SpringBoot自定義Jackson配置

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為了在SpringBoot工程中集中解決long類型轉成json時JS丟失精度問題和統一設置常見日期類型序列化格式，我們可以自定義Jackson配置類，具體如下：

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.DateSerializer;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.text.SimpleDateFormat;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.Date;

/**
 * 自定義jackson配置
 * 1.解決long類型轉成json時JS丟失精度問題
 * 2.統一設置常見日期類型序列化格式
 */
@Configuration
public class JacksonConfig {

    @Bean
    public ObjectMapper objectMapper() {
        // 序列換成json時,將所有的long變成string
        SimpleModule simpleModule = new SimpleModule();
        simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
        simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);

        // 日期序列化設置
        JavaTimeModule javaTimeModule = new JavaTimeModule();
        javaTimeModule.addSerializer(Date.class, new DateSerializer(false, new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")));
        javaTimeModule.addSerializer(LocalDateTime.class, new LocalDateTimeSerializer(DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss")));

        return new ObjectMapper().registerModule(simpleModule)
                                 .registerModule(javaTimeModule);
    }
}