IDEA使用maven创建简易SSM项目

一、概述
SSM为当前比较主流的web开发框架，分别代表着spring、springMVC、Mybatis。

二、创建
1.首先创建一个maven webapp项目的空壳

2.导入依赖：分别导入spring核心包：spring-core、spring-web、spring-oxm、spring-tx、spring-jdbc、spring-webmvc、spring-aop、spring-context-support、spring-test;
mybatis核心包：mybatis、mybatis-spring
javaee包：javaee-api
mysql链接包：mysql-connector-java；
dbcp的jar包：commons-dbcp，用来在applicationContext.xml中配置数据库
JSTL标签类：jstl
日志文件管理：log4j
数据连接池:此处使用c3p0，slf4j-api，slf4j-log4j12
导入servlet-api/jsp：javax.servlet-api，javax.servlet.jsp-api
具体的版本以及依赖自行前往MVN选定，此处只是演示简单的SSM项目，只使用了IOC容器，并未使用到AOP编程

3 编写配置文件
3.1 数据连接池的配置，注册bean

<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:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
<!-- 1.配置数据库相关参数properties的属性：${url} -->
<context:property-placeholder location="classpath:db.properties"/>
<!-- 2.配置数据源 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driver}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<property name="maxPoolSize" value="30"/>
<property name="minPoolSize" value="2"/>
</bean>
<!-- 3.配置SqlSessionFactory对象 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 注入数据库连接池 -->
<property name="dataSource" ref="dataSource"/>
<!-- 扫描bean包 使用别名 -->
<property name="typeAliasesPackage" value="com.zhongruan.beans"></property>
<!--配置加载映射文件 UserMapper.xml-->
<property name="mapperLocations" value="classpath:mapper/*.xml"/
</bean>
<!-- 自动生成dao,mapper-->
<!-- 4.配置扫描Dao接口包，动态实现Dao接口，注入到spring容器中 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 给出需要扫描Dao接口包 -->
<property name="basePackage" value="com.zhongruan.dao"/>
<!-- 注入sqlSessionFactory -->
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>
<!--自动扫描-->
<context:component-scan base-package="com.zhongruan"/>
<!-- 配置事务-->
<!-- 5.配置事务管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<!-- 6.开启事务注解-->
<tx:annotation-driven></tx:annotation-driven>
</beans>

3.2 视图解析的配置

<?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:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.3.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
<!-- 1.注解扫描位置-->
<context:component-scan base-package="com.zhongruan.controller"/>
<!-- 2.配置映射处理和适配器-->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/>
<!-- 3.视图的解析器-->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/pages/" />
<property name="suffix" value=".jsp" />
</bean>
</beans>

3.3 在web.xml中加载配置文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<!-- 配置加载类路径的配置文件 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:applicationContext.xml</param-value>
</context-param>
<!-- 配置监听器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<listener>
<listener-class>org.springframework.web.context.request.RequestContextListener</listener-class>
</listener>
<!-- 解决中文乱码过滤器 -->
<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>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

<!-- 前端控制器（加载classpath:spring-mvc.xml 服务器启动创建servlet） -->
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 配置初始化参数，创建完DispatcherServlet对象，加载springmvc.xml配置文件 -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mvc.xml</param-value>
</init-param>
<!-- 服务器启动的时候，让DispatcherServlet对象创建 -->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
</web-app>

4.编写dao层接口，并编写对应的配置文件省却访问数据库那一步：

配置文件中的id要跟dao的接口方法名匹配，类似bean

5.编写service层，并调用dao接口实现相关功能

@Service  //特殊的bean，也加入到容器中
public class UserServiceImpl implements UserService
{
@Autowired              //自动装配，依赖反转的标志
private UserDao userDao;
@Override
public int login(String username, String password) {
User user=userDao.findByUserName(username);
if (user!=null&&user.getPassword().equals(password))
return user.getId();
return -1;
}
}

6.编写controller层：

@Controller
@RequestMapping("/user")
public class UserController {
@Autowired
private UserService userService;
@RequestMapping("/login.do")
public ModelAndView login(User user){
int i= userService.login(user.getUsername(),user.getPassword());
ModelAndView mv=new ModelAndView();
if (i!=-1)
mv.setViewName("main");
else
mv.setViewName("../failer");
return mv;
}
}

由此，SSM的后端基本完成，前端可以写jsp完成。