引入springcloud的pom配置

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.12</version>
        <relativePath/>
    </parent>

<dependencyManagement>
        <dependencies>
            <!--spring cloud-->
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <!--spring cloud alibaba-->
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>${spring-cloud-alibaba.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
</dependencyManagement>

注意：

1.引入springcloud相关的type都是pom类型的。

2.springboot与springcloud的版本匹配。

<properties>
        <spring-cloud.version>2021.0.3</spring-cloud.version>
        <spring-cloud-alibaba.version>2021.0.4.0</spring-cloud-alibaba.version>
</properties>

商场项目的模块划分

1.用户模块

2.商品模块

3.购物车模块

4.订单模块

5.支付模块

登录功能代码学习

验证前端传入接口的参数

定义登录请求DTO对象，验证每个参数功能

<dependency>
            <groupId>org.hibernate.validator</groupId>
            <artifactId>hibernate-validator</artifactId>
        </dependency>

@NotNull 

import io.swagger.annotations.ApiModelProperty;
import lombok.Data;

import javax.validation.constraints.NotNull;

@Data
@ApiModel(description = "登录表单实体")
public class LoginFormDTO {
    @ApiModelProperty(value = "用户名", required = true)
    @NotNull(message = "用户名不能为空")
    private String username;
    @NotNull(message = "密码不能为空")
    @ApiModelProperty(value = "用户名", required = true)
    private String password;
    @ApiModelProperty(value = "是否记住我", required = false)
    private Boolean rememberMe = false;
}

@Validated注解来验证 

@ApiOperation("用户登录接口")
    @PostMapping("login")
    public UserLoginVO login(@RequestBody @Validated LoginFormDTO loginFormDTO){
        return userService.login(loginFormDTO);
    }

lambdaQuery()方法根据某个字段查询DB

mybatisplus中 Service层实现了IService接口后就拥有此功能

// 2.根据用户名或手机号查询
User user = lambdaQuery().eq(User::getUsername, username).one();

定义一个枚举

注意@EnumValue注解

import com.baomidou.mybatisplus.annotation.EnumValue;
import com.hmall.common.exception.BadRequestException;
import lombok.Getter;

@Getter
public enum UserStatus {
    FROZEN(0, "禁止使用"),
    NORMAL(1, "已激活"),
    ;
    @EnumValue
    int value;
    String desc;

    UserStatus(Integer value, String desc) {
        this.value = value;
        this.desc = desc;
    }

    public static UserStatus of(int value) {
        if (value == 0) {
            return FROZEN;
        }
        if (value == 1) {
            return NORMAL;
        }
        throw new BadRequestException("账户状态错误");
    }
}

对应数据库表中设计

`status` int DEFAULT '1' COMMENT '使用状态（1正常 2冻结）',
`create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
`update_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP COMMENT '更新时间',

对应java程序的写法

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import com.hmall.user.enums.UserStatus;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;

import java.io.Serializable;
import java.time.LocalDateTime;


@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
@TableName("user")
public class User implements Serializable {

    private static final long serialVersionUID = 1L;

    /**
     * 使用状态（1正常 2冻结）
     */
    private UserStatus status;

    /**
     * 创建时间
     */
    private LocalDateTime createTime;

    private LocalDateTime updateTime;
}

枚举对象可以直接使用==来比较

        // 3.校验是否禁用
        if (user.getStatus() == UserStatus.FROZEN) {
            throw new ForbiddenException("用户被冻结");
        }