Spring中入参，出参时间戳，LocalDateTime转换

目录

• 提供ObjectMapper
• 提供MappingJackson2HttpMessageConverter
• 入参时间戳转换为LocalDateTime
• 返回体LocalDateTime转换为时间戳

提供ObjectMapper

import cn.hutool.core.date.DateUtil;
import cn.hutool.core.date.LocalDateTimeUtil;
import com.fasterxml.jackson.annotation.JsonInclude;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.*;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.io.IOException;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;

/**
 * @author qhong
 * @date 2021/11/5 12:20
 **/
@Configuration
public class LocalDateTimeSerializerConfig {

    /**
     * 序列化LocalDateTime
     *
     * @return
     */
    @Bean(value = "localDateTimeObjectMapper")
    public ObjectMapper serializingObjectMapper() {
        ObjectMapper objectMapper = new ObjectMapper();

        // 通过该方法对mapper对象进行设置，所有序列化的对象都将按改规则进行系列化
        // Include.Include.ALWAYS 默认
        // Include.NON_DEFAULT 属性为默认值不序列化
        // Include.NON_EMPTY 属性为 空（""） 或者为 NULL 都不序列化，则返回的json是没有这个字段的。这样对移动端会更省流量
        // Include.NON_NULL 属性为NULL 不序列化
        objectMapper.setSerializationInclusion(JsonInclude.Include.ALWAYS);
        // 允许忽略多传入的字段，直接忽略
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        // 允许出现特殊字符和转义符
        objectMapper.configure(JsonParser.Feature.ALLOW_UNQUOTED_CONTROL_CHARS, true);
        // 允许出现单引号
        objectMapper.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
        // 兼容反斜杠，允许接受引号引起来的所有字符
        objectMapper.configure(JsonParser.Feature.ALLOW_BACKSLASH_ESCAPING_ANY_CHARACTER, true);
        JavaTimeModule javaTimeModule = new JavaTimeModule();
        javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer());
        javaTimeModule.addDeserializer(LocalDateTime.class, new LocalDateTimeDeserializer());
        objectMapper.registerModule(javaTimeModule);
        return objectMapper;
    }

    /**
     * 序列化实现
     */
    public static class LocalDateTimeSerializer extends JsonSerializer<LocalDateTime> {
        @Override
        public void serialize(LocalDateTime value, JsonGenerator gen, SerializerProvider serializers)
                throws IOException {
            if (value != null) {
                long timestamp = value.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli();
                gen.writeNumber(timestamp);
            }
        }
    }

    /**
     * 反序列化实现
     */
    public static class LocalDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {
        @Override
        public LocalDateTime deserialize(JsonParser p, DeserializationContext deserializationContext)
                throws IOException {
            long timestamp = p.getValueAsLong();
            if (timestamp > 0) {
                return LocalDateTime.ofInstant(Instant.ofEpochMilli(timestamp), ZoneId.systemDefault());
            } else {
                //兼容字符串格式时间传入
                String value = p.getValueAsString();
                return LocalDateTimeUtil.of(DateUtil.parse(value));
            }
        }
    }
}

可以直接使用@Primary，强制整个系统使用上面的ObjectMapper，但是会出现与其他jar定义ObjectMapper冲突

提供MappingJackson2HttpMessageConverter

import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;

import javax.annotation.Resource;
import java.nio.charset.Charset;
import java.util.LinkedList;
import java.util.List;

/**
 * @author qhong
 * @date 2022/4/14 19:52
 **/
@Configuration
public class MessageConverterConfig {

    @Resource(name = "localDateTimeObjectMapper")
    public ObjectMapper objectMapper;

    /**
     * 使用jackson序列化消息转换
     */
    @Bean
    public MappingJackson2HttpMessageConverter fastJsonHttpMessageConverters() {
        MappingJackson2HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter();
        messageConverter.setDefaultCharset(Charset.defaultCharset());
        messageConverter.setObjectMapper(objectMapper);

        //支持的媒体类型
        List<MediaType> supportedMediaTypes = new LinkedList<>();
        supportedMediaTypes.add(MediaType.APPLICATION_JSON_UTF8);

        //页面直接请求的类型(这里是新增加的支持的匹配的类型,页面访问的时候类型为text/html)
        supportedMediaTypes.add(MediaType.TEXT_HTML);

        messageConverter.setSupportedMediaTypes(supportedMediaTypes);
        //@formatter:on
        return messageConverter;
    }
}

入参时间戳转换为LocalDateTime

import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import javax.annotation.Resource;
import java.util.List;

/**
 * @author qhong
 * @date 2022/4/14 19:50
 **/
@Configuration
public class MessageConverterOrderWebMvcConfigurer implements WebMvcConfigurer {

    @Resource
    private MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter;

    @Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {

        //方法一:把jackson解析器放在第一位,这样匹配完了之后,就会直接返回;[是否匹配和我们解析器支持的类型有关[supportedMediaTypes]详细见源码
        // org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor#writeWithMessageConverters]
        converters.add(0, mappingJackson2HttpMessageConverter);
    }
}

返回体LocalDateTime转换为时间戳

import com.alibaba.fastjson.JSONObject;
import com.qhong.test.common.ResultBase;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.MethodParameter;
import org.springframework.core.annotation.Order;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;

/**
 * @author qhong
 * @date 2022/4/14 19:50
 **/
@Slf4j
//这里尽量让加密的判断优先级更低一点(请求的时候,加密的优先级高一点
@Order(1)
@RestControllerAdvice
public class ResponseHandle implements ResponseBodyAdvice<Object> {

    @Autowired
    private MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter;

    /**
     * 是否支持此消息响应处理器
     *
     * @return boolean
     * @Param methodParameter
     * @Param aClass
     * @author peikunkun
     * @date 2021/1/6 0006 下午 4:29
     * @since
     */
    @Override
    public boolean supports(MethodParameter methodParameter, Class<? extends HttpMessageConverter<?>> aClass) {
        return true;
    }

    /**
     * 在选择HttpMessageConverter之后且在调用其write方法之前调用。
     * <p>
     * 参数：正文–要写的正文
     * returnType –控制器方法的返回类型
     * selectedContentType –通过内容协商选择的内容类型
     * selectedConverterType –选择要写入响应的转换器类型
     * 请求–当前请求
     * 响应–当前响应
     * 返回值：
     * 传入的正文或经过修改的（可能是新的）实例
     */
    @SneakyThrows
    @Override
    public Object beforeBodyWrite(Object resBody, MethodParameter methodParameter, MediaType mediaType,
                                  Class<? extends HttpMessageConverter<?>> aClass, ServerHttpRequest serverHttpRequest,
                                  ServerHttpResponse serverHttpResponse) {
        try {
            if (resBody instanceof ResultBase) {
                return JSONObject.parseObject(mappingJackson2HttpMessageConverter.getObjectMapper().writeValueAsString(resBody), ResultBase.class);
            }
        } catch (Exception e) {
            log.warn("ResponseHandle Return Error", e);
        }
        return resBody;
    }
}