Java 格式化输出JSON字符串的2种实现操作
1 使用阿里的FastJson
1.1 项目的pom.xml依赖
<dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.58</version> </dependency>
1.2 Java示例代码
(1) 导入的包:
com.alibaba.fastjson.JSON; import com.alibaba.fastjson.JSONObject; import com.alibaba.fastjson.serializer.SerializerFeature;
(2) 测试代码:
其中JSON字符串为:
{"_index":"book_shop","_type":"it_book","_id":"1","_score":1.0,"_source":{"name": "Java编程思想(第4版)","author": "[美] Bruce Eckel","category": "编程语言","price": 109.0,"publisher": "机械工业出版社","date": "2007-06-01","tags": [ "Java", "编程语言" ]}}
public static void main(String[] args) { String jsonString = "{\"_index\":\"book_shop\",\"_type\":\"it_book\",\"_id\":\"1\",\"_score\":1.0," + "\"_source\":{\"name\": \"Java编程思想(第4版)\",\"author\": \"[美] Bruce Eckel\",\"category\": \"编程语言\"," + "\"price\": 109.0,\"publisher\": \"机械工业出版社\",\"date\": \"2007-06-01\",\"tags\": [ \"Java\", \"编程语言\" ]}}"; JSONObject object = JSONObject.parseObject(jsonString); String pretty = JSON.toJSONString(object, SerializerFeature.PrettyFormat, SerializerFeature.WriteMapNullValue, SerializerFeature.WriteDateUseDateFormat); System.out.println(pretty); }
(3) 格式化输出后的结果:
说明: FastJson通过Tab键进行换行后的格式化.
{ "_index":"book_shop", "_type":"it_book", "_source":{ "date":"2007-06-01", "author":"[美] Bruce Eckel", "price":109.0, "name":"Java编程思想(第4版)", "publisher":"机械工业出版社", "category":"编程语言", "tags":[ "Java", "编程语言" ] }, "_id":"1", "_score":1.0 }
2 使用谷歌的Gson
2.1 项目的pom.xml依赖
<dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.2.4</version> </dependency>
2.2 Java示例代码
(1) 导入的包:
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) 测试代码:
JSON字符串与上述测试代码相同.
public static void main(String[] args) { String jsonString = "{\"_index\":\"book_shop\",\"_type\":\"it_book\",\"_id\":\"1\",\"_score\":1.0," + "\"_source\":{\"name\": \"Java编程思想(第4版)\",\"author\": \"[美] Bruce Eckel\",\"category\": \"编程语言\"," + "\"price\": 109.0,\"publisher\": \"机械工业出版社\",\"date\": \"2007-06-01\",\"tags\": [ \"Java\", \"编程语言\" ]}}"; String pretty = toPrettyFormat(jsonString) System.out.println(pretty); } /** * 格式化输出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) 格式化输出后的结果:
说明: Gson使用2个空格作为换行后的格式转换.
{ "_index": "book_shop", "_type": "it_book", "_id": "1", "_score": 1.0, "_source": { "name": "Java编程思想(第4版)", "author": "[美] Bruce Eckel", "category": "编程语言", "price": 109.0, "publisher": "机械工业出版社", "date": "2007-06-01", "tags": [ "Java", "编程语言" ] } }
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