SpringBoot构建电商基础秒杀项目总结

2023-12-25 18:48:22

一、电商秒杀应用简介

商品列表页获取秒杀商品列表
进入商品详情页获取秒杀商品详情
秒杀开始后进入下单确认页下单并支付成功

一、SpringBoot搭建项目

1、创建项目

2、修改pom.xml文件

官方文档：https://spring.io/guides/gs/rest-service/

2.1 添加父pom

  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.4.3</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>

2.2 加入依赖

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.47</version>
    </dependency>
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.1.3</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>1.3.1</version>
    </dependency>

Mybatis接入SpringBoot项目

 <plugin>
          <groupId>org.mybatis.generator</groupId>
          <artifactId>mybatis-generator-maven-plugin</artifactId>
          <version>1.3.5</version>
          <dependencies>
            <!-- 注意这里plugin下的dependencies，Maven是无法识别的 -->
            <!-- 比较骚的操作就是，先把下面的dependency放到外面project下面的dependencies -->
            <!-- 然后去右侧工具条Maven执行Reimport，最后再把这些dependency放回来，再进行Reimport，来导入mybatis的插件 -->
            <dependency>
              <groupId>org.mybatis.generator</groupId>
              <artifactId>mybatis-generator-core</artifactId>
              <version>1.3.5</version>
            </dependency>

            <dependency>
              <groupId>mysql</groupId>
              <artifactId>mysql-connector-java</artifactId>
              <version>5.1.47</version>
            </dependency>
          </dependencies>
          <executions>
            <execution>
              <id>mybatis generator</id>
              <phase>package</phase>
              <goals>
                <goal>generate</goal>
              </goals>
            </execution>
          </executions>
          <configuration>
            <!--允许移动生成的文件-->
            <verbose>true</verbose>
            <!--允许自动覆盖文件（生产环境中千万不要这样做）-->
            <overwrite>true</overwrite>
            <configurationFile>
              src/main/resources/mybatis-generator.xml
            </configurationFile>
          </configuration>
        </plugin>

完整的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.miaoshaproject</groupId>
  <artifactId>miaosha</artifactId>
  <version>1.0-SNAPSHOT</version>

  <name>miaosha</name>
  <!-- FIXME change it to the project's website -->
  <url>http://www.example.com</url>


  <parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.4.3</version>
    <relativePath/> <!-- lookup parent from repository -->
  </parent>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
  </properties>

  <dependencies>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.47</version>
    </dependency>
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.1.3</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>1.3.1</version>
    </dependency>







    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
      <plugins>
        <!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
        <plugin>
          <artifactId>maven-clean-plugin</artifactId>
          <version>3.1.0</version>
        </plugin>
        <!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
        <plugin>
          <artifactId>maven-resources-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-compiler-plugin</artifactId>
          <version>3.8.0</version>
        </plugin>
        <plugin>
          <artifactId>maven-surefire-plugin</artifactId>
          <version>2.22.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-jar-plugin</artifactId>
          <version>3.0.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-install-plugin</artifactId>
          <version>2.5.2</version>
        </plugin>
        <plugin>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
        <!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
        <plugin>
          <artifactId>maven-site-plugin</artifactId>
          <version>3.7.1</version>
        </plugin>
        <plugin>
          <artifactId>maven-project-info-reports-plugin</artifactId>
          <version>3.0.0</version>
        </plugin>






        <plugin>
          <groupId>org.mybatis.generator</groupId>
          <artifactId>mybatis-generator-maven-plugin</artifactId>
          <version>1.3.5</version>
          <dependencies>
            <!-- 注意这里plugin下的dependencies，Maven是无法识别的 -->
            <!-- 比较骚的操作就是，先把下面的dependency放到外面project下面的dependencies -->
            <!-- 然后去右侧工具条Maven执行Reimport，最后再把这些dependency放回来，再进行Reimport，来导入mybatis的插件 -->
            <dependency>
              <groupId>org.mybatis.generator</groupId>
              <artifactId>mybatis-generator-core</artifactId>
              <version>1.3.5</version>
            </dependency>

            <dependency>
              <groupId>mysql</groupId>
              <artifactId>mysql-connector-java</artifactId>
              <version>5.1.47</version>
            </dependency>
          </dependencies>
          <executions>
            <execution>
              <id>mybatis generator</id>
              <phase>package</phase>
              <goals>
                <goal>generate</goal>
              </goals>
            </execution>
          </executions>
          <configuration>
            <!--允许移动生成的文件-->
            <verbose>true</verbose>
            <!--允许自动覆盖文件（生产环境中千万不要这样做）-->
            <overwrite>true</overwrite>
            <configurationFile>
              src/main/resources/mybatis-generator.xml
            </configurationFile>
          </configuration>
        </plugin>

      </plugins>
    </pluginManagement>
  </build>
</project>

3、application.properties和mybatis-generator.xml文件

创建application.properties文件和mybatis-generator.xml文件
application.properties

server.port=8090
mybatis.mapper-locations=classpath:mapping/*.xml


spring.datasource.name=miaosha
spring.datasource.url=jdbc:mysql://localhost:3306/miaosha
spring.datasource.username=root
spring.datasource.password=123456

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

Mybatis自动生成器的使用方式
mybatis-generator.xml

<?xml version="1.0" encoding="utf-8"?>
<!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">
        <!--数据库链接地址账号密码-->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver"
                        connectionURL="jdbc:mysql://localhost:3306/miaosha"
                        userId="root"
                        password="123456">
        </jdbcConnection>

        <!--生成DataObject类存放位置-->
        <javaModelGenerator targetPackage="com.miaoshaproject.dataobject" targetProject="src/main/java">
            <property name="enableSubPackages" value="true" />
            <property name="trimStrings" value="true" />
        </javaModelGenerator>

        <!--生成映射文件存放位置-->
        <sqlMapGenerator targetPackage="mapping"  targetProject="src/main/resources">
            <property name="enableSubPackages" value="true" />
        </sqlMapGenerator>

        <!--生成Dao类存放位置-->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.miaoshaproject.dao"  targetProject="src/main/java">
            <property name="enableSubPackages" value="true" />
        </javaClientGenerator>

        <!--生成对应表及类名-->
        <table tableName="user_info" domainObjectName="UserDO"
               enableCountByExample="false"
               enableUpdateByExample="false"
               enableDeleteByExample="false"
               enableSelectByExample="false"
               selectByExampleQueryId="false"></table>
        <table tableName="user_password" domainObjectName="userPasswordDO"
               enableCountByExample="false"
               enableUpdateByExample="false"
               enableDeleteByExample="false"
               enableSelectByExample="false"
               selectByExampleQueryId="false"></table>
        <!--  enableCountByExample="false"
               enableUpdateByExample="false"
               enableDeleteByExample="false"
               enableSelectByExample="false"
               selectByExampleQueryId="false"
               这些属性是为了使得只生成简单查询的对应文件，去掉复杂查询的生成文件，因为一般开发中不太用的到-->
       
    </context>
</generatorConfiguration>

在src目录下分别创建dao层和dataobject层，在resource目录下创建mapping目录

4、创建数据库

使用Navicat创建一个本地的miaosha的数据库，添加两张表user_info和user_password
user_info.sql

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for user_info
-- ----------------------------
DROP TABLE IF EXISTS `user_info`;
CREATE TABLE `user_info`  (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(64) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL DEFAULT '',
  `gender` tinyint(4) NOT NULL DEFAULT 0,
  `age` int(11) NOT NULL DEFAULT 0,
  `telphone` varchar(100) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL DEFAULT '',
  `register_mode` varchar(100) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL DEFAULT '',
  `third_party_id` varchar(64) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL DEFAULT '',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 2 CHARACTER SET = utf8 COLLATE = utf8_unicode_ci ROW_FORMAT = Dynamic;

SET FOREIGN_KEY_CHECKS = 1;

user_password


SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for user_password
-- ----------------------------
DROP TABLE IF EXISTS `user_password`;
CREATE TABLE `user_password`  (
  `id` int(11) NOT NULL,
  `encrpt_password` varchar(128) CHARACTER SET utf8 COLLATE utf8_unicode_ci NOT NULL DEFAULT '',
  `user_id` int(11) NOT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_unicode_ci ROW_FORMAT = Dynamic;

SET FOREIGN_KEY_CHECKS = 1;

5、生成文件

在终端运行mvn mybatis-generator:generate命令

或者创建一个mybatis-generator:generate命令

6、测试数据库

App.java

@SpringBootApplication(scanBasePackages = {"com.miaoshaproject"})
//使用@SpringbootApplication注解  可以解决根类或者配置类头上注解过多的问题，一个@SpringbootApplication相当于
//@Configuration,@EnableAutoConfiguration和 @ComponentScan 并具有他们的默认属性值
@RestController
@MapperScan("com.miaoshaproject.dao")
public class App
{
    @Autowired
    private UserDOMapper userDOMapper;
    @RequestMapping("/")
    public String home() {
        UserDO userDO = userDOMapper.selectByPrimaryKey(1);
        if (userDO == null) {
            return "用户对象不存在";
        } else {
            return userDO.getName();
        }
    }
    public static void main( String[] args )
    {
        System.out.println( "Hello World!" );
        SpringApplication.run(App.class,args);
    }
}

注意
注入UserDOMapper 使用@Autowired会出错，有两种解决方法：

UserDOMapper文件手动加上@Repository注解
@Autowired改为@Resource注解，一个是spring注解，一个是java自带的

运行
运行APP.java后在浏览器输入http://localhost:8090/

然后手动字数据库插入一条数据：

码农公寓