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GitHub 项目

springboot-part——springboot-integrate-07

Mybatis-plus版完整CRUD项目文档记录：
【SpringBoot3+Mybatis-plus】头条新闻项目实现CRUD登录注册

一、依赖

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><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>3.0.5</version></parent><groupId>com.wake</groupId><artifactId>springboot-integrate-07</artifactId><version>1.0-SNAPSHOT</version><properties><maven.compiler.source>17</maven.compiler.source><maven.compiler.target>17</maven.compiler.target><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><dependencies><!--  web开发的场景启动器 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!--  mybatis启动器 --><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>3.0.1</version></dependency><!-- 数据库相关配置启动器 jdbcTemplate 事务相关--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-jdbc</artifactId></dependency><!-- 测试启动器 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId></dependency><!-- AOP启动器 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-aop</artifactId></dependency><!-- druid启动器的依赖  --><dependency><groupId>com.alibaba</groupId><artifactId>druid-spring-boot-3-starter</artifactId><version>1.2.18</version></dependency><!-- 驱动类--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.28</version></dependency><!-- lombok --><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId></dependency><!-- pagehelper --><dependency><groupId>com.github.pagehelper</groupId><artifactId>pagehelper-spring-boot-starter</artifactId><version>2.1.0</version></dependency><!--   @ConfigurationProperties 注解--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-configuration-processor</artifactId></dependency></dependencies><!--    SpringBoot应用打包插件--><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

二、 配置文件

application.yml

server:servlet:context-path: /spring:datasource:# 连接池类型type: com.alibaba.druid.pool.DruidDataSource  # 使用Druid连接池# Druid的其他属性配置 springboot3整合情况下,数据库连接信息必须在Druid属性下!druid:url: jdbc:mysql://localhost:3306/db01_mybatisusername: rootpassword: rootdriver-class-name: com.mysql.cj.jdbc.Driver# 初始化时建立物理连接的个数initial-size: 5# 连接池的最小空闲数量min-idle: 5# 连接池最大连接数量max-active: 20# 获取连接时最大等待时间，单位毫秒max-wait: 60000# 申请连接的时候检测，如果空闲时间大于timeBetweenEvictionRunsMillis，执行validationQuery检测连接是否有效。test-while-idle: true# 既作为检测的间隔时间又作为testWhileIdel执行的依据time-between-eviction-runs-millis: 60000# 销毁线程时检测当前连接的最后活动时间和当前时间差大于该值时，关闭当前连接(配置连接在池中的最小生存时间)min-evictable-idle-time-millis: 30000# 用来检测数据库连接是否有效的sql 必须是一个查询语句(oracle中为 select 1 from dual)validation-query: select 1# 申请连接时会执行validationQuery检测连接是否有效,开启会降低性能,默认为truetest-on-borrow: false# 归还连接时会执行validationQuery检测连接是否有效,开启会降低性能,默认为truetest-on-return: false# 是否缓存preparedStatement, 也就是PSCache,PSCache对支持游标的数据库性能提升巨大，比如说oracle,在mysql下建议关闭。pool-prepared-statements: false# 要启用PSCache，必须配置大于0，当大于0时，poolPreparedStatements自动触发修改为true。在Druid中，不会存在Oracle下PSCache占用内存过多的问题，可以把这个数值配置大一些，比如说100max-pool-prepared-statement-per-connection-size: -1# 合并多个DruidDataSource的监控数据use-global-data-source-stat: truemybatis:configuration:  # setting配置auto-mapping-behavior: full # 开启resultMap自动映射 设置映射等级full 复杂情况也能映射 多表联查相关map-underscore-to-camel-case: true # true开启属性字段驼峰命名自动映射，将xxx_xxx这样的列名自动映射到xxXxx这样驼峰式命名的属性名log-impl: org.apache.ibatis.logging.slf4j.Slf4jImpltype-aliases-package: com.wake.pojo # 配置别名 批量将包下的类，设置别名都为首字母小写mapper-locations: classpath:/mappers/*.xml # mapperxml位置 

三、启动类

/*** @Mapper接口：* 表示当前接口为mybatis中的Mapper接口*   程序运行时会自动创建接口的实现类对象(代理对象)，并交给Spring的IOC容器管理*   @MapperScan("com.wake.mapper") 直接全扫描，不用单个添加*/
@MapperScan("com.wake.mapper")
@SpringBootApplication
public class Main {public static void main(String[] args) {SpringApplication.run(Main.class,args);}
}

四、SpringBoot3兼容Druid报错

META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports

com.alibaba.druid.spring.boot3.autoconfigure.DruidDataSourceAutoConfigure

五、工具类

5.1 结果封装类

package com.wake.utils;/*** 全局统一返回结果类*/
public class Result<T> {// 返回码private Integer code;// 返回消息private String message;// 返回数据private T data;public Result(){}// 返回数据protected static <T> Result<T> build(T data) {Result<T> result = new Result<T>();if (data != null)result.setData(data);return result;}public static <T> Result<T> build(T body, Integer code, String message) {Result<T> result = build(body);result.setCode(code);result.setMessage(message);return result;}public static <T> Result<T> build(T body, ResultCodeEnum resultCodeEnum) {Result<T> result = build(body);result.setCode(resultCodeEnum.getCode());result.setMessage(resultCodeEnum.getMessage());return result;}/*** 操作成功* @param data  baseCategory1List* @param <T>* @return*/public static<T> Result<T> ok(T data){Result<T> result = build(data);return build(data, ResultCodeEnum.SUCCESS);}public Result<T> message(String msg){this.setMessage(msg);return this;}public Result<T> code(Integer code){this.setCode(code);return this;}public Integer getCode() {return code;}public void setCode(Integer code) {this.code = code;}public String getMessage() {return message;}public void setMessage(String message) {this.message = message;}public T getData() {return data;}public void setData(T data) {this.data = data;}
}

5.2 解决枚举类

package com.wake.utils;/*** 统一返回结果状态信息类*/
public enum ResultCodeEnum {SUCCESS(200, "success"),USERNAME_ERROR(501, "usernameError"),PASSWORD_ERROR(503, "passwordError"),NOTLOGIN(504, "notLogin"),USERNAME_USED(505, "userNameUsed");private Integer code;private String message;private ResultCodeEnum(Integer code, String message) {this.code = code;this.message = message;}public Integer getCode() {return code;}public String getMessage() {return message;}
}

5.3 MD5加密工具类

package com.wake.utils;import org.springframework.stereotype.Component;import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;@Component
public final class MD5Util {public static String encrypt(String strSrc) {try {char hexChars[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8','9', 'a', 'b', 'c', 'd', 'e', 'f' };byte[] bytes = strSrc.getBytes();MessageDigest md = MessageDigest.getInstance("MD5");md.update(bytes);bytes = md.digest();int j = bytes.length;char[] chars = new char[j * 2];int k = 0;for (int i = 0; i < bytes.length; i++) {byte b = bytes[i];chars[k++] = hexChars[b >>> 4 & 0xf];chars[k++] = hexChars[b & 0xf];}return new String(chars);} catch (NoSuchAlgorithmException e) {e.printStackTrace();throw new RuntimeException("MD5加密出错！！+" + e);}}
}