第2讲投票系统后端架构搭建

创建项目时，随机选择一个，后面会生成配置properties文件

• 生成文件
  

maven-3.3.3

设置阿里云镜像

<?xml version="1.0" encoding="UTF-8"?><!--
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software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
under the License.
--><!--| This is the configuration file for Maven. It can be specified at two levels:||  1. User Level. This settings.xml file provides configuration for a single user,|                 and is normally provided in ${user.home}/.m2/settings.xml.||                 NOTE: This location can be overridden with the CLI option:||                 -s /path/to/user/settings.xml||  2. Global Level. This settings.xml file provides configuration for all Maven|                 users on a machine (assuming they're all using the same Maven|                 installation). It's normally provided in|                 ${maven.conf}/settings.xml.||                 NOTE: This location can be overridden with the CLI option:||                 -gs /path/to/global/settings.xml|| The sections in this sample file are intended to give you a running start at| getting the most out of your Maven installation. Where appropriate, the default| values (values used when the setting is not specified) are provided.||-->
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd"><!-- localRepository| The path to the local repository maven will use to store artifacts.|| Default: ${user.home}/.m2/repository-->
<localRepository>D:\repository</localRepository><!-- interactiveMode| This will determine whether maven prompts you when it needs input. If set to false,| maven will use a sensible default value, perhaps based on some other setting, for| the parameter in question.|| Default: true<interactiveMode>true</interactiveMode>--><!-- offline| Determines whether maven should attempt to connect to the network when executing a build.| This will have an effect on artifact downloads, artifact deployment, and others.|| Default: false<offline>false</offline>--><!-- pluginGroups| This is a list of additional group identifiers that will be searched when resolving plugins by their prefix, i.e.| when invoking a command line like "mvn prefix:goal". Maven will automatically add the group identifiers| "org.apache.maven.plugins" and "org.codehaus.mojo" if these are not already contained in the list.|--><pluginGroups><!-- pluginGroup| Specifies a further group identifier to use for plugin lookup.<pluginGroup>com.your.plugins</pluginGroup>--></pluginGroups><!-- proxies| This is a list of proxies which can be used on this machine to connect to the network.| Unless otherwise specified (by system property or command-line switch), the first proxy| specification in this list marked as active will be used.|--><proxies><!-- proxy| Specification for one proxy, to be used in connecting to the network.|<proxy><id>optional</id><active>true</active><protocol>http</protocol><username>proxyuser</username><password>proxypass</password><host>proxy.host.net</host><port>80</port><nonProxyHosts>local.net|some.host.com</nonProxyHosts></proxy>--></proxies><!-- servers| This is a list of authentication profiles, keyed by the server-id used within the system.| Authentication profiles can be used whenever maven must make a connection to a remote server.|--><servers><!-- server| Specifies the authentication information to use when connecting to a particular server, identified by| a unique name within the system (referred to by the 'id' attribute below).|| NOTE: You should either specify username/password OR privateKey/passphrase, since these pairings are|       used together.|<server><id>deploymentRepo</id><username>repouser</username><password>repopwd</password></server>--><!-- Another sample, using keys to authenticate.<server><id>siteServer</id><privateKey>/path/to/private/key</privateKey><passphrase>optional; leave empty if not used.</passphrase></server>--></servers><!-- mirrors| This is a list of mirrors to be used in downloading artifacts from remote repositories.|| It works like this: a POM may declare a repository to use in resolving certain artifacts.| However, this repository may have problems with heavy traffic at times, so people have mirrored| it to several places.|| That repository definition will have a unique id, so we can create a mirror reference for that| repository, to be used as an alternate download site. The mirror site will be the preferred| server for that repository.|--><mirrors><mirror><id>alimaven</id><name>aliyun maven</name><url>http://maven.aliyun.com/nexus/content/groups/public/</url><mirrorOf>central</mirrorOf>        </mirror></mirrors><!-- profiles| This is a list of profiles which can be activated in a variety of ways, and which can modify| the build process. Profiles provided in the settings.xml are intended to provide local machine-| specific paths and repository locations which allow the build to work in the local environment.|| For example, if you have an integration testing plugin - like cactus - that needs to know where| your Tomcat instance is installed, you can provide a variable here such that the variable is| dereferenced during the build process to configure the cactus plugin.|| As noted above, profiles can be activated in a variety of ways. One way - the activeProfiles| section of this document (settings.xml) - will be discussed later. Another way essentially| relies on the detection of a system property, either matching a particular value for the property,| or merely testing its existence. Profiles can also be activated by JDK version prefix, where a| value of '1.4' might activate a profile when the build is executed on a JDK version of '1.4.2_07'.| Finally, the list of active profiles can be specified directly from the command line.|| NOTE: For profiles defined in the settings.xml, you are restricted to specifying only artifact|       repositories, plugin repositories, and free-form properties to be used as configuration|       variables for plugins in the POM.||--><profiles><!-- profile| Specifies a set of introductions to the build process, to be activated using one or more of the| mechanisms described above. For inheritance purposes, and to activate profiles via <activatedProfiles/>| or the command line, profiles have to have an ID that is unique.|| An encouraged best practice for profile identification is to use a consistent naming convention| for profiles, such as 'env-dev', 'env-test', 'env-production', 'user-jdcasey', 'user-brett', etc.| This will make it more intuitive to understand what the set of introduced profiles is attempting| to accomplish, particularly when you only have a list of profile id's for debug.|| This profile example uses the JDK version to trigger activation, and provides a JDK-specific repo.<profile><id>jdk-1.4</id><activation><jdk>1.4</jdk></activation><repositories><repository><id>jdk14</id><name>Repository for JDK 1.4 builds</name><url>http://www.myhost.com/maven/jdk14</url><layout>default</layout><snapshotPolicy>always</snapshotPolicy></repository></repositories></profile>--><!--| Here is another profile, activated by the system property 'target-env' with a value of 'dev',| which provides a specific path to the Tomcat instance. To use this, your plugin configuration| might hypothetically look like:|| ...| <plugin>|   <groupId>org.myco.myplugins</groupId>|   <artifactId>myplugin</artifactId>||   <configuration>|     <tomcatLocation>${tomcatPath}</tomcatLocation>|   </configuration>| </plugin>| ...|| NOTE: If you just wanted to inject this configuration whenever someone set 'target-env' to|       anything, you could just leave off the <value/> inside the activation-property.|<profile><id>env-dev</id><activation><property><name>target-env</name><value>dev</value></property></activation><properties><tomcatPath>/path/to/tomcat/instance</tomcatPath></properties></profile>--></profiles><!-- activeProfiles| List of profiles that are active for all builds.|<activeProfiles><activeProfile>alwaysActiveProfile</activeProfile><activeProfile>anotherAlwaysActiveProfile</activeProfile></activeProfiles>-->
</settings>

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 https://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>2.3.2.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><groupId>com.java1234</groupId><artifactId>java1234-vote3</artifactId><version>0.0.1-SNAPSHOT</version><name>java1234-vote3</name><description>java1234-vote3</description><properties><java.version>1.8</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-validation</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-devtools</artifactId><scope>runtime</scope><optional>true</optional></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><scope>runtime</scope></dependency><!-- 连接池 --><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.1.10</version></dependency><!-- mybatis-plus --><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.3.2</version></dependency><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus-boot-starter</artifactId><version>3.3.2</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.40</version></dependency><!-- JWT --><dependency><groupId>com.auth0</groupId><artifactId>java-jwt</artifactId><version>3.2.0</version></dependency><dependency><groupId>io.jsonwebtoken</groupId><artifactId>jjwt</artifactId><version>0.9.1</version></dependency><dependency><groupId>commons-io</groupId><artifactId>commons-io</artifactId><version>2.5</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><optional>true</optional></dependency><!-- spring boot redis 缓存引入 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-redis</artifactId></dependency><!-- lettuce pool 缓存连接池 --><dependency><groupId>org.apache.commons</groupId><artifactId>commons-pool2</artifactId></dependency><!-- hutool工具类--><dependency><groupId>cn.hutool</groupId><artifactId>hutool-all</artifactId><version>5.3.3</version></dependency><!-- 验证码依赖--><dependency><groupId>com.github.axet</groupId><artifactId>kaptcha</artifactId><version>0.0.9</version></dependency><!-- 添加Httpclient支持 --><dependency><groupId>org.apache.httpcomponents</groupId><artifactId>httpclient</artifactId><version>4.5.2</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><version>2.3.2.RELEASE</version></plugin></plugins></build></project>

yml

server:port: 8866servlet:context-path: /spring:datasource:type: com.alibaba.druid.pool.DruidDataSourcedriver-class-name: com.mysql.cj.jdbc.Driverurl: jdbc:mysql://localhost:3306/db_vote3?serverTimezone=Asia/Shanghaiusername: rootpassword: 123456mybatis-plus:global-config:db-config:id-type: autoconfiguration:map-underscore-to-camel-case: trueauto-mapping-behavior: fulllog-impl: org.apache.ibatis.logging.stdout.StdOutImplmapper-locations: classpath:mapper/*.xml

t_wxuserinfo.sql

/*
SQLyog Ultimate v11.33 (64 bit)
MySQL - 5.7.18-log 
*********************************************************************
*/
/*!40101 SET NAMES utf8 */;create table `t_wxuserinfo` (`id` int (11),`openid` varchar (90),`nick_name` varchar (150),`avatar_url` varchar (600),`register_date` datetime ,`last_login_date` datetime ,`status` char (3)
); 
insert into `t_wxuserinfo` (`id`, `openid`, `nick_name`, `avatar_url`, `register_date`, `last_login_date`, `status`) values('6','o30ur5JpAsAUyGBkR0uW4IxvahR8','小锋老师@java1234','20230324082340000000882.jpeg','2023-02-27 17:48:29','2023-05-04 21:06:40','0');
insert into `t_wxuserinfo` (`id`, `openid`, `nick_name`, `avatar_url`, `register_date`, `last_login_date`, `status`) values('7','o30ur5PiPOr52bBsetXcIV93NL-U','小锋四号@java1234','20230410102248000000487.jpg','2023-04-10 10:21:30','2023-05-04 21:20:38','0');
insert into `t_wxuserinfo` (`id`, `openid`, `nick_name`, `avatar_url`, `register_date`, `last_login_date`, `status`) values('9','o30ur5JpAsAUyGBkR0uW4IxvahR0','微信用户','default.png','2023-04-30 07:42:19','2023-04-30 07:42:19','1');
insert into `t_wxuserinfo` (`id`, `openid`, `nick_name`, `avatar_url`, `register_date`, `last_login_date`, `status`) values('10','1',NULL,NULL,NULL,NULL,'1');
insert into `t_wxuserinfo` (`id`, `openid`, `nick_name`, `avatar_url`, `register_date`, `last_login_date`, `status`) values('11','2',NULL,NULL,NULL,NULL,'1');
insert into `t_wxuserinfo` (`id`, `openid`, `nick_name`, `avatar_url`, `register_date`, `last_login_date`, `status`) values('12','3',NULL,NULL,NULL,NULL,'1');
insert into `t_wxuserinfo` (`id`, `openid`, `nick_name`, `avatar_url`, `register_date`, `last_login_date`, `status`) values('13','4',NULL,NULL,NULL,NULL,'1');
insert into `t_wxuserinfo` (`id`, `openid`, `nick_name`, `avatar_url`, `register_date`, `last_login_date`, `status`) values('14','5',NULL,NULL,NULL,NULL,'1');
insert into `t_wxuserinfo` (`id`, `openid`, `nick_name`, `avatar_url`, `register_date`, `last_login_date`, `status`) values('15','6',NULL,NULL,NULL,NULL,'1');
insert into `t_wxuserinfo` (`id`, `openid`, `nick_name`, `avatar_url`, `register_date`, `last_login_date`, `status`) values('16','7',NULL,NULL,NULL,NULL,'1');
insert into `t_wxuserinfo` (`id`, `openid`, `nick_name`, `avatar_url`, `register_date`, `last_login_date`, `status`) values('17','8',NULL,NULL,NULL,NULL,'1');

WxUserInfo

package com.java1234.entity;import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableName;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import lombok.Data;import java.io.Serializable;
import java.util.Date;/*** 微信用户信息实体* @author java1234_小锋* @site www.java1234.com* @company 南通小锋网络科技有限公司* @create 2022-01-08 15:59*/
@TableName("t_wxUserInfo")
@Data
public class WxUserInfo implements Serializable {private Integer id; // 用户编号private String openid; // 用户唯一标识private String nickName="微信用户"; // 用户昵称private String avatarUrl="default.png"; // 用户头像图片的 URL@JsonSerialize(using=CustomDateTimeSerializer.class)private Date registerDate; // 注册日期@JsonSerialize(using=CustomDateTimeSerializer.class)private Date lastLoginDate; // 最后登录日期private String status; // 用户状态 状态 0 可用 1 封禁@TableField(select = false,exist = false)private String code; // 微信用户code 前端传来的}

CustomDateTimeSerializer 自定义返回JSON 数据格式中日期格式化处理

package com.java1234.entity;import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.TimeZone;/*** 自定义返回JSON 数据格式中日期格式化处理* @author java1234 小锋 老师**/
public class CustomDateTimeSerializer extends JsonSerializer<Date>{@Overridepublic void serialize(Date value, JsonGenerator gen, SerializerProvider serializers)throws IOException {SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");sdf.setTimeZone(TimeZone.getTimeZone("Asia/Shanghai"));gen.writeString(sdf.format(value));  }}

R.java返回数据的封装

package com.java1234.entity;import java.util.HashMap;
import java.util.Map;/*** 页面响应entity* @author java1234_小锋* @site www.java1234.com* @company Java知识分享网* @create 2019-08-13 上午 10:00*/
public class R extends HashMap<String, Object> {private static final long serialVersionUID = 1L;public R() {put("code", 0);}public static R error() {return error(500, "未知异常，请联系管理员");}public static R error(String msg) {return error(500, msg);}public static R error(int code, String msg) {R r = new R();r.put("code", code);r.put("msg", msg);return r;}public static R ok(String msg) {R r = new R();r.put("msg", msg);return r;}public static R ok(Map<String, Object> map) {R r = new R();r.putAll(map);return r;}public static R ok() {return new R();}public R put(String key, Object value) {super.put(key, value);return this;}
}

启动类加上，扫描mapper接口：@MapperScan(“com.java1234.mapper”)

package com.java1234;import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
@MapperScan("com.java1234.mapper")
public class Java1234Vote3Application {public static void main(String[] args) {SpringApplication.run(Java1234Vote3Application.class, args);}}

* 微信用户Mapper接口

package com.java1234.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.java1234.entity.WxUserInfo;/*** 微信用户Mapper接口*/
public interface WxUserInfoMapper extends BaseMapper<WxUserInfo> {
}

IWxUserInfoService

package com.java1234.service;import com.baomidou.mybatisplus.extension.service.IService;
import com.java1234.entity.WxUserInfo;/*** 微信用户Service接口*/
public interface IWxUserInfoService extends IService<WxUserInfo> {
}

IWxUserInfoServiceImpl

package com.java1234.service.impl;import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.java1234.entity.WxUserInfo;
import com.java1234.mapper.WxUserInfoMapper;
import com.java1234.service.IWxUserInfoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;/*** 微信用户Service实现类* @author java1234_小锋 （公众号：java1234）* @site www.java1234.vip* @company 南通小锋网络科技有限公司*/
@Service("wxUserInfoService")
public class IWxUserInfoServiceImpl extends ServiceImpl<WxUserInfoMapper, WxUserInfo> implements IWxUserInfoService {@Autowiredprivate WxUserInfoMapper wxUserInfoMapper;
}

MybatisPlusConfig 分页配置

package com.java1234.config;import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;/*** MybatisPlus配置类* @author java1234_小锋* @site www.java1234.com* @company 南通小锋网络科技有限公司* @create 2022-01-30 8:10*/
@Configuration
public class MybatisPlusConfig {@Beanpublic PaginationInterceptor paginationInterceptor(){return new PaginationInterceptor();}
}

WeixinUserController

package com.java1234.controller;import com.baomidou.mybatisplus.extension.api.R;
import com.java1234.entity.WxUserInfo;
import com.java1234.service.IWxUserInfoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;import java.util.HashMap;
import java.util.List;@RequestMapping("/user")
@RestController
public class WeixinUserController {@Autowiredprivate IWxUserInfoService wxUserInfoService;/*** 测试* @return*/@RequestMapping("/test")public R test(){List<WxUserInfo> list= wxUserInfoService.list();HashMap<String,Object> result=new HashMap<>();result.put("list",list);return R.ok(result);}
}