how to parse JSON file using rest API and spring boot

Question

I'm new to this, and I want to read JSON file imported with rest api and parse it with spring boot. I worked with CSV file with his method :

 @RequestMapping(value = "/import", method = RequestMethod.POST)
      public String handleFileUpload(@RequestParam("file") MultipartFile multipartFile) throws IOException {
          String name = multipartFile.getOriginalFilename();
          System.out.println("File name: "+name);
          byte[] bytes = multipartFile.getBytes();
          System.out.println("File uploaded content:\n" + new String(bytes));
          return "file uploaded";
      }

Now i want to parse a JSON File :

[  
    {  
        "name":"John",
        "city":"Berlin",
        "cars":[  
            "audi",
            "bmw"
        ],
        "job":"Teacher"
    },
    {  
        "name":"Mark",
        "city":"Oslo",
        "cars":[  
            "VW",
            "Toyata"
        ],
        "job":"Doctor"
    }
]

I have try it to parse this file with java and it works for me but I dont know how to get it with rest api

This method to parse te file JSON and it works

public static void main(String[] args) throws FileNotFoundException,
    IOException, ParseException {

JSONParser parser = new JSONParser();
JSONArray jsonArray = (JSONArray) parser.parse(new FileReader(
        "D:/PFE 2018/testjsonfile.json"));

for (Object o : jsonArray) {
    JSONObject person = (JSONObject) o;

    String strName = (String) person.get("name");
    System.out.println("Name::::" + strName);

    String strCity = (String) person.get("city");
    System.out.println("City::::" + strCity);

    JSONArray arrays = (JSONArray) person.get("cars");
    for (Object object : arrays) {
        System.out.println("cars::::" + object);
    }
    String strJob = (String) person.get("job");
    System.out.println("Job::::" + strJob);
    System.out.println();

}

}

now how to reuse this methode with rest api

AR1 · Accepted Answer · 2018-05-06 22:27:52Z

1

It depends what you want to do with your JSON (it's not entirely clear in your question). In general, good practice with Spring Boot is to use Jackson either:

binding your JSON with a POJO if you expect your JSON to have a known format or
mapping your JSON in a tree.

Examples for the described behaviours can be found in this article for instance.

answered May 6, 2018 at 22:27

AR1

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4 Comments

user6618310 Over a year ago

thank you, I want to read this JSON file, parse it to an object to inject it in the database

AR1 Over a year ago

Ok, so my answer is what you're looking for as practice. If you have already a Java object then it's normally a POJO and you want the first method.

user6618310 Over a year ago

Can I do it without POJO class ? i already parse it you can show it in the question i update it but nnow i want to insert the file with rest api multipart file and then parse it ?

AR1 Over a year ago

Alright, then instead of using import, etc... You can get the object from the REST call and use Jackson to convert it into a tree (method 2),that won't require a POJO and you'll have a tree object easily parseable.

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