巧用fastjson自定义序列化类实现字段的转换

@Data
public class SysDictItemSelectVo implements Serializable{

    private static final long serialVersionUID = 1L;
    @JSONField(serializeUsing=ToSystemNameSerializer.class)
    private String systemName;

    public String getSystemName(){
        return this.getCode();
    }
    }

import com.alibaba.fastjson.serializer.JSONSerializer;
import com.alibaba.fastjson.serializer.ObjectSerializer;
import com.alibaba.fastjson.serializer.SerializeWriter;

import java.io.IOException;
import java.lang.reflect.Type;

public    class ToSystemNameSerializer implements ObjectSerializer {

    public static final  ToSystemNameSerializer instance = new  ToSystemNameSerializer();

    @Override
    public void write(JSONSerializer serializer, Object object, Object fieldName, Type fieldType,
                      int features) throws IOException {
        SerializeWriter out = serializer.out;

        if (object == null) {
            out.writeNull();
            return;
        }

        //原来的值code
        String strVal = object.toString();
        System.out.println(strVal);
        //通过code查找相关名称，测试先写死值 
        String name="std";
        out.writeString(name);

    }
}