fastjson处理json字符串成java对象之前的相互转换

1 这段代码主要是利用fastjson的封装方法处理json字符串成java对象之前的相互转换

package com.neo.util;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.TypeReference;
import com.alibaba.fastjson.serializer.JSONLibDataFormatSerializer;
import com.alibaba.fastjson.serializer.SerializeConfig;
import com.alibaba.fastjson.serializer.SerializerFeature;

import java.util.List;
import java.util.Map;

/**
 * Created by hqj on 2021/2/5.
 */
public class Json {
    private static SerializeConfig config;
    private static SerializerFeature[] features = {
            //输出空值字段
            SerializerFeature.WriteMapNullValue,
            //如果数组结果为null,则输出为[],而不是null
            SerializerFeature.WriteNullListAsEmpty,
            //数值字段为null,则输出为0,而不是null
            SerializerFeature.WriteNullNumberAsZero,
            //Boolean字段为null,则输出为false,而不是null
            SerializerFeature.WriteNullBooleanAsFalse,
            //字符类型如果为null,则输出为" ",而不是null
            SerializerFeature.WriteNullStringAsEmpty
    };
    static {
        config = new SerializeConfig();
        //使用json-lib兼容的日期输出格式
        config.put(java.util.Date.class,new JSONLibDataFormatSerializer());
    }

    /**
     * 将一个对象装换为Json字符串
     */
    public static String ToJSONString(Object object) {
        return JSONObject.toJSONString(object,config,features);
    }

    /**
     * 将Json字符串转换为Object类型的
     * */
    public  static  Object ToObject(String str){
        return JSON.parse(str);
    }

    /**
     * 将Json字符串转换为实例
     * */
    public static <T> T ToObject(String str,Class<T> t){
        return JSON.parseObject(str,t);
    }

    /**
     * 将Json转换为指定类型的List
     * */
    public static <T> List<T> ToList(String str, Class<T> t){
        return JSON.parseArray(str,t);
    }

    /**
     * 将Json转换为Map
     * */
    public static <T> Map<String,T> ToMap(String str){
        return (Map<String, T>) JSONObject.parseObject(str);
    }
}

下面是测试代码

package com.neo.util; 

import com.neo.entity.Media;
import com.neo.entity.News;
import com.neo.entity.SysLog;
import org.junit.Test;
import org.junit.Before; 
import org.junit.After;

import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;

/** 
* Json Tester. 
* 
* @author <Authors name> 
* @since <pre>02/05/2021</pre> 
* @version 1.0 
*/ 
public class JsonTest { 

@Before
public void before() throws Exception { 
} 

@After
public void after() throws Exception { 
} 

/** 
* 
* Method: ToJSONString(Object object) 
* 
*/ 
@Test
public void testToJSONString() throws Exception { 
//TODO: Test goes here...
    SysLog log = new SysLog();
    log.setUserName("jack");
    log.setAction("add");
    log.setEvent("insert");
    log.setHost("127.0.0.1");
    log.setInsertTime(LocalDateTime.now());

    String strJson = Json.ToJSONString(log);
    System.out.println(strJson);
} 

/** 
* 
* Method: ToObject(String str) 
* 
*/ 
@Test
public void testToObjectStr() throws Exception { 
    String strJson ="{\"action\":\"add\",\"event\":\"insert\",\"host\":\"127.0.0.1\",\"insertTime\":\"2021-02-05T14:58:13.891\",\"logId\":0,\"userName\":\"jack\"}";
    Object obj = Json.ToObject(strJson);
    System.out.println(obj);
} 

/** 
* 
* Method: ToObject(String str, Class<T> t) 
* 
*/ 
@Test
public void testToObjectForStrT() throws Exception {
    String strJson ="{\"action\":\"add\",\"event\":\"insert\",\"host\":\"127.0.0.1\",\"insertTime\":\"2021-02-05T14:58:13.891\",\"logId\":0,\"userName\":\"jack\"}";
    SysLog obj = Json.ToObject(strJson,SysLog.class);
    System.out.println(obj);
} 

/** 
* 
* Method: ToList(String str, Class<T> t) 
* 
*/ 
@Test
public void testToList() throws Exception {
    /*ArrayList<SysLog> List = new ArrayList<>();
    for (int i=0;i<3;i++)
    {
        SysLog log = new SysLog();
        log.setUserName("jack"+i);
        log.setAction("add");
        log.setEvent("insert");
        log.setHost("127.0.0.1");
        log.setInsertTime(LocalDateTime.now());
        List.add(log);
    }
    String strJson = Json.ToJSONString(List);

    List<SysLog> List2 = Json.ToList(strJson,SysLog.class);

    System.out.println(List2);*/

    ArrayList<Media> listMedia = new ArrayList<>();
    for(int i=0;i<3;i++){
        Media media = new Media();
        media.setId(i);
        media.setTypeId(i);
        media.setMemo("test"+i);
        media.setPicUrl("/pic/test"+i+".jpg");
        listMedia.add(media);
    }
    News news = new News();
    news.setAuthor("jack");
    news.setContents("this is a test for news");
    news.setTitle("news title");
    news.setListMedia(listMedia);

    String strJson = Json.ToJSONString(news);

    News news2 = Json.ToObject(strJson,News.class);
    System.out.println(news2);
}


    /**
* 
* Method: ToMap(String str) 
* 
*/ 
@Test
public void testToMap() throws Exception { 
//TODO: Test goes here... 
} 


} 

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