SSM框架实例（单表查询）

SSM，即Spring+Spring MVC+Mybatis框架

要求：

基于SSM框架的做一个关于教室信息的增删改查

步骤：

一、创建数据库并添加部分测试数据

该实例使用的是MySQL，DBMS为sqlyog

建立表，注意字符集设置：

添加部分测试数据：

二、创建Maven项目

略

三、配置依赖包

注意，同类型依赖包版本必需一致
以及mysql-connector-java版本要与本地mysql版本对应，否则会报错。

  <dependencies><!--该依赖包是spring框架必需--><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>5.2.8.RELEASE</version></dependency><!--该依赖包是jdbc连接必需--><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.2.8.RELEASE</version></dependency><!--该依赖包是spring mvc框架必需--><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.2.8.RELEASE</version></dependency><!--该依赖包是mybatis框架必需--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis</artifactId><version>3.5.4</version></dependency><!--该依赖包是spring和mybatis整合必需--><dependency><groupId>org.mybatis</groupId><artifactId>mybatis-spring</artifactId><version>2.0.4</version></dependency><!--该依赖包是mysql数据库连接必需--><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.19</version></dependency><!--该依赖包是连接池--><dependency><groupId>org.apache.commons</groupId><artifactId>commons-dbcp2</artifactId><version>2.8.0</version></dependency><!--该依赖包是简化实体类getter、setter、toString--><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.12</version></dependency><!--该依赖包是jstl工具类--><dependency><groupId>javax.servlet</groupId><artifactId>jstl</artifactId><version>1.2</version></dependency></dependencies>

以及为了保证找到xml配置文件所必需配置（代码放在build里面）：

<resources><resource><directory>src/main/java</directory><includes><include>**/*.xml</include></includes></resource></resources>
``

四、编写配置文件

①db.properties
jdbc.driver = com.mysql.cj.jdbc.Driver (这里注意，较新版本的mysql要添加.cj，但旧版本一定不要添加，否则报错，复制时记得删除括号及内容)
jdbc.url = jdbc:mysql://localhost:3306/数据库名?useUnicode=true&useSSL=false&characterEncoding=UTF-8&useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
jdbc.username = 数据库账号
jdbc.password = 数据库密码
jdbc.maxTotal=30
jdbc.maxIdle=10
jdbc.initialSize=5

② spring-config.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:aop="http://www.springframework.org/schema/aop"xmlns:tx="http://www.springframework.org/schema/tx"xmlns:context="http://www.springframework.org/schema/context"xmlns:mvc="http://www.springframework.org/schema/mvc"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/txhttp://www.springframework.org/schema/tx/spring-tx.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/mvc https://www.springframework.org/schema/mvc/spring-mvc.xsd"><!--上面建议直接全部复制，包含了切面、事务管理必需的配置--><!--自动扫描注解--><context:component-scan base-package="cn.edu.ujn.guoxy392"></context:component-scan><!--数据库的数据源--><context:property-placeholder location="classpath:db.properties"></context:property-placeholder><bean id="dataSource" class="org.apache.commons.dbcp2.BasicDataSource"><property name="driverClassName" value="${jdbc.driver}" /><property name="url" value="${jdbc.url}" /><property name="username" value="${jdbc.username}" /><property name="password" value="${jdbc.password}" /><property name="maxTotal" value="${jdbc.maxTotal}" /><property name="maxIdle" value="${jdbc.maxIdle}" /><property name="initialSize" value="${jdbc.initialSize}" /></bean><!-- 事务管理器，依赖于数据源 --><bean id="transactionManager"class="org.springframework.jdbc.datasource.DataSourceTransactionManager"><property name="dataSource" ref="dataSource" /></bean><!-- 开启事务注解 --><tx:annotation-driven transaction-manager="transactionManager" /><!--配置MyBatis工厂 --><bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"><property name="dataSource" ref="dataSource" /><property name="configLocation"    value="classpath:mybatis-config.xml" /><property name="mapperLocations" value="classpath:cn/edu/ujn/guoxy392/dao/*.xml" /></bean><bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"><property name="basePackage" value="cn.edu.ujn.guoxy392.dao" /><property name="sqlSessionFactoryBeanName" value="sqlSessionFactory" /></bean></beans>

③mybaties-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><settings><!-- 延迟加载的开关 --><setting name="lazyLoadingEnabled" value="false" /><!-- 配置积极加载or按需加载 --><setting name="aggressiveLazyLoading" value="true" /><setting name="mapUnderscoreToCamelCase" value="true" /><setting name="logImpl" value="STDOUT_LOGGING" /></settings>
</configuration>

④springmvc-config.xml

<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:mvc="http://www.springframework.org/schema/mvc"xmlns:context="http://www.springframework.org/schema/context"xmlns:tx="http://www.springframework.org/schema/tx"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/mvchttp://www.springframework.org/schema/mvc/spring-mvc.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsd"><!-- 配置包扫描器 (Spring配置文件中已经配置，此处可以省略)--><context:component-scan base-package="cn.edu.ujn.guoxy392" /><!-- 加载注解驱动 --><mvc:annotation-driven /><!-- 配置视图解析器 --><bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"><property name="prefix" value="/" /><property name="suffix" value=".jsp" /></bean><mvc:annotation-driven><!-- 消息转换器 --><mvc:message-converters register-defaults="true"><bean class="org.springframework.http.converter.StringHttpMessageConverter"><property name="supportedMediaTypes" value="text/html;charset=UTF-8"></property></bean></mvc:message-converters></mvc:annotation-driven><mvc:annotation-driven conversion-service="conversionService"></mvc:annotation-driven><!-- 配置自定义转换器 --><bean id="conversionService" class="org.springframework.context.support.ConversionServiceFactoryBean"><property name="converters"><set><bean class="cn.edu.ujn.guoxy392.converter.DateConverter"></bean></set></property></bean>
</beans>

⑤web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee"xsi:schemaLocation="http://java.sun.com/xml/ns/javaeehttp://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"id="WebApp_ID" version="3.0"><context-param><param-name>contextConfigLocation</param-name><param-value>classpath:spring-config.xml</param-value></context-param><listener><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><servlet><!-- 配置前端过滤器 --><servlet-name>springmvc</servlet-name><servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class><!-- 初始化时加载配置文件 --><init-param><param-name>contextConfigLocation</param-name><param-value>classpath:springmvc-config.xml</param-value></init-param><!-- 表示容器在启动时立即加载Servlet --><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>springmvc</servlet-name><url-pattern>/</url-pattern></servlet-mapping><servlet-mapping><servlet-name>default</servlet-name><url-pattern>*.js</url-pattern></servlet-mapping><filter><filter-name>CharacterEncodingFilter</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>CharacterEncodingFilter</filter-name><url-pattern>/*</url-pattern></filter-mapping>
</web-app>

五、建立文件结构

如图：

entity：实体类层
dao：数据库操作层
service：业务逻辑层
controller：控制层（前后端交互）
converter：自定义的转换类

六、实体类

根据数据库内字段，如下：

package cn.edu.ujn.guoxy392.entity;
import lombok.Data;
import java.util.Date;
@Data
public class Classroom {private int id;private String roomname;private String roomnum;private String roomtype;private int seatnum;private String remark;private Date addtime;
}

为了方便，与字段名一致

七、Dao层

dao层包含了xml形式的映射文件和接口

接口：包含了所要写的所有对数据库操作的方法

package cn.edu.ujn.guoxy392.dao;
import cn.edu.ujn.guoxy392.entity.Classroom;
import java.util.List;
public interface ClassroomMapper {public int addClassroom(Classroom classroom);public int deleteClassroomById(int id);public int updateClassroomById(Classroom classroom);public Classroom findClassroomById(int id);public List<Classroom> findAll();
}

xml映射文件：
注意，namespace地址必须是上面的接口地址，每个标签（insert、delete等）的id与接口内方法名一致。

<?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="cn.edu.ujn.guoxy392.dao.ClassroomMapper"><insert id="addClassroom" parameterType="cn.edu.ujn.guoxy392.entity.Classroom">insert into info_classroom(roomname,roomnum,roomtype,seatnum,remark,addtime) values(#{roomname},#{roomnum},#{roomtype},#{seatnum},#{remark},#{addtime})</insert><delete id="deleteClassroomById" parameterType="int">delete from info_classroom where id = #{id}</delete><update id="updateClassroomById" parameterType="cn.edu.ujn.guoxy392.entity.Classroom">update info_classroom<set><if test="roomname!=null and roomname!=''">roomname = #{roomname},</if><if test="roomnum!=null and roomnum!=''">roomnum = #{roomnum},</if><if test="roomtype!=null and roomtype!=''">roomtype = #{roomtype},</if><if test="seatnum!=null and seatnum!=0">seatnum = #{seatnum},</if><if test="remark!=null and remark!=''">remark = #{remark},</if></set>where id = #{id}</update><select id="findAll" resultType="cn.edu.ujn.guoxy392.entity.Classroom">select * from info_classroom</select><select id="findClassroomById" parameterType="int" resultType="cn.edu.ujn.guoxy392.entity.Classroom">select * from info_classroom where id = #{id}</select>
</mapper>

八、service层

业务逻辑层，包含接口、实现类

接口：

package cn.edu.ujn.guoxy392.service;
import cn.edu.ujn.guoxy392.entity.Classroom;
import java.util.List;
public interface IClassroomService {public int addClassroom(Classroom classroom);public int deleteClassroomById(int id);public int updateClassroomById(Classroom classroom);public Classroom findClassroomById(int id);public List<Classroom> findAll();
}

实现类：

注意添加注解

package cn.edu.ujn.guoxy392.service;
import cn.edu.ujn.guoxy392.dao.ClassroomMapper;
import cn.edu.ujn.guoxy392.entity.Classroom;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;@Service("classroomService")
public class ClassroomServiceImpl implements IClassroomService{@Autowiredprivate ClassroomMapper classroomMapper;@Overridepublic int addClassroom(Classroom classroom) {return classroomMapper.addClassroom(classroom);}@Overridepublic int deleteClassroomById(int id) {return classroomMapper.deleteClassroomById(id);}@Overridepublic int updateClassroomById(Classroom classroom) {return classroomMapper.updateClassroomById(classroom);}@Overridepublic Classroom findClassroomById(int id) {return classroomMapper.findClassroomById(id);}@Overridepublic List<Classroom> findAll() {return classroomMapper.findAll();}
}

九、controller层

package cn.edu.ujn.guoxy392.controller;
import cn.edu.ujn.guoxy392.entity.Classroom;
import cn.edu.ujn.guoxy392.service.IClassroomService;
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("/classroom")
public class ClassroomHandler {@Autowiredprivate IClassroomService iClassroomService;@RequestMapping("/findClassroomById")public String findClassroomById(Model model){Classroom classroom = iClassroomService.findClassroomById(1);model.addAttribute("classroom", classroom);return "main";}@RequestMapping("addClassroom")public String addClassroom(Classroom classroom){iClassroomService.addClassroom(classroom);return "redirect:/classroom/findAll";}@RequestMapping("/deleteClassroomById")public String deleteClassroomById(int id){iClassroomService.deleteClassroomById(id);return "redirect:/classroom/findAll";}@RequestMapping("/updateClassroomById")public String updateClassroomById(Classroom classroom){iClassroomService.updateClassroomById(classroom);return "redirect:/classroom/findAll";}@RequestMapping("/findAll")public String findAll(Model model){List<Classroom> list = iClassroomService.findAll();model.addAttribute("classroom",list);return "show";}
}

十、自定义转换类

package cn.edu.ujn.guoxy392.converter;
import org.springframework.core.convert.converter.Converter;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;public class DateConverter implements Converter<String, Date> {private String pattern = "yyyy-mm-dd HH:mm:ss";@Overridepublic Date convert(String s) {SimpleDateFormat sdf = new SimpleDateFormat(pattern);try {return sdf.parse(s);} catch (ParseException e) {throw new IllegalArgumentException("无效的日期格式，请使用这种格式："+pattern);}}
}

十一、前端

show：

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--Created by IntelliJ IDEA.User: asusDate: 2020/10/29Time: 19:43To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page isELIgnored="false" %>
<html>
<head><title>Title</title>
</head>
<body>
<h1>Welcome！</h1>
<table border=1><tr><td align="center">编号</td><td align="center">教室名</td><td align="center">教室编号</td><td align="center">教室类型</td><td align="center">座位数量</td><td align="center">备注</td><td align="center">添加时间</td><td align="center">操作</td></tr><c:forEach items="${classroom}" var="classroom"><tr><td align="center">${classroom.id}</td><td align="center">${classroom.roomname}</td><td align="center">${classroom.roomnum}</td><td align="center">${classroom.roomtype}</td><td align="center">${classroom.seatnum}</td><td align="center">${classroom.remark}</td><td align="center">${classroom.addtime}</td><td align="center"><a href="/classroom/deleteClassroomById?id=${classroom.id}">删除</a>  <a href="/updateClassroom.jsp?id=${classroom.id}&roomname=${classroom.roomname}&roomnum=${classroom.roomnum}&roomtype=${classroom.roomtype}&seatnum=${classroom.seatnum}&remark=${classroom.remark}">修改</a> </td></tr></c:forEach>
</table>
<br/>
<a href="/addClassroom.jsp">添加新用户</a>
</body>
</html>

addClassroom：

<%--Created by IntelliJ IDEA.User: asusDate: 2020/11/17Time: 10:45To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>Title</title>
</head>
<body>
<form action="/classroom/addClassroom">教室名：<input type="text" name="roomname">教室编号：<input type="text" name="roomnum">教室类型：<input type="text" name="roomtype">座位数量：<input type="text" name="seatnum">备注：<input type="text" name="remark">添加时间(yyyy-MM-DD HH:MM:SS)：<input type="text" name="addtime"><input type="submit" value="提交">
</form>
</body>
</html>

updateClassroom：

<%--Created by IntelliJ IDEA.User: asusDate: 2020/11/17Time: 10:43To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head><title>Title</title>
</head>
<body>
<form action="/classroom/updateClassroomById"><input type="hidden" name="id" value="${param.id}" readonly="readonly">教室名：<input type="text" name="roomname" value="${param.roomname}">教室编号：<input type="text" name="roomnum" value="${param.roomnum}">教室类型：<input type="text" name="roomtype" value="${param.roomtype}">座位数量：<input type="text" name="seatnum" value="${param.seatnum}">备注：<input type="text" name="remark" value="${param.remark}"><input type="submit" value="提交">
</form>
</body>
</html>

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