回忆了 Spring、SpringMVC、MyBatis 框架整合,完善一个小demo,包括基本的增删改查功能。
开发环境
- IDEA
- MySQL 5.7
- Tomcat 9
- Maven 3.2.5
- 需要熟练掌握MySQL数据库(建表和增删改查语句等,Spring,JavaWeb基础及MyBatis知识,简单的前端知识;
数据库环境
CREATE DATABASE `ssmbuild`; USE `ssmbuild`; 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');
开发项目首先搭建基本的环境
- 新建一Maven项目!SSM , 添加web的支持
- 导入相关的pom依赖!
<?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> <groupId>jiachuixun</groupId> <artifactId>SSM</artifactId> <version>1.0-SNAPSHOT</version> <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>8.0.19</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> <!-- lombok--> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.8</version> <scope>provided</scope> </dependency> <!--AOP 织入器--> <dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.9.4</version> </dependency> </dependencies> </project>
3.Maven资源过滤配置
<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>
建议基本结构和配置框架
- com.jia.controller (控制层)
- com.jia.mapper (持久层)
- com.jia.service (业务层)
- com.jia.pojo (实体类)
- mybatis-config
<?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>
Mybatis层编写配置
1. 数据库配置文件 database.properties
jdbc.driver=com.mysql.cj.jdbc.Driver # 如果使用的是MySQL8.0+ ,增加一个时区的配置 jdbc.url=jdbc:mysql://localhost:3306/books?useSSL=true&useUnicode=true&characterEncoding=utf8&serverTimezone=UTC jdbc.username=root jdbc.password=123456
2. 编写Mybatis核心配置文件
<?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.jia.pojo"/> </typeAliases> <mappers> <package name="com.jia.mapper"/> </mappers> </configuration>
3. 编写数据库对应的实体类com.jia.pojo.Books (使用lombok插件)
package com.jia.pojo; import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; @Data @AllArgsConstructor @NoArgsConstructor public class Books { private int bookId; private String bookName; private int bookCounts; private String detail; }
4. 编写mapper层的接口:BooksMapper
package com.jia.mapper; import com.jia.pojo.Books; import org.apache.ibatis.annotations.Param; import java.util.List; public interface BooksMapper { //添加数据 int addBooks(Books books); //删除数据 int deleteBookById(@Param("bookId") int id); //更新数据 int updateBook(Books books); //查询一条数据 Books queryBookById(@Param("bookId") int id); //查询全部数据 List<Books> queryAllBook(); //查询指定的书籍 Books queryBooksByName(@Param("bookName") String bookName); }
5. 编写接口对应的Mapper.xml文件:BooksMapper.xml
<?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.jia.mapper.BooksMapper"> <insert id="addBooks" parameterType="Books"> insert into Books (bookName, bookCounts, detail) values (#{bookName},#{bookCounts},#{detail}); </insert> <delete id="deleteBookById" parameterType="int"> delete from Books where bookId = #{bookId}; </delete> <update id="updateBook" parameterType="Books"> update Books set bookName=#{bookName},bookCounts=#{bookCounts},detail=#{detail} where bookId=#{bookId}; </update> <select id="queryBookById" resultType="Books" parameterType="int"> select * from Books where bookId=#{bookId}; </select> <select id="queryAllBook" resultType="Books"> select * from Books; </select> <select id="queryBooksByName" resultType="Books" parameterType="String"> select * from books where bookName=#{bookName} </select> </mapper>
6. 变写service层接口和实现类
BooksService接口:
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package com.jia.service; import com.jia.pojo.Books; import java.util.List; public interface BooksService { //添加数据 int addBooks(Books books); //删除数据 int deleteBookById(int id); //更新数据 int updateBook(Books books); //查询一条数据 Books queryBookById(int id); //查询全部数据 List<Books> queryAllBook(); //查询指定的书籍 Books queryBooksByName(String bookName); }
BookServiceImpl实现类:
package com.jia.service.impl; import com.jia.mapper.BooksMapper; import com.jia.pojo.Books; import com.jia.service.BooksService; import org.springframework.beans.factory.annotation.Autowired; import java.util.List; public class BooksServiceImpl implements BooksService { // 业务层 调用 持久层 @Autowired private BooksMapper booksMapper; // 添加set方法,方便Spring注入IOC容器中 public void setBooksMapper(BooksMapper booksMapper) { this.booksMapper = booksMapper; } public int addBooks(Books books) { return booksMapper.addBooks(books); } public int deleteBookById(int id) { return booksMapper.deleteBookById(id); } public int updateBook(Books books) { return booksMapper.updateBook(books); } public Books queryBookById(int id) { return booksMapper.queryBookById(id); } public List<Books> queryAllBook() { return booksMapper.queryAllBook(); } public Books queryBooksByName(String bookName) { return booksMapper.queryBooksByName(bookName); } }
Spring的配置
1. 配置Spring整合MyBatis,这里数据源使用c3p0连接池
2. 编写Spring整合MyBatis相关的配置,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"> <!--1.关联数据库配置文件--> <context:property-placeholder location="classpath:database.properties"/> <!--2.数据库连接池: dbcp 半自动化操作 不能自动连接 c3p0 自动化操作(自动的加载配置文件 并且设置到对象里面) druid 阿里巴巴出品 hikari SpringBoot默认 --> <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"> <!-- 注入数据库连接池 --> <property name="dataSource" ref="dataSource"/> <!-- 配置MyBaties全局配置文件:mybatis-config.xml --> <property name="configLocation" value="classpath:mybatis-config.xml"/> </bean> <!-- 4.配置扫描mapper接口包,动态实现mapper接口注入到Spring容器中 --> <bean id="scannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <!-- 注入sqlSessionFactory --> <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/> <!-- 给出需要扫描Dao接口包 --> <property name="basePackage" value="com.jia.mapper"/> </bean> </beans>
3. Spring配置service层
<?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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" 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/aop https://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd"> <bean id="booksService" class="com.jia.service.impl.BooksServiceImpl"> <property name="booksMapper" ref="booksMapper"/> </bean> <!-- 扫描service相关的bean --> <context:component-scan base-package="com.jia.service"/> <!-- 配置事务管理器 --> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <!-- 注入数据库连接池 --> <property name="dataSource" ref="dataSource" /> </bean> <!--aop 事务支持--> <tx:advice id="txAdice" transaction-manager="transactionManager"> <tx:attributes> <tx:method name="*" propagation="REQUIRED"/> </tx:attributes> </tx:advice> <!--配置事务切入--> <aop:config> <!--切入点--> <aop:pointcut id="txPointCut" expression="execution(* com.jia.mapper.*.*(..))"/> <aop:advisor advice-ref="txAdice" pointcut-ref="txPointCut"/> </aop:config> </beans>
SpringMVC层配置
1. 首先项目添加框架支持Web,修改WEB-INF文件下web.xml文件内容
<?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"> <!--DispatcherServlet--> <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> <!--encodingFilter--> <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>
2. 配置编写 spring-mvc.xml 文件
<?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 --> <!-- 1.开启SpringMVC注解驱动 --> <mvc:annotation-driven/> <!-- 2.静态资源默认servlet配置--> <mvc:default-servlet-handler/> <!-- 3.配置jsp 显示ViewResolver视图解析器 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/jsp/" /> <property name="suffix" value=".jsp" /> </bean> <!-- 4.扫描web相关的bean --> <context:component-scan base-package="com.jia.controller"/> </beans>
3. Spring配置整合文件: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"> <import resource="classpath:spring-dao.xml"/> <import resource="classpath:spring-service.xml"/> <import resource="classpath:spring-mvc.xml"/> </beans>
以上架构基本配置完成!剩下的就是编写需求实现具体的功能!
Controller 和 View
1. BookController 类编写
package com.jia.controller; import com.jia.pojo.Books; import com.jia.service.BooksService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import java.util.ArrayList; import java.util.List; @Controller @RequestMapping("/book") public class BooksController { // controller层 调用 service层 @Autowired @Qualifier("booksService") private BooksService booksService; // 查询全部的数据,并且返回到一个数据展示页面 @RequestMapping("/allBook") public String list(Model model){ List<Books> books = booksService.queryAllBook(); model.addAttribute("list",books); return "allBook"; } // 跳转到添加书籍页面 @RequestMapping("/toAddPaper") public String toAddPaper(){ return "addBook"; } // 添加书籍请求 @RequestMapping("/addBook") public String addBook(Books books){ System.out.println("addBook-->"+books); booksService.addBooks(books); return "redirect:/book/allBook"; } // 跳转到修改页面 @RequestMapping("/toUpdate") public String toUpdatePaper(int id,Model model){ Books books = booksService.queryBookById(id); model.addAttribute("Qbook",books); return "updateBook"; } // 修改书籍 @RequestMapping("/updateBook") public String updateBook(Books books){ System.out.println("updateBook-->"+books); booksService.updateBook(books); return "redirect:/book/allBook"; } // 删除书籍 @RequestMapping("/deleteBook/{bookId}") public String deleteBook(@PathVariable("bookId") int id){ booksService.deleteBookById(id); return "redirect:/book/allBook"; } // 查询书籍 @RequestMapping("/queryBook") public String queryBook(String bookName,Model model){ Books books = booksService.queryBooksByName(bookName); List<Books> list = new ArrayList<Books>(); list.add(books); if (books == null){ list = booksService.queryAllBook(); model.addAttribute("error","未查到相关内容"); } model.addAttribute( "list", list); return "allBook"; } }
2. 编写首页 index.jsp (页面有点简陋,基本的功能都有CRUD)
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>$Title$</title> <style> a { text-decoration: none; color: black; font-size: 18px; } h3 { width: 180px; height: 38px; margin: 100px auto; text-align: center; line-height: 38px; background: deepskyblue; border-radius: 4px; } </style> </head> <body> <h3> <a href="${pageContext.request.contextPath}/book/allBook">登录</a> </h3> </body> </html>
2. 数据展示页面 allBook.jsp
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>书籍列表</title> <!-- 引入 Bootstrap --> <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> </head> <body> <div class="container"> <div class="row clearfix"> <div class="col-md-12 column"> <div class="page-header"> <h1> <small>书籍列表 —— 显示所有书籍</small> </h1> </div> </div> <div class="row"> <div class="col-md-4 column"> <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/toAddPaper">添加书籍</a> <a class="btn btn-primary" href="${pageContext.request.contextPath}/book/allBook">显示全部书籍</a> </div> <div class="col-md-4 column"></div> <div class="col-md-4 column"> <%--查询书籍--%> <form class="form-inline" action="${pageContext.request.contextPath}/book/queryBook" method="post" style="float: right"> <span style="color:red;font-weight: bold">${error}</span> <input type="text" name="bookName" class="form-control" placeholder="查询书籍的名称"> <input type="submit" class="btn btn-primary" value="查询"> </form> </div> </div> </div> <div class="row clearfix"> <div class="col-md-12 column"> <table class="table table-hover table-striped"> <thead> <tr> <th>书籍编号</th> <th>书籍名字</th> <th>书籍数量</th> <th>书籍详情</th> <th>操作</th> </tr> </thead> <tbody> <c:forEach var="book" items="${list}"> <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> | <a href="${pageContext.request.contextPath}/book/deleteBook/${book.bookId}">删除</a> </td> </tr> </c:forEach> </tbody> </table> </div> </div> </div>
3. 添加书籍页面 addBook.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>添加书籍</title> <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> </head> <body> <div class="container"> <div class="row clearfix"> <div class="col-md-12 column"> <div class="page-header"> <h1> <small>添加数据</small> </h1> </div> </div> </div> <form action="${pageContext.request.contextPath}/book/addBook" method="post"> <div class="form-group"> <label>书籍名称</label> <input type="text" class="form-control" name="bookName" placeholder="输入书籍名称" required> </div> <div class="form-group"> <label>书籍数量</label> <input type="text" class="form-control" name="bookCounts" placeholder="输入书籍数量" required> </div> <div class="form-group"> <label>书籍详情</label> <input type="text" class="form-control" name="detail" placeholder="输入书籍详情" required> </div> <button type="submit" class="btn btn-primary">添加</button> </form> </div> </body> </html>
4. 修改书籍页面 updateBook.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>修改书籍</title> <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> </head> <body> <div class="container"> <div class="row clearfix"> <div class="col-md-12 column"> <div class="page-header"> <h1> <small>修改数据</small> </h1> </div> </div> </div> <form action="${pageContext.request.contextPath}/book/updateBook" method="post"> <%--前端传递隐藏域--%> <input type="hidden" name="bookId" value="${Qbook.bookId}"/> <div class="form-group"> <label>书籍名称</label> <input type="text" class="form-control" name="bookName" value="${Qbook.bookName}" placeholder="输入书籍名称" required> </div> <div class="form-group"> <label>书籍数量</label> <input type="text" class="form-control" name="bookCounts" value="${Qbook.bookCounts}" placeholder="输入书籍数量" required> </div> <div class="form-group"> <label>书籍详情</label> <input type="text" class="form-control" name="detail" value="${Qbook.detail}" placeholder="输入书籍详情" required> </div> <button type="submit" class="btn btn-primary">修改</button> </form> </div> </body> </html>
最后在IDEA里点击Tomcat服务器发布项目 OK完成!