[FIXED] Convert JSON file to String

Issue

I am pretty new to Java and have an issue that I don't know how to fix. I read a few tutorials, posted questions etc. but I was still not able to understand how to Transfer the knowledge Fixing my Problem.

Here to Problem.

I want to read multiple json files all at one place and convert the data to Strings. I am able to read one data entry in the json, but not more. :-|

The file data Looks as follows:

{
    "Header":{
        "Liste1": {
            "ID": "12345",
            "Name" : "customerlist",
            "Company List": [
                "Company": "c1",
                "Company": "c2",
                "Company": "c3"
            ]
        },
        "Liste2":{
            "ID": "12346",
            "Name" : "vendorlist",
            "Company List": [
                "Company": "c4",
                "Company": "c5",
                "Company": "c6"
            ]
        }
    }
}

The code I used Main:

package testpaket;

import com.google.gson.Gson;
import java.io.FileReader;
import java.io.IOException;
import java.io.Reader;

public class test6 {

    public static void main(String[] args) {

        Gson gson = new Gson();

        try (Reader reader = new FileReader("test.json")) {

            // Convert JSON to Java Object
            Header header = gson.fromJson(reader, Header.class);
            System.out.println(header);

            // Convert JSON to JsonElement, and later to String
            /*JsonElement json = gson.fromJson(reader, JsonElement.class);
            String jsonInString = gson.toJson(json);
            System.out.println(jsonInString);*/



        } catch (IOException e) {
            e.printStackTrace();
        }

    }

}

My Lists class.

package testpaket;

import java.util.List;

public class Lists {

    private String List;
    private int ID;
    private String Name;
    private List<String> companyList;

}

My Header class.

package testpaket;

import java.util.Map;

public class Header {

        String name;
        String list;
        int id;
        String header1;


        private Map<String, Lists> header;


        //getters&setters
        public String getHeader() { 
              return this.header1; 
        }
        public void setHeader(String header) { 
            this.header1 = header1; 
        }
        public String getList() { 
              return this.list; 
        }
        public void setList(String list) { 
            this.list = list; 
        }
        public String getName() { 
              return this.name; 
        }
        public void setName(String name) { 
            this.name = name; 
        }
        public int getID() { 
              return this.id; 
        }
        public void setID(int id) { 
            this.id = id; 
        }
}

Does any of that even make sense? Sorry, but I really tried transfering the knowledge I have so far. Could anyone please help me and tell me how to fix it?

Solution

If you want to convert JSON-files to strings, it is not necessary to convert the file to a Java Object and after to a String. With apache commons-io library you can do this with only 1 line.

String exampleRequest = FileUtils.readFileToString(new File("exampleJsonRequest.json"), StandardCharsets.UTF_8);

Answered By - salvatore rinaudo
Answer Checked By - Dawn Plyler (JavaFixing Volunteer)