消息类型转换序列化与反序列化

序列化

• BigInteger、Long转换成String
• LocalDateTime、LocalDate、LocalTime转换成指定格式

反序列化

• 从指定格式数据反序列化成LocalDateTime、LocalDate、LocalTime类型数据

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.json.JsonReadFeature;
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.deser.LocalDateDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalTimeDeserializer;
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 lombok.extern.slf4j.Slf4j;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import java.math.BigInteger;
import java.text.SimpleDateFormat;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import java.util.Locale;
import java.util.TimeZone;

@Slf4j
@Configuration
public class WebMvcConfig implements WebMvcConfigurer {

    public static final String DEFAULT_DATE_FORMAT = "yyyy-MM-dd";
    public static final String DEFAULT_DATE_TIME_FORMAT = "yyyy-MM-dd HH:mm:ss";
    public static final String DEFAULT_TIME_FORMAT = "HH:mm:ss";

    @Bean
    @Primary
    @ConditionalOnClass(ObjectMapper.class)
    @ConditionalOnMissingBean
    public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder) {
        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
        objectMapper
                .setLocale(Locale.CHINA)
                //去掉默认的时间戳格式
                .configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false)
                // 时区
                .setTimeZone(TimeZone.getTimeZone(ZoneId.systemDefault()))
                //Date参数日期格式
                .setDateFormat(new SimpleDateFormat(DEFAULT_DATE_TIME_FORMAT, Locale.CHINA))
                //该特性决定parser是否允许JSON字符串包含非引号控制字符（值小于32的ASCII字符，包含制表符和换行符）。 如果该属性关闭，则如果遇到这些字符，则会抛出异常。JSON标准说明书要求所有控制符必须使用引号，因此这是一个非标准的特性
                .configure(JsonReadFeature.ALLOW_UNESCAPED_CONTROL_CHARS.mappedFeature(), true)
                // 忽略不能转义的字符
                .configure(JsonReadFeature.ALLOW_BACKSLASH_ESCAPING_ANY_CHARACTER.mappedFeature(), true)
                //在使用spring boot + jpa/hibernate，如果实体字段上加有FetchType.LAZY，并使用jackson序列化为json串时，会遇到SerializationFeature.FAIL_ON_EMPTY_BEANS异常
                .configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false)
                //忽略未知字段
                .configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false)
                //单引号处理
                .configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
        SimpleModule simpleModule = new SimpleModule()
                .addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)))
                .addDeserializer(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)))
                .addDeserializer(LocalTime.class, new LocalTimeDeserializer(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)))

                .addSerializer(BigInteger.class, ToStringSerializer.instance)
                .addSerializer(Long.class, ToStringSerializer.instance)
                .addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_TIME_FORMAT)))
                .addSerializer(LocalDate.class, new LocalDateSerializer(DateTimeFormatter.ofPattern(DEFAULT_DATE_FORMAT)))
                .addSerializer(LocalTime.class, new LocalTimeSerializer(DateTimeFormatter.ofPattern(DEFAULT_TIME_FORMAT)));
        // 注册自定义模块
        objectMapper.registerModule(simpleModule).findAndRegisterModules();

        return objectMapper;
    }


}