4.2、准备工作
①创建Maven Module
②导入依赖
<properties</properties>
只能有一个,整合即可
`
<packaging>war</packaging> <properties> <spring.version>5.3.1</spring.version> </properties> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-beans</artifactId> <version>${spring.version}</version> </dependency> <!--springmvc--> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-aspects</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-test</artifactId> <version>${spring.version}</version> </dependency> <!-- Mybatis核心 --> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis</artifactId> <version>3.5.7</version> </dependency> <!--mybatis和spring的整合包--> <dependency> <groupId>org.mybatis</groupId> <artifactId>mybatis-spring</artifactId> <version>2.0.6</version> </dependency> <!-- 连接池 --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.0.9</version> </dependency> <!-- junit测试 --> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> <scope>test</scope> </dependency> <!-- MySQL驱动 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.16</version> </dependency> <!-- log4j日志 --> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> <!-- https://mvnrepository.com/artifact/com.github.pagehelper/pagehelper --> <dependency> <groupId>com.github.pagehelper</groupId> <artifactId>pagehelper</artifactId> <version>5.2.0</version> </dependency> <!-- 日志 --> <dependency> <groupId>ch.qos.logback</groupId> <artifactId>logback-classic</artifactId> <version>1.2.3</version> </dependency> <!-- ServletAPI --> <dependency> <groupId>javax.servlet</groupId> <artifactId>javax.servlet-api</artifactId> <version>3.1.0</version> <scope>provided</scope> </dependency> <dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.12.1</version> </dependency> <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.1</version> </dependency> <!-- Spring5和Thymeleaf整合包 --> <dependency> <groupId>org.thymeleaf</groupId> <artifactId>thymeleaf-spring5</artifactId> <version>3.0.12.RELEASE</version> </dependency> </dependencies>
③创建表
CREATE TABLE `t_emp` ( `emp_id` int(11) NOT NULL AUTO_INCREMENT, `emp_name` varchar(20) DEFAULT NULL, `age` int(11) DEFAULT NULL, `sex` char(1) DEFAULT NULL, `email` varchar(50) DEFAULT NULL, PRIMARY KEY (`emp_id`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8
4.3、配置web.xml
<!-- 配置Spring的编码过滤器 --> <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> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>CharacterEncodingFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!-- 配置处理请求方式PUT和DELETE的过滤器 --> <filter> <filter-name>HiddenHttpMethodFilter</filter-name> <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class> </filter> <filter-mapping> <filter-name>HiddenHttpMethodFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!-- 配置SpringMVC的前端控制器 --> <servlet> <servlet-name>DispatcherServlet</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!-- 设置SpringMVC的配置文件的位置和名称 --> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:SpringMVC.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> <!-- 设置Spring的配置文件的位置和名称 --> <context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:Spring.xml</param-value> </context-param> <!-- 配置Spring的监听器 --> <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener>
4.4、创建SpringMVC的配置文件并配置
<!--扫描组件--> <context:component-scan base-package="com.atguigu.ssm.controller"> </context:component-scan> <!--配置视图解析器--> <bean id="viewResolver" class="org.thymeleaf.spring5.view.ThymeleafViewResolver"> <property name="order" value="1"/> <property name="characterEncoding" value="UTF-8"/> <property name="templateEngine"> <bean class="org.thymeleaf.spring5.SpringTemplateEngine"> <property name="templateResolver"> <bean class="org.thymeleaf.spring5.templateresolver.SpringResourceTemplateResolver"> <!-- 视图前缀 --> <property name="prefix" value="/WEB-INF/templates/"/> <!-- 视图后缀 --> <property name="suffix" value=".html"/> <property name="templateMode" value="HTML5"/> <property name="characterEncoding" value="UTF-8" /> </bean> </property> </bean> </property> </bean> <!-- 配置访问首页的视图控制 --> <mvc:view-controller path="/" view-name="index"></mvc:view-controller> <!-- 配置默认的servlet处理静态资源 --> <mvc:default-servlet-handler /> <!-- 开启MVC的注解驱动 --> <mvc:annotation-driven />
4.5、搭建MyBatis环境
4.5、搭建MyBatis环境
①创建属性文件jdbc.properties
jdbc.username=root jdbc.password=789632145 jdbc.url=jdbc:mysql://localhost:3306/ssm?serverTimezone=UTC jdbc.driver=com.mysql.cj.jdbc.Driver
②创建MyBatis的核心配置文件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> <settings> <!--将下划线映射为驼峰--> <setting name="mapUnderscoreToCamelCase" value="true"/> </settings> <plugins> <!--配置分页插件--> <plugin interceptor="com.github.pagehelper.PageInterceptor"></plugin> </plugins> </configuration>
③创建Mapper接口和映射文件
注意:映射文件的路径用/别用.
public interface EmployeeMapper { List<Employee> getEmployeeList(); }
<?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.atguigu.ssm.mapper.EmployeeMapper"> <select id="getEmployeeList" resultType="Employee"> select * from t_emp </select> </mapper>
④创建日志文件log4j.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"> <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"> <appender name="STDOUT" class="org.apache.log4j.ConsoleAppender"> <param name="Encoding" value="UTF-8" /> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%-5p %d{MM-dd HH:mm:ss,SSS} %m (%F:%L) \n" /> </layout> </appender> <logger name="java.sql"> <level value="debug" /> </logger> <logger name="org.apache.ibatis"> <level value="info" /> </logger> <root> <level value="debug" /> <appender-ref ref="STDOUT" /> </root> </log4j:configuration>
4.6、创建Spring的配置文件并配置
ioc管理的是sqlsessionfactoryBean 这个是sqlsessionFactory的实现类,当自动装配是接口的时候,能够匹配到当前类或者当前接口的实现类
数据源和事务管理在spring中配置了,就可以在mybatis中删去了
<?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 http://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 http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd"> <!--扫描除控制层以外的组件--> <context:component-scan base-package="com.atguigu.ssm"> <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/> </context:component-scan> <context:property-placeholder location="classpath:jdbc.properties"></context:property-placeholder> <!-- 配置Druid数据源 --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"> <property name="driverClassName" value="${jdbc.driver}"></property> <property name="url" value="${jdbc.url}"></property> <property name="username" value="${jdbc.username}"></property> <property name="password" value="${jdbc.password}"></property> </bean> <!-- 配置用于创建SqlSessionFactory的工厂bean ,提供的对象就是SqlSessionFactory,和普通工厂的区别: 普通工厂:先获取ioc,再获取工厂的bean,再通过工厂获得工厂所提供的对象,工厂bean就不用获取工厂了可以直接获取工厂所提供的对象--> <bean class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 设置MyBatis配置文件的路径(可以不设置) --> <property name="configLocation" value="classpath:mybatis-config.xml"> </property> <!-- 设置数据源 --> <property name="dataSource" ref="dataSource"></property> <!-- 设置类型别名所对应的包 --> <property name="typeAliasesPackage" value="com.atguigu.ssm.pojo"> </property> <!-- 设置映射文件的路径 若映射文件所在路径和mapper接口所在路径一致,则不需要设置 --> <!-- <property name="mapperLocations" value="classpath:mapper/*.xml"> </property> --> </bean> <!-- 配置mapper接口的扫描配置 由mybatis-spring提供,可以将指定包下所有的mapper接口创建动态代理 并将这些动态代理作为IOC容器的bean管理 省略了 SqlSession sqlSession = factory.openSession(); BrandMapper mapper = sqlSession.getMapper(BrandMapper.class); 这个过程 --> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.atguigu.ssm.mapper"></property> </bean> <!--开启事务的注解驱动 将使用注解@Transactional标识的方法或类中所有的方法进行事务管理 --> <tx:annotation-driven transaction-manager="transactionManager"></tx:annotation-driven> <!--配置事务管理器--> <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager"> <property name="dataSource" ref="dataSource"> </property> </bean> </beans>
第二个如果使用的是sqlSessionFactoryBean的默认名字就不需要配置,只有像下面这样才需要配置
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="dataSource" ref="dataSource"/> <!-- configLocation的属性值为MyBatis的核心配置文件 --> <property name="configLocation" value="classpath:mybatis-config.xml"/> </bean> ``` 正因为这里配置类sqlsessionfactory和接口的路径所以如果mapper配置文件和接口文件路径一样则不需要配置
## 4.7、测试功能 ### ①创建组件 实体类Employee ```java package com.atguigu.ssm.pojo; /** * Date:2022/7/11 * Author:ybc * Description: */ public class Employee { private Integer empId; private String empName; private Integer age; private String gender; private String email; public Employee() { } public Employee(Integer empId, String empName, Integer age, String gender, String email) { this.empId = empId; this.empName = empName; this.age = age; this.gender = gender; this.email = email; } public Integer getEmpId() { return empId; } public void setEmpId(Integer empId) { this.empId = empId; } public String getEmpName() { return empName; } public void setEmpName(String empName) { this.empName = empName; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } public String getGender() { return gender; } public void setGender(String gender) { this.gender = gender; } public String getEmail() { return email; } public void setEmail(String email) { this.email = email; } @Override public String toString() { return "Employee{" + "empId=" + empId + ", empName='" + empName + '\'' + ", age=" + age + ", gender='" + gender + '\'' + ", email='" + email + '\'' + '}'; } }
创建控制层组件EmployeeController
@Controller public class EmployeeController { @Autowired private EmployeeService employeeService; @RequestMapping(value = "/employee/page/{pageNum}", method = RequestMethod.GET) public String getEmployeeList(Model model, @PathVariable("pageNum") Integer pageNum){ PageInfo<Employee> page = employeeService.getEmployeeList(pageNum); model.addAttribute("page", page); return "employee_list"; } }
创建接口EmployeeService
public interface EmployeeService { PageInfo<Employee> getEmployeeList(Integer pageNum); }
创建实现类EmployeeServiceImpl
@Service public class EmployeeServiceImpl implements EmployeeService { @Autowired private EmployeeMapper employeeMapper; @Override public PageInfo<Employee> getEmployeeList(Integer pageNum) { PageHelper.startPage(pageNum, 4); List<Employee> list = employeeMapper.getEmployeeList(); PageInfo<Employee> page = new PageInfo<>(list, 5); return page; } }
②创建页面
<!DOCTYPE html> <html lang="en" xmlns:th="http://www.thymeleaf.org"> <head> <meta charset="UTF-8"> <title>员工列表</title> <link rel="stylesheet" th:href="@{/static/css/index_work.css}"> </head> <body> <table> <tr> <th colspan="6">员工列表</th> </tr> <tr> <th>流水号</th> <th>员工姓名</th> <th>年龄</th> <th>性别</th> <th>邮箱</th> <th>操作</th> </tr> <tr th:each="employee,status : ${page.list}"> <!-- status.count获取循环的次数 --> <td th:text="${status.count}"></td> <td th:text="${employee.empName}"></td> <td th:text="${employee.age}"></td> <td th:text="${employee.gender}"></td> <td th:text="${employee.email}"></td> <td> <a href="">删除</a> <a href="">修改</a> </td> </tr> </table> <div style="text-align: center;"> <a th:if="${page.hasPreviousPage}" th:href="@{/employee/page/1}">首页</a> <a th:if="${page.hasPreviousPage}" th:href="@{'/employee/page/'+${page.prePage}}">上一页</a> <span th:each="num : ${page.navigatepageNums}"> <a th:if="${page.pageNum == num}" style="color: red;" th:href="@{'/employee/page/'+${num}}" th:text="'['+${num}+']'"></a> <a th:if="${page.pageNum != num}" th:href="@{'/employee/page/'+${num}}" th:text="${num}"></a> </span> <a th:if="${page.hasNextPage}" th:href="@{'/employee/page/'+${page.nextPage}}">下一页</a> <a th:if="${page.hasNextPage}" th:href="@{'/employee/page/'+${page.pages}}">末页</a> </div> </body> </html>
③访问测试分页功能
localhost:8080/employee/page/1