【学习笔记】SSM框架整合

一、Mybatis层

创建数据库环境

CREATE DATABASE `ssmbuild`;

USE `ssmbuild`;

DROP TABLE IF EXISTS `books`;

CREATE TABLE `books` (
`bookID` INT(10) NOT NULL AUTO_INCREMENT COMMENT '书id',
`bookName` VARCHAR(100) NOT NULL COMMENT '书名',
`bookCounts` INT(11) NOT NULL COMMENT '数量',
`detail` VARCHAR(200) NOT NULL COMMENT '描述',
KEY `bookID` (`bookID`)
) ENGINE=INNODB DEFAULT CHARSET=utf8

INSERT  INTO `books`(`bookID`,`bookName`,`bookCounts`,`detail`)VALUES
(1,'Java',1,'从入门到放弃'),
(2,'MySQL',10,'从删库到跑路'),
(3,'Linux',5,'从进门到进牢');

创建Maven项目

• 新建Maven项目，命名为ssmbuild

• 添加Web支持
  

• 更改Maven配置目录
  

• 导入依赖、资源过滤

注意：导入依赖是 mysql 8.0版本

    <!--
        导入依赖mysql驱动 数据库连接池、junit、servlet、jsp、spring、mybatis
    -->
    <dependencies>
        <!--Junit-->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
        <!--数据库驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.21</version>
        </dependency>
        <!-- 数据库连接池 -->
        <dependency>
            <groupId>com.mchange</groupId>
            <artifactId>c3p0</artifactId>
            <version>0.9.5.2</version>
        </dependency>

        <!--Servlet - JSP -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.5</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet.jsp</groupId>
            <artifactId>jsp-api</artifactId>
            <version>2.2</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <!--Mybatis-->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.5.2</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>2.0.2</version>
        </dependency>

        <!--Spring-->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.1.9.RELEASE</version>
        </dependency>
    </dependencies>



    <!--
        文件资源过滤
    -->
    <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                </includes>
                <filtering>false</filtering>
            </resource>
        </resources>
    </build>

• 确认导入依赖
  
• 添加lib依赖
  

建立基本结构和框架

mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>

</configuration>

ApplicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd">

</beans>

编写Mybatis层代码

• 数据库配置文件 database.properties

注意：mysql配置文件的driverClass路径

jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssmbuild?useUnicode=true&characterEncoding=utf8&useSSL=true&serverTimezone=UTC
jdbc.username=root
jdbc.password=root

• 连接数据库
  
• 编写com.study.pojo.Books实体类

public class Books {
    
    

    private int bookID;
    private String bookName;
    private String bookCounts;
    private String detail;
    //toString get set方法 有参无参构造器
 }

• 编写BookMapper

package com.study.dao;

import com.study.pojo.Books;
import org.apache.ibatis.annotations.Param;

import java.util.List;

public interface BookMapper {
    
    
    //添加书籍
    int addBook(Books books);
    //删除书籍
    int deleteBookById(@Param("id") int id);
    //修改书籍
    int updateBook(Books books);
    //查询一本书籍
    Books queryBook(@Param("id") int id);
    //查询所有书籍
    List<Books> queryAllBooks();
}

• 编写mybatis-config.xml配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
        PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
    <typeAliases>
        <package name="com.study.pojo"/>
    </typeAliases>
    <mappers>
        <mapper resource="com/study/dao/BookMapper.xml"/>
    </mappers>
</configuration>

• 编写BookMapper.xml文件

<?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.study.dao.BookMapper">
    <!--增加一个书籍-->
    <insert id="addBook" parameterType="Books">
    insert into ssmbuild.books(bookID,bookName,bookCounts,detail) values(#{bookID},#{bookName},#{bookCounts},#{detail})
    </insert>
    <!--删除一本书籍-->
    <delete id="deleteBookById" parameterType="int">
        delete from books where bookID=#{id}
    </delete>
    <!--更新一本书籍-->
    <update id="updateBook" parameterType="Books">
        update books set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail} where bookID=#{bookID}
    </update>

    <!--查询一本书籍-->
    <select id="queryBook" parameterType="int" resultType="Books">
        select * from books where bookID=#{id};
    </select>
    <!--查询所有书籍-->
    <select id="queryAllBooks" resultType="Books">
        select * from books
    </select>
</mapper>

• 编写Service层，通过Service层调用Dao层

BooksService接口

package com.study.service;

import com.study.pojo.Books;

import java.util.List;

//service层调用Dao层
public interface BookService {
    
    
    //添加书籍
    int addBook(Books books);
    //删除书籍
    int deleteBookById(int id);
    //修改书籍
    int updateBook(Books books);
    //查询一本书籍
    Books queryBook(int id);
    //查询所有书籍
    List<Books> queryAllBooks();

}

实现类 BookServiceImpl

package com.study.service;

import com.study.dao.BookMapper;
import com.study.pojo.Books;

import java.util.List;

public class BookServiceImpl implements BookService{
    
    
    private BookMapper bookMapper;

    public void setBookMapper(BookMapper bookMapper) {
    
    
        this.bookMapper = bookMapper;
    }

    public int addBook(Books books) {
    
    
        return bookMapper.addBook(books);
    }

    public int deleteBookById(int id) {
    
    
        return bookMapper.deleteBookById(id);
    }

    public int updateBook(Books books) {
    
    
        return bookMapper.updateBook(books);
    }

    public Books queryBook(int id) {
    
    
        return bookMapper.queryBook(id);
    }

    public List<Books> queryAllBooks() {
    
    
        return bookMapper.queryAllBooks();
    }
}

二、Spring层

注意：在注册 bean 的时候引用值 value 和 ref 不要搞混

• 整合Spring-Mybatis
  分开配置，配置Spring-dao.xml文件，导入ApplicationContext.xml文件

Spring-dao.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd">

    <!--
        整合mybatis
    -->

    <!--1. 关联数据库文件-->
    <context:property-placeholder location="classpath:database.properties"/>

    <!--2. 数据库连接池 c3p0 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>

        <!-- c3p0连接池的私有属性 -->
        <property name="maxPoolSize" value="30"/>
        <property name="minPoolSize" value="10"/>
        <!-- 关闭连接后不自动commit -->
        <property name="autoCommitOnClose" value="false"/>
        <!-- 获取连接超时时间 -->
        <property name="checkoutTimeout" value="10000"/>
        <!-- 当获取连接失败重试次数 -->
        <property name="acquireRetryAttempts" value="2"/>
    </bean>

    <!--3. 配置sqlSessionFactory对象-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--数据库连接池-->
        <property name="dataSource" ref="dataSource"/>
        <!--mybatis配置文件绑定-->
        <property name="configLocation" value="classpath:mybatis-config.xml"/>
    </bean>

    <!--4. 配置扫描dao接口包 动态实现dao注入spring容器-->
    <!--相当于注入sqlSession 和 注入接口 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--配置扫描包-->
        <property name="basePackage" value="com.study.dao"/>
     </bean>
</beans>

spring-service.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
       http://www.springframework.org/schema/beans/spring-beans.xsd
       http://www.springframework.org/schema/context
       https://www.springframework.org/schema/context/spring-context.xsd">

    <!--整合service层-->

    <!--扫描bean-->
    <context:component-scan base-package="com.study.service"/>
    <!--注入到IOC容器-->
    <bean id="BookServiceImpl" class="com.study.service.BookServiceImpl">
        <property name="bookMapper" ref="bookMapper"/>
    </bean>

    <!--配置事务管理器-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

</beans>

三、SpringMVC层

• 配置Web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:ApplicationContext.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>


    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>utf-8</param-value>
        </init-param>

    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--session过期时间-->
    <session-config>
        <session-timeout>15</session-timeout>
    </session-config>

</web-app>

• 配置Spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
   http://www.springframework.org/schema/beans/spring-beans.xsd
   http://www.springframework.org/schema/context
   http://www.springframework.org/schema/context/spring-context.xsd
   http://www.springframework.org/schema/mvc
   https://www.springframework.org/schema/mvc/spring-mvc.xsd">

    <!--配置springmvc注解驱动-->
    <mvc:annotation-driven/>
    <!--静态资源默认servlet配置-->
    <mvc:default-servlet-handler/>

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

    <!--扫描web相关的包-->
    <context:component-scan base-package="com.study.Controller"/>


</beans>

• 导入到ApplicationContext.xml文件中

 <import resource="Spring-mvc.xml"></import>

配置文件结束

查询全部书籍

• 编写Controller层

@Controller
@RequestMapping("/book")
public class BookController {
    
    

    @Autowired
    @Qualifier("BookServiceImpl")
    private BookService bookService;

    @RequestMapping("allBook")
    public String list(Model model){
    
    
        List<Books> list = bookService.queryAllBooks();
        model.addAttribute("list",list);
        return "allBook";
    }
    
}

• 编写index.jsp页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>$Title$</title>
    <style type="text/css">
      a{
     
     
        text-decoration: none;
        font-size: 18px;
      }
      h3{
     
     
        width: 140px;
        height: 30px;
        text-align: center;
        background: chartreuse;
      }
      .fun1{
     
     
        position: relative;
        left: 300px;
        top: 80px;
      }
    </style>
  </head>
  <body>
  <h3 class="fun1">
    <a href="${pageContext.request.contextPath}/book/allBook">查询全部书籍</a>
  </h3>

  </body>
</html>

• 编写allBook.jsp页面

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
    <style type="text/css">
        table{
     
     
            border-collapse: collapse;
            position: relative;
            left:300px;
            top:20px;
        }
        td,th{
     
     
            border: 1px solid chartreuse;
        }
    </style>
</head>
<body>


<table>
    <caption style="color: darkorange">书籍列表</caption>
    <tr>
        <th>书籍ID</th>
        <th>名称</th>
        <th>价格</th>
        <th>描述</th>
    </tr>

    <c:forEach var="book" items="${requestScope.get('list')}">
        <tr>
            <td>${book.getBookID()} </td>
            <td>${book.getBookName()} </td>
            <td> ${book.getBookCounts()} </td>
            <td>${book.getDetail()}</td>
        </tr>
    </c:forEach>

</table>
</body>
</html>

添加书籍

注意更新信息后 跳转到allBook页面 要使用重定向

• addBook.jsp页面上

 <a href="${pageContext.request.contextPath}/book/toAddPage"><h3>新增书籍</h3></a>

• 编写Controller层

    /**
     * 跳转新增页面
     */
    @RequestMapping("/toAddPage")
    public String toAddPage(){
    
    
        System.out.println("准备转发……");
        return "toAddPage";
    }
    /**
     * 新增书籍
     * @return
     */
    @RequestMapping("/addBook")
    public String addBook(Books books){
    
    
        System.out.println("添加过来的books =>: "+books);
        bookService.addBook(books);
        return "redirect:/book/allBook";//重定向到显示全部书籍
    }

• toAddPage.jsp页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>新增书籍</title>
</head>
<body>
    <form action="${pageContext.request.contextPath}/book/addBook" method="post">
        书籍名称：<input type="text" name="bookName"/><br/>
        书籍价格：<input type="text" name="bookCounts"/><br/>
        书籍描述：<input type="text" name="detail"/><br/>
        <input type="submit" name="确认添加"/>
    </form>

</body>
</html>

更新书籍

• allBook.jsp页面

 <a href="${pageContext.request.contextPath}/book/toUpdatePage"><h3>修改书籍</h3></a>

• 编写Controller

 /**
     * 跳转修改书籍页面
     */
    @RequestMapping("/toUpdatePage")
    public String toUpdatePage(){
    
    
        return "updateBook";
    }
    /**
     * 修改书籍
     */
    @RequestMapping("/updateBook")
    public String updateBook(Books books){
    
    
        System.out.println("更改的书籍："+books);
        bookService.updateBook(books);
        return "redirect:/book/allBook";
    }

• updateBook.jsp页面

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <form method="post" action="${pageContext.request.contextPath}/book/updateBook">
        书籍ID:<input type="text" name="bookID" /><br/>
        书名：<input type="text" name="bookName"/><br/>
        价格：<input type="text" name="bookCounts"/><br/>
        描述：<input type="text" name="detail"/><br/>
        <input type="submit" value="确认修改"/>
    </form>
</body>
</html>

删除书籍

• allBook.jsp页面

    <form action="${pageContext.request.contextPath}/book/deleteBook" method="post">
        <h3 style="font-size: 18px">输入ID删除书籍</h3><input type="text" name="bookID" size="7"/>
        <input type="submit" value="删除"/>
    </form>

• controller层

    @RequestMapping("/deleteBook")
    public String deleteBook(int bookID){
    
    
        bookService.deleteBookById(bookID);
        return "redirect:/book/allBook";
    }