SpringBoot - 后端数据返回前端各个数据类型全局格式化

全局配置

java 复制代码

import com.fasterxml.jackson.annotation.JsonInclude;
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 org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.math.BigDecimal;
import java.time.LocalDateTime;

/**
 * @author Lux Sun
 * @date 2023/8/27
 */
@Configuration
public class MyObjectMapperConfig {

    @Bean
    public ObjectMapper objectMapper() {
        ObjectMapper objectMapper = new ObjectMapper();

        // 设置序列化时忽略为null的字段
        objectMapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);

        // 注册自定义的BigDecimalSerializer
        objectMapper.registerModule(new SimpleModule()
                .addSerializer(BigDecimal.class, new BigDecimalSerializerConfig())
                .addSerializer(LocalDateTime.class, new LocalDateTimeSerializerConfig()));

        return objectMapper;
    }
}

BigDecimal 数据类型

java 复制代码

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.szqy.common.domain.basic.OpenTime;
import java.io.IOException;
import java.math.BigDecimal;

public class BigDecimalSerializerConfig extends JsonSerializer<BigDecimal> {
    @Override
    public void serialize(BigDecimal value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
        if (value != null) {
            // 设置保留两位小数，并保留末尾的".00"
            Object currentValue = gen.getCurrentValue();
            String formattedValue = value.setScale(2, BigDecimal.ROUND_HALF_UP).toString();
            if (currentValue instanceof OpenTime) {
                // 设置保留两位小数，并去除末尾的".00"
                formattedValue = value.setScale(2, BigDecimal.ROUND_HALF_UP).stripTrailingZeros().toPlainString();
            }
            gen.writeString(formattedValue);
        }
    }
}

LocalDateTime 数据类型

java 复制代码

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import java.io.IOException;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class LocalDateTimeSerializerConfig extends JsonSerializer<LocalDateTime> {

    private final DateTimeFormatter dateTimeFormat = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");

    @Override
    public void serialize(LocalDateTime dateTime, JsonGenerator generator, SerializerProvider sp)
            throws IOException {
        String formattedDateTime = dateTime.format(dateTimeFormat);
        generator.writeString(formattedDateTime);
    }
}