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本篇文章為大家展示了Java 如何實現格式化輸出JSON字符串，內容簡明扼要并且容易理解，絕對能使你眼前一亮，通過這篇文章的詳細介紹希望你能有所收獲。
1 使用阿里的FastJson
1.1 項目的pom.xml依賴
<dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.58</version> </dependency>
1.2 Java示例代碼
(1) 導入的包:
com.alibaba.fastjson.JSON; import com.alibaba.fastjson.JSONObject; import com.alibaba.fastjson.serializer.SerializerFeature;
(2) 測試代碼:
其中JSON字符串為:
{"_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": "機械工業出版社","date": "2007-06-01","tags": [ "Java", "編程語言" ]}}
public static void main(String[] args) {
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\": \"機械工業出版社\",\"date\": \"2007-06-01\",\"tags\": [ \"Java\", \"編程語言\" ]}}";
JSONObject object = JSONObject.parseObject(jsonString);
String pretty = JSON.toJSONString(object, SerializerFeature.PrettyFormat, SerializerFeature.WriteMapNullValue,
SerializerFeature.WriteDateUseDateFormat);
System.out.println(pretty);
}(3) 格式化輸出后的結果:
說明: FastJson通過Tab鍵進行換行后的格式化.
{
"_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":"機械工業出版社",
"category":"編程語言",
"tags":[
"Java",
"編程語言"
]
},
"_id":"1",
"_score":1.0
}2 使用谷歌的Gson
2.1 項目的pom.xml依賴
<dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.2.4</version> </dependency>
2.2 Java示例代碼
(1) 導入的包:
import com.google.gson.Gson; import com.google.gson.GsonBuilder; import com.google.gson.JsonArray; import com.google.gson.JsonElement; import com.google.gson.JsonObject; import com.google.gson.JsonParser;
(2) 測試代碼:
JSON字符串與上述測試代碼相同.
public static void main(String[] args) {
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\": \"機械工業出版社\",\"date\": \"2007-06-01\",\"tags\": [ \"Java\", \"編程語言\" ]}}";
String pretty = toPrettyFormat(jsonString)
System.out.println(pretty);
}
/**
* 格式化輸出JSON字符串
* @return 格式化后的JSON字符串
*/
private static String toPrettyFormat(String json) {
JsonParser jsonParser = new JsonParser();
JsonObject jsonObject = jsonParser.parse(json).getAsJsonObject();
Gson gson = new GsonBuilder().setPrettyPrinting().create();
return gson.toJson(jsonObject);
}(3) 格式化輸出后的結果:
說明: Gson使用2個空格作為換行后的格式轉換.
{
"_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": "機械工業出版社",
"date": "2007-06-01",
"tags": [
"Java",
"編程語言"
]
}
}上述內容就是Java 如何實現格式化輸出JSON字符串，你們學到知識或技能了嗎？如果還想學到更多技能或者豐富自己的知識儲備，歡迎關注億速云行業資訊頻道。
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