fastJson工具类

功能：

json<-->obj
json<-->map
map<-->obj
json---->array（array->json，可使用obj->json）
json---->list（list->json，可使用obj->json）

代码：

FastJsonUtils.java

package com.ebc.json;import java.util.List;
import java.util.Map;import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.serializer.JSONLibDataFormatSerializer;
import com.alibaba.fastjson.serializer.SerializeConfig;
import com.alibaba.fastjson.serializer.SerializerFeature;/*** fastjson工具类* @date 2019-5-27*/
public class FastJsonUtils {private static final SerializeConfig config;static {config = new SerializeConfig();// 使用和json-lib兼容的日期输出格式config.put(java.util.Date.class, new JSONLibDataFormatSerializer());// 使用和json-lib兼容的日期输出格式config.put(java.sql.Date.class, new JSONLibDataFormatSerializer());}private static final SerializerFeature[] features = {// 输出空置字段
            SerializerFeature.WriteMapNullValue,// list字段如果为null，输出为[]，而不是null
            SerializerFeature.WriteNullListAsEmpty,// 数值字段如果为null，输出为0，而不是null
            SerializerFeature.WriteNullNumberAsZero,// Boolean字段如果为null，输出为false，而不是null
            SerializerFeature.WriteNullBooleanAsFalse,// 字符类型字段如果为null，输出为""，而不是null
            SerializerFeature.WriteNullStringAsEmpty};public static String obj2json(Object object) {return JSON.toJSONString(object, config);}public static String obj2json2(Object object) {return JSON.toJSONString(object, config, features);}public static <T> T json2obj(String text, Class<T> clazz) {return JSON.parseObject(text, clazz);}public static <T> Object[] json2array(String text, Class<T> clazz) {return JSON.parseArray(text, clazz).toArray();}public static <T> List<T> json2list(String text, Class<T> clazz) {return JSON.parseArray(text, clazz);}public static <K, V> Map<K, V>  json2map(String s) {Map<K, V> m = (Map<K, V>) JSONObject.parseObject(s);return m;}public static <K, V> String map2json(Map<K, V> m) {String s = JSONObject.toJSONString(m);return s;}public static <K,V,T> T map2obj(Map<K, V> m, Class<T> clazz) {return json2obj(map2json(m),clazz);}public static <K, V> Map<K, V>  obj2map(Object object) {return json2map(obj2json(object));}
}

Water.java

package json;import com.alibaba.fastjson.annotation.JSONField;
import com.alibaba.fastjson.annotation.JSONType;
import lombok.Getter;
import lombok.NoArgsConstructor;
import lombok.Setter;
import lombok.ToString;import java.io.Serializable;
import java.util.Date;/*** @author yaoyuan2* @date 2019/5/25*/
@Setter
@Getter
@NoArgsConstructor
@ToString
@JSONType(typeName = "com.ebc.entity.Water")
public class Water implements Serializable {private String id;private String merchno;private String transcode;private Double amount;@JSONField(name = "trans_time",format = "yyyy-MM-dd HH:mm:ss")private String transTime;@JSONField(name = "create_time")private Date createTime;private String status;
}

JsonTest.java

package json;import cn.hutool.core.collection.CollUtil;
import cn.hutool.core.date.DateUtil;
import cn.hutool.core.lang.Console;
import cn.hutool.core.util.IdUtil;
import com.ebc.json.FastJsonUtils;
import org.junit.Test;import java.util.Date;
import java.util.List;
import java.util.Map;/*** @author yaoyuan2* @date 2019/5/27*/
public class JsonTest {@Testpublic void obj2json() {Water water = new Water();water.setId(IdUtil.objectId());water.setAmount(123.45);water.setMerchno("100000000000001");water.setStatus("00");water.setTranscode("84");water.setCreateTime(DateUtil.date());water.setTransTime(DateUtil.format(new Date(),"yyyy-MM-dd HH:mm:ss"));String json = FastJsonUtils.obj2json(water);Console.log(json);}@Testpublic void obj2json2() {Water water = new Water();water.setId(IdUtil.objectId());water.setAmount(123.45);water.setMerchno("100000000000001");//water.setStatus("00");water.setTranscode("84");water.setCreateTime(DateUtil.date());water.setTransTime(DateUtil.format(new Date(),"yyyy-MM-dd HH:mm:ss"));String json = FastJsonUtils.obj2json2(water);Console.log(json);}@Testpublic void json2obj() {String json = "{\"amount\":123.45,\"create_time\":1558947042583,\"id\":\"5ceba4e24cbdfa60c44677d8\",\"merchno\":\"100000000000001\",\"status\":\"\",\"trans_time\":\"2019-05-27 16:50:42\",\"transcode\":\"84\"}";Water water = FastJsonUtils.json2obj(json,Water.class);Console.log(water);}@Testpublic void json2array() {Water [] waters = new Water[1];Water water = new Water();water.setId(IdUtil.objectId());water.setAmount(123.45);water.setMerchno("100000000000001");//water.setStatus("00");water.setTranscode("84");water.setCreateTime(DateUtil.date());water.setTransTime(DateUtil.format(new Date(),"yyyy-MM-dd HH:mm:ss"));waters[0] = water;String json = FastJsonUtils.obj2json(waters);Console.log(json);//转数组后，返回的必须是Object[]，不能强转。可在for循环里转Object [] ws = FastJsonUtils.json2array(json,Water.class);for (int i = 0; i < ws.length; i++) {Water w = (Water)ws[i];Console.log(w);}}@Testpublic void json2list() {List<Water> waters = CollUtil.newArrayList();Water water = new Water();water.setId(IdUtil.objectId());water.setAmount(123.45);water.setMerchno("100000000000001");//water.setStatus("00");water.setTranscode("84");water.setCreateTime(DateUtil.date());water.setTransTime(DateUtil.format(new Date(),"yyyy-MM-dd HH:mm:ss"));waters.add(water);String json = FastJsonUtils.obj2json(waters);Console.log(json);//可强转List<Water> ws = FastJsonUtils.json2list(json,Water.class);for (int i = 0; i < ws.size(); i++) {Water w = ws.get(i);Console.log(w);}}@Testpublic void json2map() {String json = "{\"amount\":123.45,\"create_time\":1558947042583,\"id\":\"5ceba4e24cbdfa60c44677d8\",\"merchno\":\"100000000000001\",\"status\":\"\",\"trans_time\":\"2019-05-27 16:50:42\",\"transcode\":\"84\"}";Map<String,Object> map = FastJsonUtils.json2map(json);map.forEach((k,v)->{Console.log(k+"="+v);});}@Testpublic void map2json() {String json = "{\"amount\":123.45,\"create_time\":1558947042583,\"id\":\"5ceba4e24cbdfa60c44677d8\",\"merchno\":\"100000000000001\",\"status\":\"\",\"trans_time\":\"2019-05-27 16:50:42\",\"transcode\":\"84\"}";Map<String,Object> map = FastJsonUtils.json2map(json);map.forEach((k,v)->{Console.log(k+"="+v);});String json2 = FastJsonUtils.map2json(map);Console.log(json2);}@Testpublic void map2obj() {String json = "{\"amount\":123.45,\"create_time\":1558947042583,\"id\":\"5ceba4e24cbdfa60c44677d8\",\"merchno\":\"100000000000001\",\"status\":\"\",\"trans_time\":\"2019-05-27 16:50:42\",\"transcode\":\"84\"}";Map<String,Object> map = FastJsonUtils.json2map(json);Water w = FastJsonUtils.map2obj(map,Water.class);Console.log(w);}@Testpublic void obj2map() {Water water = new Water();water.setId(IdUtil.objectId());water.setAmount(123.45);water.setMerchno("100000000000001");//water.setStatus("00");water.setTranscode("84");water.setCreateTime(DateUtil.date());water.setTransTime(DateUtil.format(new Date(),"yyyy-MM-dd HH:mm:ss"));Map<String,Object> map = FastJsonUtils.obj2map(water);map.forEach((k,v)->{Console.log(k+"="+v);});}
}

转载于:https://www.cnblogs.com/yaoyuan2/p/10932230.html

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