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商品微服务搭建

商品微服务搭建

商品微服务主要是实现对商品的增删改查相关操作,以及商品相关信息的增删改查。

公共组件工程搭建

创建changgou-service-api子模块changgou-service-goods-api,并将资料\javabean\changgou-service-goods-api中的Pojo导入到工程中。

 修改父工程changgou-service-api的pom.xml,添加persistence-apichanggou-common的依赖,代码如下:

<dependencies>
    <!--通用的common-->
    <dependency>
        <groupId>com.changgou</groupId>
        <artifactId>changgou-common</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>

    <!--每个工程都有Pojo,都需要用到该包对应的注解-->
    <dependency>
        <groupId>javax.persistence</groupId>
        <artifactId>persistence-api</artifactId>
        <version>1.0</version>
        <scope>compile</scope>
    </dependency>
</dependencies>

商品微服务工程搭建

修改changgou-service的pom.xml每个微服务可能都需要访问数据库所以引入changgou-common-db的依赖,代码如下:

<!--依赖-->
<dependencies>
    <dependency>
        <groupId>com.changgou</groupId>
        <artifactId>changgou-common-db</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
</dependencies>

在changgou-service中创建changgou-service-goods ,pom.xml引入依赖

<?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>com.changgou</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>
    <artifactId>changgou-service-goods</artifactId>

    <!--依赖-->
    <dependencies>
        <dependency>
            <groupId>com.changgou</groupId>
            <artifactId>changgou-service-goods-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>
</project>
View Code

在resources下创建配置文件application.yml

server:
  port: 18081
spring:
  application:
    name: goods
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://192.168.211.132:3306/changgou_goods?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

#mybatis的配置 可以不配置  需要整合通用mapper
#mybatis:
#  configuration:
#    map-underscore-to-camel-case: true
#  mapper-locations: classpath:mapper/*Mapper.xml
#  type-aliases-package: com.changgou.goods.pojo
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在包com.changgou包下创建启动类GoodsApplication,代码如下:

package com.changgou;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@SpringBootApplication
@EnableEurekaClient
public class GoodsApplication {
    public static void main(String[] args) {
        SpringApplication.run(GoodsApplication.class, args);
    }
}

启动changgou-service-goods 再访问<http://localhost:7001/>效果如下:·

表结构分析

品牌表:tb_brand

代码实现

上面品牌表对应Brand实体类

@Table(name="tb_brand")
public class Brand implements Serializable{
    @Id
    private Integer id;//品牌id
    private String name;//品牌名称
    private String image;//品牌图片地址
    private String letter;//品牌的首字母
    private Integer seq;//排序
    
    // getter and setter  .....(省略)
}
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@Table和@Id都是JPA注解,@Table用于配置表与实体类的映射关系,@Id用于标识主键属性。

品牌列表

①Dao创建

在changgou-service-goods微服务下创建com.changgou.goods.dao.BrandMapper接口,代码如下:

public interface BrandMapper extends Mapper<Brand> {
}

继承了Mapper接口,就自动实现了增删改查的常用方法。

②业务层

创建com.changgou.goods.service.BrandService接口,代码如下:

public interface BrandService {

    /***
     * 查询所有品牌
     * @return
     */
    List<Brand> findAll();
}

创建com.changgou.goods.service.impl.BrandServiceImpl实现类,代码如下:

@Service
public class BrandServiceImpl implements BrandService {

}

③控制层

控制层 com.changgou.goods包下创建controller包 ,包下创建类

@RestController
@RequestMapping("/brand")
@CrossOrigin
public class BrandController {

}

④在启动类加入tk.mybatis.spring.annotation.MapperScan的注解扫描

//注意 要使用通用的mapper的组件扫描
@MapperScan(basePackages = {"com.changgou.goods.dao"})
// mapper接口继承了通用的mapper
//默认提供一些方法:
//   insert
//   update
//  delete
//  select

⑤增删改查相关操作接口的实现

dao层

package com.changgou.goods.dao;
import com.changgou.goods.pojo.Brand;
import org.apache.ibatis.annotations.Select;
import tk.mybatis.mapper.common.Mapper;

import java.util.List;

public interface BrandMapper extends Mapper<Brand> {

    @Select(value="select tb.* from tb_brand tb ,tb_category_brand tbc where tb.id = tbc.brand_id and tbc.category_id=#{categoryid}")
    List<Brand> findByCategory(Integer categoryid);
}
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service层

package com.changgou.goods.service;
import com.changgou.goods.pojo.Brand;
import com.github.pagehelper.PageInfo;
import java.util.List;

public interface BrandService {

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

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

    /***
     * Brand多条件搜索方法
     * @param brand
     * @return
     */
    List<Brand> findList(Brand brand);

    /***
     * 删除Brand
     * @param id
     */
    void delete(Integer id);

    /***
     * 修改Brand数据
     * @param brand
     */
    void update(Brand brand);

    /***
     * 新增Brand
     * @param brand
     */
    void add(Brand brand);

    /**
     * 根据ID查询Brand
     * @param id
     * @return
     */
     Brand findById(Integer id);

    /***
     * 查询所有Brand
     * @return
     */
    List<Brand> findAll();


    List<Brand> findByCategory(Integer id);
}
View Code

serviceImpl层

package com.changgou.goods.service.impl;
import com.changgou.goods.dao.BrandMapper;
import com.changgou.goods.pojo.Brand;
import com.changgou.goods.service.BrandService;
import com.github.pagehelper.PageHelper;
import com.github.pagehelper.PageInfo;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;
import tk.mybatis.mapper.entity.Example;
import java.util.List;

@Service
public class BrandServiceImpl implements BrandService {

    @Autowired
    private BrandMapper brandMapper;


    /**
     * Brand条件+分页查询
     * @param brand 查询条件
     * @param page 页码
     * @param size 页大小
     * @return 分页结果
     */
    @Override
    public PageInfo<Brand> findPage(Brand brand, int page, int size){
        //分页
        PageHelper.startPage(page,size);
        //搜索条件构建
        Example example = createExample(brand);
        //执行搜索
        return new PageInfo<Brand>(brandMapper.selectByExample(example));
    }

    /**
     * Brand分页查询
     * @param page
     * @param size
     * @return
     */
    @Override
    public PageInfo<Brand> findPage(int page, int size){
        //静态分页
        PageHelper.startPage(page,size);
        //分页查询
        return new PageInfo<Brand>(brandMapper.selectAll());
    }

    /**
     * Brand条件查询
     * @param brand
     * @return
     */
    @Override
    public List<Brand> findList(Brand brand){
        //构建查询条件
        Example example = createExample(brand);
        //根据构建的条件查询数据
        return brandMapper.selectByExample(example);
    }


    /**
     * Brand构建查询对象
     * @param brand
     * @return
     */
    public Example createExample(Brand brand){
        Example example=new Example(Brand.class);
        Example.Criteria criteria = example.createCriteria();
        if(brand!=null){
            // 品牌id
            if(!StringUtils.isEmpty(brand.getId())){
                    criteria.andEqualTo("id",brand.getId());
            }
            // 品牌名称
            if(!StringUtils.isEmpty(brand.getName())){
                    criteria.andLike("name","%"+brand.getName()+"%");
            }
            // 品牌图片地址
            if(!StringUtils.isEmpty(brand.getImage())){
                    criteria.andEqualTo("image",brand.getImage());
            }
            // 品牌的首字母
            if(!StringUtils.isEmpty(brand.getLetter())){
                    criteria.andEqualTo("letter",brand.getLetter());
            }
            // 排序
            if(!StringUtils.isEmpty(brand.getSeq())){
                    criteria.andEqualTo("seq",brand.getSeq());
            }
        }
        return example;
    }

    /**
     * 删除
     * @param id
     */
    @Override
    public void delete(Integer id){
        brandMapper.deleteByPrimaryKey(id);
    }

    /**
     * 修改Brand
     * @param brand
     */
    @Override
    public void update(Brand brand){
        brandMapper.updateByPrimaryKey(brand);
    }

    /**
     * 增加Brand
     * @param brand
     */
    @Override
    public void add(Brand brand){
        brandMapper.insert(brand);
    }

    /**
     * 根据ID查询Brand
     * @param id
     * @return
     */
    @Override
    public Brand findById(Integer id){
        return  brandMapper.selectByPrimaryKey(id);
    }

    /**
     * 查询Brand全部数据
     * @return
     */
    @Override
    public List<Brand> findAll() {
        return brandMapper.selectAll();
    }

    @Override
    public List<Brand> findByCategory(Integer id) {
        //两种方案:
            //1. 自己写sql语句直接执行  推荐
            //2. 调用通用的mapper的方法 一个个表查询

        return brandMapper.findByCategory(id);
    }
}
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controller层

package com.changgou.goods.controller;
import com.changgou.goods.pojo.Brand;
import com.changgou.goods.service.BrandService;
import com.github.pagehelper.PageInfo;
import entity.Result;
import entity.StatusCode;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import java.util.List;

@RestController
@RequestMapping("/brand")
@CrossOrigin
public class BrandController {

    @Autowired
    private BrandService brandService;

    /***
     * Brand分页条件搜索实现
     * @param brand
     * @param page
     * @param size
     * @return
     */
    @PostMapping(value = "/search/{page}/{size}" )
    public Result<PageInfo> findPage(@RequestBody(required = false)  Brand brand, @PathVariable  int page, @PathVariable  int size){
        //调用BrandService实现分页条件查询Brand
        PageInfo<Brand> pageInfo = brandService.findPage(brand, page, size);
        return new Result(true,StatusCode.OK,"查询成功",pageInfo);
    }

    /***
     * Brand分页搜索实现
     * @param page:当前页
     * @param size:每页显示多少条
     * @return
     */
    @GetMapping(value = "/search/{page}/{size}" )
    public Result<PageInfo> findPage(@PathVariable  int page, @PathVariable  int size){
        //调用BrandService实现分页查询Brand
        PageInfo<Brand> pageInfo = brandService.findPage(page, size);
        return new Result<PageInfo>(true,StatusCode.OK,"查询成功",pageInfo);
    }

    /***
     * 多条件搜索品牌数据
     * @param brand
     * @return
     */
    @PostMapping(value = "/search" )
    public Result<List<Brand>> findList(@RequestBody(required = false)  Brand brand){
        //调用BrandService实现条件查询Brand
        List<Brand> list = brandService.findList(brand);
        return new Result<List<Brand>>(true,StatusCode.OK,"查询成功",list);
    }

    /***
     * 根据ID删除品牌数据
     * @param id
     * @return
     */
    @DeleteMapping(value = "/{id}" )
    public Result delete(@PathVariable Integer id){
        //调用BrandService实现根据主键删除
        brandService.delete(id);
        return new Result(true,StatusCode.OK,"删除成功");
    }

    /***
     * 修改Brand数据
     * @param brand
     * @param id
     * @return
     */
    @PutMapping(value="/{id}")
    public Result update(@RequestBody  Brand brand,@PathVariable Integer id){
        //设置主键值
        brand.setId(id);
        //调用BrandService实现修改Brand
        brandService.update(brand);
        return new Result(true,StatusCode.OK,"修改成功");
    }

    /***
     * 新增Brand数据
     * @param brand
     * @return
     */
    @PostMapping
    public Result add(@RequestBody   Brand brand){
        //调用BrandService实现添加Brand
        brandService.add(brand);
        return new Result(true,StatusCode.OK,"添加成功");
    }

    /***
     * 根据ID查询Brand数据
     * @param id
     * @return
     */
    @GetMapping("/{id}")
    public Result<Brand> findById(@PathVariable Integer id){
        //调用BrandService实现根据主键查询Brand
        Brand brand = brandService.findById(id);
        return new Result<Brand>(true,StatusCode.OK,"查询成功",brand);
    }

    /***
     * 查询Brand全部数据
     * @return
     */
    @GetMapping
    public Result<List<Brand>> findAll(){
        try {
            System.out.println("aaaaa=====");
            Thread.sleep(3000);
            System.out.println("bbbb=====");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        //调用BrandService实现查询所有Brand
        List<Brand> list = brandService.findAll();
        return new Result<List<Brand>>(true, StatusCode.OK,"查询成功",list) ;
    }


    /**
     *
     * @return
     */
    @GetMapping("/category/{id}")
    public Result<List<Brand>> findBrandByCategory(@PathVariable(name="id") Integer id){
       List<Brand> brandList = brandService.findByCategory(id);

       return new Result<List<Brand>>(true,StatusCode.OK,"查询品牌列表成功",brandList);

    }
}
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⑥使用postman对接口进行测试

公共异常处理

为了使我们的代码更容易维护,我们创建一个类集中处理异常,该异常类可以创建在changgou-common工程中,创建com.changgou.framework.exception.BaseExceptionHandler,代码如下:

@ControllerAdvice
public class BaseExceptionHandler {

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

注意:@ControllerAdvice注解,全局捕获异常类,只要作用在@RequestMapping上,所有的异常都会被捕获。

可以将异常处理类BaseExceptionHandler放入公共工具类中需要注意包位置需要被微服务工程扫描到,这样全部的微服务就都会使用该异常捕获类了。

posted @ 2021-11-26 23:57  1640808365  阅读(94)  评论(0编辑  收藏  举报