SpringBoot构建电商基础秒杀项目知识点总结(第2章)

---

2-1 使用IDEA创建MAVEN项目

1.创建项目:

若是Springboot项目,直接采用quickstart方式,创建的是一个以jar包方式对外提供统一输出的项目.
若不是springboot项目则采用第二种方式,创建的是一种可以以war包方式部署在tomcat或jboss这种web的j2ee容器里面.

2-2 引入SpringBoot依赖包实现简单的WEB项目

1.添加依赖:在springboot官网找

  <parent>
    <groupId>org.springframework.bootgroupId>
    <artifactId>spring-boot-starter-parentartifactId>
    <version>2.1.4.RELEASEversion>
  parent>

    <dependency>
      <groupId>org.springframework.bootgroupId>
      <artifactId>spring-boot-starter-webartifactId>
    dependency>

2-3 Mybatis接入SpringBoot项目

1.使用springboot搭建web项目

@SpringBootApplication(scanBasePackages = {"com.seckillproject"})
@RestController
@MapperScan("com.seckillproject.dao")
public class  App {
    public static void main(String[] args) {
        SpringApplication.run(App.class, args);
    }
}

@EnableAutoConfiguration:将app这个启动类变成自动化可以支持springboot配置的bean,并且开启整个项目基于springboot的自动化配置,包括启动内嵌的tomcat并加载默认名配置
@SpringBootApplication:与@EnableAutoConfiguration效果相同,另外可以指定需要扫描的根目录包,能够通过注解的方式自动发现springboot特定的注解(@component,@service,@controller,@Repository).
@RestController:可以使用spring MVC的功能
@MapperScan:dao存放的地方
SpringApplication.run(App.class, args);:用于启动该springboot项目

2.Mybatis接入SpringBoot项目

引入mybatis相关依赖

    <!--数据库:此connector是mysql的java client端-->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.41</version>
    </dependency>
    <!--数据库连接池:用于管理mysql连接-->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.1.3</version>
    </dependency>
    <!--Mybatis依赖:mybatis对springboot的支持文件-->
    <dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>1.3.1</version>
    </dependency>

在application.properties中引入mybatis配置,用来启动带mybatis数据库访问的springboot项目

server.port=8080
mybatis.mapper-locations=classpath:mapping/*.xml

spring.datasource.name=seckill
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/seckill?useUnicode=true&characterEncoding=UTF-8&useSSL=false&serverTimezone=UTC
spring.datasource.username=root
spring.datasource.password=root


spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

2-4 Mybatis自动生成器使用方式

1.配置mybatis自动生成工具:mybatis generator

        
        <plugin>
          <groupId>org.mybatis.generatorgroupId>
          <artifactId>mybatis-generator-maven-pluginartifactId>
          <version>1.3.5version>
          <dependencies>
            <dependency>
              <groupId>org.mybatis.generatorgroupId>
              <artifactId>mybatis-generator-coreartifactId>
              <version>1.3.5version>
            dependency>
            <dependency>
              <groupId>mysqlgroupId>
              <artifactId>mysql-connector-javaartifactId>
              <version>5.1.41version>
            dependency>
          dependencies>
          <executions>
            <execution>
              <id>mybatis generatorid>
              <phase>packagephase>
              <goals>
                <goal>generategoal>
              goals>
            execution>
          executions>
          <configuration>
            
            <verbose>trueverbose>
            
            <overwrite>falseoverwrite>
            <configurationFile>
              src/main/resources/mybatis-generator.xml
            configurationFile>
          configuration>
        plugin>

2.编写mybatis generator文件:可以在官网下载

DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>
	
    <context id="DB2Tables" targetRuntime="MyBatis3">
        
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/seckill"
                        userId="root"
                        password="root">
        jdbcConnection>

        
        <javaModelGenerator targetPackage="com.seckillproject.dataobject" targetProject="src/main/java">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        javaModelGenerator>

        
        <sqlMapGenerator targetPackage="mapping"  targetProject="src/main/resources">
            <property name="enableSubPackages" value="true" />
        sqlMapGenerator>

        
        
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.seckillproject.dao"  targetProject="src/main/java">
            <property name="enableSubPackages" value="true" />
        javaClientGenerator>

        
        <table tableName="user_info" domainObjectName="UserDO"
               enableCountByExample="false"
               enableUpdateByExample="false"
               enableDeleteByExample="false"
               enableSelectByExample="false"
               selectByExampleQueryId="false" >table>
    context>
generatorConfiguration>

3.创建数据库

-utf-8不包含表情符号(数据库设计)

密码是加密的字符串,一般不和用户信息主表创建在一起.在企业级项目中,密码托管一般是另一个项目实现.至少在数据库级别,密码和用户信息需要分开存取