利用maven搭建ssm框架，干货

1.所需环境

IDE：IDEA，JDK版本：1.8，数据库：mysql5.7 　　启动方式：tomcat

2.搭建项目

2.1

2.2

2.3

完整目录结构：

3.导入依赖

下面是需要在pom.xml文件中添加的依赖：

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <maven.compiler.source>1.7</maven.compiler.source>
    <maven.compiler.target>1.7</maven.compiler.target>
    <!-- 定义版本号 -->
    <junit.version>4.12</junit.version>
    <spring.version>4.1.3.RELEASE</spring.version>
    <mybatis.version>3.2.8</mybatis.version>
    <mybatis.spring.version>1.2.2</mybatis.spring.version>
    <mysql.version>5.1.32</mysql.version>
    <slf4j.version>1.6.4</slf4j.version>
    <jackson.version>2.4.2</jackson.version>
    <druid.version>1.0.9</druid.version>
    <jstl.version>1.2</jstl.version>
    <servlet-api.version>2.5</servlet-api.version>
    <jsp-api.version>2.0</jsp-api.version>
    <commons-lang3.version>3.3.2</commons-lang3.version>
    <jsqlparser.version>0.9.1</jsqlparser.version>
  </properties>
  <!-- 导入jar包 -->
  <dependencies>
    <!-- Apache工具组件 -->
    <dependency>
      <groupId>org.apache.commons</groupId>
      <artifactId>commons-lang3</artifactId>
      <version>${commons-lang3.version}</version>
    </dependency>
    <!-- Jackson Json处理工具包 -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>${jackson.version}</version>
    </dependency>
    <!-- 单元测试 -->
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>${junit.version}</version>
    </dependency>
    <!-- 日志处理 -->
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>${slf4j.version}</version>
    </dependency>
    <!-- Mybatis -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>${mybatis.spring.version}</version>
    </dependency>
    <!-- MySql -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>${mysql.version}</version>
    </dependency>
    <!-- 连接池 -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>${druid.version}</version>
    </dependency>
    <!-- Spring -->
    <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>
    <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>${spring.version}</version>
    </dependency>
    <!-- JSP相关 -->
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>${jstl.version}</version>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>${servlet-api.version}</version>
      <scope>provided</scope>
    </dependency>
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jsp-api</artifactId>
      <version>${jsp-api.version}</version>
      <scope>provided</scope>
    </dependency>
  </dependencies>

  <build>
    <resources>
      <!-- 这个配置时告诉maven在做资源拷贝的时候(拷贝到target目录下)把src/main/java的properties和xml文件也都拷贝过去 -->
      <resource>
        <directory>src/main/java</directory>
        <includes>
          <include>**/*.properties</include>
          <include>**/*.xml</include>
        </includes>
        <filtering>false</filtering>
      </resource>
      <!-- 将项目中的resources目录下的配置文件拷贝到taget目录下 如果不添加此节点resources目录下的配置文件都会被漏掉。-->
      <resource>
        <directory>src/main/resources</directory>
        <includes>
          <include>**/*.properties</include>
          <include>**/*.xml</include>
        </includes>
        <filtering>false</filtering>
      </resource>
    </resources>
  </build>

4.配置文件

4.1 db.properties是放置数据库以及数据池的数据：

driver=com.mysql.jdbc.Driver
#在和mysql传递数据的过程中，使用unicode编码格式，并且字符集设置为utf-8
url=jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=utf-8
user=root
password=root
#password=123456

minIdle=50
maxIdle=45
initialSize=5
maxActive=100
maxWait=100
removeAbandonedTimeout=180
removeAbandoned=true
timeBetweenEvictionRunsMillis=60000
testWhileIdle=true
testOnBorrow=false
testOnReturn=false

4.2log4j.properties是日志的相关配置：

# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# 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

4.3ApplicationContext.xml是Spring的配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:p="http://www.springframework.org/schema/p"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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-4.0.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-4.0.xsd
            http://www.springframework.org/schema/aop
            http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
            http://www.springframework.org/schema/tx
            http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
            http://www.springframework.org/schema/util
            http://www.springframework.org/schema/util/spring-util-4.0.xsd">

    <!--注解扫描-->
    <context:component-scan base-package="com.beixi.*"></context:component-scan>

    <!--数据源连接池-->
    <context:property-placeholder location="classpath:db.properties" />

    <!-- 数据库连接池 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
          destroy-method="close">
        <property name="url" value="${url}" />
        <property name="username" value="${user}" />
        <property name="password" value="${password}" />
        <property name="driverClassName" value="${driver}" />
        <property name="maxActive" value="10" />
        <property name="minIdle" value="5" />
    </bean>

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

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

    <!-- 配置通知 -->
    <tx:advice id="Advice" transaction-manager="transactionManager">
        <tx:attributes>
            <!-- 传播行为 -->
            <tx:method name="save*" propagation="REQUIRED" />
            <tx:method name="insert*" propagation="REQUIRED" />
            <tx:method name="add*" propagation="REQUIRED" />
            <tx:method name="create*" propagation="REQUIRED" />
            <tx:method name="delete*" propagation="REQUIRED" />
            <tx:method name="update*" propagation="REQUIRED" />
            <tx:method name="drop*" propagation="REQUIRED" />
            <tx:method name="modify*" propagation="REQUIRED" />
            <tx:method name="find*" propagation="SUPPORTS" read-only="true" />
            <tx:method name="select*" propagation="SUPPORTS" read-only="true" />
            <tx:method name="get*" propagation="SUPPORTS" read-only="true" />
        </tx:attributes>
    </tx:advice>

    <!-- 切面 -->
    <aop:config>
        <aop:advisor advice-ref="Advice" pointcut="execution(* com.beixi.service.*.*(..))" />
    </aop:config>
</beans>

4.4mybatis-config.xml是mybatis的配置文件：

<?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>
    <typeAliases>
        <package name="com.beixi.entity"/>
    </typeAliases>

    <mappers>
        <mapper resource="mappers/UserMapper.xml"/>
    </mappers>

</configuration>

4.5SpringMvc.xml是springmvc的配置文件：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<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">

    <!--开启注解驱动-->
    <context:component-scan base-package="com.beixi.*" />
    <mvc:annotation-driven />


    <!-- 静态资源映射 释放-->
    <mvc:resources mapping="/js/**" location="/WEB-INF/js/" />
    <mvc:resources mapping="/css/**" location="/WEB-INF/css/" />
    <mvc:resources mapping="/fonts/**" location="/WEB-INF/fonts/" />
    <mvc:resources mapping="/plugins/**" location="/WEB-INF/plugins/" />
    <mvc:resources mapping="images/**" location="/WEB-INF/images/" />

    <!-- 视图解析器  -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!--prefix和suffix：查找视图页面的前缀和后缀，比如传进来的逻辑视图名为hello，则该该jsp视图页面应该存放在“WEB-INF/hello.jsp”-->
        <property name="prefix" value="/WEB-INF/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

</beans>

4.6接下来是web.xml的全局配置：

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


  <!-- 加载spring容器 -->
  <context-param>
    <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>



  <!-- springmvc前端控制器 -->
  <servlet>
    <servlet-name>springMvc</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>
    <!-- 在tomcat启动的时候就加载这个servlet -->
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>springMvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

  <!--编码设置-->
  <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>

</web-app>

到此，ssm的环境基本算是搭建成功，接下来是要编码了。

5.编写后台代码

5.1数据库

5.2实体类

public class User {
    int id;
    String name;
    String password;
   // 省略get/set方法
}

5.3实体类映射文件（UserMapper.xml）

?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="UserDao">

 <select id="selectById" resultType="User">
   select * from user where id=#{id}
 </select>
</mapper>

5.4持久层（UserMapper）

@Repository
public class UserMapper {
    @Resource
    private SqlSessionFactory sqlSessionFactory;

    public User selectById(int id) {
        SqlSession sqlSession = sqlSessionFactory.openSession();
        return sqlSession.selectOne("UserDao.selectById", id);
    }
}

5.5业务层（UserService）

@Service
public class UserService {
    @Resource
    UserMapper userMapper;
    public User selectById(int id){

        return userMapper.selectById(id);
    }
}

5.6控制层（UserController）

@Controller
public class UserController {
    @Resource
    UserService service;

    @RequestMapping("/selectById/{id}")
    public String selectById(@PathVariable int id){
        User user = service.selectById(id);
        System.out.println(user);
        return null;
    }
}

6.启动项目

访问：http://localhost:8080/selectById/2

完整目录：