java-tutorials/json-2/src/main/java/com/baeldung/jsontojavaclass/JsonToJavaClassConversion.java

package com.baeldung.jsontojavaclass;

import java.io.File;
import java.io.IOException;
import java.net.URL;

import org.jsonschema2pojo.DefaultGenerationConfig;
import org.jsonschema2pojo.GenerationConfig;
import org.jsonschema2pojo.Jackson2Annotator;
import org.jsonschema2pojo.SchemaGenerator;
import org.jsonschema2pojo.SchemaMapper;
import org.jsonschema2pojo.SchemaStore;
import org.jsonschema2pojo.SourceType;
import org.jsonschema2pojo.rules.RuleFactory;

import com.sun.codemodel.JCodeModel;

public class JsonToJavaClassConversion {

    public Object convertJsonToJavaClass(URL inputJson, File outputJavaClassDirectory, String packageName, String className) throws IOException {
        JCodeModel jcodeModel = new JCodeModel();

        GenerationConfig config = new DefaultGenerationConfig() {
            @Override
            public boolean isGenerateBuilders() {
                return true;
            }

            @Override
            public SourceType getSourceType() {
                return SourceType.JSON;
            }
        };

        SchemaMapper mapper = new SchemaMapper(new RuleFactory(config, new Jackson2Annotator(config), new SchemaStore()), new SchemaGenerator());
        mapper.generate(jcodeModel, className, packageName, inputJson);

        jcodeModel.build(outputJavaClassDirectory);
        return mapper;
    }

}