前言
之前也说过，工作做的开发都是基于公司现有的框架，心里很没底。所以一直想自己能够搭建出ssm框架。经过多次尝试，终于成功了。这边文章将从两个方面进行，一是框架搭建，二是简单的增删查改。
正文
1.环境搭建
这里采用现在流行的maven方式，而是将需要的jar放在web_inf\lib下面了。
直接贴了一张图，有点任性了...整个工程的结构如下图所示
在conf子包中，是配置文件。mapper下对应mybatis的映射文件，里面包含了相应的sql语句。(mvcLearn\conf\mapper\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">
<!-- 文件的命名 表名 + Mapper -->
<!-- namespace:接口包 + 接口名
-->
<mapper namespace="org.tonny.map.IUserMapper">
<select id="getUserById" parameterType="int" resultType="org.tonny.model.User">
SELECT *
FROM users WHERE id=#{id}
</select>
<select id="getAll" resultType="org.tonny.model.User">
SELECT *
FROM users
</select>
<insert id="add" parameterType="org.tonny.model.User">
INSERT INTO users(name,age)
VALUES(#{name}, #{age})
</insert>
<update id="update" parameterType="org.tonny.model.User">
UPDATE users
SET name = #{name},age = #{age}
WHERE id=#{id}
</update>
<delete id="delete" parameterType="int">
DELETE FROM users
WHERE id=#{id}
</delete>
</mapper>
db.properties是数据库相关的信息，如ip，用户名，密码等。
driverClassName=com.mysql.jdbc.Driver url=jdbc:mysql://localhost:3306/mybatis username=root password=1qaz2wsx
log4j.properties是log日志的配置文件，记录了输出级别，输出形式等。
# Root logger option
log4j.rootLogger=INFO, stdout
# Direct log messages to stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
mybatis.xml是mybatis的配置文件，里面描述了mybatis的配置信息,如别名，mybatis的日志属性等。
<?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>
<!-- 设置日志打印 -->
<settings>
<setting name="logImpl" value="LOG4J"/>
</settings>
<!-- 配置映射类的别名 -->
<typeAliases>
<typeAlias alias="User" type="org.tonny.model.User" />
</typeAliases>
<!-- 配置Mapper文件的路径 -->
<mappers>
<!-- <mapper resource="mapper/UserMapper.xml" /> -->
</mappers>
</configuration>
spring-mvc.xml是springmvc的配置文件，里面配置了如分发器，jsp前缀后缀等。
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-4.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.1.xsd">
<mvc:annotation-driven />
<!-- 把标记了@Controller注解的类转换为bean，这个里面只要关注控制器，其他的bean在spring中去扫描 -->
<context:component-scan base-package="org.tonny.controller" />
<!-- 对模型视图名称的解析，即在模型视图名称添加前后缀 -->
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver"
p:prefix="/WEB-INF/view/" p:suffix=".jsp" />
</beans>
spring.xml则描述了bean的配置,一些配置文件之间的关系则会在这里体现。
<?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:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop-4.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.1.xsd">
<!-- 自动扫描注解的bean -->
<context:component-scan base-package="org.tonny" />
<!-- 引入配置文件 -->
<bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath*:db.properties</value>
</list>
</property>
</bean>
<!-- 配置数据源 -->
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${driverClassName}" />
<property name="url" value="${url}" />
<property name="username" value="${username}" />
<property name="password" value="${password}" />
</bean>
<!-- 引用Mapper文件 -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<!-- 设置mybatis文件 -->
<property name="configLocation" value="classpath:mybatis.xml"></property>
<!-- 扫描mybatis表对应的文件 -->
<property name="mapperLocations" value="classpath*:mapper/*Mapper.xml" />
</bean>
<!-- 配置接口与mapper.xml的对应关系 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<!--
如果使用
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
会发生错误，因为db.propertites加载在sqlSessionFactory之后，所以使用sqlSessionFactoryBeanName代替
-->
<!-- 配置mapper对应的接口，指定所在的包 -->
<property name="basePackage" value="org.tonny.map" />
</bean>
</beans>
最后是web.xml中汇总，形成关联。
<?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_3_0.xsd"
id="WebApp_ID" version="3.0">
<!-- Spring 容器加载 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring.xml</param-value>
</context-param>
<!-- log4j 这一段不配置，log4j配置文件也是可以使用的,这边应该单独给Spring的使用-->
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>classpath:log4j.properties</param-value>
</context-param>
<context-param>
<param-name>log4jRefreshInterval</param-name>
<param-value>600000</param-value>
</context-param>
<!-- SpringMVC的前端控制器 -->
<servlet>
<servlet-name>spring-dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 加载配置文件路径 -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mvc.xml</param-value>
</init-param>
<!-- 何时启动 大于0的值表示容器启动时初始化此servlet，正值越小优先级越高 -->
<load-on-startup>1</load-on-startup>
</servlet>
<!-- Spring MVC配置文件结束 -->
<!-- SpringMVC拦截设置 -->
<servlet-mapping>
<servlet-name>spring-dispatcher</servlet-name>
<!-- 由SpringMVC拦截所有请求 -->
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- SpringMVC拦截设置结束 -->
<!--解决中文乱码问题 -->
<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>
</web-app>
时间： 2024-10-13 20:30:14