解决long类型数据返回前端丢失的问题

问题

        数据库中存的id是雪花算法生成的long类型id，但是查询到前端发现精度丢失了。如下图，

解决方法1（局部解决）

引用jackson-databind依赖

<dependency>
	<groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.13.4</version>
</dependency>

配置Long2StringSerializer

import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;

import java.io.IOException;

/**
 * description: 修改json，long类型转化成string，解决long返回前端丢失精度的问题
 */
public class Long2StringSerializer extends JsonSerializer<Long> {

    @Override
    public void serialize(Long value, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
        if (value != null) {
            jsonGenerator.writeString(value.toString());
        }
    }
}

要配置的long类型字段添加注解

@ApiModelProperty(value = "id")
@JsonSerialize(using = Long2StringSerializer.class)
private Long id;

解决方法2

配置ObjectMapper

 @Bean
 public ObjectMapper objectMapper(){
     ObjectMapper objectMapper = new ObjectMapper();
     JavaTimeModule javaTimeModule = new JavaTimeModule();
     //解决long类型到前端精度丢失的问题
     javaTimeModule.addSerializer(Long.class, ToStringSerializer.instance);
     javaTimeModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
     objectMapper.registerModule(javaTimeModule);
     return objectMapper;
 }

结果

        配置到这里就可以看到数据返回结果精度正常了。