MyBatisPlus-自动生成代码

根据数据表自动生成实体类、Mapper、Service、ServiceImpl、Controller

一、依赖

1、pom.xml 导入 MyBatis Plus Generator

<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-generator</artifactId>
<version>3.3.1.tmp</version>
</dependency>

<dependency>
<groupId>org.apache.velocity</groupId>
<artifactId>velocity</artifactId>
<version>1.7</version>
</dependency>

Velocity（默认）、Freemarker、Beetl

数据库中的表

二、启动类

package com.md.mybatisplus;

import com.baomidou.mybatisplus.annotation.DbType;
import com.baomidou.mybatisplus.core.exceptions.MybatisPlusException;
import com.baomidou.mybatisplus.core.toolkit.StringUtils;
import com.baomidou.mybatisplus.generator.AutoGenerator;
import com.baomidou.mybatisplus.generator.config.DataSourceConfig;
import com.baomidou.mybatisplus.generator.config.GlobalConfig;
import com.baomidou.mybatisplus.generator.config.PackageConfig;
import com.baomidou.mybatisplus.generator.config.StrategyConfig;
import com.baomidou.mybatisplus.generator.config.rules.NamingStrategy;

import java.util.Scanner;

/**
* @author md
* @Desc
* @date 2020/10/26 22:13
*/
public class main {

/**
* <p>
* 读取控制台内容
* </p>
*/
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) {
//创建generator对象
AutoGenerator autoGenerator = new AutoGenerator();

//数据源
DataSourceConfig dataSourceConfig = new DataSourceConfig();
dataSourceConfig.setDbType(DbType.MYSQL);
dataSourceConfig.setUrl("jdbc:mysql://localhost:3306/springboot?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=UTF-8");
dataSourceConfig.setUsernam
ad8
e("root");
dataSourceConfig.setPassword("123456");
dataSourceConfig.setDriverName("com.mysql.cj.jdbc.Driver");
autoGenerator.setDataSource(dataSourceConfig);

//全局配置
GlobalConfig globalConfig = new GlobalConfig();
// 工程的绝对路径+下面的目录,根据自己的路径修改
globalConfig.setOutputDir(System.getProperty("user.dir")+"/02-auto/src/main/java");
globalConfig.setOpen(false);
globalConfig.setAuthor("md");
globalConfig.setServiceName("%sService");
autoGenerator.setGlobalConfig(globalConfig);

//包信息
PackageConfig packageConfig = new PackageConfig();
packageConfig.setParent("com.md.mybatisplus");
// 生成的module
packageConfig.setModuleName(scanner("模块名："));

packageConfig.setController("controller");
packageConfig.setService("service");
packageConfig.setServiceImpl("service.impl");
packageConfig.setMapper("mapper");
packageConfig.setEntity("entity");
autoGenerator.setPackageInfo(packageConfig);

//配置策略
StrategyConfig strategyConfig = new StrategyConfig();
// 自动添加Lombok注解
strategyConfig.setEntityLombokModel(true);
// 数据库中的下划线改驼峰
strategyConfig.setColumnNaming(NamingStrategy.underline_to_camel);
strategyConfig.setNaming(NamingStrategy.underline_to_camel);
// 可以指定表名
strategyConfig.setInclude(scanner("表名，多个英文逗号分割").split(","));
autoGenerator.setStrategy(strategyConfig);

autoGenerator.execute();
}
}

这样就基本生成，默认有很多方法，可以直接使用

三、测试

1. Application

加入mapper

package com.md.mybatisplus;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan(value = "com.md.mybatisplus.user.mapper")
public class Application {

public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}

2. 主配置文件

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/springboot?serverTimezone=Asia/Shanghai&useUnicode=true&characterEncoding=UTF-8

ad8
spring.datasource.username=root
spring.datasource.password=123456

# 专门用于打印日志
mybatis-plus.configuration.log-impl=org.apache.ibatis.logging.stdout.StdOutImpl

#thymeleaf 模版前缀,默认可以不写
spring.thymeleaf.prefix=classpath:/templates/

#thymeleaf 模版后缀,默认可以不写
spring.thymeleaf.suffix=.html

3. 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>2.3.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>

<groupId>com.md.mybatisplus</groupId>
<artifactId>02-auto</artifactId>
<version>0.0.1-SNAPSHOT</version>

<name>02-auto</name>
<description>Demo project for Spring Boot</description>

<properties>
<java.version>1.8</java.version>
</properties>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>

<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>5.1.9</scope>
</dependency>

<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.3.1.tmp</version>
</dependency>

<!--自动生成-->
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-generator</artifactId>
<version>3.3.1.tmp</version>
</depend
564
ency>
<!--自动生成的模板-->
<dependency>
<groupId>org.apache.velocity</groupId>
<artifactId>velocity</artifactId>
<version>1.7</version>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>

4. UserController

package com.md.mybatisplus.user.controller;

import com.md.mybatisplus.user.service.UserService;
import org.springframework.beans.factory.annotation
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.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.stereotype.Controller;
import org.springframework.web.servlet.ModelAndView;

/**
* <p>
*  前端控制器
* </p>
*
* @author md
* @since 2020-10-26
*/
@Controller
@RequestMapping("/user/user")
public class UserController {

@Autowired
private UserService userService;

@GetMapping("/index")
public ModelAndView index(){
ModelAndView mv = new ModelAndView();
mv.setViewName("index");
// 自动生成的方法，直接使用，查询数据库中的全部数据
mv.addObject("users",userService.list());

return mv;
}
}

5. index

templates下的index.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>

<table>
<tr th:each="user:${users}">
<td th:text="${user.id}"></td>
<td th:text="${user.name}"></td>
<td th:text="${user.age}"></td>
</tr>
</table>

</body>
</html>

此时访问页面就可以访问到数据库中的数据