import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalTimeSerializer;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.util.TimeZone;

@Configuration
public class JacksonConfig {

/**
 * 配置jackson
 *
 * @return ObjectMapper
 */
@Bean
public ObjectMapper objectMapper() {
    ObjectMapper objectMapper = new ObjectMapper();
    //忽略null值
    objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
    //忽略对象中没有的值
    objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

    //设置全局的时间转化
    objectMapper.setDateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));
    objectMapper.setTimeZone(TimeZone.getTimeZone("GMT+8"));//解决时区差8小时问题
    //long 转 string
    SimpleModule simpleModule = new SimpleModule();
    simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
    simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
    objectMapper.registerModule(simpleModule);

    //localDataTime
    JavaTimeModule javaTimeModule = new JavaTimeModule();
    javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
    javaTimeModule.addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
    javaTimeModule.addSerializer(LocalTime.class, new LocalTimeSerializer(DateTimeFormatter.ofPattern("HH:mm:ss")));
    objectMapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    objectMapper.registerModule(javaTimeModule);
    return objectMapper;
}

/**
 * Jackson全局转化long类型为String，解决jackson序列化时long类型缺失精度问题
 *
 * @return Jackson2ObjectMapperBuilderCustomizer 注入的对象
 */
@Bean
public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {

    return jacksonObjectMapperBuilder
            -> jacksonObjectMapperBuilder
            .serializerByType(Long.TYPE, ToStringSerializer.instance);
}

}