Note that JsonHttpContent class from com.google.http-client/google-http-client-gson does not support the full feature set of Gson library.
Instead it just relies on the JsonParser provided by Gson.
Code snippet below provides a bridge between full featured Gson/GsonBuilder and Google HTTP Client.
See https://stackoverflow.com/questions/34690059/configuring-the-gsonfactory-of-google-http-client
package com.example.project;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.nio.charset.StandardCharsets;
import java.lang.UnsupportedOperationException;
import com.google.api.client.http.AbstractHttpContent;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
public final class HttpJsonContent extends AbstractHttpContent {
private static final Gson gson = new GsonBuilder()
.create();
private String jsonString;
protected HttpJsonContent(String jsonString) {
super("application/json; charset=UTF-8");
// NOTE This is memory inefficient implementation
this.jsonString = jsonString;
}
public static HttpJsonContent fromString(String jsonString) {
return new HttpJsonContent(jsonString);
}
public static HttpJsonContent fromBytes(byte[] bytes) {
return new HttpJsonContent(new String(bytes, StandardCharsets.UTF_8));
}
public static HttpJsonContent fromGson(Object gsonObject) {
return new HttpJsonContent(gson.toJson(gsonObject));
}
public static HttpJsonContent fromJackson(Object jacksonObject) {
throw new UnsupportedOperationException("Jackson JSON serializer is not yet supported.");
}
@Override
public void writeTo(OutputStream out) throws IOException {
try (Writer w = new OutputStreamWriter(out, StandardCharsets.UTF_8)) {
w.write(this.jsonString);
}
}
}