请问老师为什么在没有加synchronized的时候，是后请求的浏览器获得了数据，先请求的反而没有。

老师，麻烦帮忙分析一下下题中求特征向量的详细过程，没搞明白矩阵是怎么转换过去的 

{：，}.format(10000000)

{:,}.format(10000000)

SyntaxError: invalid syntax

老师这个为什么报错啊，不是可以用逗号隔开吗？

老师，麻烦看下这个报错怎么解决，安装“flask_sqlalchemy”时报的错

老师，我打开项目之后就发现启动类出现错误，我该怎么处理呀

我看视频里面pom文件中没有添加这段代码

<dependency>
    <groupId>com.bjsxt</groupId>
    <artifactId>springbootjdbc</artifactId>
    <version>0.0.1-SNAPSHOT</version>
</dependency>

然后我删除了这段依赖后访问页面报错，这是为什么？

org.thymeleaf.exceptions.TemplateInputException: Error resolving template [addUser]

为什么这里不需要返回值

这个界面是怎么出来的...............

能重新发一下吗

老师，您好

我在网页先创建了9个id，之后将id为2345678的删除，重新创建一个新的此时的id就为10，

请问老师有什么办法能让id重新生成23456么

为什么在调用study()时报错啊，错误提示需要一个）是要加在哪里的

请问老师，在PriorityQueue中，数字间、字符串间、元组间、列表间均可以进行优先级比较，为什么字典不行，把字典的“键”均设成数字也不能进行优先级比较，是因为字典是无序的原因吗？

老师这个pom.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.bjsxt</groupId>
    <artifactId>Ting</artifactId>
    <version>1.0-SNAPSHOT</version>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.1.RELEASE</version>
        <relativePath />
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <shiro.version>1.4.2</shiro.version>
        <thymeleaf.extras.shiro.version>2.0.0</thymeleaf.extras.shiro.version>
        <mybatis.spring.boot.starter.version>1.3.2</mybatis.spring.boot.starter.version>
        <pagehelper.spring.boot.starter.version>1.2.5</pagehelper.spring.boot.starter.version>
        <fastjson.version>1.2.60</fastjson.version>
        <druid.version>1.1.14</druid.version>
        <commons.io.version>2.5</commons.io.version>
        <commons.fileupload.version>1.3.3</commons.fileupload.version>
        <bitwalker.version>1.19</bitwalker.version>
        <lombok.version>1.16.18</lombok.version>
        <velocity.version>1.7</velocity.version>
        <kaptcha.version>2.3.2</kaptcha.version>
        <swagger.version>2.9.2</swagger.version>
        <poi.version>3.17</poi.version>
        <oshi.version>3.9.1</oshi.version>
    </properties>

    <dependencies>

        <!-- SpringBoot 核心包 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <!--
             <exclusions>
                <exclusion>
                    <artifactId>spring-boot-starter-tomcat</artifactId>
                    <groupId>org.springframework.boot</groupId>
                </exclusion>
            </exclusions>
             -->
        </dependency>

        <!-- SpringBoot 测试 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- SpringBoot 拦截器 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-aop</artifactId>
        </dependency>

        <!-- SpringBoot Web容器 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- SpringBoot集成thymeleaf模板 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <!-- spring-boot-devtools -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional> <!-- 表示依赖不会传递 -->
        </dependency>

        <!-- Mysql驱动包 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <!-- SpringBoot集成mybatis框架 -->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>${mybatis.spring.boot.starter.version}</version>
        </dependency>

        <!-- pagehelper 分页插件 -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>${pagehelper.spring.boot.starter.version}</version>
        </dependency>

        <!--阿里数据库连接池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>${druid.version}</version>
        </dependency>

        <!--常用工具类 -->
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
        </dependency>

        <!--io常用工具类 -->
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>${commons.io.version}</version>
        </dependency>

        <!--文件上传工具类 -->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>${commons.fileupload.version}</version>
        </dependency>

        <!--Shiro核心框架 -->
        <dependency>
            <groupId>org.apache.shiro</groupId>
            <artifactId>shiro-core</artifactId>
            <version>${shiro.version}</version>
        </dependency>

        <!-- Shiro使用Srping框架 -->
        <dependency>
            <groupId>org.apache.shiro</groupId>
            <artifactId>shiro-spring</artifactId>
            <version>${shiro.version}</version>
        </dependency>

        <!-- Shiro使用EhCache缓存框架 -->
        <dependency>
            <groupId>org.apache.shiro</groupId>
            <artifactId>shiro-ehcache</artifactId>
            <version>${shiro.version}</version>
        </dependency>

        <!-- thymeleaf模板引擎和shiro框架的整合 -->
        <dependency>
            <groupId>com.github.theborakompanioni</groupId>
            <artifactId>thymeleaf-extras-shiro</artifactId>
            <version>${thymeleaf.extras.shiro.version}</version>
        </dependency>

        <!-- 阿里JSON解析器 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>${fastjson.version}</version>
        </dependency>

        <!-- 解析客户端操作系统、浏览器等 -->
        <dependency>
            <groupId>eu.bitwalker</groupId>
            <artifactId>UserAgentUtils</artifactId>
            <version>${bitwalker.version}</version>
        </dependency>

        <!--Spring框架基本的核心工具-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
        </dependency>

        <!-- 定时任务 -->
        <dependency>
            <groupId>org.quartz-scheduler</groupId>
            <artifactId>quartz</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>com.mchange</groupId>
                    <artifactId>c3p0</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!--velocity代码生成使用模板 -->
        <dependency>
            <groupId>org.apache.velocity</groupId>
            <artifactId>velocity</artifactId>
            <version>${velocity.version}</version>
        </dependency>

        <!--验证码 -->
        <dependency>
            <groupId>com.github.penggle</groupId>
            <artifactId>kaptcha</artifactId>
            <version>${kaptcha.version}</version>
            <exclusions>
                <exclusion>
                    <artifactId>javax.servlet-api</artifactId>
                    <groupId>javax.servlet</groupId>
                </exclusion>
            </exclusions>
        </dependency>

        <!-- swagger2-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>${swagger.version}</version>
            <exclusions>
                <exclusion>
                    <groupId>io.swagger</groupId>
                    <artifactId>swagger-annotations</artifactId>
                </exclusion>
                <exclusion>
                    <groupId>io.swagger</groupId>
                    <artifactId>swagger-models</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

        <!--防止进入swagger页面报类型转换错误，排除2.9.2中的引用，手动增加1.5.21版本-->
        <dependency>
            <groupId>io.swagger</groupId>
            <artifactId>swagger-annotations</artifactId>
            <version>1.5.21</version>
        </dependency>

        <dependency>
            <groupId>io.swagger</groupId>
            <artifactId>swagger-models</artifactId>
            <version>1.5.21</version>
        </dependency>

        <!-- swagger2-UI-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>${swagger.version}</version>
        </dependency>

        <!-- 获取系统信息 -->
        <dependency>
            <groupId>com.github.oshi</groupId>
            <artifactId>oshi-core</artifactId>
            <version>${oshi.version}</version>
        </dependency>

        <dependency>
            <groupId>net.java.dev.jna</groupId>
            <artifactId>jna</artifactId>
        </dependency>

        <dependency>
            <groupId>net.java.dev.jna</groupId>
            <artifactId>jna-platform</artifactId>
        </dependency>

        <!-- excel工具 -->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>${poi.version}</version>
        </dependency>

    </dependencies>

    <build>
        <finalName>${project.artifactId}</finalName>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <fork>true</fork> <!-- 如果没有该配置，devtools不会生效 -->
                </configuration>
            </plugin>
        </plugins>
    </build>



</project>