spring boot 3.x整合集成mybatis plus3.x，最新。
版本介绍
截至发文当天spring boot正式发行版本已经为2.3.0.RELEASE，mybatis plus版本为3.3.2，皆为最新版。
由于涉及数据库操作和简化前后端对接，本文捎带把阿里的Druid连接池和swagger2也整合集成上。但皆为简单集成，未做深入讲解。如果想理解更多，可关注作者后续博客。
Mybatis Plus唠两句
但凡想用mybatis plus都是因为它的简便快捷的开发，网上有许多集成mybatis plus2.x版本,也可以用，但是既然你都准备整合集成它了，何不用最新版的？相对于2.x多了许多新特性和便捷性！
代码
1、添加maven依赖
com.alibaba
druid-spring-boot-starter
1.1.10
mysql
mysql-connector-java
org.projectlombok
lombok
true
com.baomidou
mybatis-plus-boot-starter
3.3.2
com.baomidou
mybatis-plus-generator
3.3.2
org.freemarker
freemarker
2.3.30
io.springfox
springfox-swagger2
2.8.0
io.springfox
springfox-swagger-ui
2.8.0
com.github.xiaoymin
swagger-bootstrap-ui
1.8.5
此处或许有个小坑，就是如果你的eclipse或idea没安装lombok插件的话，实体类会报没有get、set方法的错。
2、编写yml配置文件
spring:
datasource:
# 配置这个属性的意义在于，如果存在多个数据源，监控的时候可以通过名字来区分开来。 如果没有配置，将会生成一个名字，格式是："DataSource-" + System.identityHashCode(this)
name: druidDataSource
# 连接池类型
type: com.alibaba.druid.pool.DruidDataSource
druid:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://192.168.1.205:3306/test?useUnicode=true&zeroDateTimeBehavior=convertToNull&autoReconnect=true&characterEncoding=utf-8&serverTimezone=UTC
username: root
password: admin
# 配置监控统计拦截的filters，去掉后监控界面sql无法进行统计。wall:防御sql注入 stat:监控统计
filters: stat,wall,config
# 最大连接数
max-active: 100
# 初始化大小
initial-size: 1
# 获取连接等待超时时间（毫秒）
max-wait: 60000
# 最小连接数
min-idle: 1
# 间隔多久才进行一次检测。检测需要关闭的空闲连接（毫秒）
time-between-eviction-runs-millis: 60000
# 一个连接在池中最小生存的时间（毫秒）
min-evictable-idle-time-millis: 300000
validation-query: select 'x' # 用来检测连接是否有效的sql
test-while-idle: true # 建议配置为true，不影响性能，并且保证安全性。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。 获取到了不可用的数据库连接，一般由应用处理异常。
test-on-borrow: false # 申请连接时执行validationQuery检测连接是否有效，做了这个配置会降低性能。【出于性能考虑一般生产环境不开启】
test-on-return: false # 归还连接时执行validationQuery检测连接是否有效，做了这个配置会降低性能【出于性能考虑一般生产环境不开启】
pool-prepared-statements: 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。
max-open-prepared-statements: -1 # 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100
max-pool-prepared-statement-per-connection-size: -1
# mybatis-plus
mybatis-plus:
# mapper文件所在位置，注意，如果是放在src/main/java目录下 classpath:/com/yourpackage/*/mapper/*Mapper.xml 如果是放在resource目录 classpath:/mapper/*Mapper.xml
mapper-locations: classpath:mapper/*/*Mapper.xml
# 实体所在位置
type-aliases-package: com.cuicui.demomp.*.entity
configuration:
# 使用map接收返回值时，如果值为空则填充默认值：null，注意：如果没有此配置，为空的值会被过滤不返回。
call-setters-on-nulls: true
# 开启Mybatis二级缓存，默认为 true
cache-enabled: true
# 配置返回数据库(column下划线命名&&返回java实体是驼峰命名)，自动匹配无需as（没开启这个，SQL需要写as： select user_id as userId）
map-underscore-to-camel-case: true
global-config:
db-config:
# 驼峰下划线转换
table-underline: true
# swagger开关
swagger:
enable: true
更多配置可查看官方文档，中文的哦~MyBatis Plus3.x配置
3、编写跨域、durid、mybatis plus、swagger2配置文件
3.1、跨域配置文件：
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
/**
* @Author Cuicui
* @Description 跨域、拦截器配置
* @Date 2020/3/2 16:12
* @Param
* @return
**/
@Configuration
public class CorsConfig implements WebMvcConfigurer {
@Override
public void addCorsMappings(CorsRegistry registry) {
//允许跨域访问路径
registry.addMapping("/**")
//允许跨域访问的源
.allowedOrigins("*")
//允许请求的方法
.allowedMethods("POST", "GET", "PUT", "OPTIONS", "DELETE")
//预间隔时间
.maxAge(168000)
//允许头部设置
.allowedHeaders("*")
//是否发送cookie
.allowCredentials(true);
}
}
3.2、durid-数据源属性和配置文件
- 数据源属性：
import org.springframework.boot.context.properties.ConfigurationProperties;
/**
*@Description 数据源属性,和yml中的属性一一对应 驼峰命名
*@author Cuicui
*@date 2020/6/8 15:12
*/
@ConfigurationProperties(prefix = "spring.datasource.druid")
public class DruidDataSourceProperties {
// jdbc
private String driverClassName;
private String url;
private String username;
private String password;
// jdbc connection pool
private int initialSize;
private int minIdle;
private int maxActive = 100;
private long maxWait;
private long timeBetweenEvictionRunsMillis;
private long minEvictableIdleTimeMillis;
private String validationQuery;
private boolean testWhileIdle;
private boolean testOnBorrow;
private boolean testOnReturn;
private boolean poolPreparedStatements;
private int maxPoolPreparedStatementPerConnectionSize;
// filter
private String filters;
public int getInitialSize() {
return initialSize;
}
public void setInitialSize(int initialSize) {
this.initialSize = initialSize;
}
public int getMinIdle() {
return minIdle;
}
public void setMinIdle(int minIdle) {
this.minIdle = minIdle;
}
public int getMaxActive() {
return maxActive;
}
public void setMaxActive(int maxActive) {
this.maxActive = maxActive;
}
public long getMaxWait() {
return maxWait;
}
public void setMaxWait(long maxWait) {
this.maxWait = maxWait;
}
public long getTimeBetweenEvictionRunsMillis() {
return timeBetweenEvictionRunsMillis;
}
public void setTimeBetweenEvictionRunsMillis(long timeBetweenEvictionRunsMillis) {
this.timeBetweenEvictionRunsMillis = timeBetweenEvictionRunsMillis;
}
public long getMinEvictableIdleTimeMillis() {
return minEvictableIdleTimeMillis;
}
public void setMinEvictableIdleTimeMillis(long minEvictableIdleTimeMillis) {
this.minEvictableIdleTimeMillis = minEvictableIdleTimeMillis;
}
public String getValidationQuery() {
return validationQuery;
}
public void setValidationQuery(String validationQuery) {
this.validationQuery = validationQuery;
}
public boolean isTestWhileIdle() {
return testWhileIdle;
}
public void setTestWhileIdle(boolean testWhileIdle) {
this.testWhileIdle = testWhileIdle;
}
public boolean isTestOnBorrow() {
return testOnBorrow;
}
public void setTestOnBorrow(boolean testOnBorrow) {
this.testOnBorrow = testOnBorrow;
}
public boolean isTestOnReturn() {
return testOnReturn;
}
public void setTestOnReturn(boolean testOnReturn) {
this.testOnReturn = testOnReturn;
}
public boolean isPoolPreparedStatements() {
return poolPreparedStatements;
}
public void setPoolPreparedStatements(boolean poolPreparedStatements) {
this.poolPreparedStatements = poolPreparedStatements;
}
public int getMaxPoolPreparedStatementPerConnectionSize() {
return maxPoolPreparedStatementPerConnectionSize;
}
public void setMaxPoolPreparedStatementPerConnectionSize(int maxPoolPreparedStatementPerConnectionSize) {
this.maxPoolPreparedStatementPerConnectionSize = maxPoolPreparedStatementPerConnectionSize;
}
public String getFilters() {
return filters;
}
public void setFilters(String filters) {
this.filters = filters;
}
public String getDriverClassName() {
return driverClassName;
}
public void setDriverClassName(String driverClassName) {
this.driverClassName = driverClassName;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
- 数据源配置
import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import javax.servlet.Filter;
import javax.servlet.Servlet;
import javax.sql.DataSource;
import java.sql.SQLException;
/**
*@Description Druid数据源配置
*@author Cuicui
*@date 2020/6/8 15:13
*/
@Configuration
@EnableConfigurationProperties({DruidDataSourceProperties.class})
public class DruidConfig {
@Autowired
private DruidDataSourceProperties properties;
@Bean
@ConditionalOnMissingBean
public DataSource druidDataSource() {
DruidDataSource druidDataSource = new DruidDataSource();
druidDataSource.setDriverClassName(properties.getDriverClassName());
druidDataSource.setUrl(properties.getUrl());
druidDataSource.setUsername(properties.getUsername());
druidDataSource.setPassword(properties.getPassword());
druidDataSource.setInitialSize(properties.getInitialSize());
druidDataSource.setMinIdle(properties.getMinIdle());
druidDataSource.setMaxActive(properties.getMaxActive());
druidDataSource.setMaxWait(properties.getMaxWait());
druidDataSource.setTimeBetweenEvictionRunsMillis(properties.getTimeBetweenEvictionRunsMillis());
druidDataSource.setMinEvictableIdleTimeMillis(properties.getMinEvictableIdleTimeMillis());
druidDataSource.setValidationQuery(properties.getValidationQuery());
druidDataSource.setTestWhileIdle(properties.isTestWhileIdle());
druidDataSource.setTestOnBorrow(properties.isTestOnBorrow());
druidDataSource.setTestOnReturn(properties.isTestOnReturn());
druidDataSource.setPoolPreparedStatements(properties.isPoolPreparedStatements());
druidDataSource.setMaxPoolPreparedStatementPerConnectionSize(properties.getMaxPoolPreparedStatementPerConnectionSize());
try {
druidDataSource.setFilters(properties.getFilters());
druidDataSource.init();
} catch (SQLException e) {
e.printStackTrace();
}
return druidDataSource;
}
/**
* 注册Servlet信息， 配置监控视图
*
* @return
*/
@Bean
@ConditionalOnMissingBean
public ServletRegistrationBean druidServlet() {
ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
//白名单：
servletRegistrationBean.addInitParameter("allow","127.0.0.1,139.196.87.48");
//IP黑名单 (存在共同时，deny优先于allow) : 如果满足deny的话提示:Sorry, you are not permitted to view this page.
servletRegistrationBean.addInitParameter("deny","192.168.1.119");
//登录查看信息的账号密码, 用于登录Druid监控后台
servletRegistrationBean.addInitParameter("loginUsername", "admin");
servletRegistrationBean.addInitParameter("loginPassword", "admin");
//是否能够重置数据.
servletRegistrationBean.addInitParameter("resetEnable", "true");
return servletRegistrationBean;
}
/**
* 注册Filter信息, 监控拦截器
*
* @return
*/
@Bean
@ConditionalOnMissingBean
public FilterRegistrationBean filterRegistrationBean() {
FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
filterRegistrationBean.setFilter(new WebStatFilter());
filterRegistrationBean.addUrlPatterns("/*");
filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
return filterRegistrationBean;
}
}
3.3、mybatis plus 配置
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
/**
* @author Cuicui
* @Description:
* @date 2020/6/8 10:16
*/
@Configuration
@MapperScan("com.cuicui.demomp.*.mapper")
public class MyBatisPlusConfig {
/**
*@Description 分页
*@author Cuicui
*@date 2020/6/8 10:18
*/
@Bean
public PaginationInterceptor paginationInterceptor() {
PaginationInterceptor paginationInterceptor = new PaginationInterceptor();
return paginationInterceptor;
}
}
3.4swagger2配置
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.builders.ApiInfoBuilder;
import springfox.documentation.builders.ParameterBuilder;
import springfox.documentation.builders.PathSelectors;
import springfox.documentation.builders.RequestHandlerSelectors;
import springfox.documentation.schema.ModelRef;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.service.Contact;
import springfox.documentation.service.Parameter;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
import java.util.ArrayList;
import java.util.List;
/**
* @Author Cuicui
* @Description Swagger配置
* @Date 21:49 2020/1/3
* @Param
* @return
**/
@Configuration
@EnableSwagger2
public class SwaggerConfig {
@Value("${swagger.enable}")
private boolean enable;
@Bean
public Docket createRestApi() {
return new Docket(DocumentationType.SWAGGER_2).apiInfo(apiInfo()).select()
.apis(RequestHandlerSelectors.basePackage("com.cuicui.demomp")).paths(PathSelectors.any())
.build().pathMapping("/")
.enable(enable);
}
private ApiInfo apiInfo() {
return new ApiInfoBuilder()
//页面标题
.title("接口文档")
//创建人
.contact(new Contact("Cuicui", "doc.html", ""))
//版本号
.version("1.0")
//描述
.description("API 描述")
.build();
}
}
以上，spring boot已完成整合集成mybatis plus最新版以及durid连接池、swagger2等
如果swagger2不想使用，对应的配置文件可以不用，不会影响使用。
上面代码只是集成，下面代码才是重点，一键生成代码爽翻天~~
此文件要想直接使用，需要修改几处地方，会在代码中以//*标注：
import com.baomidou.mybatisplus.core.exceptions.MybatisPlusException;
import com.baomidou.mybatisplus.core.toolkit.StringPool;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.InjectionConfig;
import com.baomidou.mybatisplus.generator.config.*;
import com.baomidou.mybatisplus.generator.config.po.TableInfo;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;
import com.baomidou.mybatisplus.generator.engine.FreemarkerTemplateEngine;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
/**
*@Description 演示例子，执行 main 方法控制台输入模块表名回车自动生成对应项目目录中
*@author Cuicui
*@date 2020/6/8 10:47
*/
public class CodeGenerator {
/**
*
* 读取控制台内容
*
*/
public static String scanner(String tip) {
Scanner scanner = new Scanner(System.in);
StringBuilder help = new StringBuilder();
help.append("请输入" + tip + "：");
System.out.println(help.toString());
if (scanner.hasNext()) {
String ipt = scanner.next();
if (StringUtils.isNotBlank(ipt)) {
return ipt;
}
}
throw new MybatisPlusException("请输入正确的" + tip + "！");
}
public static void main(String[] args) {
// 代码生成器
AutoGenerator mpg = new AutoGenerator();
// 全局配置
GlobalConfig gc = new GlobalConfig();
String projectPath = System.getProperty("user.dir");
gc.setOutputDir(projectPath + "/src/main/java");
gc.setAuthor("Cuicui");
gc.setOpen(false);
// 实体属性 Swagger2 注解
gc.setSwagger2(true);
// 不设置此参数service前加I-->IUserService，设置此参数后-->UserService
gc.setServiceName("%sService");
mpg.setGlobalConfig(gc);
// 数据源配置
DataSourceConfig dsc = new DataSourceConfig();
//* 配置数据库
dsc.setUrl("jdbc:mysql://192.168.1.205:3306/test?useUnicode=true&useSSL=false&characterEncoding=utf8&serverTimezone=UTC");
// dsc.setSchemaName("public");
dsc.setDriverName("com.mysql.cj.jdbc.Driver");
//* 配置数据库账号密码
dsc.setUsername("root");
dsc.setPassword("admin");
mpg.setDataSource(dsc);
// 包配置
PackageConfig pc = new PackageConfig();
pc.setModuleName(scanner("模块名"));
//* 配置包名
pc.setParent("com.cuicui.demomp");
mpg.setPackageInfo(pc);
// 自定义配置
InjectionConfig cfg = new InjectionConfig() {
@Override
public void initMap() {
// to do nothing
}
};
// 如果模板引擎是 freemarker,建议使用freemarker模板。
String templatePath = "/templates/mapper.xml.ftl";
// 如果模板引擎是 velocity
// String templatePath = "/templates/mapper.xml.vm";
// 自定义输出配置
List focList = new ArrayList<>();
// 自定义配置会被优先输出
focList.add(new FileOutConfig(templatePath) {
@Override
public String outputFile(TableInfo tableInfo) {
// 自定义输出文件名 ， 如果你 Entity 设置了前后缀、此处注意 xml 的名称会跟着发生变化！！
return projectPath + "/src/main/resources/mapper/" + pc.getModuleName()
+ "/" + tableInfo.getEntityName() + "Mapper" + StringPool.DOT_XML;
}
});
cfg.setFileOutConfigList(focList);
mpg.setCfg(cfg);
// 配置模板
TemplateConfig templateConfig = new TemplateConfig();
templateConfig.setXml(null);
mpg.setTemplate(templateConfig);
// 策略配置
StrategyConfig strategy = new StrategyConfig();
strategy.setNaming(NamingStrategy.underline_to_camel);
strategy.setColumnNaming(NamingStrategy.underline_to_camel);
//strategy.setSuperEntityClass("你自己的父类实体,没有就不用设置!");
strategy.setEntityLombokModel(true);
strategy.setRestControllerStyle(true);
strategy.setEntityColumnConstant(true);
// 公共父类
//strategy.setSuperControllerClass("你自己的父类控制器,没有就不用设置!");
// 写于父类中的公共字段
strategy.setSuperEntityColumns("id");
strategy.setInclude(scanner("表名，多个英文逗号分割").split(","));
strategy.setControllerMappingHyphenStyle(true);
strategy.setTablePrefix(pc.getModuleName() + "_");
mpg.setStrategy(strategy);
mpg.setTemplateEngine(new FreemarkerTemplateEngine());
mpg.execute();
}
}
ok，看看效果：
最后看看项目结构：
写的一个测试插入
