Jackson自定义日期格式化程序

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;

import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class CustomDateSerializer extends JsonSerializer<Date> {

    private static final SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");

    @Override
    public void serialize(Date date, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
        String formattedDate = dateFormat.format(date);
        jsonGenerator.writeString(formattedDate);
    }
}

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;

import java.util.Date;

public class Main {

    public static void main(String[] args) throws Exception {
        ObjectMapper objectMapper = new ObjectMapper();
        SimpleModule module = new SimpleModule();
        module.addSerializer(Date.class, new CustomDateSerializer());
        objectMapper.registerModule(module);

        // 将对象转换为JSON字符串
        MyObject myObject = new MyObject();
        myObject.setDate(new Date());
        String json = objectMapper.writeValueAsString(myObject);
        System.out.println(json);
    }
}