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调用 String ua = request.getHeader("User-Agent"); if (StringUtil.checkAgentIsMobile(ua)) { System.out.println("来自移动端访问"); } else { System.out.println("来 阅读全文
posted @ 2021-07-20 16:44
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/** * BigDecimal 保留两位小数进行对比 */ public class BigDecimalTest { public static void main(String[] args) { BigDecimal big1 = new BigDecimal("3.14"); BigDec 阅读全文
posted @ 2021-07-20 16:42
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示例代码 import com.alibaba.fastjson.JSON; import com.example.demo.Demo.dto.Student; import com.example.demo.pojo.StudentPlus; import java.util.ArrayList; 阅读全文
posted @ 2021-07-20 16:39
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报错 com.mongodb.MongoCommandException: Command failed with error 48 (NamespaceExists): 'a collection 'mapMongoDB.macCode01' already exists' on server l 阅读全文
posted @ 2021-07-20 10:52
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摘要 插入摘要右侧图片 阅读全文
posted @ 2021-07-20 10:45
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