How to send json data in url as request parameters in java

Question

I want to send json data in url as below .

editTest.jsp?details=374889331-{"aNumber":2}

How can I do this?

Answer 1

URL encode your details parameter:

String otherParameter = "374889331-";    
String jsonString = "{\"aNumber\":2}";

String url = "editTest.jsp?details=" + URLEncoder.encode(otherParameter + jsonString, "UTF-8");

Answer 2

you need to convert the JSON object to string

      JSONObject obj = new JSONObject();

      obj.put("name","foo");

      StringWriter out = new StringWriter();
      obj.writeJSONString(out);

      String jsonText = out.toString();//JSON object is converted to string

Now, you can pass this jsonText as parameter.

Answer 3

We can convert the Object to JSON Object using GSON, then parse the JSON object and convert it to query param string. The Object should only contain primitive objects like int, float, string, enum, etc. Otherwise, you need to add extra logic to handle those cases.

public String getQueryParamsFromObject(String baseUrl, Object obj) {
        JsonElement json = new Gson().toJsonTree(obj);
        // Assumption is that all the parameters will be json primitives and there will
        // be no complex objects.
        return baseUrl + json.getAsJsonObject().entrySet().stream()
                .map(entry -> entry.getKey() + "=" + entry.getValue().getAsString())
                .reduce((e1, e2) -> e1 + "&" + e2)
                .map(res -> "?" + res).orElse("");
    }

Answer 4

Json2 can help. JSON.stringify(obj)

Answer 5

We can use the help of Gson

String result =new Gson().toJson("your data");

NB: jar file needed for Gson

Answer 6

I would like to add my solution:

import java.net.URI;
import java.net.URISyntaxException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import com.google.gson.Gson;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;
import com.google.gson.JsonElement;


private static String createURIString(String str) {
    try {
        URI uri = new URI(str);
        return uri.toASCIIString();
    } catch (URISyntaxException x) {
        throw new IllegalArgumentException(x.getMessage(), x);
    }
}

private static String convertJSONBodyToURL(String input){
    // input = "{ \"name\": \"Test\", \"java\": true}";

    ArrayList<String> arr = new ArrayList<String>();
    
    JsonObject jsonObject = new JsonParser().parse(input).getAsJsonObject();
    for (Entry<String, JsonElement> entry : jsonObject.entrySet()) {
        String key = entry.getKey();
        String value = entry.getValue().toString();
            // remove "', new URI would fail
            value = value.replace("\"", "").replace("'", "");
        
        // value sanity checks
        String valueURI = FixAPI.createURIString(value);
        
        // fail in case of problems
        if(valueURI == null){
            // err
            return null;
        }

        // if safe, add to array            
        arr.add(key + "=" + value);
    }
    
    // join array to String
    String joinedURLString = String.join("&", arr);
    
    return joinedURLString;
}