getObject(json, Seckill.class); ???????logger.info("JsonUtilTest.method1 info={}",object.getName()); ???}}

List 和 JSON

import org.junit.Before;import org.junit.Test;import org.seckill.entity.Seckill;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import java.util.ArrayList;import java.util.List;/** * @author mxn * @create 2018-09-05 14:48 */public class JsonListUtilTest { ???????public static final Logger logger = LoggerFactory.getLogger(JsonListUtilTest.class); ???????private List<Seckill> list = new ArrayList<Seckill>(); ???private String jsonStr; ???@Before ???public void beforeMethod() { ???????for (int i = 0; i < 5; i++) { ???????????Seckill seckill = new Seckill(); ???????????seckill.setName("iphone " + i); ???????????list.add(seckill); ???????} ???????jsonStr = "[{\"name\":\"iphone 0\",\"number\":0,\"seckillId\":0},{\"name\":\"iphone 1\",\"number\":0,\"seckillId\":0},{\"name\":\"iphone 2\",\"number\":0,\"seckillId\":0},{\"name\":\"iphone 3\",\"number\":0,\"seckillId\":0},{\"name\":\"iphone 4\",\"number\":0,\"seckillId\":0}]"; ???} ???@Test ???public void method() { ???????String s = JsonListUtil.listToJson(list); ???????logger.info("JsonListUtilTest.method info={}",s); ???} ???@Test ???public void method2() { ???????List<Seckill> seckills = JsonListUtil.jsonToList(jsonStr, Seckill.class); ???????for (Seckill seckill : seckills) { ???????????logger.info("JsonListUtilTest.method2 info={}",seckill.getName()); ???????} ???}}

POJO

import java.util.Date;/** * @author mxn * @create 2018-05-17 15:36 */public class Seckill { ???private long seckillId; ???private String name; ???private int number; ???private Date startTime; ???private Date endTime; ???private Date createTime; ???public long getSeckillId() { ???????return seckillId; ???} ???public void setSeckillId(long seckillId) { ???????this.seckillId = seckillId; ???} ???public String getName() { ???????return name; ???} ???public void setName(String name) { ???????this.name = name; ???} ???public int getNumber() { ???????return number; ???} ???public void setNumber(int number) { ???????this.number = number; ???} ???public Date getStartTime() { ???????return startTime; ???} ???public void setStartTime(Date startTime) { ???????this.startTime = startTime; ???} ???public Date getEndTime() { ???????return endTime; ???} ???public void setEndTime(Date endTime) { ???????this.endTime = endTime; ???} ???public Date getCreateTime() { ???????return createTime; ???} ???public void setCreateTime(Date createTime) { ???????this.createTime = createTime; ???} ???@Override ???public String toString() { ???????return "Seckill{" + ???????????????"seckillId=" + seckillId + ???????????????", name=‘" + name + ‘\‘‘ + ???????????????", number=" + number + ???????????????", startTime=" + startTime + ???????????????", endTime=" + endTime + ???????????????", createTime=" + createTime + ???????????????‘}‘; ???}}

JSON 和 POJO 互转，List<T> 和 JSON 互转

原文地址：https://www.cnblogs.com/menxn/p/9592211.html