解决java Long转json精度丢失的问题、MVC 返回前端的 long 类型数据转换为 String 数据

package baselib.cunyt.cn.common.mvc;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;
import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;

import java.math.BigInteger;

/**
 * 解决java Long转json精度丢失的问题
 *
 * @author wupeiguo
 */

@Configuration
public class ApiMvcConfiguration {

    @Bean
    @Primary
    @ConditionalOnMissingBean(ObjectMapper.class)
    public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder)
    {
        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
        // 全局配置序列化返回 JSON 处理
        SimpleModule simpleModule = new SimpleModule();
        //JSON Long ==> String
        //超长整
        simpleModule.addSerializer(BigInteger.class, ToStringSerializer.instance);
        //长整
        simpleModule.addSerializer(Long.class,ToStringSerializer.instance);
        //长整
        simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
        objectMapper.registerModule(simpleModule);
        return objectMapper;
    }
}