SSM整合《学习笔记》

news/2024/11/24 9:47:45/

SSM整合

1、ContextLoaderListener

Spring提供了监听器ContextLoaderListener，实现ServletContextListener接口，可监听

ServletContext的状态，在web服务器的启动，读取Spring的配置文件，创建Spring的IOC容器。web

应用中必须在web.xml中配置

<listener><!--配置Spring的监听器，在服务器启动时加载Spring的配置文件Spring配置文件默认位置和名称：/WEB-INF/applicationContext.xml可通过上下文参数自定义Spring配置文件的位置和名称--><listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!--自定义Spring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>

2、准备工作

①创建Maven Module

②导入依赖

<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

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</filterclass>
</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</servletclass><!-- 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、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"><beanclass="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 />

5、搭建MyBatis环境

①创建属性文件jdbc.properties

jdbc.user=root
jdbc.password=atguigu
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

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>

6、创建Spring的配置文件并配置

<?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/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/contexthttps://www.springframework.org/schema/context/spring-context.xsd"><!--扫描组件--><context:component-scan base-package="com.atguigu.ssm"><context:exclude-filter type="annotation"expression="org.springframework.stereotype.Controller"/></context:component-scan><!-- 引入jdbc.properties --><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 --><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--><bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"><property name="basePackage" value="com.atguigu.ssm.mapper"></property></bean>
</beans>

7、测试功能

①创建组件

实体类Employee

public class Employee {private Integer empId;private String empName;private Integer age;private String sex;private String email;public Employee() {}public Employee(Integer empId, String empName, Integer age, String sex,String email) {this.empId = empId;this.empName = empName;this.age = age;this.sex = sex;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 getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}
}

创建控制层组件EmployeeController

@Controller
public class EmployeeController {@Autowiredprivate 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 {@Autowiredprivate EmployeeMapper employeeMapper;@Overridepublic 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>Employee Info</title><link rel="stylesheet" th:href="@{/static/css/index_work.css}"></head><body><table><tr><th colspan="6">Employee Info</th></tr><tr><th>emp_id</th><th>emp_name</th><th>age</th><th>sex</th><th>email</th><th>options</th></tr><tr th:each="employee : ${page.list}"><td th:text="${employee.empId}"></td><td th:text="${employee.empName}"></td><td th:text="${employee.age}"></td><td th:text="${employee.sex}"></td><td th:text="${employee.email}"></td><td><a href="">delete</a><a href="">update</a></td></tr><tr><td colspan="6"><span th:if="${page.hasPreviousPage}"><a th:href="@{/employee/page/1}">首页</a><a th:href="@{'/employee/page/'+${page.prePage}}">上一页</a></span><span th:each="num : ${page.navigatepageNums}"><a th:if="${page.pageNum==num}"th:href="@{'/employee/page/'+${num}}" th:text="'['+${num}+']'" style="color:red;"></a><a th:if="${page.pageNum!=num}"th:href="@{'/employee/page/'+${num}}" th:text="${num} "></a></span><span th:if="${page.hasNextPage}"><a th:href="@{'/employee/page/'+${page.nextPage}}">下一页</a><a th:href="@{'/employee/page/'+${page.pages}}">末页</a></span></td></tr></table></body>
</html>

③访问测试分页功能

localhost:8080/employee/page/1


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