JacksonTypeInfoTest.java

package com.adzcentral.core.service;

import java.io.IOException;
import java.util.Map;

import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.databind.ObjectMapper;
import lombok.Getter;
import lombok.Setter;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.junit.runners.BlockJUnit4ClassRunner;

@RunWith(BlockJUnit4ClassRunner.class)
public class JacksonTypeInfoTest {

    @Test
    public void test() throws IOException {

        ObjectMapper objectMapper = new ObjectMapper();
        //objectMapper.enableDefaultTypingAsProperty(ObjectMapper.DefaultTyping.JAVA_LANG_OBJECT, "@class");

        A whiteLabel = new A();
        whiteLabel.setResourceId(1);
        whiteLabel.setResourceType((short) 1);
        whiteLabel.setContentType("image/jpg");

        String json = objectMapper.writeValueAsString(whiteLabel);
        System.out.println(json);
        Object l2 = objectMapper.readValue(json, I.class);

        System.out.println(l2.getClass());
        System.out.println(l2);

        Object l3 = objectMapper.readValue(json, Map.class);
        System.out.println(l3.getClass());
        System.out.println(l3);
    }

    @Getter
    @Setter
    @JsonTypeInfo(use = JsonTypeInfo.Id.CLASS, include = JsonTypeInfo.As.PROPERTY)
    static class A implements I {
        private int resourceId;
        private int resourceType;
        private String contentType;
    }

    @JsonTypeInfo(use = JsonTypeInfo.Id.CLASS)
    interface I {

    }
}