SSM简易版

技术准备

• Java：

　　基础知识

• 框架：　

　　Spring，SpringMVC，Mybatis　

• 数据库：

　　Mysq

• 开发工具：

　　Eclipse，Maven

项目结构

数据库设计

　　

　　

• 创建数据库：student

SET NAMES utf8mb4;
SET FOREIGN_KEY_CHECKS = 0;

-- ----------------------------
-- Table structure for student
-- ----------------------------
DROP TABLE IF EXISTS `student`;
CREATE TABLE `student`  (
  `id` int(11) NOT NULL,
  `studentName` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `studentSex` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `studentAge` int(255) NULL DEFAULT NULL,
  `school` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  `className` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Dynamic;

-- ----------------------------
-- Records of student
-- ----------------------------
INSERT INTO `student` VALUES (1, '小明', '男', 14, '第一中学', '高三1班');
INSERT INTO `student` VALUES (2, '小红', '女', 15, '第一中学', '高三2班');
INSERT INTO `student` VALUES (3, '小黄', '女', 14, '第一中学', '高三1班');
INSERT INTO `student` VALUES (4, '小蓝', '男', 14, '第一中学', '高三2班');

SET FOREIGN_KEY_CHECKS = 1;

依赖引入

• pom.xml文件

<dependencies>
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.6</version>
        </dependency>

        <!-- commons Start -->
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.5</version>
        </dependency>
        <!-- 文件上传支持(commons-io) -->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.3</version>
        </dependency>

        <!-- Logback相关依赖 Start(slf4j-api) -->
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-core</artifactId>
            <version>1.2.3</version>
        </dependency>
        <dependency>
            <groupId>ch.qos.logback</groupId>
            <artifactId>logback-classic</artifactId>
            <version>1.2.3</version>
        </dependency>
        <!-- Logback相关依赖 Ends -->

        <!-- Fastjson -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.46</version>
        </dependency>

        <!-- Spring相关依赖 Start -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jcl</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>5.0.5.RELEASE</version>
        </dependency>
        <!-- Spring相关依赖 Ends -->

        <!-- Druid(数据库连接池) -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.6</version>
        </dependency>

        <!-- MyBatis相关依赖 Start -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.5</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.1</version>
        </dependency>
        <!-- MyBatis相关依赖 Ends -->

        <!-- jstl -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
            <version>1.2</version>
        </dependency>

        <!-- servlet-api -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>4.0.0</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.47</version>
        </dependency>

</dependencies>

配置文件

• config.properties（数据库连接配置）

# 配置说明
#     driverClassName    : 数据库驱动的名称
#     url                : 数据库的地址
#     username        : 用户名
#     password        : 密码
#     maxActive        : 最大激活连接数
#     initialSize        : 连接池启动时创建的初始化连接数量
jdbc.mysql.driverClassName=com.mysql.jdbc.Driver
jdbc.mysql.url=jdbc:mysql:///shiro?useUnicode=true&characterEncoding=utf8
jdbc.mysql.username=root
jdbc.mysql.password=root
jdbc.mysql.maxActive=20
jdbc.mysql.initialSize=5

• applicationContext.xml（Spring配置）

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:aop="http://www.springframework.org/schema/aop"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:util="http://www.springframework.org/schema/util"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:task="http://www.springframework.org/schema/task"
    xmlns:cache="http://www.springframework.org/schema/cache"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/util
        http://www.springframework.org/schema/util/spring-util.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
        http://www.springframework.org/schema/task
        http://www.springframework.org/schema/task/spring-task.xsd
        http://www.springframework.org/schema/cache
        http://www.springframework.org/schema/cache/spring-cache.xsd">

    <!-- 加载相关资源文件 -->
    <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
                <value>classpath:config.properties</value>
            </list>
        </property>
        <property name="fileEncoding" value="UTF-8"></property>
    </bean>

    <!-- 开启注解扫描 -->
    <context:annotation-config/>

    <!-- 自动扫描的包名 -->
    <context:component-scan base-package="org.zyu">
        <!-- 不控制 Controller注解,即与 Controller分离 -->
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

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

    <!-- SqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!-- 数据库连接池 -->
        <property name="dataSource" ref="dataSource"/>
        <!-- 加载MyBatis的全局配置文件 -->
        <property name="mapperLocations">
            <list>
                <value>classpath*:**/dao/**/*Mapper.xml</value>
            </list>
        </property>
    </bean>

    <!-- Mapper扫描器 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!-- 扫描包路径,如果需要扫描多个包,中间使用半角逗号隔开 -->
        <!-- 对**.dao包内进行扫描 -->
        <property name="basePackage" value="**.dao"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>

    <!-- 事务管理器,对MyBatis操作数据库事务控制,Spring使用jdbc的事务控制类 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager" scope="singleton">
        <!-- 数据源dataSource在applicationContext-mybatis.xml中配置了 -->
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!-- 注解的事务管理@Transactional -->
    <tx:annotation-driven transaction-manager="transactionManager" proxy-target-class="true"/>

</beans>

• springMVC-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:util="http://www.springframework.org/schema/util"
    xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:task="http://www.springframework.org/schema/task"
    xmlns:cache="http://www.springframework.org/schema/cache"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/util
        http://www.springframework.org/schema/util/spring-util.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
        http://www.springframework.org/schema/aop
        http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
        http://www.springframework.org/schema/task
        http://www.springframework.org/schema/task/spring-task.xsd
        http://www.springframework.org/schema/cache
        http://www.springframework.org/schema/cache/spring-cache.xsd">

    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
        <!-- @ResponseBody返回JSON数据中文乱码解决,注意,此配置一定要在<mvc:annotation-driven/>配置前面 -->
        <property name="messageConverters">
            <list>
                <bean class="com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter">
                    <property name="supportedMediaTypes">
                        <list>
                            <value>text/html;charset=UTF-8</value>
                            <value>application/json;charset=UTF-8</value>
                        </list>
                    </property>
                </bean>
                <bean class="org.springframework.http.converter.StringHttpMessageConverter">
                    <property name="supportedMediaTypes">
                        <list>
                            <value>text/html;charset=UTF-8</value>
                        </list>
                    </property>
                </bean>
            </list>
        </property>
    </bean>

    <!-- 静态资源映射(通用) -->
    <mvc:resources mapping="/css/**" location="/WEB-INF/css/" />
    <mvc:resources mapping="/js/**" location="/WEB-INF/js/" />
    <mvc:resources mapping="/img/**" location="/WEB-INF/img/" />
    <mvc:resources mapping="/3rd/**" location="/WEB-INF/3rd/" />

    <!-- 当上面要访问的静态资源不包括在上面的配置中时,则根据此配置来访问 -->
    <mvc:default-servlet-handler />

    <!-- 默认的注解映射的支持 -->
    <mvc:annotation-driven />

    <!-- 开启Controller注解支持 -->
    <!-- use-default-filters="false"只扫描指定的注解 -->
    <context:component-scan base-package="**.controller">
        <!-- 不控制 Service 注解的事务.即与Service事务分离 -->
        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service" />
    </context:component-scan>

    <!-- SpringMVC上传文件时,需配置MultipartResolver处理器 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>

    <!-- 视图解析器 -->
    <bean id="jspViewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
        <property name="prefix" value="/WEB-INF/views/" />
        <property name="suffix" value=".jsp" />
    </bean>

    <!-- 拦截器配置 -->
    <mvc:interceptors>
        <!-- 可配多个拦截器,顺序执行 -->
        <mvc:interceptor>
            <!-- [/**]表示所有url包括子url路径 -->
            <mvc:mapping path="/**"/>
            <!-- 不拦截静态资源路径下的请求 -->
            <mvc:exclude-mapping path="/css/**"/>
            <mvc:exclude-mapping path="/fonts/**"/>
            <mvc:exclude-mapping path="/img/**"/>
            <mvc:exclude-mapping path="/js/**"/>
            <mvc:exclude-mapping path="/plugins/**"/>
            <mvc:exclude-mapping path="/upload/**"/>
            <bean class="org.zyu.intercepter.BaseHandlerInterceptor"/>
        </mvc:interceptor>
    </mvc:interceptors>

</beans>

• logback.xml（打印日志信息）

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
    <!-- 基本信息配置 -->
    <property name="localAppName"     value="org.xujun"/>
    <property name="logHomeDir"     value="${user.dir}/logs/logback"/>
    <property name="logbackLevel"     value="DEBUG"/>
    <contextName>default</contextName>

    <!-- 控制台输出配置 -->
    <appender name="ConsoleAppender" class="ch.qos.logback.core.ConsoleAppender">
        <target>System.out</target>
        <encoder>
            <pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg %n</pattern>
        </encoder>
    </appender>

    <!-- 针对本项目配置的日志 Start -->
    <appender name="LOCALAPP_DEBUG" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <Encoding>UTF-8</Encoding>
        <Prudent>false</Prudent>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>DEBUG</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>${logHomeDir}/${localAppName}/debug/debug-%d{yyyy-MM-dd}.log</FileNamePattern>
            <MaxHistory>10</MaxHistory> <!-- 日志保留的个数 -->
        </rollingPolicy>
        <layout class="ch.qos.logback.classic.PatternLayout">
            <Pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</Pattern>
        </layout>
    </appender>

    <appender name="LOCALAPP_WARN" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <Encoding>UTF-8</Encoding>
        <Prudent>false</Prudent>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>WARN</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>${logHomeDir}/${localAppName}/warn/warn-%d{yyyy-MM-dd}.log</FileNamePattern>
            <MaxHistory>10</MaxHistory> <!-- 日志保留的个数 -->
        </rollingPolicy>
        <layout class="ch.qos.logback.classic.PatternLayout">
            <Pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</Pattern>
        </layout>
    </appender>

    <appender name="LOCALAPP_INFO" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <Encoding>UTF-8</Encoding>
        <Prudent>false</Prudent>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>INFO</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>${logHomeDir}/${localAppName}/info/info-%d{yyyy-MM-dd}.log</FileNamePattern>
            <MaxHistory>10</MaxHistory> <!-- 日志保留的个数 -->
        </rollingPolicy>
        <layout class="ch.qos.logback.classic.PatternLayout">
            <Pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</Pattern>
        </layout>
    </appender>

    <appender name="LOCALAPP_ERROR" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <Encoding>UTF-8</Encoding>
        <Prudent>false</Prudent>
        <filter class="ch.qos.logback.classic.filter.LevelFilter">
            <level>ERROR</level>
            <onMatch>ACCEPT</onMatch>
            <onMismatch>DENY</onMismatch>
        </filter>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>${logHomeDir}/${localAppName}/error/error-%d{yyyy-MM-dd}.log</FileNamePattern>
            <MaxHistory>10</MaxHistory> <!-- 日志保留的个数 -->
        </rollingPolicy>
        <layout class="ch.qos.logback.classic.PatternLayout">
            <Pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</Pattern>
        </layout>
    </appender>
    <!-- 针对本项目配置的日志 Ends -->

    <!-- 针对第三方配置的日志 Start -->
    <appender name="THIRDPART_DEFAULT" class="ch.qos.logback.core.rolling.RollingFileAppender">
        <Encoding>UTF-8</Encoding>
        <Prudent>false</Prudent>
        <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy">
            <FileNamePattern>${logHomeDir}/${localAppName}/thirdpart/thirdpart-%d{yyyy-MM-dd}.log</FileNamePattern>
            <MaxHistory>10</MaxHistory> <!-- 日志保留的个数 -->
        </rollingPolicy>
        <layout class="ch.qos.logback.classic.PatternLayout">
            <Pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</Pattern>
        </layout>
    </appender>
    <!-- 针对第三方配置的日志 Ends -->

    <!-- 针对指定包配置的日志 Start -->
    <logger name="test" addtivity="false" level="${logbackLevel}">
        <appender-ref ref="ConsoleAppender"/>
    </logger>

    <logger name="org" addtivity="false" level="${logbackLevel}">
        <appender-ref ref="ConsoleAppender"/>
        <appender-ref ref="THIRDPART_DEFAULT"/>
    </logger>

    <logger name="com" addtivity="false" level="${logbackLevel}">
        <appender-ref ref="ConsoleAppender"/>
        <appender-ref ref="THIRDPART_DEFAULT"/>
    </logger>

    <!-- log4jdbc 专用配置 -->
    <logger name="jdbc.sqltiming" addtivity="false" level="${logbackLevel}">
        <appender-ref ref="ConsoleAppender"/>
    </logger>

    <logger name="jdbc.resultsettable" level="INFO"></logger>
    <logger name="jdbc.sqlonly" level="OFF"></logger>
    <logger name="jdbc.audit" level="OFF"></logger>
    <logger name="jdbc.resultset" level="OFF"></logger>
    <logger name="jdbc.connection" level="OFF"></logger>
    <!-- 针对指定包配置的日志 Ends -->

    <!-- 根logger<root>此标签必须设置在最后面方可正常读取,否则系统将识别为无输出控制.
         只有一个level属性,用来设置打印级别,大小写无关:TRACE, DEBUG, INFO, WARN, ERROR, ALL 和 OFF,
         不能设置为INHERITED或者同义词NULL. 默认是DEBUG. <root>可以包含零个或多个<appender-ref>元素,标识这个appender将会添加到这个loger. -->
    <root level="WARN">
        <!-- <appender-ref ref="ConsoleAppender"/> -->
    </root>

</configuration>

• web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">

    <!-- Spring的配置 Start -->
    <context-param>
        <description>配置spring读取的xml文件,param-name是spring规定,spring自动加载以下内容.</description>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>
    <!-- Spring的配置 Ends -->

    <!-- SpringMVC 配置 Start -->

    <!-- Web请求编码过滤器,POST中文乱码解决方案 -->
    <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>

    <!-- DispatcherServlet 配置加载 -->
    <servlet>
        <servlet-name>springMVC</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>
            <!-- 以下配置springmvc-servlet.xml放在包内或部署的classes目录下的对应目录下皆可. -->
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springMVC-servlet.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springMVC</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>

    <!-- SpringMVC 配置 Ends -->
    <session-config>
        <session-timeout>30</session-timeout>
    </session-config>
</web-app>

好了，基本配置完成，接下来开始写代码。

① 实体类设计

实体类的字段名需要和数据库的一一对应

• 在Package【org.zyu.bean】下创建Student类

package org.zyu.bean;

public class Student {

    private Integer id;
    private String studentName;
    private String studentSex;
    private Integer studentAge;
    private String school;
    private String className;

    public Student() {
    }

    public Student(Integer id, String studentName, String studentSex, Integer studentAge, String school,
            String className) {
        this.id = id;
        this.studentName = studentName;
        this.studentSex = studentSex;
        this.studentAge = studentAge;
        this.school = school;
        this.className = className;
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getStudentName() {
        return studentName;
    }

    public void setStudentName(String studentName) {
        this.studentName = studentName;
    }

    public String getStudentSex() {
        return studentSex;
    }

    public void setStudentSex(String studentSex) {
        this.studentSex = studentSex;
    }

    public Integer getStudentAge() {
        return studentAge;
    }

    public void setStudentAge(Integer studentAge) {
        this.studentAge = studentAge;
    }

    public String getSchool() {
        return school;
    }

    public void setSchool(String school) {
        this.school = school;
    }

    public String getClassName() {
        return className;
    }

    public void setClassName(String className) {
        this.className = className;
    }

    @Override
    public String toString() {
        StringBuilder builder = new StringBuilder();
        builder.append("Student [id=");
        builder.append(id);
        builder.append(", studentName=");
        builder.append(studentName);
        builder.append(", studentSex=");
        builder.append(studentSex);
        builder.append(", studentAge=");
        builder.append(studentAge);
        builder.append(", school=");
        builder.append(school);
        builder.append(", className=");
        builder.append(className);
        builder.append("]");
        return builder.toString();
    }

}

② DAO类设计

DAO，即 Date Access Object，数据库访问对象，就是对数据库相关操作的封装，让其他地方看不到 JDBC 的代码。

在【org.zyu.dao】下创建【StudentMapper】接口（注意：接口的方法名需要和映射文件的id一致）

package org.zyu.dao;

import java.util.List;

import org.zyu.bean.Student;

public interface StudentMapper {

    /**
     * 获取学生列表
     * @return List<Bean>
     */
    List<Student> getStudentList();

}

在【org.zyu.dao】下创建【StudentMapper.xml】映射文件（注意：namespace：对应接口的相对路径）

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"
"http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">
<mapper namespace="org.zyu.dao.StudentMapper">

    <!-- 查询学生列表 -->
    <select id="getStudentList" resultType="org.zyu.bean.Student">
        SELECT * FROM student
    </select>

</mapper>

③ 业务类设计

• 问题：为什么不直接使用 Dao 类而是还要在上面封装一层 Service 层呢？
• 回答：
  基于责任分离的原则，Dao 层就应该专注于对数据库的操作，而在 Service 层我们可以增加一些非 CRUD 的方法去更好的完成本身抽离出来的 service 服务（业务处理）。

在【org.zyu.service】包下创建【StudentService】接口：

package org.zyu.service;

import java.util.List;

import org.zyu.bean.Student;

public interface StudentService {
    /**
     * 获取所有学生列表
     * @return
     */
    List<Student> getStudentList();

}

在【org.zyu.service.impl】下创建【StudentServiceImpl】：

package org.zyu.service.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.zyu.bean.Student;
import org.zyu.dao.StudentMapper;
import org.zyu.service.StudentService;

@Service
public class StudentServiceImpl implements StudentService {

    @Autowired
    private StudentMapper mapper;

    public List<Student> getStudentList() {
        return mapper.getStudentList();
    }

}

④ 功能开发

在【org.zyu.controller】包下创建【StudentController】控制器：

package org.zyu.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.zyu.service.StudentService;

import com.alibaba.fastjson.JSONObject;

@Controller
public class StudentController {

    @Autowired
    public StudentService studentService;

    @RequestMapping("/showList")
    @ResponseBody
    public JSONObject getStudentList() {
        JSONObject data = new JSONObject();
        data.put("list", studentService.getStudentList());
        return data;
    }

}

运行项目。。。

输入网址：http://localhost:8080/java_Excel/showList

项目地址：https://pan.baidu.com/s/1mg9AZUzMVomqRxduCWNE0Q     密码：8z6j