记录一下ObjectMapper解析LoaclDateTime时间格式的问题

添加依赖

  <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-jsr310</artifactId>
            <version>2.10.2</version>
            <scope>compile</scope>
        </dependency>

创建一个全局配置类

import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

/**
 * @Author ZhengQinfeng
 * @Date 2020/7/19 21:28
 * @dec
 */
@Configuration
public class LocalDateTimeSerializerConfig {

    @Bean
    public LocalDateTimeSerializer localDateTimeSerializer() {
        return new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
    }

    @Bean
    public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
        return builder -> builder.serializerByType(LocalDateTime.class, localDateTimeSerializer());
    }
}

创建ObjectMapper工具类

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
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 java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.List;

/**
 * @Author ZhengQinfeng
 * @Date 2020/5/23 16:03
 * @dec
 */
public class AppJsonUtil {
    private static ObjectMapper mapper = new ObjectMapper();

    static {
        // 转换为格式化的json
        mapper.enable(SerializationFeature.INDENT_OUTPUT);

        // 如果json中有新增的字段并且是实体类类中不存在的，不报错
        mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

        // 下面配置解决LocalDateTime序列化的问题
        mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
        JavaTimeModule javaTimeModule = new JavaTimeModule();

        //日期序列化
        //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")));

        //日期反序列化
        //javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));
        //javaTimeModule.addDeserializer(LocalDate.class, new LocalDateDeserializer(DateTimeFormatter.ofPattern("yyyy-MM-dd")));
        //javaTimeModule.addDeserializer(LocalTime.class, new LocalTimeDeserializer(DateTimeFormatter.ofPattern("HH:mm:ss")));

        mapper.registerModule(javaTimeModule);
    }


    public static <T> String toJSONStr(T t) {
        try {
            return mapper.writeValueAsString(t);
        } catch (JsonProcessingException e) {
            throw new RuntimeException("parse obj to json string error");
        }
    }

    public static <T, R> R convert(T t, Class<R> r) {
        try {
            String temp = mapper.writeValueAsString(t);
            return mapper.readValue(temp, r);
        } catch (JsonProcessingException e) {
            e.printStackTrace();
            throw new RuntimeException("convert data type error");
        }
    }

    public static <T, R> List<R> convert(List<T> sources, Class<R> r) {
        List<R> result = new ArrayList<>(sources.size());
        try {
            for (T source : sources) {
                result.add(mapper.readValue(mapper.writeValueAsString(source), r));
            }
        } catch (Exception e) {
            e.printStackTrace();
            throw new RuntimeException("convert list to another list error");
        }
        return result;
    }
}