SSM 即:Spring+SpringMVC+Mybatis
SpringMVC 负责实现 MVC 设计模式,MyBatis 负责数据持久层,Spring 负责管理 Spring MVC 和 MyBatis 相关对象的创建和依赖注入。三者关系简单说就是,Spring是管理员,SpringMVC 和 Mybatis 分工协助完成工作。
请确保你有一定的javaweb基础,再往下看。
我们创建一个Maven项目,Maven可以让我们很好的实现jar包管理。可以勾选上web项目。如下图:
在pom.xml添加一些必备的依赖,SpringAop,SpringMVC,Mybatis,Mybatis-Spring,Servlet-api,Lombok,C3P0,MySQL,Spring-JDBC
<dependencies>
<!-- SpringMVC -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.0.11.RELEASE</version>
</dependency>
<!-- Spring JDBC -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.0.11.RELEASE</version>
</dependency>
<!-- Spring AOP -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>5.0.11.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>5.0.11.RELEASE</version>
</dependency>
<!-- MyBatis -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.5</version>
</dependency>
<!-- MyBatis整合Spring -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.1</version>
</dependency>
<!-- MySQL驱动 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.11</version>
</dependency>
<!-- C3P0 -->
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<!-- JSTL -->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!-- ServletAPI -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.6</version>
<scope>provided</scope>
</dependency>
</dependencies>
在写配置之前,我们先完成整体的目录架构。注意:resources要有个小图标在那里。
没有的话可以右键,点击 mark Directory as -> resources root
介绍一下resources结构
- config 一些配置文件
- mapper mybatis.xml
接下来在web.xml中配置 SpringMVC、Spring、字符编码过滤器、放行静态资源。
注意:这里web.xml可能会报一个警告,没有关系。
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<!-- 加载spring-->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:config/spring.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- 加载Spring MVC -->
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:config/springmvc.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- 字符编码过滤器 -->
<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>
<!-- 加载静态资源 -->
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.js</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.css</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.jpg</url-pattern>
</servlet-mapping>
</web-app>
将Spring和Mybatis进行整合。 在spring.xml中加入配置:
<?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:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation
="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd">
<!-- 整合MyBatis -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="user" value="root"></property>
<property name="password" value="123456"></property>
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/scoa?useSSL=false&useUnicode=true&characterEncoding=utf-8&serverTimezone=GMT%2B8"></property>
<property name="driverClass" value="com.mysql.cj.jdbc.Driver"></property>
<property name="initialPoolSize" value="5"></property>
<property name="maxPoolSize" value="10"></property>
</bean>
<!-- 配置MyBatis SqlSessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
<property name="mapperLocations" value="classpath:mapper/*.xml"></property>
<property name="configLocation" value="classpath:config/mybatis-config.xml"></property>
</bean>
<!-- 扫描自定义的Mapper接口 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.xn2001.dao"></property>
</bean>
</beans>
mybatis-config.xml,有关Mybatis的配置都可以写在这里。
<?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-->
<setting name="logImpl" value="STDOUT_LOGGING" />
<setting name="mapUnderscoreToCamelCase" value="true"/>
</settings>
<typeAliases>
<!-- 指定一个包名,MyBatis会在包名下搜索需要的JavaBean-->
<package name="com.xn2001.entity"/>
</typeAliases>
</configuration>
springmvc.xml 主要是开启注解驱动和配置好视图解析器
<?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-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd">
<!-- 启动注解驱动 -->
<mvc:annotation-driven></mvc:annotation-driven>
<!-- 扫描业务代码 -->
<context:component-scan base-package="com.xn2001"></context:component-scan>
<!-- 配置视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
到这里SSM框架就基本搭建起来了,大家也可以引入 Junit4 来进行单元测试。
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