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java實現(xiàn)JSON字符串格式化輸出

更新時間：2024年01月09日 09:33:30 作者：愛碼少年

這篇文章主要為大家詳細介紹了如何使用java實現(xiàn)JSON字符串格式化輸出,文中的示例代碼講解詳細,具有一定的借鑒價值,感興趣的小伙伴可以了解下

一、JSON 字符串格式化輸出

json字符串格式化輸出fastjson、gson、jackson實現(xiàn)

import org.junit.jupiter.api.Test;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.serializer.SerializerFeature;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

import lombok.extern.slf4j.Slf4j;

/**
 * Json字符串格式化
 */
@Slf4j
public class JsonPrettyFormat
{
    private String jsonString =
        "{\"_index\":\"book_shop\",\"_type\":\"it_book\",\"_id\":\"1\",\"_score\":1.0, \"_source\":{\"name\": \"Java編程思想（第4版）\",\"author\": \"[美] Bruce Eckel\",\"category\": \"編程語言\", \"price\": 109.0,\"publisher\": \"機械工業(yè)出版社\",\"date\": \"2007-06-01\",\"tags\": [ \"Java\", \"編程語言\" ]}}";
    
    @Test
    public void fastjsonTest()
    {
        JSONObject object = JSONObject.parseObject(jsonString);
        String pretty = JSON.toJSONString(object, SerializerFeature.PrettyFormat, SerializerFeature.WriteMapNullValue, SerializerFeature.WriteDateUseDateFormat);
        log.info("{} ", pretty);
    }
    
    @Test
    public void gsonTest()
    {
        JsonObject jsonObject = JsonParser.parseString(jsonString).getAsJsonObject();
        Gson gson = new GsonBuilder().setPrettyPrinting().create();
        String pretty = gson.toJson(jsonObject);
        log.info("{} ", pretty);
    }
    
    @Test
    public void jacksonTest()
        throws JsonMappingException, JsonProcessingException
    {
        ObjectMapper mapper = new ObjectMapper();
        Object obj = mapper.readValue(jsonString, Object.class);
        String pretty = mapper.writerWithDefaultPrettyPrinter().writeValueAsString(obj);
        log.info("{} ", pretty);
        
        JsonNode jsonNode = mapper.readTree(jsonString);
        pretty = jsonNode.toPrettyString();
        log.info("{} ", pretty);
    }
}

二、運行結(jié)果

2023-12-19 17:26:19.704 INFO 21640 --- [ main] c.f.t.r.j.JsonPrettyFormat : {
   "_index":"book_shop",
   "_type":"it_book",
   "_source":{
       "date":"2007-06-01",
       "author":"[美] Bruce Eckel",
       "price":109.0,
       "name":"Java編程思想（第4版）",
       "publisher":"機械工業(yè)出版社",
       "category":"編程語言",
       "tags":[
           "Java",
           "編程語言"
       ]
   },
   "_id":"1",
   "_score":1.0
}
2023-12-19 17:26:19.744 INFO 21640 --- [ main] c.f.t.r.j.JsonPrettyFormat : {
"_index": "book_shop",
"_type": "it_book",
"_id": "1",
"_score": 1.0,
"_source": {
"name": "Java編程思想（第4版）",
"author": "[美] Bruce Eckel",
"category": "編程語言",
"price": 109.0,
"publisher": "機械工業(yè)出版社",
"date": "2007-06-01",
"tags": [
"Java",
"編程語言"
]
}
}
2023-12-19 17:26:19.991 INFO 21640 --- [ main] c.f.t.r.j.JsonPrettyFormat : {
"_index" : "book_shop",
"_type" : "it_book",
"_id" : "1",
"_score" : 1.0,
"_source" : {
"name" : "Java編程思想（第4版）",
"author" : "[美] Bruce Eckel",
"category" : "編程語言",
"price" : 109.0,
"publisher" : "機械工業(yè)出版社",
"date" : "2007-06-01",
"tags" : [ "Java", "編程語言" ]
}
}
2023-12-19 17:26:19.999 INFO 21640 --- [ main] c.f.t.r.j.JsonPrettyFormat : {
"_index" : "book_shop",
"_type" : "it_book",
"_id" : "1",
"_score" : 1.0,
"_source" : {
"name" : "Java編程思想（第4版）",
"author" : "[美] Bruce Eckel",
"category" : "編程語言",
"price" : 109.0,
"publisher" : "機械工業(yè)出版社",
"date" : "2007-06-01",
"tags" : [ "Java", "編程語言" ]
}
}