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Java框架 SSM整合

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  • Post category:java




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>
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:spring.xml</param-value>
	</context-param>

代码示例：

web.xml： 

<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: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>

	<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>
	<context-param>
		<param-name>contextConfigLocation</param-name>
		<param-value>classpath:spring.xml</param-value>
	</context-param>

spring.xml: 

	<context:component-scan base-package="com.chenyixin.ssm.service"/>

springmvc.xml: 

	<!--开启组件扫描-->
	<context:component-scan base-package="com.chenyixin.ssm.controller"/>

	<!-- 配置Thymeleaf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>

	<!-- 开启mvc注解驱动 -->
	<mvc:annotation-driven/>

	<!-- 配置视图控制器 -->
	<mvc:view-controller path="/" view-name="index"/>

创建 Service 层（除注解外，无代码内容）

创建 Controller 层 

@Controller
public class HelloController {

    @Autowired
    private HelloService helloService;
}

index.html: 

<head>
    <meta charset="UTF-8">
    <title>首页</title>
</head>
<body>
<h1>index.html</h1>
</body>


结果：运行服务器，正常运行

若将监听器注释掉，则服务器运行报错: 

	<!--<listener>-->
	<!--	&lt;!&ndash;-->
	<!--		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-->
	<!--	&ndash;&gt;-->
	<!--	<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>-->
	<!--</listener>-->
	<!--<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


略



② 导入依赖


    <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>

		<!-- Spring 持久化层支持jar包 -->
		<!--
		Spring 在执行持久化层操作、与持久化层技术进行整合过程中，
		需要使用orm、jdbc、tx三个 jar包
		-->
		<!-- 导入 orm 包就可以通过 Maven 的依赖传递性把其他两个也导入 -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-orm</artifactId>
			<version>5.3.1</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

INSERT INTO t_emp VALUES
(1001,'admin',20,'男','admin@qq.com'),
(NULL,'zhangsan',21,'女','zhangsan@qq.com'),
(NULL,'lisi',21,'女','lisi@qq.com'),
(NULL,'wangwu',21,'男','wangwu@qq.com'),
(NULL,'zaoliu',21,'男','zaoliu@qq.com'),
(NULL,'tianqi',22,'女','tianqi@qq.com'),
(NULL,'张三',21,'女','zhangsan@qq.com'),
(NULL,'李四',21,'女','lisi@qq.com'),
(NULL,'王五',21,'男','wangwu@qq.com'),
(NULL,'赵六',21,'男','zaoliu@qq.com'),
(NULL,'田七',22,'女','tianqi@qq.com'),
(NULL,'xioaming',22,'男','xioaming@qq.com'),
(NULL,'xiaohua',22,'男','xiaohua@qq.com'),
(NULL,'xiaozhang',22,'男','xiaozhang@qq.com'),
(NULL,'xiaowang',22,'男','xiaowang@qq.com'),
(NULL,'xiaofang',22,'女','xiaofang@qq.com'),
(NULL,'小明',22,'男','xioaming@qq.com'),
(NULL,'小华',22,'男','xiaohua@qq.com'),
(NULL,'小张',22,'男','xiaozhang@qq.com'),
(NULL,'小王',22,'男','xiaowang@qq.com'),
(NULL,'小芳',22,'女','xiaofang@qq.com')


④ 创建实体类Employee

package com.chenyixin.ssm.pojo;

public class Employee {
    private Integer empId;
    private String empName;
    private Integer age;
    private String sex;
    private String email;

    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 Employee() {
    }

    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;
    }

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



3、配置 xml 文件




3.1、配置 web.xml 文件


<!-- 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>
		<!-- 将 DispatcherServlet 的初始化时间提前到服务器启动时 -->
		<load-on-startup>1</load-on-startup>
	</servlet>
	<servlet-mapping>
		<servlet-name>DispatcherServlet</servlet-name>
		<url-pattern>/</url-pattern>
	</servlet-mapping>

	<!-- 配置Spring的监听器 -->
	<listener>
		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
	</listener>

	<!-- 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>


3.2、

创建SpringMVC的配置文件并配置


    <!--开启组件扫描-->
	<context:component-scan base-package="com.chenyixin.ssm.controller"/>

	<!-- 配置Thymeleaf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>
	<!-- 配置默认的servlet处理静态资源 -->
	<mvc:default-servlet-handler/>

	<!-- 开启 mvc 注解驱动 -->
	<mvc:annotation-driven/>

	<!-- 配置访问首页的视图控制 -->
	<mvc:view-controller path="/" view-name="index"/>


3.3、

创建Spring的配置文件并配置


	<!-- 组件扫描(除控制层) -->
	<context:component-scan base-package="com.chenyixin.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"/>

	<!-- 配置Druid数据源 -->
	<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
		<property name="driverClassName" value="${jdbc.driver}"/>
		<property name="url" value="${jdbc.url}"/>
		<property name="username" value="${jdbc.username}"/>
		<property name="password" value="${jdbc.password}"/>
	</bean>

	<!-- 配置事务管理器 -->
	<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="dataSource"/>
	</bean>

	<!--
		开始事务驱动
		将使用注解 @Transaction 标识的方法或类中的多有方法进行事务管理
	-->
	<tx:annotation-driven transaction-manager="transactionManager"/>


4、

搭建MyBatis环境




① 创建属性文件jdbc.properties


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


② 在

Spring 的配置文件中添加 MyBatis 的配置


	<!-- 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"/>
		<!-- 设置数据源 -->
		<property name="dataSource" ref="dataSource"/>
		<!-- 设置类型别名所对应的包 -->
		<property name="typeAliasesPackage" value="com.chenyixin.ssm.pojo"/>
		<!--
			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
			(前提是设置了 mapper 接口的扫描配置 的 bean)
		-->
		<!--<property name="mapperLocations" value="mappers/*.xml"/>-->
	</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.chenyixin.ssm.mapper"/>
	</bean>



③ 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>
	<!--
		MyBatis核心配置文件中，标签的顺序：
		properties?,settings?,typeAliases?,typeHandlers?, objectFactory?,objectWrapperFactory?,
		reflectorFactory?, plugins?,environments?,databaseIdProvider?,mappers?
	 -->

	<!-- 将下滑线映射为驼峰 -->
	<settings>
		<setting name="mapUnderscoreToCamelCase" value="true"/>
	</settings>

	<plugins>
		<!--配置分页插件-->
		<plugin interceptor="com.github.pagehelper.PageInterceptor"></plugin>
	</plugins>

</configuration>


④

创建Mapper接口和映射文件



EmployeeMapper 接口：
 

public interface EmployeeMapper {
}


EmployeeMapper.xml 映射文件：
 

<?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.chenyixin.ssm.mapper.EmployeeMapper">

</mapper>



⑤ 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>


5、功能实现


5.1、功能清单


5.2、访问首页


创建 index.html:
 

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8">
    <title>首页</title>
</head>
<body>
<h1>index.html</h1>
<a th:href="@{/employee}">员工信息列表</a>
</body>
</html>


5.3、查询全部数据(含分页功能)


① Java 代码



EmployeeController :

 

@Controller
public class EmployeeController {

    @Autowired
    private EmployeeService employeeService;

    @GetMapping("/employee/page/{pageNum}")
    public String getAllEmployee(Model model,@PathVariable("pageNum") Integer pageNum) {
        PageInfo<Employee> page = employeeService.getAllEmployee(pageNum);
        model.addAttribute("page", page);
        return "employee_list";
    }
}


EmployeeService :
 

public interface EmployeeService {
    /**
     * 查询所有员工信息
     * @return List<Employee>
     */
    PageInfo<Employee> getAllEmployee(Integer pageNum);
}


EmployeeServiceImpl
 

@Service
@Transactional
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    @Override
    public PageInfo<Employee> getAllEmployee(Integer pageNum) {
        // 开启分页功能，并传入 当前页面，和每页显示的条数
        PageHelper.startPage(pageNum,4);
        List<Employee> list = employeeMapper.selectAllEmployee();
        // 创建 PageInfo ,传入 list 和 导航分页的页码数
        return new PageInfo<>(list, 5);
    }
}


EmployeeMapper
 

public interface EmployeeMapper {

    /**
     * 查询所有员工信息
     * @return List<Employee>
     */
    List<Employee> selectAllEmployee();
}


② Mybaits 代码

<mapper namespace="com.chenyixin.ssm.mapper.EmployeeMapper">
	<!--List<Employee> selectAllEmployee();-->
	<select id="selectAllEmployee" resultType="employee">
		select * from t_emp
	</select>
</mapper>


③ employee_list.html

<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<link rel="stylesheet" th:href="@{/static/css/index_work.css}">
<head>
    <meta charset="UTF-8">
    <title>员工信息表</title>
</head>
<body>
<table>
    <tr>
        <th colspan="6">员工信息</th>
    </tr>
    <tr>
        <th>流水号</th>
        <th>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: ${page.list}">
        <td th:text="${status.count}"></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>删除</a>
            <a>修改</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}" style="color: orangered" 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>

            <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>


5.4 删除功能



① 修改employee_list.html，并添加事件


<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<link rel="stylesheet" th:href="@{/static/css/index_work.css}">
<head>
    <meta charset="UTF-8">
    <title>员工信息表</title>
</head>
<body>
<table id="dataTable">
    <tr>
        <th colspan="6">员工信息</th>
    </tr>
    <tr>
        <th>流水号</th>
        <th>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: ${page.list}">
        <td th:text="${status.count}"></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 @click="deleteEmployee" th:href="@{'/employee/'+${employee.empId}}">删除</a>
            <a>修改</a>
        </td>
    </tr>
    <tr>
        <td colspan="6">
            <span th:if="${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}" style="color: orangered" 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>

            <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>
        <td>
            <!-- 作用：通过超链接控制表单的提交，将post请求转换为delete请求 -->
            <form id="delete_form" method="post">
                <!-- HiddenHttpMethodFilter要求：必须传输_method请求参数，并且值为最终的请求方式 -->
                <input type="hidden" name="_method" value="delete"/>
            </form>
        </td>
    </tr>
</table>

<!-- 引入vue -->
<script type="text/javascript" th:src="@{/static/js/vue.js}"></script>
<script type="text/javascript">
    var vue = new Vue({
        el: "#dataTable",
        methods: {
            // event 表示当前事件
            deleteEmployee: function (event) {
                // 通过 id 获取表单标签
                var delete_form = document.getElementById("delete_form");
                // 将触发事件的超链接的 href 属性为表单的 action 属性赋值
                delete_form.action = event.target.href;
                // 提交表单
                delete_form.submit();
                // 阻止超链接的默认跳转行为
                event.preventDefault();
            }
        }
    });
</script>
</body>
</html>


②

控制器方法


    @DeleteMapping("/employee/{id}")
    public String deleteEmployeeById(@PathVariable Integer id, @RequestHeader("Referer") String referer) {
        employeeService.deleteEmployeeById(id);
        return "redirect:" + referer;
    }


5.5 添加员工信息功能


① 修改

employee_list.html




作用：跳转到添加数据页面


②

创建employee_add.html


<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<link rel="stylesheet" th:href="@{/static/css/index_work.css}">
<head>
    <meta charset="UTF-8">
    <title>添加员工信息</title>
</head>
<body>
<form th:action="@{/employee}" method="post">
    <table id="dataTable">
        <tr>
            <th colspan="2">添加员工信息</th>
        </tr>
        <tr>
            <td>姓名</td>
            <td>
                <input type="text" name="empName"/>
            </td>
        </tr>
        <tr>
            <td>年龄</td>
            <td>
                <input type="text" name="age" />
            </td>
        </tr>
        <tr>
            <td>性别</td>
            <td>
                <input type="text" name="sex">
            </td>
        </tr>
        <tr>
            <td>邮箱</td>
            <td>
                <input type="text" name="email" >
            </td>
        </tr>
        <tr>
            <th colspan="2">
                <input type="submit" value="添加">
                &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                <input type="reset" value="重置">
            </th>
        </tr>
    </table>
</form>
</body>
</html>


③ 控制器方法

    @RequestMapping("/employee/to/add")
    public String toADD(@RequestHeader("Referer") String referer) {
        this.referer = referer;
        return "employee_add";
    }
    @PostMapping("/employee")
    public String addEmployee(Employee employee) {
        employeeService.addEmployee(employee);
        return "redirect:"+referer;
    }


④ 添加方法


EmployeeService 接口：
 

    /**
     * 添加用户信息
     * @param employee
     */
    void addEmployee(Employee employee);


EmployeeServiceImpl 实现类：
 

    @Override
    public void addEmployee(Employee employee) {
        employeeMapper.insertEmployee(employee);
    }


EmployeeMapper 接口：
 

    /**
     * 添加用户信息
     * @param employee
     */
    void insertEmployee(Employee employee);


EmployeeMapper.xml 配置文件：
 

	<!--void insertEmployee(Employee employee);-->
	<insert id="insertEmployee">
		insert into t_emp values(null,#{empName},#{age},#{sex},#{email})
	</insert>


5.6 更新员工数据功能



① 修改超链接



②

创建employee_update.html


<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<link rel="stylesheet" th:href="@{/static/css/index_work.css}">
<head>
    <meta charset="UTF-8">
    <title>修改员工信息</title>
</head>
<body>
<form th:action="@{/employee}" method="post">
    <input type="hidden" name="_method" value="put">
    <input type="hidden" name="empId" th:value="${employee.empId}">
    <table id="dataTable">
        <tr>
            <th colspan="2">修改员工信息</th>
        </tr>
        <tr>
            <td>姓名</td>
            <td>
                <input type="text" name="empName" th:value="${employee.empName}"/>
            </td>
        </tr>
        <tr>
            <td>年龄</td>
            <td>
                <input type="text" name="age" th:value="${employee.age}"/>
            </td>
        </tr>
        <tr>
            <td>性别</td>
            <td>
                <input type="radio" name="sex" value="男" th:field="${employee.sex}">男
                <input type="radio" name="sex" value="女" th:field="${employee.sex}">女
            </td>
        </tr>
        <tr>
            <td>邮箱</td>
            <td>
                <input type="text" name="email" th:value="${employee.email}">
            </td>
        </tr>
        <tr>
            <th colspan="2">
                <input type="submit" value="修改">
                &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
                <input type="reset" value="重置">
            </th>
        </tr>
    </table>
</form>
</body>
</html>


③

控制器方法


    @GetMapping("/employee/{id}")
    public String toUpdate(@RequestHeader("Referer") String referer, @PathVariable Integer id, Model model) {
        Employee employee = employeeService.getEmployeeById(id);
        model.addAttribute("employee", employee);
        this.referer = referer;
        return "employee_update";
    }

    @PutMapping("/employee")
    public String UpdateEmployee(Employee employee) {
        employeeService.updateEmployee(employee);
        return "redirect:" + referer;
    }



④ 修改方法



EmployeeService 接口：
 

    /**
     * 根据 id 查询员工信息
     * @param id
     */
    Employee getEmployeeById(Integer id);

    /**
     * 修改用户信息
     * @param employee
     */
    void updateEmployee(Employee employee);


EmployeeServiceImpl 实现类：
 

    @Override
    public Employee getEmployeeById(Integer id) {
        return employeeMapper.selectEmployeeById(id);
    }

    @Override
    public void updateEmployee(Employee employee) {
        employeeMapper.updateEmployee(employee);
    }


EmployeeMapper 接口：
 

    /**
     * 根据 id 查询员工信息
     * @param id
     */
    Employee selectEmployeeById(Integer id);

    /**
     * 修改用户信息
     * @param employee
     */
    void updateEmployee(Employee employee);


EmployeeMapper.xml 配置文件：
 

	<!--void selectEmployeeById(Integer id);-->
	<select id="selectEmployeeById" resultType="employee">
		select *
		from t_emp
		where emp_id = #{id}
	</select>

	<!--void updateEmployee(Employee employee);-->
	<update id="updateEmployee">
		update t_emp
		set emp_name = #{empName},
			age      = #{age},
			sex      = #{sex},
			email    = #{email}
		where emp_id = #{empId}
	</update>


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