JSON 和 POJO 互转，List<T> 和 JSON 互转
2024-09-06 08:41:03
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 +
'}';
}
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