Java架构师-技术专家-练习手册-第01周

Java架构师-技术专家练习笔记开发工具：idea1、Idea创建project项目（前提：Java环境已经配好Maven已经安装好）1、如果是已经打开的项目：File-New-Project如果是新打开的idea：直接选CreateNewProject创建新项目2、之后选择Maven：3给项目起名字，然后点击【finish】4：创建好的新项目：2、配置文件及添加相关工程1、打开【pom.xml】文件添加打包方式：<packaging>pom</packaging>添加子工程：选中工程-右击：New-Module选择：【Next】填写名称，点击【Finish】子模块添加成功！注意：子模块默认打包方式：jar子模块的层级结构：父类的【pom.xml】中多了<modules><module>common</module></modules>类似第2步，创建【pojo】、【mapper】、【service】【api(即controller)】模块子模块间的相互引用在【pojo】子模块的【pom.xml】中添加：<dependencies><dependency><groupId></groupId><artifactId>common</artifactId><version>1.0-SNAPSHOT</version></dependency></dependencies>在【mapper】模块的【pom.xml】中添加：<dependencies><dependency><groupId></groupId><artifactId>pojo</artifactId><version>1.0-SNAPSHOT</version></dependency></dependencies>在【service】模块的【pom.xml】中添加：<dependencies><dependency><groupId></groupId><artifactId>mapper</artifactId><version>1.0-SNAPSHOT</version></dependency></dependencies>在【api】模块的【pom.xml】中添加：<dependencies><dependency><groupId></groupId><artifactId>service</artifactId><version>1.0-SNAPSHOT</version></dependency></dependencies>即：api（即controller）->service->mapper->pojo->commonMaven打包操作打开maven管理界面显示（root）的即为父项目，根节点。点击【install】进行安装。显示【BUILDSUCCESS】即为构建打包成功设置父项目pom基本配置-相关属性及jar包引用maven配置File->Settings->BuildExecutionDeployment->Maven修改maven地址：引入依赖parent<!--引入依赖parent--><parent><artifactId>spring-boot-starter-parent</artifactId><groupId>org.springframework.boot</groupId><version>2.1.6.RELEASE</version></parent>设置资源属性：properties文件编码格式File->Settings->Editor->Fileencodings-->设置编码引入依赖dependency<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId><exclusions><exclusion><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-logging</artifactId></exclusion></exclusions></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-configuration-processor</artifactId><optional>true</optional></dependency></dependencies>创建启动类在【Java】目录下-右击-【new】-创建【package】包在新建的包下：右击【new】-【JavaClass】创建java文件起名【Application】packagecom.zyx;importorg.springframework.boot.SpringApplication;importorg.springframework.boot.autoconfigure.SpringBootApplication;importorg.springframework.scheduling.annotation.EnableScheduling;importtk.mybatis.spring.annotation.MapperScan;/***@Description*@Date2023-01-06**/@SpringBootApplication@MapperScan(basePackages={"com.zyx.mapper",""})@EnableSchedulingpublicclassApplication{publicstaticvoidmain(String[]args){SpringApplication.run(Application.class,args);}}POM文件引入数据源的配置（使用hikariCP）引入mysql包<dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.28</version></dependency>引入mybatis包<dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.0.1</version></dependency>yml文件的相关配置在【api】子模块下-【src】-【Java】-【resourres】-【new】-【file】Application文件配置：#########################web访问端口号约定8088########################server:port:8088tomcat:uri-encoding:UTF-8max-http-header-size:80KB#########################配置数据源信息########################spring:datasource:#数据源的相关配置type:com.zaxxer.hikari.HikariDataSource#数据源类型HikariCPdriver-class-name:com.mysql.jdbc.Driver#mysql驱动url:jdbc:mysql://localhost:16033/zyx?characterEncoding=utf8&serverTimezone=Asia/Shanghai&zeroDateTimeBehavior=convertToNullusername:rootpassword:B@ojia56127!hikari:connection-timeout:30000#等待连接池分配连接的最大时长（毫秒），超过这个时长还没可用的连接，则发生SQLException,默认30秒minimum-idle:5#最小连接数maximum-pool-size:20#最大连接数auto-commit:true#自动提交idle-timeout:600000#连接超时的最长时长（毫秒）超时则被释放（retired）默认：10分钟pool-name:DateSourceHikariCP#连接池名字max-lifetime:1800000#连接到生命时长（毫秒）超时而且没被使用则被释放（retired）默认：30分钟1800000msconnection-test-query:SELECT1#连接测试查询语句#######################################mybatis配置######################################mybatis:type-aliases-package:com.zyx.pojo#所有POJO类所在包路径mapper-locations:classpath:mapper/*.xml#mapper映射文件Mybatis逆向生成目录结构：pom.xml配置<dependencies><!--Mysql--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.28</version></dependency><!--mybatis--><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>2.0.1</version></dependency><!--mapper--><dependency><groupId>tk.mybatis</groupId><artifactId>mapper-spring-boot-starter</artifactId><version>4.2.2</version></dependency><dependency><groupId>tk.mybatis</groupId><artifactId>mapper</artifactId><version>4.2.0</version></dependency><dependency><groupId>org.mybatis.generator</groupId><artifactId>mybatis-generator-core</artifactId><version>1.3.7</version></dependency></dependencies>通用Mapper提供了一些通用的方法，这些通用方法是以接口的形式提供的。com.imooc.my.mapper路径下生成MyMapper接口文件：packagecom.imooc.my.mapper;importmon.Mapper;importmon.MySqlMapper;publicinterfaceMyMapper<T>extendsMapper<T>,MySqlMapper<T>{}注意：mymapper文件，不能被Application扫描到generatorConfig.xml文件例子：<?xmlversion="1.0"encoding="UTF-8"?><!DOCTYPEgeneratorConfigurationPUBLIC"-////DTDMyBatisGeneratorConfiguration1.0//EN""/dtd/mybatis-generator-config_1_0.dtd"><generatorConfiguration><contextid="MysqlContest"targetRuntime="MyBatis3Simple"defaultModelType="flat"><propertyname="javaFileEncoding"value="UTF-8"/><propertyname="beginningDelimiter"value="`"/><propertyname="endingDelimiter"value="`"/><!--通用mapper所在目录自己创建的MyMapper文件路径：com.zyx.mapper--><plugintype="tk.mybatis.mapper.generator.MapperPlugin"><propertyname="mappers"value="com.imooc.my.mapper.MyMapper"/></plugin><!--添加：useSSL=false解决：com.mysql.jdbc.exceptions.jdbc4.CommunicationsException:通信链路故障--><jdbcConnectiondriverClass="com.mysql.cj.jdbc.Driver"connectionURL="jdbc:mysql://localhost:16033/zyx-dev?useUnicode=true&characterEncoding=utf-8&autoReconnect=true&useSSL=false"userId="root"password="B@ojia56127!"></jdbcConnection><!--对应生成的pojo所在包--><javaModelGeneratortargetPackage="com.imooc.pojo"targetProject="src/main/java"></javaModelGenerator><!--对应生成mapper所在目录--><sqlMapGeneratortargetPackage="mapper"targetProject="src/main/resources"></sqlMapGenerator><!--配置mapper对应的Java映射--><javaClientGeneratortargetPackage="com.imooc.mapper"targetProject="src/main/java"type="XMLMAPPER"></javaClientGenerator><!--修改表名:tableName/指定数据库下的表名:catalog="zyx-dev"(zyx-dev数据库)--><tablecatalog="zyx-dev"tableName="users"></table></context></generatorConfiguration>逆向生成的代码，代码启动package.imooc.mybatis.utils;importorg.mybatis.generator.api.MyBatisGenerator;importorg.mybatis.generator.config.Configuration;importorg.mybatis.generator.config.xml.ConfigurationParser;importernal.DefaultShellCallback;importjava.io.File;importjava.util.ArrayList;importjava.util.List;publicclassGeneratorDisplay{publicvoidgenerator()throwsException{List<String>warnings=newArrayList<>();booleanoverwrite=true;//FileconfigFile=newFile("generatorConfig.xml");ConfigurationParsercp=newConfigurationParser(warnings);Configurationconfig=cp.parseConfiguration(configFile);DefaultShellCallbackcallback=newDefaultShellCallback(overwrite);MyBatisGeneratormyBatisGenerator=newMyBatisGenerator(config,callback,warnings);myBatisGenerator.generate(null);}publicstaticvoidmain(String[]args){try{GeneratorDisplaygeneratorDisplay=newGeneratorDisplay();generatorDisplay.generator();}catch(Exceptione){e.printStackTrace();}}}Junit测试配置pom.xml配置：<!--添加junit测试包--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><!--作用域--><scope>test</scope></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><scope>test</scope></dependency>测试类：TrabsTestimportcom.zyx.Application;importorg.junit.Test;importorg.junit.runner.RunWith;importorg.springframework.boot.test.context.SpringBootTest;importorg.springframework.test.context.junit4.SpringRunner;@RunWith(SpringRunner.class)@SpringBootTest(classes=Application.class)publicclassTrabsTest{@TestpublicvoidmyTest(){System.out.println("测试类！");}}Springboot事务（Transactional）的传播PropagationREQUIRED使用当前的事务，如果当前没有事务，则自己新建一个事务，子方法是必须运行再一个事务中的；如果当前存在事务，则加入这个事务，成为一个整体。常用于：增删改。举例：领导没饭吃，我有钱，我会自己买了自己吃；领导有的吃，会分给我一起吃。SUPPORTS如果当前有事务，则使用事务；如果当前没有事务，则不使用事务。常用于查询。举例：领导没饭吃，我也没饭吃，领导有饭吃，我也有饭吃。MANDATORY该传播属性强制必须存在一个事务，如果不存在，则抛出异常。举例：领导必须管饭，不管饭就没饭吃，我就不乐意了，就不干了（抛出异常）REQUIRES_NEW如果当前有事务，则挂起该事务，并且自己创建一个新的事务，给自己用。如果当前没有事务，则同REQUIRED举例：领导有饭吃，我偏不要，我自己买饭吃。NOT_SUPPORTED如果当前有事务，则把事务挂起，自己不适用事务去运行数据库操作。举例：领导有饭吃，分了一点给我，但我太忙了，放一边，我不吃。NEVER如果当前有事务存在，则抛出异常。举例：领导有饭吃，我不想吃，我热爱工作。（抛出异常）NESTED如果当前有事务，则开启子事务（嵌套事务），嵌套事务是独立提交或者回滚；如果当前没有事务，则同REQUIRED但是如果主事务提交，则会携带子事务一起提交。如果主事务回滚，则子事务会一起回滚，相反，子事务异常，则父事务可以回滚或不回滚。（取决于父事务）举例：领导决策不对，领导怪罪，领导带着小弟一同受罪。小弟出了差错，领导可以推卸责任，或一起承担。注册登录流程方法：用户名是否存在自定义相应数据：IMOOCJSONResult类（common下的工具类）packagecom.imooc.utils;importcom.fasterxml.jackson.annotation.JsonIgnore;importcom.fasterxml.jackson.databind.ObjectMapper;/***@Description*@Authorzhangxin*@Date20230112**/publicclassIMOOCJSONResult{//定义jackson对象privatestaticfinalObjectMapperMAPPER=newObjectMapper();//相应业务状态privateIntegerstatus;//相应消息privateStringmsg;//相应中的数据privateObjectdata;@JsonIgnoreprivateStringok;//不使用publicIMOOCJSONResult(){}publicIMOOCJSONResult(Integerstatus,Stringmsg,Objectdata){this.status=status;this.msg=msg;this.data=data;}publicIMOOCJSONResult(Integerstatus,Stringmsg,Objectdata,Stringok){this.status=status;this.msg=msg;this.data=data;this.ok=ok;}publicIMOOCJSONResult(Objectdata){this.status=200;this.msg="OK";this.data=data;}publicstaticIMOOCJSONResultbuild(Integerstatus,Stringmsg,Objectdata){returnnewIMOOCJSONResult(status,msg,data);}publicstaticIMOOCJSONResultbuild(Integerstatus,Stringmsg,Objectdata,Stringok){returnnewIMOOCJSONResult(status,msg,data,ok);}publicstaticIMOOCJSONResultok(){returnnewIMOOCJSONResult(null);}publicstaticIMOOCJSONResulterrorMsg(Stringmsg){returnnewIMOOCJSONResult(500,msg,null);}//=====================get/set方法publicstaticObjectMappergetMAPPER(){returnMAPPER;}publicIntegergetStatus(){returnstatus;}publicvoidsetStatus(Integerstatus){this.status=status;}publicStringgetMsg(){returnmsg;}publicvoidsetMsg(Stringmsg){this.msg=msg;}publicObjectgetData(){returndata;}publicvoidsetData(Objectdata){this.data=data;}publicStringgetOk(){returnok;}publicvoidsetOk(Stringok){this.ok=ok;}}实体类：Users类（自动生成的，注意@Table(name="users")注解）packagecom.imooc.pojo;importjavax.persistence.Column;importjavax.persistence.Id;importjavax.persistence.Table;importjava.util.Date;/***表名：zyx-dev..users*表注释：用户表*/@Table(name="users")publicclassUsers{/***主键id用户id*/@IdprivateStringid;/***用户名用户名*/privateStringusername;/***密码密码*/privateStringpassword;/***昵称昵称*/privateStringnickname;/***真实姓名真实姓名*/privateStringrealname;/***头像头像*/privateStringface;/***手机号手机号*/privateStringmobile;/***邮箱地址邮箱地址*/privateStringemail;/***性别性别*/privateIntegersex;/***生日生日*/privateDatebirthday;/***创建时间创建时间*/@Column(name="created_time")privateDatecreatedTime;/***更新时间更新时间*/@Column(name="updated_time")privateDateupdatedTime;/***获取主键id用户id**@returnid-主键id用户id*/publicStringgetId(){returnid;}/***设置主键id用户id**@paramid主键id用户id*/publicvoidsetId(Stringid){this.id=id;}/***获取用户名用户名**@returnusername-用户名用户名*/publicStringgetUsername(){returnusername;}/***设置用户名用户名**@paramusername用户名用户名*/publicvoidsetUsername(Stringusername){this.username=username;}/***获取密码密码**@returnpassword-密码密码*/publicStringgetPassword(){returnpassword;}/***设置密码密码**@parampassword密码密码*/publicvoidsetPassword(Stringpassword){this.password=password;}/***获取昵称昵称**@returnnickname-昵称昵称*/publicStringgetNickname(){returnnickname;}/***设置昵称昵称**@paramnickname昵称昵称*/publicvoidsetNickname(Stringnickname){this.nickname=nickname;}/***获取真实姓名真实姓名**@returnrealname-真实姓名真实姓名*/publicStringgetRealname(){returnrealname;}/***设置真实姓名真实姓名**@paramrealname真实姓名真实姓名*/publicvoidsetRealname(Stringrealname){this.realname=realname;}/***获取头像头像**@returnface-头像头像*/publicStringgetFace(){returnface;}/***设置头像头像**@paramface头像头像*/publicvoidsetFace(Stringface){this.face=face;}/***获取手机号手机号**@returnmobile-手机号手机号*/publicStringgetMobile(){returnmobile;}/***设置手机号手机号**@parammobile手机号手机号*/publicvoidsetMobile(Stringmobile){this.mobile=mobile;}/***获取邮箱地址邮箱地址**@returnemail-邮箱地址邮箱地址*/publicStringgetEmail(){returnemail;}/***设置邮箱地址邮箱地址**@paramemail邮箱地址邮箱地址*/publicvoidsetEmail(Stringemail){this.email=email;}/***获取性别性别**@returnsex-性别性别*/publicIntegergetSex(){returnsex;}/***设置性别性别**@paramsex性别性别*/publicvoidsetSex(Integersex){this.sex=sex;}/***获取生日生日**@returnbirthday-生日生日*/publicDategetBirthday(){returnbirthday;}/***设置生日生日**@parambirthday生日生日*/publicvoidsetBirthday(Datebirthday){this.birthday=birthday;}/***获取创建时间创建时间**@returncreatedTime-创建时间创建时间*/publicDategetCreatedTime(){returncreatedTime;}/***设置创建时间创建时间**@paramcreatedTime创建时间创建时间*/publicvoidsetCreatedTime(DatecreatedTime){this.createdTime=createdTime;}/***获取更新时间更新时间**@returnupdatedTime-更新时间更新时间*/publicDategetUpdatedTime(){returnupdatedTime;}/***设置更新时间更新时间**@paramupdatedTime更新时间更新时间*/publicvoidsetUpdatedTime(DateupdatedTime){this.updatedTime=updatedTime;}}Mapper类（自动生成的）packagecom.imooc.mapper;importcom.imooc.my.mapper.MyMapper;importcom.imooc.pojo.Users;publicinterfaceUsersMapperextendsMyMapper<Users>{}Mapper对应的XML（自动生成的）<?xmlversion="1.0"encoding="UTF-8"?><!DOCTYPEmapperPUBLIC"-////DTDMapper3.0//EN""/dtd/mybatis-3-mapper.dtd"><mappernamespace="com.imooc.mapper.UsersMapper"><resultMapid="BaseResultMap"type="com.imooc.pojo.Users"><!--WARNING-@mbg.generated--><idcolumn="id"jdbcType="VARCHAR"property="id"/><resultcolumn="username"jdbcType="VARCHAR"property="username"/><resultcolumn="password"jdbcType="VARCHAR"property="password"/><resultcolumn="nickname"jdbcType="VARCHAR"property="nickname"/><resultcolumn="realname"jdbcType="VARCHAR"property="realname"/><resultcolumn="face"jdbcType="VARCHAR"property="face"/><resultcolumn="mobile"jdbcType="VARCHAR"property="mobile"/><resultcolumn="email"jdbcType="VARCHAR"property="email"/><resultcolumn="sex"jdbcType="INTEGER"property="sex"/><resultcolumn="birthday"jdbcType="DATE"property="birthday"/><resultcolumn="created_time"jdbcType="TIMESTAMP"property="createdTime"/><resultcolumn="updated_time"jdbcType="TIMESTAMP"property="updatedTime"/></resultMap></mapper>Service接口：packagecom.imooc.service;/***@Description*@Authorzhangxin*@Date20230112**/publicinterfaceUserService{/***功能描述:判断用户名是否存在**@returnvoid*@date2023/1/12*@params*/publicbooleanqueryUserNameIsExist(StringuserName);}Service实现类packagecom.imooc.service.impl;importcom.imooc.mapper.UsersMapper;importcom.imooc.pojo.Users;importcom.imooc.service.UserService;importorg.springframework.beans.factory.annotation.Autowired;importorg.springframework.stereotype.Service;importorg.springframework.transaction.annotation.Propagation;importorg.springframework.transaction.annotation.Transactional;importtk.mybatis.mapper.entity.Example;/***@Description*@Authorzhangxin*@Date20230112**/@ServicepublicclassUserServiceImplimplementsUserService{@AutowiredprivateUsersMapperusersMapper;@Transactional(propagation=Propagation.SUPPORTS)@OverridepublicbooleanqueryUserNameIsExist(StringuserName){ExampleuserExample=newExample(Users.class);Example.CriteriauserCriteria=userExample.createCriteria();userCriteria.andEqualTo("username",userName);Usersresult=usersMapper.selectOneByExample(userExample);returnresult==null?false:true;}}Api接口packagecom.imooc.controller;importcom.imooc.service.UserService;importcom.imooc.utils.IMOOCJSONResult;importmons.lang3.StringUtils;importorg.springframework.beans.factory.annotation.Autowired;importorg.springframework.web.bind.annotation.GetMapping;importorg.springframework.web.bind.annotation.RequestMapping;importorg.springframework.web.bind.annotation.RequestParam;importorg.springframework.web.bind.annotation.RestController;/***@Description*@Authorzhangxin*@Date20230112**/@RestController@RequestMapping("passport")publicclassPassportController{@AutowiredprivateUserServiceuserService;@GetMapping("/usernameIsExist")publicIMOOCJSONResultusernameIsExist(@RequestParamStringuserName){//1、判断用户名不能为空if(StringUtils.isBlank(userName)){returnIMOOCJSONResult.errorMsg("用户名不能为空!");}//2、查询用户名是否存在booleanisExist=userService.queryUserNameIsExist(userName);if(isExist){returnIMOOCJSONResult.errorMsg("查询用户名已经存在！");}returnIMOOCJSONResult.ok();}}PostMan测试：localhost:8088/passport/usernameIsExist?userName=imooc方法：添加用户公共工具：common层自定义相应数据结构IMOOCJSONResult类packagecom.imooc.utils;importcom.fasterxml.jackson.annotation.JsonIgnore;importcom.fasterxml.jackson.databind.ObjectMapper;/***@Description*@Authorzhangxin*@Date20230112**/publicclassIMOOCJSONResult{//定义jackson对象privatestaticfinalObjectMapperMAPPER=newObjectMapper();//相应业务状态privateIntegerstatus;//相应消息privateStringmsg;//相应中的数据privateObjectdata;@JsonIgnoreprivateStringok;//不使用publicIMOOCJSONResult(){}publicIMOOCJSONResult(Integerstatus,Stringmsg,Objectdata){this.status=status;this.msg=msg;this.data=data;}publicIMOOCJSONResult(Integerstatus,Stringmsg,Objectdata,Stringok){this.status=status;this.msg=msg;this.data=data;this.ok=ok;}publicIMOOCJSONResult(Objectdata){this.status=200;this.msg="OK";this.data=data;}publicstaticIMOOCJSONResultbuild(Integerstatus,Stringmsg,Objectdata){returnnewIMOOCJSONResult(status,msg,data);}publicstaticIMOOCJSONResultbuild(Integerstatus,Stringmsg,Objectdata,Stringok){returnnewIMOOCJSONResult(status,msg,data,ok);}publicstaticIMOOCJSONResultok(){returnnewIMOOCJSONResult(null);}publicstaticIMOOCJSONResulterrorMsg(Stringmsg){returnnewIMOOCJSONResult(500,msg,null);}//=====================get/set方法publicstaticObjectMappergetMAPPER(){returnMAPPER;}publicIntegergetStatus(){returnstatus;}publicvoidsetStatus(Integerstatus){this.status=status;}publicStringgetMsg(){returnmsg;}publicvoidsetMsg(Stringmsg){this.msg=msg;}publicObjectgetData(){returndata;}publicvoidsetData(Objectdata){this.data=data;}publicStringgetOk(){returnok;}publicvoidsetOk(Stringok){this.ok=ok;}}调用方法：IMOOCJSONResult.errorMsg("XXX");MD5加密类：MD5Utils类packagecom.imooc.utils;importmons.codec.binary.Base64;importjava.nio.charset.StandardCharsets;importjava.security.MessageDigest;/***@DescriptionMD5加密*@Authorzhangxin*@Date20230112**/publicclassMD5Utils{/***功能描述:对字符串进行MD5加密*@authorzhangxin*@date2023/1/12*@params*@returnjava.lang.String*/publicstaticStringgetMD5Str(StringstrValue)throwsException{MessageDigestmd5=MessageDigest.getInstance("MD5");Stringnewstr=Base64.encodeBase64String(md5.digest(strValue.getBytes(StandardCharsets.UTF_8)));returnnewstr;}publicstaticvoidmain(String[]args){try{Stringmd5=getMD5Str("aaa");System.out.println(md5);}catch(Exceptione){e.printStackTrace();}}}调用方法：MD5Utils.getMD5Str(XXX)枚举：Sex类packagecom.imooc.enums;/***@Description性别枚举*@Authorzhangxin*@Date20230113**/publicenumSex{woman(0,"女"),man(1,"男"),secret(2,"保密");publicfinalIntegertype;publicfinalStringvalue;Sex(Integertype,Stringvalue){this.type=type;this.value=value;}}调用方法：Sex.secret.type添加用户：校验的实体类：UsersBOpackagecom.imooc.pojo.bo;/***@Description接收前端传入的json*@Authorzhangxin*@Date20230112**/publicclassUsersBO{publicStringusername;privateStringpassword;privateStringconfirmPassword;publicStringgetUsername(){returnusername;}publicvoidsetUsername(Stringusername){this.username=username;}publicStringgetPassword(){returnpassword;}publicvoidsetPassword(Stringpassword){this.password=password;}publicStringgetConfirmPassword(){returnconfirmPassword;}publicvoidsetConfirmPassword(StringconfirmPassword){this.confirmPassword=confirmPassword;}}Service接口packagecom.imooc.service;importcom.imooc.pojo.Users;importcom.imooc.pojo.bo.UsersBO;/***@Description*@Authorzhangxin*@Date20230112**/publicinterfaceUserService{/***功能描述:判断用户名是否存在**@returnvoid*@date2023/1/12*@params*/publicbooleanqueryUserNameIsExist(StringuserName);/***功能描述:创建用户*@authorzhangxin*@date2023/1/12*@paramsUsersBO传入的json对象*@returncom.imooc.pojo.Users*/publicUserscreateUser(UsersBOusersBO);}Service实现类：packagecom.imooc.service.impl;importcom.imooc.enums.Sex;importcom.imooc.mapper.UsersMapper;importcom.imooc.pojo.Users;importcom.imooc.pojo.bo.UsersBO;importcom.imooc.service.UserService;importcom.imooc.utils.MD5Utils;importorg.n3r.idworker.Sid;importorg.springframework.beans.factory.annotation.Autowired;importorg.springframework.stereotype.Service;importorg.springframework.transaction.annotation.Propagation;importorg.springframework.transaction.annotation.Transactional;importtk.mybatis.mapper.entity.Example;importjava.util.Date;importjava.util.UUID;/***@Description*@Authorzhangxin*@Date20230112**/@ServicepublicclassUserServiceImplimplementsUserService{@AutowiredprivateUsersMapperusersMapper;/*@AutowiredprivateSidsid;*///创建用户，默认图片privatestaticfinalStringUSER_FACE="";@Transactional(propagation=Propagation.SUPPORTS)@OverridepublicbooleanqueryUserNameIsExist(StringuserName){ExampleuserExample=newExample(Users.class);Example.CriteriauserCriteria=userExample.createCriteria();userCriteria.andEqualTo("username",userName);Usersresult=usersMapper.selectOneByExample(userExample);returnresult==null?false:true;}@Transactional(propagation=Propagation.REQUIRED)@OverridepublicUserscreateUser(UsersBOusersBO){Sidsid=newSid();Usersuser=newUsers();//user.setId(sid.nextShort());user.setId(UUID.randomUUID().toString().replace("-",""));user.setUsername(usersBO.getUsername());try{user.setPassword(MD5Utils.getMD5Str(usersBO.getPassword()));}catch(Exceptione){e.printStackTrace();}user.setNickname(usersBO.getUsername());user.setFace(USER_FACE);