1 应用阿里的FastJson
1.1 我的项目的pom.xml依赖
<dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.58</version></dependency>public static void main(String[] args) { String jsonString = "{\"_index\":\"book_shop\",\"_type\":\"it_book\",\"_id\":\"1\",\"_score\":1.0," + "\"_source\":{\"name\": \"Java编程思维（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);} 格式化输入后的后果:阐明: 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编程思维（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}1.2 应用谷歌GSON
public static void main(String[] args) { String jsonString = "{\"_index\":\"book_shop\",\"_type\":\"it_book\",\"_id\":\"1\",\"_score\":1.0," + "\"_source\":{\"name\": \"Java编程思维（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);}/** * 格式化输入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);}阐明: Gson应用2个空格作为换行后的格局转换.
{ "_index": "book_shop", "_type": "it_book", "_id": "1", "_score": 1.0, "_source": { "name": "Java编程思维（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" ] }}