浅尝springboot

阳光穿透心脏的1/2处 2024-04-17 18:30 30阅读 0赞

# springboot真香 #

IDEA真香，eclipse真的难用，哈哈哈

今天学了springboot；

首先说一下配置文件

1.  **pom.xml**

<dependencies>
          <dependency>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter-web</artifactId>
          </dependency>
    
          <dependency>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter-tomcat</artifactId>
              <scope>provided</scope>
          </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>mysql</groupId>
              <artifactId>mysql-connector-java</artifactId>
              <version>8.0.16</version>
          </dependency>
    
          <dependency>
              <groupId>org.mybatis</groupId>
              <artifactId>mybatis</artifactId>
              <version>3.4.6</version>
          </dependency>
    
          <dependency>
              <groupId>org.mybatis.generator</groupId>
              <artifactId>mybatis-generator-maven-plugin</artifactId>
              <version>1.3.5 </version>
          </dependency>
          <dependency>
              <groupId>org.mybatis.spring.boot</groupId>
              <artifactId>mybatis-spring-boot-starter</artifactId>
              <version>1.1.1</version>
          </dependency>
          <dependency>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter-thymeleaf</artifactId>
          </dependency>
      </dependencies>

其中有三个依赖是自带的。创建项目的时候就会自动生成。

2.配置application.properties

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
    spring.datasource.url=jdbc:mysql://localhost:3306/bookshop?characterEncoding=utf8&serverTimezone=UTC&useSSL=false
    spring.datasource.username=root
    spring.datasource.password=123456

当时配置的时候少了一个.cj 找了半天的错误

3.运行函数添加dao层的扫描。

package com.example.springbootweb;
    
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    @MapperScan("com.example.springbootweb.dao")//这个就是扫描dao层用的
    public class SpringbootWebApplication { 
    
     public static void main(String[] args) { 
         SpringApplication.run(SpringbootWebApplication.class,args);
     }
    
    }

![在这里插入图片描述][2019082921243464.png]  
这里是我的项目结构  
enitty上面是实体类的声明和一些getset方法；  
dao层放的是接口；  
controller层负责接收请求；  
html里面是界面。

html：

<!DOCTYPE html>
    <html lang="en" xmlns:th="http://www.w3.org/1999/xhtml">
    <head>
     <meta charset="UTF-8">
     <title>二手书交易平台</title>
    </head>
    <body>
    <table border="1">
     <tr>
         <td>编号</td>
         <td>书&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp名</td>
         <td>作者</td>
         <td>价格</td>
         <td>出版社</td>
         <td>种类</td>
         <td>类型</td>
     </tr>
     <tr th:each="book:${books}">
         <td th:text="${book.bookId}"></td>
         <td th:text="${book.bookName}"></td>
         <td th:text="${book.author}"></td>
         <td th:text="${book.price}"></td>
         <td th:text="${book.press}"></td>
         <td th:text="${book.kind}"></td>
         <td th:text="${book.cnt}"></td>
     </tr>
    </table>
    <form action="/showprice">
     <input type="text" name="price"/>
     <input type="submit" value="查询">
    </form>
    <form action="/add">
     书&nbsp&nbsp&nbsp名：<input type="text" name="name" /><br>
     价&nbsp&nbsp&nbsp格：<input type="text" name="price" /><br>
     作&nbsp&nbsp&nbsp者：<input type="text" name="author" /><br>
     出版社：<input type="text" name="press" /><br>
     类&nbsp&nbsp&nbsp型：<input type="text" name="kind" /><br>
     <input type="submit" value="添加" />
    </form>
    
    </body>
    </html>

controller层：

@Controller
    public class BookController { 
    
     @Autowired
     private BookDao book;
    
     @RequestMapping("showall2")
     public String showall2(ModelMap mp){ 
         List<Book> list =book.getAll();
         mp.addAttribute("books",list);
         return "showbook";
     }
    
     @RequestMapping("showprice")
     public String showprice(ModelMap mp, Float price){ 
         System.out.println(price);
         List<Book> list=book.getPriceBook(price);
         mp.addAttribute("books",list);
         return "showbook";
     }
    
     @RequestMapping("add")
     public String addBook(ModelMap mp,String name,String author,String press,String kind,Float price){ 
         book.addOneBook(name,author,press,kind,price);
         List<Book> list=book.getAll();
         mp.addAttribute("books",list);
         return "showbook";
    
     }
    }

dao层：

@Repository
    public interface BookDao { 
    
     @Select("select * from book")
     List<Book> getAll();
     @Select("select * from book where price>#{price}")
     List<Book> getPriceBook(Float price);
     @Insert("insert into book (bookName,author,price,press,kind) values(#{name},#{author},#{price},#{press},#{kind});")
     void addOneBook(@Param("name") String name, @Param("author") String author,@Param("press") String press,@Param("kind") String kind,@Param("price") Float price);
    }

完毕。

大概的思路就是：界面发来请求，controller接收到，调用dao层函数，之后再返回到界面。  
嗯，springboot真香，比ssm香多了。

[2019082921243464.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/17/fe2c7004134b4249b294ba0afebba502.png