Spring Boot返回前端Long型丢失精度 后两位 变成00，使用 Jackson2框架

Spring Boot返回前端Long型丢失精度 后两位 变成00

将long转换为字符串即可；

下面使用 Jackson2框架：

import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
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.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

import java.util.List;

@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/admin/**")//
                .allowedOrigins(
                        "http://127.0.0.1:8080", "http://192.168.1.107:3001",
                        "http://xxx.xxx.net"
                )
                .allowedHeaders("*")//
                .allowedMethods("POST", "GET", "PUT", "OPTIONS", "DELETE")//
                .maxAge(3600);
    }

    @Override
    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
        MappingJackson2HttpMessageConverter jackson2HttpMessageConverter = new MappingJackson2HttpMessageConverter();
        ObjectMapper objectMapper = new ObjectMapper();
        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        /**
         * 序列换成json时,将所有的long变成string
         * 因为js中得数字类型不能包含所有的java long值
         */
        SimpleModule simpleModule = new SimpleModule();
        simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
        simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
        objectMapper.registerModule(simpleModule);
        jackson2HttpMessageConverter.setObjectMapper(objectMapper);
        converters.add(0, jackson2HttpMessageConverter);
    }

}