maven项目spring boot启动thymeleaf模板mybatis操作mysql数据库

蔚落 2023-10-18 14:08 113阅读 0赞

1.创建maven项目：创建工程参见之前写的博客[https://blog.csdn.net/ZHANGLIZENG/article/details/80866682][https_blog.csdn.net_ZHANGLIZENG_article_details_80866682]

2.pom.xml中引入需要的依赖文件和编码设置：

<properties>
           <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
           <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
           <java.version>1.8</java.version>
      </properties>
       
      
      <parent>
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-parent</artifactId>
          <version>1.5.4.RELEASE</version>
      </parent>
        
      <dependencies>
         
         
         <dependency>   
          <groupId>org.springframework.boot</groupId>
          <artifactId>spring-boot-starter-web</artifactId>
        </dependency>  
        
        <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <scope>test</scope>
        </dependency>
      
        
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-devtools</artifactId>
             <optional>true</optional>
            <scope>true</scope>
         </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>
         
         
         <dependency>
             <groupId>com.github.pagehelper</groupId>
             <artifactId>pagehelper-spring-boot-starter</artifactId>
             <version>1.2.5</version>
         </dependency>
         
         
         <dependency>
             <groupId>com.alibaba</groupId>
             <artifactId>druid-spring-boot-starter</artifactId>
             <version>1.1.9</version>
         </dependency>
         
         
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-thymeleaf</artifactId>
         </dependency>   
    
         
         <dependency>
             <groupId>com.alibaba</groupId>
             <artifactId>fastjson</artifactId>
             <version>1.2.14</version>
         </dependency>
         
      </dependencies>

3.设置项目的包结构：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70][]

4.配置springboot默认的application.properties属性：

#配置端口号以及拦截策略
    server.port=8080
    
    #seesion 过期时间  单位 （秒）  5分钟
    server.session.timeout=300
    
    #开始配置mysql连接驱动以及数据库连接池参数
    spring.datasource.name=mysql_test
    spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
    spring.datasource.druid.filters=stat
    spring.datasource.druid.driver-class-name=com.mysql.jdbc.Driver
    spring.datasource.druid.url=jdbc:mysql://localhost:3306/stock?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true
    spring.datasource.druid.username=root
    spring.datasource.druid.password=root
    
    #这里可以不用配置，有默认参数，根据自己需求
    spring.datasource.druid.initial-size=1
    spring.datasource.druid.min-idle=1
    spring.datasource.druid.max-active=20
    spring.datasource.druid.max-wait=6000
    spring.datasource.druid.time-between-eviction-runs-millis=60000
    spring.datasource.druid.min-evictable-idle-time-millis=300000
    spring.datasource.druid.validation-query=SELECT 'x'
    spring.datasource.druid.test-while-idle=true
    spring.datasource.druid.test-on-borrow=false
    spring.datasource.druid.test-on-return=false
    spring.datasource.druid.pool-prepared-statements=false
    spring.datasource.druid.max-pool-prepared-statement-per-connection-size=20
    
    #开始配置mybatis
    mybatis.mapper-locations=classpath:mapper/*.xml
    mybatis.type-aliases-package=com.stock.entity
    
    #配置thymeleaf缓存开发期间先关闭，否则影响测试
    spring.thymeleaf.cache=false
    spring.thymeleaf.prefix=classpath:/templates/
    spring.thymeleaf.suffix=.html
    spring.thymeleaf.mode=HTML5
    spring.thymeleaf.encoding=UTF-8
    
    #禁用默认的favicon.ico图标
    spring.mvc.favicon.enabled=false

5.配置springboot启动器及扫描的包：

package com.stock;
    
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.context.annotation.ComponentScan;
    
    /**
     * @Description 程序启动类
     * @author 张立增
     * @Date 2019年1月20日 下午4:39:59
     */
    @SpringBootApplication
    @ComponentScan(basePackages ={"com.stock"})
    @MapperScan("com.stock.dao")
    public class StartApplication {
       
        public static void main( String[] args )
        {
             SpringApplication.run(StartApplication.class, args);
        }
    }

6.编写查询用户表user数据展示的前后端代码：

（1）建表语句：

CREATE TABLE `user` (
      `id` INT(11) PRIMARY KEY NOT NULL AUTO_INCREMENT,
      `name` VARCHAR(255),
      `password` VARCHAR(255)
    ) ENGINE=MYISAM DEFAULT CHARSET=utf8 COMMENT='user'

（2）controller层代码：

import java.util.List;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    import org.springframework.web.servlet.ModelAndView;
    
    import com.stock.entity.User;
    import com.stock.service.UserService;
    /**
     * @Description index的控制类
     * @Date 2019年1月20日 下午5:04:27
     */
    @RestController
    public class IndexController {
    
        @Autowired
        UserService userService;
        
        
        @RequestMapping("/index")
        public ModelAndView index() {
            System.out.println("hello world!");
            ModelAndView mv = new ModelAndView("pages/index");
            List<User> userList = userService.findUserList();
            mv.addObject("userList", userList);
            return mv;
        }

（3）service代码：

import java.util.List;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    import com.stock.dao.UserDao;
    import com.stock.entity.User;
    
    @Service
    public class UserService {
    
         @Autowired
         UserDao userDao;
               
         public List<User> findUserList() {
            return userDao.findUserList();
         }
    }

（4）dao层代码：

import java.util.List;
    
    import org.springframework.stereotype.Repository;
    
    import com.stock.entity.User;
    
    @Repository
    public interface UserDao {
    
        List<User> findUserList();  
        
        
    }

（5）实体类代码：

public class User {
    
        private Integer id;
        private String name;
        private String password;
        
        public User() {
            super();
        }
    
        public User(Integer id, String name, String password) {
            super();
            this.id = id;
            this.name = name;
            this.password = password;
        }
    
        public Integer getId() {
            return id;
        }
    
        public void setId(Integer id) {
            this.id = id;
        }
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public String getPassword() {
            return password;
        }
    
        public void setPassword(String password) {
            this.password = password;
        }
        
    
    }

（6）存放在resources下的mapper包下的操作数据库sql的xml文件：

![20190124091122149.png][]

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
    <mapper namespace="com.stock.dao.UserDao">     
    
        <select id="findUserList" resultType="com.stock.entity.User">
            select * from stock.user   
        </select> 
    </mapper>

（7）html页面对查询的用户集合进行展示：

![20190124091244448.png][]

<!DOCTYPE html>
    <html>
    <head>
    <meta charset="UTF-8"/>  
    <title>测试页面</title>
    </head>
    <body>
      <table>
        <tr>
            <th>编号</th>
            <th>姓名</th>     
            <th>密码</th>
        </tr>
        
        <tr th:each="user : ${userList}">
            <td th:text="${user.id}"></td>
            <td th:text="${user.name}"></td>
            <td th:text="${user.password}"></td>
        </tr>
    </table>
    </body>
    </html>

（8）在页面输入访问连接：127.0.0.1:8080/index,查看是否查询出结果，有结果则整套流程走通

![20190124101317296.png][]

完整项目git代码下载链接（项目down下来转成maven工程，配置数据源新建表添加数据即可使用）：[https://github.com/zhangliqingyun/stock][https_github.com_zhangliqingyun_stock]

[https_blog.csdn.net_ZHANGLIZENG_article_details_80866682]: https://blog.csdn.net/ZHANGLIZENG/article/details/80866682
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H_size_16_color_FFFFFF_t_70]: https://img-blog.csdnimg.cn/20190124090129472.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L1pIQU5HTElaRU5H,size_16,color_FFFFFF,t_70
[20190124091122149.png]: https://img-blog.csdnimg.cn/20190124091122149.png
[20190124091244448.png]: https://img-blog.csdnimg.cn/20190124091244448.png
[20190124101317296.png]: https://img-blog.csdnimg.cn/20190124101317296.png
[https_github.com_zhangliqingyun_stock]: https://github.com/zhangliqingyun/stock