[Java知识库]电商项目第一天：项目搭建(SpringCloud)

项目结构

ChangGou-common：设置实体类和工具类
ChangGou-common-db：持久层
ChangGou-eureka：注册中心
ChangGou-service / ChangGou-service-goods：处理请求响应
ChangGou-service-api / ChangGou-service-goods-api：给上面一位提供pojo

父工程

pom.xml

<?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>org.example</groupId>
    <artifactId>ChangGou-parent</artifactId>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>ChangGou-erueka</module>
        <module>ChangGou-common</module>
        <module>ChangGou-common-db</module>
        <module>changGou-service-api</module>
        <module>ChangGou-service</module>
    </modules>

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

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.6.RELEASE</version>
    </parent>

    <packaging>pom</packaging>

    <!--    依赖包-->
    <dependencies>
        <!--        测试包-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <version>2.6.0</version>
        </dependency>

        <!--        fastjson-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.51</version>
        </dependency>

        <!--        swqgger-->
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.6.1</version>
        </dependency>

        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.6.1</version>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Greenwich.SR1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
</project>

注册中心：ChangGou-eureka

只有Eureka注册中心

pom.xml

<?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">
    <parent>
        <artifactId>ChangGou-parent</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>ChangGou-erueka</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

<!--    eureka的服务端：注册中心-->
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
    </dependencies>
</project>

工具类和实体类提供者：ChangGou-common

pom.xml

<?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">
    <parent>
        <artifactId>ChangGou-parent</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>ChangGou-common</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
<!--        web起步依赖-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

<!--        redis使用-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-redis</artifactId>
        </dependency>

<!--        erueka-client-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

<!--        openfeign-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

<!--        微信支付-->
        <dependency>
            <groupId>com.github.wxpay</groupId>
            <artifactId>wxpay-sdk</artifactId>
            <version>0.0.3</version>
        </dependency>

<!--        httpclient支持-->
        <dependency>
            <groupId>org.apache.httpcomponents</groupId>
            <artifactId>httpclient</artifactId>
        </dependency>
    </dependencies>
</project>

实体类

异常处理：BaseExceptionHandler

@ControllerAdvice 注解，全局捕获异常类，只要作用在 @RequestMapping 上，所有的异常都会捕获

package com.changgou.framework.Exception;

import com.changgou.entity.Result;
import com.changgou.entity.StatusCode;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;

@ControllerAdvice
public class BaseExceptionHandler {
    /**
     * 异常处理
     */
    @ExceptionHandler(value = Exception.class)
    public Result error(Exception e){
        e.printStackTrace();
        return new Result(false, StatusCode.ERROR,e.getMessage());
    }
}

持久层提供者：ChangGou-common-db

<?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">
    <parent>
        <artifactId>ChangGou-parent</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>ChangGou-common-db</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

<!--    依赖-->
    <dependencies>
<!--        对changgou-common的依赖-->
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>ChangGou-common</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

<!--        通用mapper起步依赖-->
        <dependency>
            <groupId>tk.mybatis</groupId>
            <artifactId>mapper-spring-boot-starter</artifactId>
            <version>2.0.4</version>
        </dependency>

<!--        MySQL数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

<!--        mybatis分页插件-->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.3</version>
        </dependency>
    </dependencies>
</project>

pojo提供者：ChangGou-service-api / ChangGou-service-goods-api

ChangGou-service-api 的 pom.xml

<?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">
    <parent>
        <artifactId>ChangGou-parent</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>changgou-service-api</artifactId>
    <packaging>pom</packaging>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <modules>
        <module>ChangGou-service-goods-api</module>
    </modules>
</project>

ChangGou-service-goods-api 的 pom.xml

<?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">
    <parent>
        <artifactId>changgou-service-api</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>ChangGou-service-goods-api</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
<!--        jpa注解-->
        <dependency>
            <groupId>javax.persistence</groupId>
            <artifactId>persistence-api</artifactId>
            <version>1.0</version>
        </dependency>
    </dependencies>

</project>

pojo

消费者 CnangGou-service / ChangGou-service-goods

CnangGou-service 的 pom.xml

<?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">
    <parent>
        <artifactId>ChangGou-parent</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>Changgou-service</artifactId>
    <packaging>pom</packaging>
    <modules>
        <module>ChangGou-service-goods</module>
    </modules>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

<!--    依赖-->
    <dependencies>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>ChangGou-common-db</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>

</project>

CnangGou-service 的 pom.xml

<?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">
    <parent>
        <artifactId>Changgou-service</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>ChangGou-service-goods</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>ChangGou-service-goods-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>
</project>

application.yml

server:
  port: 18081
spring:
  application:
    name: goods
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://192.168.0.110:33306/changgou?useUnicode=true&characterEncoding-UTF-8&serverTimezone=UTC
    username: root
    password: 123456
eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:7001/eureka
  instance:
    prefer-ip-address: true
feign:
  hystrix:
    enabled: true

启动类：GoodsApplication

package com.changgou.goods;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import tk.mybatis.spring.annotation.MapperScan;

@SpringBootApplication
@EnableEurekaClient
@MapperScan(basePackages = {"com.changgou.goods.dao"})
public class GoodsApplication {
    public static void main(String[] args) {
        SpringApplication.run(GoodsApplication.class);
    }
}

Dao

继承了Mapper接口，就自动实现了增删改查的常用方法

package com.changgou.goods.dao;

import com.changgou.goods.pojo.Brand;
import org.springframework.stereotype.Component;
import tk.mybatis.mapper.common.Mapper;

@Component
public interface BrandMapper extends Mapper<Brand> {
}

接口：BrandService

package com.changgou.goods.service;

import com.changgou.goods.pojo.Brand;
import com.github.pagehelper.PageInfo;
import org.springframework.stereotype.Component;

import java.util.List;

public interface BrandService {
    /**
     * 查询所有品牌
     */
    List<Brand> findAll();

    /**
     * 根据id查询
     */
    Brand findById(Integer id);

    /**
     * 新增品牌
     */
    void add(Brand brand);

    /**
     * 修改品牌数据
     */
    void update(Brand brand);

    /**
     * 删除品牌
     */
    void delete(Integer id);

    /**
     * 多条件搜索品牌方法
     */
    List<Brand> findList(Brand brand);

    /**
     * 分页查询
     */
    PageInfo<Brand> findPage(int page,int size);

    /**
     * 多条件分页查询
     */
    PageInfo<Brand> findPage(Brand brand,int page,int size);
}

实现类：B