瑞吉外卖项目实战Day01

瑞吉外卖项目实战

1.开发环境搭建：

1.数据库环境搭建，通过运行sql代码创建下面12张表

2.maven环境搭建

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>com.itheima</groupId>
    <artifactId>reggie_take_out</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.5</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <dependencies>

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

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

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

        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>3.4.2</version>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.20</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.76</version>
        </dependency>

        <dependency>
            <groupId>commons-lang</groupId>
            <artifactId>commons-lang</artifactId>
            <version>2.6</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.23</version>
        </dependency>

    </dependencies>


    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>
</project>

注意:使用boot框架的需要手动修改MySQL的版本

application.yml配置文件

server:
  port: 8080
spring:
  application:
    name: reggie_take_out
      
    
  datasource:
    druid:
      driver-class-name: com.mysql.cj.jdbc.Driver
      url: jdbc:mysql://localhost:3306/reggie?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&useSSL=false&allowPublicKeyRetrieval=true
      username: root
      password: "20020630"
      
      
      
mybatis-plus:
  configuration:
    #在映射实体或者属性时，将数据库中表名和字段名中的下划线去掉，按照驼峰命名法映射
    map-underscore-to-camel-case: true
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
  global-config:
    db-config:
      id-type: ASSIGN_ID

2.前端资源导入

导入完成之后进行静态资源映射(如果是直接使用springboot框架就不需要进行静态资源映射)

创建一个配置类继承 WebMvcConfigurationSupport

@Slf4j
@Configuration
public class WebMvcConfig extends WebMvcConfigurationSupport {
    

    @Override
    protected void addResourceHandlers(ResourceHandlerRegistry registry) {
    
        log.info("开启进行静态资源映射");
        registry.addResourceHandler("/backend/**").addResourceLocations("classpath:/backend/");
        registry.addResourceHandler("/front/**").addResourceLocations("classpath:/front/");

    }
}

3.登录功能实现

1.实体类的创建：

//员工实体类
@Data
public class Employee implements Serializable {
    

    private static final long serialVersionUID = 1L;

    private Long id;

    private String username;

    private String name;

    private String password;

    private String phone;

    private String sex;

    private String idNumber;//身份证

    private Integer status;

    private LocalDateTime createTime;

    private LocalDateTime updateTime;

    @TableField(fill = FieldFill.INSERT)
    private Long createUser;

    @TableField(fill = FieldFill.INSERT_UPDATE)
    private Long updateUser;

}

创建 一个返回结果类(前后端协议)

//通用的返回结果类
//服务端响应的数据最终都会封装成此对象
@Data
public class R<T> {
    

    private Integer code; //编码：1成功，0和其它数字为失败

    private String msg; //错误信息

    private T data; //数据

    private Map map = new HashMap(); //动态数据

    //登录成功
    public static <T> R <T> success(T object) {
    
        R<T> r = new R<T>();
        r.data = object;
        r.code = 1;
        return r;
    }

    public static <T> R<T> error(String msg) {
    
        R r = new R();
        r.msg = msg;
        r.code = 0;
        return r;
    }

    public R<T> add(String key, Object value) {
    
        this.map.put(key, value);
        return this;
    }

}

2.创建mapper层

创建一个接口(EmployeeMapper)继承BaseMapper

3.创建service层

创建一个接口(EmployeeService)继承IService

4.创建service的实现类（EmployeeServiceImpl）

继承ServiceImpl<EmployeeMapper, Employee>实现 EmployeeService接口

5.Cotroller层代码实现

@RestController
@RequestMapping("/employee")
public class EmployeeController {
    
    @Autowired
    private EmployeeService employeeService;

    //员工登录
    @PostMapping("/login")
    public R<Employee> login(HttpServletRequest request, @RequestBody Employee employee){
    

         //将页面提交的密码进行MD5加密处理
        String password = employee.getPassword();
        password=DigestUtils.md5DigestAsHex(password.getBytes());

        //根据用户名查询数据库
        LambdaQueryWrapper<Employee> lambdaQueryWrapper=new LambdaQueryWrapper<>();
        lambdaQueryWrapper.eq(Employee::getUsername,employee.getUsername());
        //用户名设置了唯一约束
        Employee emp = employeeService.getOne(lambdaQueryWrapper);

        //判断用户名是否存在
        if (emp==null){
    
            return R.error("登录失败");
        }
        //密码比对
        if (!emp.getPassword().equals(password)){
    
            return R.error("登录失败");
        }
        //查看账号状态是否被禁用
        if (emp.getStatus()==0){
    
            return R.error("账号已禁用");
        }
        //登录成功,将用户的id存入Session中
        HttpSession session = request.getSession();
        session.setAttribute("employee",emp.getId());

        return R.success(emp);
    }
}

4.用户退出

//用户退出
@PostMapping("/logout")
R<String> logOut(HttpServletRequest request){
    
    //清除数据
    request.getSession().removeAttribute("employee");
    return R.success("退出成功");
}

5.完善登录功能

添加拦截器（当用户没有登录不能进入首页）

@Slf4j
//检查用户是否完成登录
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    
    //路径匹配器，支持通配符
    private static final AntPathMatcher PATH_MATCHER=new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
    
        HttpServletRequest request=(HttpServletRequest)servletRequest;
        HttpServletResponse response=(HttpServletResponse) servletResponse;


        //定义不需要处理的请求路径
        String []urls=new String[]{
    
                "/employee/login",
                "employee/logout",
                "/backend/**",
                "/front/**"
        };


        //获取本次请求的uri
        String requestURI = request.getRequestURI();
        //判断此次请求是否需要处理
        log.info("拦截到路径"+requestURI);
        boolean check = check(urls, requestURI);
        if (check){
    
            //放行
            filterChain.doFilter(request, response);
            return;
        }
        //检查登录状态

        if (request.getSession().getAttribute("employee")!=null){
    
            //已经登录
            //放行
            filterChain.doFilter(request, response);
            return ;
        }
      //未登录
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));//request.js9
      return ;

    }

    //判断请求是否需要处理的方法
    public  boolean check(String[] urls,String requestURI) {
    
        for (String url : urls) {
    
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match) {
    
                return true;
            }

        }
        return false;
    }


}

注意：要想@WebFilter注解生效，需要在配置类上标注另外一个注解@ServletComponentScan用于扫描使其生效