Java SSM框架的简单搭建

1.添加依赖包，可以通过properties统一框架版本

  <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>
    <springversion>5.0.8.RELEASE</springversion>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.11</version>
      <scope>test</scope>
    </dependency>
    <!-- 加入ServletAPI -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>3.1.0</version>
      <scope>provided</scope>
    </dependency>
    <!-- MySQL依赖 start -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.38</version>
    </dependency>
    <!-- 加入MyBatis 依赖 start -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.2.8</version>
    </dependency>
    <!-- 引入Spring(包含SpringMVC) 依赖 start -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>${springversion}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-web</artifactId>
      <version>${springversion}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-oxm</artifactId>
      <version>${springversion}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</artifactId>
      <version>${springversion}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${springversion}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>${springversion}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>${springversion}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context-support</artifactId>
      <version>${springversion}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${springversion}</version> </dependency>
    <!-- 引用插件依赖：MyBatis整合Spring,如果mybatis版本在3.4及以上版本 mybatis-spring的版本要在1.3以上 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.2.2</version>
    </dependency>
    <!-- JSTL -->
    <dependency>
      <groupId>jstl</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    <!-- 德鲁伊数据连接池 -->
    <dependency>
      <groupId>com.alibaba</groupId>
      <artifactId>druid</artifactId>
      <version>1.0.9</version>
    </dependency>
    <!-- pagehelper -->
    <dependency>
      <groupId>com.github.pagehelper</groupId>
      <artifactId>pagehelper</artifactId>
      <version>4.1.6</version>
    </dependency>
    <!--处理json-->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.9.5</version>
    </dependency>
    <!--javaee-->
    <dependency> <groupId>javax</groupId> <artifactId>javaee-api</artifactId> <version>7.0</version> <scope>provided</scope> </dependency>
    <!--文件上传下载-->
    <dependency> <groupId>commons-fileupload</groupId> <artifactId>commons-fileupload</artifactId> <version>1.3.1</version> </dependency>
    <dependency> <groupId>commons-io</groupId> <artifactId>commons-io</artifactId> <version>2.4</version> </dependency>
  </dependencies>

2.添加spring配置文件，ssm中可以省略mybatis.xml文件 

3.配置web.xml文件，同时加载spring配置文件

<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" version="2.5">
  <display-name>Archetype Created Web Application</display-name>

  <!--1.配置前端控制器-->
  <servlet>
    <servlet-name>aa</servlet-name>
    <servlet-class>
      org.springframework.web.servlet.DispatcherServlet
    </servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:spring.xml</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>aa</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>

  <!--2.处理post乱码-->
  <filter>
    <filter-name>bb</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>bb</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

 

4.创建数据表,添加项目包结构，包括实体类等

给dao,service,web包下使用注解创建对象，给service,web中的属性注入对象 

 

5.配置spring.xml文件

<?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"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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
                           http://www.springframework.org/schema/tx
                           http://www.springframework.org/schema/tx/spring-tx.xsd">

    <!--1.配置数据源-->
    <bean id="db" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
        <property name="url" value="jdbc:mysql://localhost:3306/hunan"></property>
        <property name="username" value="root"></property>
        <property name="password" value=""></property>
    </bean>
    <!--2.创建sqlSessionFactory-->
    <bean id="fac" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="db"></property>
        <property name="configLocation" value="classpath:mybatis.xml"></property> <!--指定mybatis的配置文件路径-->
        <property name="mapperLocations" value="classpath:mapper/*.xml"></property><!--指定mybatis的mapper文件路径-->
    </bean>
    <!--3.创建sqlSessionFactory-->
    <bean class="org.mybatis.spring.SqlSessionTemplate">
        <constructor-arg index="0" ref="fac"></constructor-arg>
    </bean>
    <!--4.配置事务-->
    <bean id="mytx" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="db"></property>
    </bean>
    <tx:annotation-driven transaction-manager="mytx"></tx:annotation-driven>
    <!--5.启用springmvc注解-->
    <mvc:annotation-driven></mvc:annotation-driven>
    <!--6.配置视图解析器-->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/"/>
        <property name="suffix" value=".jsp"></property>
    </bean>
    <!--7.扫描注解包-->
    <context:component-scan base-package="com.java"></context:component-scan>
    <!--8.配置静态资源访问-->
    <mvc:default-servlet-handler></mvc:default-servlet-handler>

6.配置controller文件

使用的注解：@Controller,@RequestMapping,@AutoWired,@Qualififier("empBiz")

 

7.添加service,dao层

使用的注解：@Service ，@AutoWired

(1) dao层省略了实现类

(2) dao 层只定义接口,由小树叶创建dao层对象以及扫描mapper文件

注:当添加了spring-jdbc的jar包后，会自动提交事务

 

补充:

分页插件: 

<plugins> 
    <!-- PageHelper4.1.6 --> 
　　<plugin interceptor="com.github.pagehelper.PageHelper">         
　　<property name="dialect" value="mysql"/> 
</plugin> 
</plugins>        

(1) 省略dao层实现类(使用MapperScannerConfifigurer替代SqlSessionTemplate): 

<!--省略实现类--> 
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">     
　　<property name="basePackage" value="com.dao"></property> 
　　<property name="sqlSessionFactoryBeanName" value="fac"></property> 
</bean>

注意:此时也可以测试使用属性文件的方式来加载数据源(支持属性文件链接数据源)

(2) maven类型的web项目加载mybatis-generator插件

注意:反向生成后，最好把该指令删除，否则不小心点了之后，又会生成一遍代码，尤其是mapper.xml文件中sql语

句又会生成一遍，运行时会报错。

 

总结：大体流程是，网页请求->调用web.xml配置文件(springMVC框架，解决网页请求对应类调用)，(前端->controller)

　　　　　　　　　　　　->调用spring.xml配置文件(解决调度类中对象的注入IOC)，对应servlet->service层

　　　　　　　　　　　　->调用mybatis配置文件，对应dao(bean)->数据库

　　　　　　　　　　　　->逐层返回