【JavaEE】之SSM入门项目的搭建

最近学习了一下SSM。SSM是 Spring + SpringMVC + MyBatis 整合框架，非常适合WEB后台开发，也是当前很多人的不二选择。这篇博客带大家来创建一个学习SSM的入门程序，从搭建框架开始，到实现一个小功能，相信新手朋友们通过这篇博客就可以基本入门开发SSM了。

首先介绍一下本博客使用的开发环境的框架版本：

• 开发环境：IntelliJ IDEA 2016.3 + Tomcat 8.5.8 + Maven
• Spring（MVC）版本：4.3.4.RELEASE
• MyBatis版本：2.8.5

1、新建工程

首先打开IntelliJ IDEA开发工具，点击“Create New Project”，如下图所示：

点击后跳转到如下图所示的界面，选择“Empty Project”（如下图所示选择），然后点击“Next”按钮：

跳转到如下图所示的界面，在Project Name一栏中输入项目名称，然后点击Finish：

这时就进入项目了，但是仍然会弹出一个如下图所示的界面，在这个界面中点击图中所示的“加号”，在弹出的窗口中点击“New Module”：

由于我们是要搭建一个SSM的项目，因此我们参照下图所示的界面，一次选择“JAVA”、“Web Project”，然后点击“Next”按钮：

在弹出的界面中输入Module的名称，然后点击“Finish”按钮（IntelliJ、Android Studio这类开发工具与Eclipse不同，它们的Project相当于Eclipse中的WorkSpace，Module才相当于Eclipse中的Project，也就是说，在这类开发工具中，一个Project中可以包含多个Module）：

此时会返回上一个页面，如下图所示，可以看到，新的Module已经添加到项目中了，点击OK：

此时就正式进入到了项目中，现在项目的结构如下图所示：

由于我们的项目需要使用Maven进行版本控制，因此我们需要在项目中添加Maven。在项目名上右键选择“Add Framework Support”，如下图所示：

在弹出的页面中选择Maven，然后点击OK按钮，如下图所示：

此时会打开Maven的pom.xml文件，先在这个文件中指定项目的GroupId（一般是基本包名），然后点击右下角的“Import Changes Enable Auto-Import”。如下图所示：

等待项目加载完成，到此，我们的第一个SSM项目就搭建完成了，现在的项目文件体系架构如下图所示：

2、搭建项目框架

下图是一个基本的SSM项目的文件结构：

首先，我们需要在pom.xml中导入Maven依赖，pom.xml文件中的代码如下：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>my.itgungnir.ssm</groupId>
    <artifactId>SSMTemplate</artifactId>
    <version>1.0-SNAPSHOT</version>

    <!-- 避免Mapper.xml和Mapper.java绑定不成功 -->
    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                    <include>**/*.tld</include>
                    <include>**/*.jsp</include>
                </includes>
                <filtering>true</filtering>
            </resource>

            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.properties</include>
                    <include>**/*.xml</include>
                    <include>**/*.tld</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <spring.version>4.3.4.RELEASE</spring.version>
        <jackson.version>2.8.5</jackson.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>3.8.1</version>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>aopalliance</groupId>
            <artifactId>aopalliance</artifactId>
            <version>1.0</version>
        </dependency>

        <dependency>
            <groupId>asm</groupId>
            <artifactId>asm</artifactId>
            <version>3.3.1</version>
        </dependency>

        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
            <version>1.8.9</version>
        </dependency>

        <dependency>
            <groupId>org.bouncycastle</groupId>
            <artifactId>bcprov-ext-jdk15on</artifactId>
            <version>1.55</version>
        </dependency>

        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.18</version>
        </dependency>

        <dependency>
            <groupId>cglib</groupId>
            <artifactId>cglib</artifactId>
            <version>3.2.4</version>
        </dependency>

        <dependency>
            <groupId>cglib</groupId>
            <artifactId>cglib-nodep</artifactId>
            <version>3.2.4</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml</groupId>
            <artifactId>classmate</artifactId>
            <version>1.3.1</version>
        </dependency>

        <dependency>
            <groupId>commons-codec</groupId>
            <artifactId>commons-codec</artifactId>
            <version>1.10</version>
        </dependency>

        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>

        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>

        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>

        <dependency>
            <groupId>commons-logging</groupId>
            <artifactId>commons-logging</artifactId>
            <version>1.2</version>
        </dependency>

        <dependency>
            <groupId>commons-pool</groupId>
            <artifactId>commons-pool</artifactId>
            <version>1.6</version>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>5.2.4.Final</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-annotations</artifactId>
            <version>${jackson.version}</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>${jackson.version}</version>
        </dependency>

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>${jackson.version}</version>
        </dependency>

        <dependency>
            <groupId>org.javassist</groupId>
            <artifactId>javassist</artifactId>
            <version>3.21.0-GA</version>
        </dependency>

        <dependency>
            <groupId>javax</groupId>
            <artifactId>javaee-api</artifactId>
            <version>7.0</version>
        </dependency>

        <dependency>
            <groupId>org.jboss.logging</groupId>
            <artifactId>jboss-logging</artifactId>
            <version>3.3.0.Final</version>
        </dependency>

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

        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>

        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.7</version>
        </dependency>

        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.7</version>
        </dependency>

        <dependency>
            <groupId>javax.mail</groupId>
            <artifactId>mail</artifactId>
            <version>1.4.7</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.0</version>
        </dependency>

        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.0</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>6.0.5</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.21</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.21</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</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-beans</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</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-orm</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-oxm</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>

        <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>javax.validation</groupId>
            <artifactId>validation-api</artifactId>
            <version>1.1.0.Final</version>
        </dependency>
    </dependencies>
</project>

db.properties文件中存储的是数据库有关的数据，如数据库驱动器、用户名、密码等。代码如下：

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

log4j.properties文件中存储的是日志相关的参数，代码如下：

# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# MyBatis logging configuration...
log4j.logger.org.mybatis.example.BlogMapper=TRACE
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

sqlmap.xml文件中存储的是MyBatis中用到的参数，这里由于和Spring进行了整合，一些代码都转到Spring的配置文件中进行维护了，这个文件中只声明类的别名。代码如下：

<?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>
    <!-- 配置别名（批量扫描配置别名） -->
    <typeAliases>
        <package name="my.itgungnir.ssm.pojo"/>
    </typeAliases>
</configuration>

springconf-context.xml文件中存储的是Spring中的一些几乎不发生变化的参数，如数据库连接池、SqlSessionFactory、事务管理器、mapper批量扫描、AOP等等。代码如下：

<?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"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context.xsd
            http://www.springframework.org/schema/tx
            http://www.springframework.org/schema/tx/spring-tx.xsd
            http://www.springframework.org/schema/aop
            http://www.springframework.org/schema/aop/spring-aop.xsd">

    <!-- 加载数据库配置设置 -->
    <context:property-placeholder location="classpath:db.properties"/>

    <!-- Druid数据库连接池配置 -->
    <bean name="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="initialSize" value="1"/>
        <property name="maxActive" value="20"/>
        <property name="minIdle" value="0"/>
        <property name="maxWait" value="60000"/>
        <property name="poolPreparedStatements" value="true"/>
        <property name="maxPoolPreparedStatementPerConnectionSize" value="33"/>
        <property name="validationQuery" value="SELECT 'x' FROM DUAL"/>
        <property name="testOnBorrow" value="false"/>
        <property name="testOnReturn" value="false"/>
        <property name="testWhileIdle" value="true"/>
        <property name="timeBetweenEvictionRunsMillis" value="60000"/>
        <property name="minEvictableIdleTimeMillis" value="25200000"/>
        <property name="removeAbandoned" value="true"/>
        <property name="removeAbandonedTimeout" value="1800"/>
        <property name="logAbandoned" value="true"/>
        <property name="filters" value="mergeStat"/>
    </bean>

    <!-- 配置SqlSessionFactory -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="configLocation" value="classpath:mybatis/sqlmap.xml"/>
    </bean>

    <!-- mapper批量扫描 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="my.itgungnir.ssm.mappers"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>

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

    <!-- 通知 -->
    <tx:advice id="txAdvice" transaction-manager="transactionManager">
        <tx:attributes>
            <tx:method name="save*" propagation="REQUIRED"/>
            <tx:method name="delete*" propagation="REQUIRED"/>
            <tx:method name="insert*" propagation="REQUIRED"/>
            <tx:method name="update*" propagation="REQUIRED"/>
            <tx:method name="find*" propagation="SUPPORTS" read-only="true"/>
            <tx:method name="get*" propagation="SUPPORTS" read-only="true"/>
            <tx:method name="select*" propagation="SUPPORTS" read-only="true"/>
        </tx:attributes>
    </tx:advice>

    <!-- AOP -->
    <aop:config>
        <aop:advisor advice-ref="txAdvice" pointcut="execution(* my.itgungnir.ssm.service.impl.*.*(..))"/>
    </aop:config>

</beans>

springconf-service.xml文件中存储的是对Service接口的实现类的管理，即Service实现类的BEAN容器。代码如下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans.xsd">
    <!-- 操作用户信息的Service实现类 -->
    <bean id="usersService" class="my.itgungnir.ssm.service.impl.UsersServiceImpl"/>
</beans>

springmvc.xml文件中存储的是SpringMVC中用到的一些组件，如处理器映射器、处理器适配器、试图解析器、文件上传的解析器、处理器全局扫描等。代码如下：

<?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:mvc="http://www.springframework.org/schema/mvc"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans.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">

    <!-- 全局扫描Handler -->
    <context:component-scan base-package="my.itgungnir.ssm.controller"/>

    <!-- 处理器映射器和适配器 -->
    <mvc:annotation-driven/>

    <!-- 视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/> <!-- 前缀 -->
        <property name="suffix" value=".jsp"/> <!-- 后缀 -->
    </bean>

    <!-- 文件上传解析器 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="5242880"/>
    </bean>
</beans>

web.xml中的代码如下：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">

    <display-name>ONE</display-name>

    <!-- 加载spring容器 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <!--  /WEB-INF/classes/spring/applicationContext-*.xml这里的路径设置是怎么回事-->
        <param-value>/WEB-INF/classes/spring/springconf-context.xml</param-value>
    </context-param>

    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- springmvc前端控制器 -->
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- contextConfigLocation配置springmvc加载的配置文件（配置处理器映射器、适配器等等） -->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring/springmvc.xml</param-value>
        </init-param>
        <!-- <load-on-startup>1</load-on-startup> -->
    </servlet>

    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>*.action</url-pattern>
    </servlet-mapping>

    <!--配置Druid数据库连接池的内置监控  -->
    <servlet>
        <servlet-name>DruidStatView</servlet-name>
        <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>DruidStatView</servlet-name>
        <url-pattern>/druid/*</url-pattern>
    </servlet-mapping>

    <!-- post乱码过虑器 -->
    <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>
    </filter>
    <filter-mapping>
        <filter-name>CharacterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--设置session存活时间  -->
    <session-config>
        <session-timeout>60</session-timeout>
    </session-config>

    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.htm</welcome-file>
        <welcome-file>index.jsp</welcome-file>
        <welcome-file>default.html</welcome-file>
        <welcome-file>default.htm</welcome-file>
        <welcome-file>default.jsp</welcome-file>
    </welcome-file-list>

</web-app>

Users.java文件是数据库中的users表映射而成的实体类，代码如下：

import java.util.Date;

/**
 * Users数据表映射成的POJO类
 */
public class Users {
    private Integer id;
    private String username;
    private Date birthday;
    private Character sex;
    private String address;

    public Users() {
    }

    public Users(String username, Date birthday, Character sex, String address) {
        this.username = username;
        this.birthday = birthday;
        this.sex = sex;
        this.address = address;
    }

    public Users(Integer id, String username, Date birthday, Character sex, String address) {
        this.id = id;
        this.username = username;
        this.birthday = birthday;
        this.sex = sex;
        this.address = address;
    }

    public Integer getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public Character getSex() {
        return sex;
    }

    public void setSex(Character sex) {
        this.sex = sex;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }
}

UsersMapper.xml类中存储的是从数据库中读取数据的SQL语句。代码如下：

<?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="my.itgungnir.ssm.mappers.UsersMapper">
    <!-- 查询所有用户 -->
    <select id="selectAllUsers" resultType="my.itgungnir.ssm.Users">
        SELECT * FROM users
    </select>
</mapper>

UsersMapper.java类是与XML文件对应的Mapper接口，其路径与XML的namespace相同。代码如下：

import pojo.Users;

import java.util.List;

/**
 * Users表的Mapper接口
 */
public interface UsersMapper {
    // 查询所有用户
    List<Users> selectAllUsers() throws Exception;
}

UsersService.java类是Service接口，代码如下：

import pojo.Users;

import java.util.List;

/**
 * 映射到Users表的Service接口
 */
public interface UsersService {
    // 查询所有用户
    List<Users> selectAllUsers() throws Exception;
}

UsersServiceImpl.java类是Service接口的实现类，其中持有一个UsersMapper的引用，通过mapper来处理得到数据。代码如下：

import mapper.UsersMapper;
import org.springframework.beans.factory.annotation.Autowired;
import pojo.Users;
import service.UsersService;

import java.util.List;

/**
 * UsersService接口的实现类
 */
public class UsersServiceImpl implements UsersService {
    @Autowired
    private UsersMapper mapper;

    // 查询所有用户
    public List<Users> selectAllUsers() throws Exception {
        return mapper.selectAllUsers();
    }
}

UsersController.java类是处理器类，通过service接口的动态代理来获取数据，并负责界面的跳转。代码如下：

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import pojo.Users;
import service.UsersService;

import java.util.List;

/**
 * Users的Controller
 */
@Controller public class UsersController {
    @Autowired
    private UsersService service;

    @RequestMapping("selectAllUsers.action")
    public String selectAllUsers(Model model) throws Exception {
        List<Users> users = service.selectAllUsers();
        model.addAttribute("users", users);
        return "users/allusers";
    }
}

allusers.jsp页面中负责从Controller中得到数据并展示。代码如下：

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>所有用户</title>
</head>
<body>
<form action="" method="post">
    <table width="100%" border="1">
        <tr>
            <td>姓名</td>
            <td>出生日期</td>
            <td>性别</td>
            <td>地址</td>
        </tr>
        <c:forEach items="${users}" var="user">
            <tr>
                <td>${user.username}</td>
                <td>${user.birthday}</td>
                <td>${user.sex}</td>
                <td>${user.address}</td>
            </tr>
        </c:forEach>
    </table>
</form>
</body>
</html>

3、搭建服务器

我们使用的是Tomcat服务器。如果还没有给项目配置Tomcat服务器，那么是不能运行的，如下图所示，运行按钮是置灰的：

此时，我们需要按照下图所示的步骤，点击下拉三角并点击“Edit Configureations”：

跳转到下图所示的界面，按照下图所示的指示，依次点击加号、“Tomcat Server”、“Local”：

点击了“Local”之后，界面会变成如下图所示的样子，我们可以修改服务器名称、JRE版本；如果下面提示“No artifacts marked for deployment”，则点击右侧的“Fix”按钮即可解决问题。最后点击OK按钮：

完成之后，可以看到程序已经可以运行，并且已经选中了一个服务器，如下图所示：

我们可以通过点击上图中的Run或Debug运行程序，运行起来之后，在浏览器的地址栏中输入如下URL，回车运行：

http://localhost:8080/selectAllUsers.action

运行结果如下图所示：

至此，我们的第一个SSM的项目就全部完成啦！希望对大家有帮助~

　　最后的最后贴出这个项目的【GitHub地址】。