一：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

    org.springframework.web.context.ContextLoaderListenercontextConfigLocationclasspath:spring.xml

二：准备工作

①创建Maven Module

②导入依赖

    war5.3.23org.springframeworkspring-context${spring.version}org.springframeworkspring-beans${spring.version}org.springframeworkspring-web${spring.version}org.springframeworkspring-webmvc${spring.version}org.springframeworkspring-jdbc${spring.version}org.springframeworkspring-aspects${spring.version}org.springframeworkspring-test${spring.version}org.mybatismybatis3.5.11org.mybatismybatis-spring2.0.6com.alibabadruid1.0.9junitjunit4.12testmysqlmysql-connector-java8.0.29log4jlog4j1.2.17com.github.pagehelperpagehelper5.2.0ch.qos.logbacklogback-classic1.2.3javax.servletjavax.servlet-api3.1.0providedcom.fasterxml.jackson.corejackson-databind2.12.1commons-fileuploadcommons-fileupload1.3.1org.thymeleafthymeleaf-spring53.0.12.RELEASE

三：配置web.xml

    CharacterEncodingFilterorg.springframework.web.filter.CharacterEncodingFilterencodingUTF-8forceEncodingtrueCharacterEncodingFilter/*HiddenHttpMethodFilterorg.springframework.web.filter.HiddenHttpMethodFilterHiddenHttpMethodFilter/*SpringMVCorg.springframework.web.servlet.DispatcherServletcontextConfigLocationclasspath:springmvc.xml1SpringMVC/org.springframework.web.context.ContextLoaderListenercontextConfigLocationclasspath:spring.xml

四：创建SpringMVC的配置文件并配置

五：搭建MyBatis环境

①创建属性文件jdbc.properties

jdbc.driver=com.mysql.cj.jdbc
jdbc.url=jdbc:mysql://localhost:3306/ssm?serverTimezone=UTC
jdbc.username=root
jdbc.password=abc123

②创建MyBatis的核心配置文件mybatis-config.xml

③创建Mapper接口和映射文件 

public interface EmployeeMapper {
}

④创建日志文件log4j.xml

六：创建Spring的配置文件并配置

七：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;}@Overridepublic String toString() {return "Employee{" +"empId=" + empId +", empName='" + empName + '\'' +", age=" + age +", sex='" + sex + '\'' +", email='" + email + '\'' +'}';}
}

创建控制层组件EmployeeController

/*** 查询所有的员工信息-->/employee-->get* 根据id查询员工信息-->/employee/1-->get* 跳转到添加页面-->/to/add-->get* 添加员工信息-->/employee-->post* 修改员工信息-->/employee-->put* 删除员工信息-->/employee/1-->delete*/
@Controller
public class EmployeeController {@Autowiredprivate EmployeeService employeeService;@RequestMapping(value = "/employee",method = RequestMethod.GET)public String getAllEmployee(Model model){//查询所有的员工信息List list = employeeService.getAllEmployee();//将员工信息在请求域中共享model.addAttribute("list",list);//跳转到employee_list.htmlreturn "employee_list";}
}

创建接口EmployeeService

public interface EmployeeService {/*** 查询所有的员工信息* @return*/List getAllEmployee();
}

创建实现类EmployeeServiceImpl

@Service
@Transactional
public class EmployeeServiceImpl implements EmployeeService {@Autowiredprivate EmployeeMapper employeeMapper;@Overridepublic List getAllEmployee() {return employeeMapper.getAllEmployee();}
}

在Mapper接口中添加方法

public interface EmployeeMapper {/*** 查询所有的员工信息* @return*/List getAllEmployee();
}

 在Mapper配置文件中写我们需要操作的sql语句

select * from t_emp

②创建页面

index.html

index.html
查询所有的员工信息

employee_list.html

    
流水号
员工姓名
年龄
性别
邮箱
操作
删除修改

③访问测试分页功能

controller层方法：

    @RequestMapping(value = "/employee/page/{pageNum}",method = RequestMethod.GET)public String getEmployeePage(@PathVariable("pageNum") Integer pageNum,Model model) {//获取员工的分页信息PageInfo page = employeeService.getEmployeePage(pageNum);//将分页数据共享到请求域中model.addAttribute("page",page);//跳转到employee_list.htmlreturn "employee_list";}

 service接口以及实现类

    /*** 获取员工的分页信息* @param pageNum* @return*/PageInfo getEmployeePage(Integer pageNum);

    @Overridepublic PageInfo getEmployeePage(Integer pageNum) {//开启分页功能PageHelper.startPage(pageNum,4);//查询所有的员工信息List list = employeeMapper.getAllEmployee();//获取分页相关数据PageInfo page = new PageInfo<>(list,5);return page;}

首页，index.html 

index.html
查询所有的员工信息

employee_list.html

流水号
员工姓名
年龄
性别
邮箱
操作
删除修改

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