Spring boot + Mybatis + Thymeleaf + Druid +mySql

Posted 2021-12-02 一点唐城

目录

​​前言​​

​​开发环境（小编使用的版本）​​

​​正题​​

​​步骤​​

---

前言

Spring boot + Mybatis + Thymeleaf + Druid +mySql

开发环境（小编使用的版本）

• • 
    
• JDK版本 ：1.8及以上 （JDK１.８）；
• 开发工具 ：Intellij IDEA （IDEA２０１８.２）；
• 服务器 ：Tomcat(务必比JDK版本高，小编不在解释（Jar包不用配置、War需要配置）) （Tomcat９） ；
• JRE包 ：Maven仓库 （Maven３.６）；
• 数据库 ：mysql（MySql５.５） ；
  • 
    

正题

Spring boot ：2.１.１RELEASE ；

Thymeleaf

Mybatis

​​阿里云​​的连接池 : Druid ；

步骤

１．创建Springboot：

２．创建项目文件结构

３.POM依赖

如果使用阿里云的连接池不选择JDBC，小编用的阿里云这里不选择

点击Finish；

注：可能Maven中无Jar包需要从仓库下载，需要耐心等待（可以去听首歌）

４.项目结构

５.POM

<?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>2.1.1.RELEASE</version>

<relativePath/> <!-- lookup parent from repository -->

</parent>

<groupId>com.spring</groupId>

<artifactId>boot</artifactId>

<version>0.0.1-SNAPSHOT</version>

<name>boot</name>

<description>Demo project for Spring Boot</description>


<properties>

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

</properties>


<dependencies>

<!-- Springboot 热部署 -->

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-devtools</artifactId>

<optional>true</optional>

</dependency>

<!-- 阿里的Druid连接池 -->

<dependency>

<groupId>com.alibaba</groupId>

<artifactId>druid-spring-boot-starter</artifactId>

<version>1.1.10</version>

</dependency>

<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.mybatis.spring.boot</groupId>

<artifactId>mybatis-spring-boot-starter</artifactId>

<version>1.3.2</version>

</dependency>


<dependency>

<groupId>mysql</groupId>

<artifactId>mysql-connector-java</artifactId>

<scope>runtime</scope>

</dependency>

<dependency>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-starter-test</artifactId>

<scope>test</scope>

</dependency>

</dependencies>


<build>

<plugins>

<plugin>

<groupId>org.springframework.boot</groupId>

<artifactId>spring-boot-maven-plugin</artifactId>

</plugin>

</plugins>

</build>


</project>

注：IDEA失效解决方法

６.小编使用的application.properties文件，项目启动识别两种格式的文件properties和yml文件：

#缓存设置为false, 修改之后马上生效

spring.thymeleaf.cache=false

spring.thymeleaf.encoding=UTF-8

#spring.thymeleaf.prefix=classpath:/templates/

#spring.thymeleaf.suffix=.html



server.port=8080

server.tomcat.uriEncoding=utf-8



spring.datasource.type=com.alibaba.druid.pool.DruidDataSource

spring.datasource.url=jdbc:mysql://localhost:3306/web?useUnicode=true&serverTimezone=GMT%2B8&characterEncoding=utf-8&allowMultiQueries=true&useSSL=false

spring.datasource.username=root

spring.datasource.password=root

spring.datasource.druid.driverClassName=com.mysql.cj.jdbc.Driver

#初始化连接

spring.datasource.initialSize=20

#最大空闲数

spring.datasource.maxActive=50

#最小空闲数

spring.datasource.minIdle=10

#获取连接等待时间

#spring.datasource.druid.max-wait=60000

#最小等待时间

#spring.datasource.minEvictableIdleTimeMillis=3600000

7.其他文件生成

User.java

package com.spring.boot.bean;



public class User {



public Integer uid;

public String uname;

public String upassword;



public Integer getUid() {

return uid;

}



public void setUid(Integer uid) {

this.uid = uid;

}



public String getUanme() {

return uname;

}



public void setUanme(String uanme) {

this.uname = uanme;

}



public String getUpassword() {

return upassword;

}



public void setUpassword(String upassword) {

this.upassword = upassword;

}



@Override

public String toString() {

return "User{" +

"uid=" + uid +

", uname=" + uname + \\ +

", upassword=" + upassword + \\ +

};

}

}

UserDao.java

注解的形式，小编感觉比XML好用

package com.spring.boot.dao;



import com.spring.boot.bean.User;

import org.apache.ibatis.annotations.Select;

import org.apache.ibatis.annotations.Update;



import java.util.List;



public interface UserDao {



@Select("select * from user")

public List<User> AllUser();



@Update("<script> " + "update user" +

"<set>"+ "<if test=uname!=null>uname=#{uname},</if>"+

"<if test=upassword!=null>upassword=#{upassword},</if>"+

"</set>"+ "where uid=#{uid}"+

" </script> ")

public int Update(User user);



}

UserService.java

package com.spring.boot.service;



import com.spring.boot.bean.User;



import java.util.List;



public interface UserService {



public List<User> AllUser();



public int Update(User user);



}

UserImpl.java

主要是注解问题Service可以命名，主要还是看自己的日常使用

package com.spring.boot.service.impl;


import com.spring.boot.bean.User;

import com.spring.boot.dao.UserDao;

import com.spring.boot.service.UserService;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;


import java.util.List;


@Service

public class UserImpl implements UserService {


@Autowired

private UserDao userDao;


@Override

public List<User> AllUser() {


return userDao.AllUser();

}


@Override

public int Update(User user) {

return userDao.Update(user);

}

}

注：userDao报红解决方法

UserController.java

package com.spring.boot.controller;


import com.spring.boot.bean.User;

import com.spring.boot.service.impl.UserImpl;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Controller;

import org.springframework.ui.Model;

import org.springframework.web.bind.annotation.RequestMapping;


@Controller

public class UserController {


@Autowired

private UserImpl userimpl;


@RequestMapping("/index")

public String index(Model model, User user){

model.addAttribute("user",userimpl.AllUser());

user.uid = 2;

user.uname = "nan";

user.upassword = "lou";

userimpl.Update(user);

System.out.println("******************"+userimpl.AllUser());

System.out.println("******************"+userimpl.Update(user));

return "index";

}


}

index.html

<!DOCTYPE html>

<html xmlns:th="http://www.thymeleaf.org">

<head>

<meta charset="UTF-8">

<title>Title</title>

</head>

<body>

Spring boot+Thymeleaf!<br>

<span th:text="${user}"></span>

</body>

</html>

8.​​界面​​显示

注：后续功能再写！

Java web项目，@Controller注解是界面、@RestController是写接口