01

新建java web项目

直接在myeclipse中，新建一个web项目即可。

02

导入jar包

将SSM所需的jar包复制到项目的/WebRoot/WEB-INF/lib中，在这里我整理了下，大致需要34个jar文件，复制完之后，选中所有jar包，右击—Build Path-->Add to Build Path。

03

配置web.xml文件。

web.xml文件需要配置三部分信息，spring、springmvc以及解决springmvc传值乱码的过滤器，分别如下：

spring配置信息：

<listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>

springmvc配置信息：

<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-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>

设置编码格式的过滤器信息：

<!-- 解决springmvc传递值乱码问题 -->
  <filter>
    <filter-name>encodingFilter</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>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

04

配置Spring配置文件

applicationContext.xml文件，里面需要包含这些信息：用来连接数据库的数据源信息

<!-- 配置数据源-->
  <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
    <property name="url" value="jdbc:mysql://localhost:3306/schooldb"></property>
    <property name="username" value="root"></property>
    <property name="password" value="root"></property>
  </bean>

加载mybatis-config.xml文件以及sql映射文件的SqlSessionFactory：

<!--sqlSessionFactory -->
  <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"></property>
    <property name="configLocation" value="classpath:mybatis-config.xml"></property>
    <property name="mapperLocations">
      <list>
        <value>classpath:org/dao/*.xml</value>
      </list>
    </property>
  </bean>

Mapper注入映射器的MapperScannerConfigurer：

<!-- 配置自动映射器 -->
  <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="org.dao"></property>
  </bean>

最后就是扫描注解的配置：

<!-- 扫描所有注解信息 -->
  <context:component-scan base-package="org.dao,org.service,org.web"/>
  <mvc:annotation-driven/>

05

配置springmvc的信息

springmvc-servlet.xml中需要包含最基本的两个部分，扫描注解和springmvc请求的前缀后缀设置：

<!-- 扫描注解 -->
  <context:component-scan base-package="org.web,org.dao,org.service"/>
  <mvc:annotation-driven/>
  
  <!-- 配置前缀和后缀 -->
  <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/"></property>
    <property name="suffix" value=".jsp"></property>
  </bean>

06

配置mybatis配置文件

本文件简单点，就配置个别名和打印sql语句就行，都是可选的：

<?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>
  
   <settings>
        <!-- 打印sql语句 -->
        <setting name="logImpl" value="STDOUT_LOGGING" />
    </settings>
  <!-- 起别名 -->
  <typeAliases>
    <package name="org.entity"/>
  </typeAliases>
  
</configuration>

附录：

spring配置文件（applicationContext.xml）：

<?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:p="http://www.springframework.org/schema/p"
  xmlns:aop="http://www.springframework.org/schema/aop"
  xmlns:mvc="http://www.springframework.org/schema/mvc"
  xmlns:context="http://www.springframework.org/schema/context"
  xsi:schemaLocation="
  http://www.springframework.org/schema/beans 
  http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
  http://www.springframework.org/schema/p 
  http://www.springframework.org/schema/p/spring-p-3.1.xsd
  http://www.springframework.org/schema/aop 
  http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
  http://www.springframework.org/schema/mvc 
  http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
  http://www.springframework.org/schema/context 
  http://www.springframework.org/schema/context/spring-context-3.1.xsd
  ">

  <!-- 配置数据源-->
  <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
    <property name="url" value="jdbc:mysql://localhost:3306/schooldb"></property>
    <property name="username" value="root"></property>
    <property name="password" value="root"></property>
  </bean>
  
  <!--sqlSessionFactory -->
  <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <property name="dataSource" ref="dataSource"></property>
    <property name="configLocation" value="classpath:mybatis-config.xml"></property>
    <property name="mapperLocations">
      <list>
        <value>classpath:org/dao/*.xml</value>
      </list>
    </property>
  </bean>
  
  <!-- 配置自动映射器 -->
  <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
    <property name="basePackage" value="org.dao"></property>
  </bean>
  
  <!-- 扫描所有注解信息 -->
  <context:component-scan base-package="org.dao,org.service,org.web"/>
  <mvc:annotation-driven/>

</beans>

springmvc配置文件（springmvc-servlet.xml）：

<?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:p="http://www.springframework.org/schema/p"
  xmlns:aop="http://www.springframework.org/schema/aop"
  xmlns:mvc="http://www.springframework.org/schema/mvc"
  xmlns:context="http://www.springframework.org/schema/context"
  xsi:schemaLocation="
  http://www.springframework.org/schema/beans 
  http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
  http://www.springframework.org/schema/p 
  http://www.springframework.org/schema/p/spring-p-3.1.xsd
  http://www.springframework.org/schema/aop 
  http://www.springframework.org/schema/aop/spring-aop-3.1.xsd
  http://www.springframework.org/schema/mvc 
  http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd
  http://www.springframework.org/schema/context 
  http://www.springframework.org/schema/context/spring-context-3.1.xsd
  ">
  
  <!-- 扫描注解 -->
  <context:component-scan base-package="org.web,org.dao,org.service"/>
  <mvc:annotation-driven/>
  
  <!-- 配置前缀和后缀 -->
  <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <property name="prefix" value="/"></property>
    <property name="suffix" value=".jsp"></property>
  </bean>

</beans>

web.xml文件：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
  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_3_0.xsd">
  <display-name></display-name>  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
  <!-- springmvc的配置 -->
  <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-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>
  
  <!-- spring -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  <!-- 监听配置 -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  
  <!-- 解决springmvc传递值乱码问题 -->
  <filter>
    <filter-name>encodingFilter</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>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  
</web-app>

配置到此结束，明天带着大家实现一遍SSM的增删改查案例。

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2021-01-10