SSM框架(一)

SSM框架初探

一.创建一个Maven的项目


SSM框架(一)
 

新建的maven web项目，创建成功之后出现以下两种错误：

（1）-->webapp下缺少web.xml文件需要手动创建一个

（2）-->编译器的版本为1.5，需要切换到当前JDK的版本。pom.xml文件中需要添加如下内容：

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.7.0</version>
        <configuration>
           <source>1.7</source>
          <target>1.7</target>
        </configuration>
      </plugin>
    </plugins>
  </build>

 

Pom文件修改完成之后右键Maven->update project(Alt+F5)

 

二.Spring+Spring MVC+Mybatis框架配置文件

 

1.pom.xml中依赖

 

<dependencies>
  
  		<dependency>
  			<groupId>junit</groupId>
  			<artifactId>junit</artifactId>
  			<version>${junit.version}</version>
  			<!-- 开发的时候引入，发布的时候不会加载此包 -->
  			<scope>test</scope>
  		</dependency>
  		
  		<!-- dom4j包 -->
  		<dependency>
  			<groupId>dom4j</groupId>
  			<artifactId>dom4j</artifactId>
  			<version>1.6.1</version>
  		</dependency>
      
        <!-- spring 核心包 NO.9 -->
        <dependency>
  			<groupId>org.springframework</groupId>
  			<artifactId>spring-core</artifactId>
  			<version>${spring.version}</version>
  		</dependency>
      
    	<dependency>
  			<groupId>org.springframework</groupId>
  			<artifactId>spring-web</artifactId>
  			<version>${spring.version}</version>
  		</dependency>
  	
  		<dependency>
  			<groupId>org.springframework</groupId>
  			<artifactId>spring-jdbc</artifactId>
  			<version>${spring.version}</version>
  		</dependency>
  		
  		<dependency>
  			<groupId>org.springframework</groupId>
  			<artifactId>spring-webmvc</artifactId>
  			<version>${spring.version}</version>
  		</dependency>
  		
  		<dependency>
  			<groupId>org.springframework</groupId>
  			<artifactId>spring-aop</artifactId>
  			<version>${spring.version}</version>
  		</dependency>
  		
  		<dependency>
  			<groupId>org.springframework</groupId>
  			<artifactId>spring-context-support</artifactId>
  			<version>${spring.version}</version>
  		</dependency>
  
  		<dependency>
  			<groupId>org.springframework</groupId>
  			<artifactId>spring-test</artifactId>
  			<version>${spring.version}</version>
  		</dependency>
  		
  		<!-- mybatis核心包 -->
  		<dependency>
  			<groupId>org.mybatis</groupId>
  			<artifactId>mybatis</artifactId>
  			<version>${mybatis.version}</version>
  		</dependency>
  		
  		<dependency>
  			<groupId>org.mybatis</groupId>
  			<artifactId>mybatis-spring</artifactId>
  			<version>1.2.0</version>
  		</dependency>
  		
  		<!-- java ee jar包 
  		<dependency>
  			<groupId>javax</groupId>
  			<artifactId>javaee-api</artifactId>
  			<version>7.0</version>
  		</dependency>
  		 -->
  		
  		<!-- mysql链接数据库jar -->
  		<dependency>
  			<groupId>mysql</groupId>
  			<artifactId>mysql-connector-java</artifactId>
  			<version>5.1.39</version>
  		</dependency>
  		
        <!-- dbcp数据库连接池 
        <dependency>
  			<groupId>commons-dbcp</groupId>
  			<artifactId>commons-dbcp</artifactId>
  			<version>1.4</version>
  		</dependency> -->
  		
  	<dependency>  
        <groupId>c3p0</groupId>  
        <artifactId>c3p0</artifactId>  
        <version>0.9.1.2</version>  
        <type>jar</type>  
    </dependency> 
  		
  		<!-- 日志文件管理包 -->
  		<dependency>
  			<groupId>log4j</groupId>
  			<artifactId>log4j</artifactId>
  			<version>${log4j.version}</version>
  		</dependency>
  		
  		<!-- 格式化对象，方便输出日志 -->
  		<dependency>
  			<groupId>com.alibaba</groupId>
  			<artifactId>fastjson</artifactId>
  			<version>1.2.7</version>
  		</dependency>
  		
  		<!-- slf4j包 -->
  		<dependency>
  			<groupId>org.slf4j</groupId>
  			<artifactId>slf4j-api</artifactId>
  			<version>${slf4j.version}</version>
  		</dependency>
  		
  		<dependency>
  			<groupId>org.slf4j</groupId>
  			<artifactId>slf4j-log4j12</artifactId>
  			<version>${slf4j.version}</version>
  		</dependency>
  		
  		<!-- json包 -->
  		<dependency>
  			<groupId>org.codehaus.jackson</groupId>
  			<artifactId>jackson-mapper-asl</artifactId>
  			<version>1.9.13</version>
  		</dependency>
  		
  		<!-- 上传组件包 -->
  		<dependency>
  			<groupId>commons-fileupload</groupId>
  			<artifactId>commons-fileupload</artifactId>
  			<version>1.3.2</version>
  		</dependency>
  		
  		<dependency>
  			<groupId>commons-io</groupId>
  			<artifactId>commons-io</artifactId>
  			<version>2.4</version>
  		</dependency>
  		
  		<dependency>
  			<groupId>commons-codec</groupId>
  			<artifactId>commons-codec</artifactId>
  			<version>1.9</version>
  		</dependency>
  		
  		<dependency>
  			<groupId>com.fasterxml.jackson.core</groupId>
  			<artifactId>jackson-databind</artifactId>
  			<version>2.7.4</version>
  		</dependency>
  		
        <!-- Jersey 依赖 -->
  		<dependency>
  			<groupId>org.glassfish.jersey.core</groupId>
  			<artifactId>jersey-common</artifactId>
  			<version>${jersey.version}</version>
  		</dependency>
  		
  		<dependency>
  			<groupId>org.glassfish.jersey.core</groupId>
  			<artifactId>jersey-server</artifactId>
  			<version>${jersey.version}</version>
  		</dependency>
  		
  		<dependency>
  			<groupId>org.glassfish.jersey.core</groupId>
  			<artifactId>jersey-client</artifactId>
  			<version>${jersey.version}</version>
  		</dependency>
  		
  		<dependency>
  			<groupId>org.glassfish.jersey.containers</groupId>
  			<artifactId>jersey-container-servlet-core</artifactId>
  			<version>${jersey.version}</version>
  		</dependency>
  		
  		<dependency>
  			<groupId>org.glassfish.jersey.media</groupId>
  			<artifactId>jersey-media-json-jackson</artifactId>
  			<version>${jersey.version}</version>
  		</dependency>
  		
  		<dependency>
  			<groupId>org.glassfish.jersey.ext</groupId>
  			<artifactId>jersey-spring3</artifactId>
  			<version>${jersey.version}</version>
  			<exclusions>
  			
  				<exclusion>
  					<artifactId>spring-context</artifactId>
  					<groupId>org.springframework</groupId>	
  				</exclusion>
  				
  				<exclusion>
  					<artifactId>spring-beans</artifactId>
  					<groupId>org.springframework</groupId>	
  				</exclusion>
  				
  				<exclusion>
  					<artifactId>spring-core</artifactId>
  					<groupId>org.springframework</groupId>	
  				</exclusion>
  				
  				<exclusion>
  					<artifactId>spring-web</artifactId>
  					<groupId>org.springframework</groupId>	
  				</exclusion>
  				
  				<exclusion>
  					<artifactId>jersey-server</artifactId>
  					<groupId>org.glassfish.jersey.core</groupId>	
  				</exclusion>
  				
  				<exclusion>
  					<artifactId>jersey-container-servlet-core</artifactId>
  					<groupId>org.glassfish.jersey.containers</groupId>	
  				</exclusion>
  				
  				<exclusion>
  					<artifactId>hk2</artifactId>
  					<groupId>org.glassfish.hk2</groupId>	
  				</exclusion>		
  			
  			</exclusions>
  		</dependency>
  		
  		<!-- 抓取网页 -->
  		<dependency>
  			<groupId>org.jsoup</groupId>
  			<artifactId>jsoup</artifactId>
  			<version>1.8.3</version>
  		</dependency>
	</dependencies>
 

 

2.程序入口web.xml的配置

 

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"  
    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">  
  <display-name>my-ssm</display-name> 
  
  <!-- Spring-mybatis的配置文件 -->  
<context-param>  
    <param-name>contextConfigLocation</param-name>  
    <param-value>classpath:spring/spring-mybatis.xml</param-value> 
</context-param>
   
  
<!-- Spring-mvc充当控制器配置文件 
<context-param>  
    <param-name>contextConfigLocation</param-name>  
    <param-value>classpath:spring/spring-mvc.xml</param-value> 
</context-param>
 --> 

<listener>  
    <description>spring监听器</description>  
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  
</listener>  
  
<!-- 防止spring内存溢出监听器 -->  
<listener>  
    <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>  
</listener>  

<!-- 加载log4j -->
 <context-param>  
        <param-name>log4jConfigLocation</param-name>  
        <param-value>classpath:properties/log4j.properties</param-value>  
 </context-param>
 
 <listener>  
        <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>  
 </listener> 
 
<!-- 配置springmvc的DispatcherServlet，处理所有的url --> 
<servlet> 
    <servlet-name>springmvc</servlet-name> 
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <init-param>  
        <description>spring mvc 配置文件</description>  
        <param-name>contextConfigLocation</param-name>  
        <param-value>classpath:spring/spring-mvc.xml</param-value>  
    </init-param>   
</servlet> 
<servlet-mapping> 
    <servlet-name>springmvc</servlet-name> 
    <url-pattern>/</url-pattern> 
</servlet-mapping> 

  
<filter>  
    <description>字符集过滤器</description>  
    <filter-name>encodingFilter</filter-name>  
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>  
    <init-param>  
        <description>字符集编码</description>  
        <param-name>encoding</param-name>  
        <param-value>UTF-8</param-value>  
    </init-param>  
</filter>  
<filter-mapping>  
    <filter-name>encodingFilter</filter-name>  
    <url-pattern>/*</url-pattern>  
</filter-mapping>  
  
<!-- 配置session超时时间，单位分钟 -->  
<session-config>  
    <session-timeout>60</session-timeout>  
</session-config>  
  
<!-- DEFAULT PAGE -->  
<welcome-file-list>  
    <welcome-file>index.jsp</welcome-file>  
</welcome-file-list>  
  
</web-app>

 

    上述配置需要注意的时，“Spring-mvc充当控制器配置文件”位置处的注释要把配置写入到Servlet节点下的init-param节点中，否者会报错。

    通过上述web.xml文件的配置，可以看出还需要配置如下配置文件spring-mvc.xml(spirng mvc控制器的配置文件)以及 spring与mybatis整合的spring-mybatis配置文件。

 

2.1spring-mvc 配置文件

 

<?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:p="http://www.springframework.org/schema/p" 
    xmlns:context="http://www.springframework.org/schema/context" 
    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">
        
        
<!-- 自动扫描注解，只扫描的Controller注解，其它注解的扫描交给spring去处理 --> 
<context:component-scan base-package="com.gitee"> 
    <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller" />   
    <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Service" />  
</context:component-scan> 

    <!-- 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">  
        <property name="prefix" value="/WEB-INF/jsp/" />  
        <property name="suffix" value=".jsp" /><!--可为空,方便实现自已的依据扩展名来选择视图解释类的逻辑 -->  
    </bean>  

</beans>

  此处省略了诸如事务管理，切面的配置等信息，只是简单的配置了一下spring mvc的配置，后续完善。

 

2.2 spring与mybatis整合的配置文件

 

<?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:aop="http://www.springframework.org/schema/aop"
	xsi:schemaLocation="  
           http://www.springframework.org/schema/beans  
           http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  
           http://www.springframework.org/schema/aop  
           http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
           http://www.springframework.org/schema/context  
           http://www.springframework.org/schema/context/spring-context-3.0.xsd">
     
     <!-- 引入jdbc配置文件 -->  
     <bean id="propertyConfigurer" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="locations">
            <list>
               <value>classpath:properties/*.properties</value>
                <!--要是有多个配置文件，只需在这里继续添加即可 -->
            </list>
        </property>
    </bean>
    
    <!-- 自动扫描注解的bean -->
	<context:component-scan base-package="com.gitee" />
    
    <!-- 配置c3p0数据源 -->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"  
        destroy-method="close"> 
        
        <!-- 不使用properties来配置 -->
		<!-- <property name="driverClassName" value="com.mysql.jdbc.Driver" /> 
			<property name="url" value="jdbc:mysql://localhost:3306/learning" /> 
			<property name="username" value="root" /> 
			<property name="password" value="[email protected]" /> -->
         
        <property name="driverClass" value="${db.driver}" />  
        <property name="jdbcUrl" value="${db.url}" />  
        <property name="user" value="${db.username}" />  
        <property name="password" value="${db.password}" />  
        <property name="minPoolSize" value="1" />  
        <property name="maxPoolSize" value="20" />  
        <property name="maxIdleTime" value="1800" />  
        <property name="acquireIncrement" value="2" />  
        <property name="maxStatements" value="0" />  
        <property name="initialPoolSize" value="2" />  
        <property name="idleConnectionTestPeriod" value="1800" />  
        <property name="acquireRetryAttempts" value="30" />  
        <property name="breakAfterAcquireFailure" value="true" />  
        <property name="testConnectionOnCheckout" value="false" /> 
        
    </bean>    
    
    <!-- 配置Mybatis的文件 ，mapperLocations配置**Mapper.xml文件位置，configLocation配置mybatis-config文件位置-->
	<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
		<!-- 关联数据源 -->
		<property name="dataSource" ref="dataSource" />
		<!-- mybatis的主配置文件 -->
		<property name="configLocation" value="classpath:mybatis/mybatis-config.xml" />
	    <!-- mybatis的映射文件 --> 	
        <property name="mapperLocations" value="classpath:mybatis/mysql/*.xml"/>  
	</bean>

    <!-- 自动扫描 *mapper.java -->
	<!-- 自动扫描了所有的*Mapper.xml对应的mapper接口文件。不用一个个手动配置Mpper的映射了，只要Mapper接口类和Mapper映射文件对应起来就可以了 -->
	<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
		<property name="basePackage" value="com.gitee.mapper" />
	</bean>

</beans>

    通过上述的配置文件，我们知道还需要配置名为mybatis-config.xml的mybatis的主配置文件以及mybatis自己的映射文件。

 

2.2.1 mybatis主配置文件

 

<?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>    
</configuration>

 正常的mybatis的主配置文件，至少要有environments,以及mappers两个节点，此处没有配置的原因，也是将关联配置文件创建SqlSession对象的功能交给了spring容器帮我们完成。

 

2.2.2 mybatis映射的配置文件

 

<?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">
<mapper namespace="com.gitee.mapper.IAddressMapper">

<!-- 查询地址 -->
<select id="queryAddessById" resultType="com.gitee.entity.Address">
 	select *from `address` where aid=#{aid}
</select>

</mapper>

  根据最佳实践，每一个mybatis xml映射文件最好对应一个 mapper的接口文件，因此该配置文件中namespace 对应的全限定名指向 *Mapper.java接口文件。

 

2.3总结

SSM框架整合中，用到的配置文件清单如下：
(1) pom.xml ：maven的对象工程模型文件，主要为了实现maven如下核心功能：

     ①依赖管理（jar包管理）；

     ②项目构建两个功能（指的是项目的编译，测试，打包，运行，部署都可以通过maven的命令来完成）

(2) web.xml：项目的入口文件主要配置了spring mvc的前端控制器，spring 的监听器等信息

(3) spring-mvc.xml：配置spring自动扫包配置，处理器映射器，处理器适配器，视图解析器等信息

(4) spring-mybatis.xml：配置了将mybatis的bean对象注入到spring容器的信息，如：数据源配置，自动扫描  映射接口文件的配置，mybatis的SqlSessionFactory的配置信息（该bean中指定了mybatis主配置文件的路径以及映射配置文件的路径）

(5)*Mapper.xml：mybatis的映射配置文件，主要实现sql的增删改查

 

三.SSM框架，mapper,dao,service,controller文件

 

3.1 mapper层

package com.gitee.mapper;

import org.apache.ibatis.annotations.Param;
import com.gitee.entity.Address;
/**
 * 最佳实践，每一个mapper.xml对应一个接口文件
 * @author Freedom
 *
 */
public interface IAddressMapper {

	//查地址
	Address queryAddessById(@Param("aid")Integer aid);
} 

与*mapper.xml映射文件中命名空间对应，每个*mapper.xml中 增删改查的节点id属性要唯一，并与接口中方法名保持一致

 

3.2 dao层

package com.gitee.dao.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

import com.gitee.dao.IAddressDao;
import com.gitee.entity.Address;
import com.gitee.mapper.IAddressMapper;
@Repository
public class AddressDao implements IAddressDao {

	@Autowired
	private IAddressMapper addressMapper;
   	
	@Override
	public Address queryAddessById(Integer aid) {
		return addressMapper.queryAddessById(aid);
	}

}

 该层调用mapper层中方法

 

3.3 service层

package com.gitee.service.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.gitee.dao.IAddressDao;
import com.gitee.entity.Address;
import com.gitee.service.IAddressService;
@Service
public class AddressService implements IAddressService {

	@Autowired
	private IAddressDao addressDao;
	
	@Override
	public Address queryAddessById(Integer aid) {
		return addressDao.queryAddessById(aid);
	}

}

 

3.4 controller控制层

package com.gitee.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import com.gitee.entity.Address;
import com.gitee.service.IAddressService;

@Controller
@RequestMapping("/address")
public class AddressController {

	@Autowired
	private IAddressService addressSevice;
	
	@RequestMapping("/getaddress")
	public String queryAddress(Integer aid, Model model){
		
		Address address  = addressSevice.queryAddessById(aid);
		if(null != address){
			model.addAttribute("msg", "查询地址成功。");
			model.addAttribute("address", address);
			return "/success";
		}else{
			model.addAttribute("msg", "查询地址成功失败。");
			return "fail";
			
		}		
		
	}
} 

 

至此，框架构建基本完成，后续加入日志，事务信息。

 

四.运行项目

 

4.1搭建成功后两种运行方式：

右键 Run As->6Maven build... 弹出的命令框中输入 tomcat:run

SSM框架(一)

 

4.1.2.debug的方式运行

右键Debug As->6Maven build...弹出如下命令框 


SSM框架(一)
 

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