SSM 整合实战—— IDEA 版

1、ssm 整合：Mybatis 层

一、MyBatis 层核心目标

搭建 MyBatis 基础环境，编写实体类、Mapper 接口、Mapper 映射文件，实现数据库底层交互，为 Spring 整合做准备。

二、IDEA 项目结构（MyBatis 层）

src/main/java └── com.example ├── pojo # 实体类 │ └── Book.java ├── mapper # Mapper接口 │ └── BookMapper.java └── service # Service层接口（后续Spring层） └── BookService.java src/main/resources ├── mapper # MyBatis映射文件 │ └── BookMapper.xml ├── mybatis-config.xml # MyBatis核心配置 └── db.properties # 数据库连接信息

三、核心代码实现

1. 数据库准备（ssm_db）

sql

CREATE DATABASE ssm_db CHARACTER SET utf8mb4; USE ssm_db; CREATE TABLE books ( id INT PRIMARY KEY AUTO_INCREMENT, bookName VARCHAR(100) NOT NULL, author VARCHAR(50) NOT NULL, price DOUBLE NOT NULL ); INSERT INTO books (bookName, author, price) VALUES ("Spring实战", "Craig Walls", 79.00), ("MyBatis从入门到精通", "刘增辉", 69.00);

2. 实体类（Book.java）

package com.example.pojo; import lombok.Data; @Data // Lombok简化代码，需安装插件 public class Book { private Integer id; private String bookName; private String author; private Double price; }

3. Mapper 接口（BookMapper.java）

package com.example.mapper; import com.example.pojo.Book; import java.util.List; public interface BookMapper { // 查询所有书籍 List<Book> queryAllBook(); // 根据ID查询 Book queryBookById(Integer id); // 添加书籍 int addBook(Book book); // 修改书籍 int updateBook(Book book); // 删除书籍 int deleteBook(Integer id); // 搜索书籍（模糊查询） List<Book> searchBook(String bookName); }

4. MyBatis 映射文件（BookMapper.xml）

xml

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "https://mybatis.org/dtd/mybatis-3-mapper.dtd"> <mapper namespace="com.example.mapper.BookMapper"> <!-- 查询所有书籍 --> <select id="queryAllBook" resultType="Book"> SELECT * FROM books </select> <!-- 根据ID查询 --> <select id="queryBookById" parameterType="int" resultType="Book"> SELECT * FROM books WHERE id = #{id} </select> <!-- 添加书籍 --> <insert id="addBook" parameterType="Book"> INSERT INTO books (bookName, author, price) VALUES (#{bookName}, #{author}, #{price}) </insert> <!-- 修改书籍 --> <update id="updateBook" parameterType="Book"> UPDATE books SET bookName = #{bookName}, author = #{author}, price = #{price} WHERE id = #{id} </update> <!-- 删除书籍 --> <delete id="deleteBook" parameterType="int"> DELETE FROM books WHERE id = #{id} </delete> <!-- 搜索书籍（模糊查询） --> <select id="searchBook" parameterType="string" resultType="Book"> SELECT * FROM books WHERE bookName LIKE CONCAT('%', #{bookName}, '%') </select> </mapper>

5. MyBatis 核心配置（mybatis-config.xml）

xml

<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "https://mybatis.org/dtd/mybatis-3-config.dtd"> <configuration> <!-- 环境配置（此处由Spring管理，此处可简化） --> <environments default="development"> <environment id="development"> <transactionManager type="JDBC"/> <dataSource type="POOLED"> <property name="driver" value="${jdbc.driver}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> </dataSource> </environment> </environments> <!-- 映射器 --> <mappers> <mapper resource="mapper/BookMapper.xml"/> </mappers> </configuration>

6. 数据库配置（db.properties）

properties

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

2、ssm 整合：Spring 层

一、Spring 层核心目标

将 MyBatis 的核心组件（SqlSessionFactory、Mapper）交给 Spring 容器管理，管理 Service 层 Bean，配置声明式事务，实现解耦与事务控制。

二、Spring 核心配置（applicationContext.xml）

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:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx https://www.springframework.org/schema/tx/spring-tx.xsd"> <!-- 1. 加载数据库配置文件 --> <context:property-placeholder location="classpath:db.properties"/> <!-- 2. 配置数据源（Druid连接池，推荐） --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"> <property name="driverClassName" value="${jdbc.driver}"/> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}"/> <property name="password" value="${jdbc.password}"/> </bean> <!-- 3. 配置SqlSessionFactory（MyBatis与Spring整合核心） --> <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 注入数据源 --> <property name="dataSource" ref="dataSource"/> <!-- 加载MyBatis核心配置 --> <property name="configLocation" value="classpath:mybatis-config.xml"/> <!-- 加载Mapper映射文件 --> <property name="mapperLocations" value="classpath:mapper/*.xml"/> <!-- 配置别名 --> <property name="typeAliasesPackage" value="com.example.pojo"/> </bean> <!-- 4. 扫描Mapper接口，自动代理并注册为Bean（替代MyBatis生成代理） --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.example.mapper"/> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> </bean> <!-- 5. 扫描Service层，自动扫描并创建Bean --> <context:component-scan base-package="com.example.service"/> <!-- 6. 配置事务管理器 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"/> </bean> <!-- 7. 开启声明式事务注解支持 --> <tx:annotation-driven transaction-manager="transactionManager"/> </beans>

三、Service 层代码实现

1. Service 接口（BookService.java）

package com.example.service; import com.example.pojo.Book; import java.util.List; public interface BookService { List<Book> queryAllBook(); Book queryBookById(Integer id); void addBook(Book book); void updateBook(Book book); void deleteBook(Integer id); List<Book> searchBook(String bookName); }

2. Service 实现类（BookServiceImpl.java）

package com.example.service.impl; import com.example.mapper.BookMapper; import com.example.pojo.Book; import com.example.service.BookService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import java.util.List; @Service("bookService") public class BookServiceImpl implements BookService { // 自动注入Mapper @Autowired private BookMapper bookMapper; @Override public List<Book> queryAllBook() { return bookMapper.queryAllBook(); } @Override public Book queryBookById(Integer id) { return bookMapper.queryBookById(id); } @Override @Transactional // 事务控制：添加操作 public void addBook(Book book) { bookMapper.addBook(book); } @Override @Transactional // 事务控制：修改操作 public void updateBook(Book book) { bookMapper.updateBook(book); } @Override @Transactional // 事务控制：删除操作 public void deleteBook(Integer id) { bookMapper.deleteBook(id); } @Override public List<Book> searchBook(String bookName) { return bookMapper.searchBook(bookName); } }

3、SSM 整合：SpringMVC 层

3.1 作用说明

SpringMVC 负责接收浏览器请求、调用 Service、跳转页面、返回数据，是整个 Web 项目的入口控制层。

3.2 配置 web.xml（核心）

路径：src/main/webapp/WEB-INF/web.xml

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"> <!-- 1. 启动 Spring 根容器 --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value> </context-param> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> <!-- 2. 解决 POST 请求中文乱码 --> <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> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!-- 3. 配置 SpringMVC 前端控制器 --> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springmvc-servlet.xml</param-value> </init-param> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>

3.3 配置 springmvc-servlet.xml

路径：src/main/resources/springmvc-servlet.xml

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 https://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context https://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd"> <!-- 1. 扫描 Controller --> <context:component-scan base-package="com.controller"/> <!-- 2. 开启 SpringMVC 注解驱动 --> <mvc:annotation-driven/> <!-- 3. 静态资源放行（css/js/img） --> <mvc:default-servlet-handler/> <!-- 4. 视图解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/pages/"/> <property name="suffix" value=".jsp"/> </bean> </beans>

4、SSM 整合：查询所有书籍功能

4.1 编写 Controller

路径：com.controller.BookController.java

package com.controller; import com.pojo.Book; import com.service.BookService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import java.util.List; @Controller @RequestMapping("/book") public class BookController { @Autowired private BookService bookService; // 查询所有书籍 @RequestMapping("/allBook") public String list(Model model) { List<Book> bookList = bookService.queryAllBook(); model.addAttribute("bookList", bookList); return "bookList"; } }

4.2 编写书籍列表页面

路径：src/main/webapp/WEB-INF/pages/bookList.jsp

jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <html> <head> <title>书籍列表</title> </head> <body> <h1>书籍信息</h1> <a href="${pageContext.request.contextPath}/book/toAdd">添加书籍</a> <table border="1"> <tr> <th>书籍ID</th> <th>书籍名称</th> <th>书籍数量</th> <th>书籍详情</th> <th>操作</th> </tr> <c:forEach var="book" items="${bookList}"> <tr> <td>${book.bookID}</td> <td>${book.bookName}</td> <td>${book.bookCounts}</td> <td>${book.detail}</td> <td> <a href="${pageContext.request.contextPath}/book/toUpdate?id=${book.bookID}">修改</a> &nbsp;|&nbsp; <a href="${pageContext.request.contextPath}/book/deleteBook?id=${book.bookID}">删除</a> </td> </tr> </c:forEach> </table> </body> </html>

5、SSM 整合：添加书籍功能

5.1 跳转到添加页面

// 跳转到添加页面 @RequestMapping("/toAdd") public String toAdd() { return "addBook"; }

5.2 编写添加页面 addBook.jsp

jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>添加书籍</title> </head> <body> <h1>添加书籍</h1> <form action="${pageContext.request.contextPath}/book/addBook" method="post"> 书籍名称：<input type="text" name="bookName" required><br/> 书籍数量：<input type="text" name="bookCounts" required><br/> 书籍描述：<input type="text" name="detail" required><br/> <input type="submit" value="添加"> </form> </body> </html>

5.3 执行添加

// 添加书籍 @RequestMapping("/addBook") public String addBook(Book book) { bookService.addBook(book); return "redirect:/book/allBook"; }

6、SSM 整合：修改书籍功能

6.1 跳转到修改页面（回显数据）

// 跳转到修改页面 @RequestMapping("/toUpdate") public String toUpdate(int id, Model model) { Book book = bookService.queryBookById(id); model.addAttribute("book", book); return "updateBook"; }

6.2 修改页面 updateBook.jsp

jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>修改书籍</title> </head> <body> <h1>修改书籍</h1> <form action="${pageContext.request.contextPath}/book/updateBook" method="post"> <input type="hidden" name="bookID" value="${book.bookID}"> 书籍名称：<input type="text" name="bookName" value="${book.bookName}"><br/> 书籍数量：<input type="text" name="bookCounts" value="${book.bookCounts}"><br/> 书籍描述：<input type="text" name="detail" value="${book.detail}"><br/> <input type="submit" value="修改"> </form> </body> </html>

6.3 执行修改

// 修改书籍 @RequestMapping("/updateBook") public String updateBook(Book book) { bookService.updateBook(book); return "redirect:/book/allBook"; }

7、SSM 整合：删除书籍功能

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

8、SSM 整合：查询书籍（模糊搜索）

8.1 Controller

// 模糊查询 @RequestMapping("/queryBook") public String queryBook(String queryBookName, Model model) { List<Book> bookList = bookService.queryBookByName(queryBookName); model.addAttribute("bookList", bookList); return "bookList"; }

8.2 在 bookList.jsp 中添加搜索框

jsp

<form action="${pageContext.request.contextPath}/book/queryBook" method="post"> <input type="text" name="queryBookName" placeholder="输入书籍名称"> <input type="submit" value="搜索"> </form>

9、IDEA 部署 Tomcat 测试

1. 配置 Tomcat 服务器
2. 部署项目 war 包
3. 启动访问：http://localhost:8080/book/allBook