BlogJava-paulwong-随笔分类-JSON

Pretty print JSON using org.json library in Java

paulwong — Wed, 28 Oct 2020 09:17:00 GMT

Syntax

public java.lang.String toString(int indentFactor) throws JSONException

Example

import org.json.*;
public class JSONPrettyPrintTest {
   public static void main(String args[]) throws JSONException {
      String json = "{" +
                    "Name : Jai," +
                    "Age : 25, " +
                    "Salary: 25000.00 " +
                    "}";
      JSONObject jsonObj = new JSONObject(json);
      System.out.println("Pretty Print of JSON:");
      System.out.println(jsonObj.toString(4)); // pretty print json
   }
}

Output

Pretty Print of JSON:
{
   "Salary": 25000,
   "Age": 25,
   "Name": "Jai"
}

paulwong 2020-10-28 17:17 发表评论

5 ways to customize Spring MVC JSON/XML output

paulwong — Sun, 08 Mar 2020 07:55:00 GMT

https://mostafa-asg.github.io/post/customize-json-xml-spring-mvc-output/

paulwong 2020-03-08 15:55 发表评论

以流的方式解释巨大JSON文件

paulwong — Fri, 03 May 2019 07:22:00 GMT

https://www.ngdata.com/parsing-a-large-json-file-efficiently-and-easily/

https://sites.google.com/site/gson/streaming

http://www.acuriousanimal.com/2015/10/23/reading-json-file-in-stream-mode-with-gson.html

  public static void main(String [] args) throws IOException {
        String filePath = "C:big-data.json";
        FileInputStream in = new FileInputStream(new File(filePath));
        JsonReader reader = new JsonReader(new InputStreamReader(in, "UTF-8"));
        Gson gson = new GsonBuilder().create();
//        reader.beginObject();
//        reader.nextName();
        reader.beginObject();//跳过"{"
        while (reader.hasNext()) {
            // Read data into object model
            JsonToken jsonToken = reader.peek();
            if(jsonToken.equals(JsonToken.NAME)) {
                String name = reader.nextName();
                if(name.equalsIgnoreCase("SUMMARY")) {
//                    reader.beginObject();
                    Summary summary = gson.fromJson(reader, Summary.class);
                    logger.info(summary.toString());
                    break;
//                    reader.endObject();//跳过"}"
                }
            } /*else if(jsonToken.equals(JsonToken.BEGIN_OBJECT)) {
                reader.beginObject();
            } else if(jsonToken.equals(JsonToken.STRING)) {
                logger.info(reader.nextString());
            } else if(jsonToken.equals(JsonToken.NUMBER)) {
                logger.info(reader.nextInt() + "");
            } else if(jsonToken.equals(JsonToken.END_OBJECT)) {
                reader.endObject();
            } */
//            Summary summary = gson.fromJson(reader, Summary.class);
//            break;
        }
        reader.close();
    }

paulwong 2019-05-03 15:22 发表评论