一、思路：

(一) Dao层：

1、 SqlMapConfig.xml，空文件即可。需要文件头。

2、 applicationContext_dao.xml。

a) 数据库连接池

b) SqlSessionFactory对象，需要spring和 mybatis 整合包下的。

c) 配置mapper文件扫描器。

(二)Service层：

1、applicationContext_service.xml包扫描器，扫描@service注解的类。

2、applicationContext_trans.xml配置事务。

(三)Controller层：

Springmvc.xml

1、包扫描器，扫描@Controller注解的类。

2、配置注解驱动。

3、视图解析器。

(四)web.xml

1. 配置spring容量监听器

2. 配置前端控制器

二、构建项目

（一）构建 maven 项目，添加依赖

<?xml version=”1.0″ encoding=”UTF-8″?>

<project xmlns=”” xmlns:xsi=””

xsi:schemaLocation=” “>

<modelVersion>4.0.0</modelVersion>

<groupId>com.cenobitor</groupId>

<artifactId>ssm_template</artifactId>

<version>1.0-SNAPSHOT</version>

<packaging>war</packaging>

<name>ssm_template Maven Webapp</name>

<!– FIXME change it to the project’s website –>

<url>

<properties>

<!–设置编译的版本使用1.8版本–>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

<!– 和设置编译插件是一样的效果–>

<maven.compiler.source>1.8</maven.compiler.source>

<maven.compiler.target>1.8</maven.compiler.target>

< junit .version>4.12</junit.version>

<spring.version>4.3.10.RELEASE</spring.version>

<servlet-api.version>2.5</servlet-api.version>

<mybatis.version>3.2.8</mybatis.version>

<mybatis.spring.version>1.2.2</mybatis.spring.version>

<pagehelper.version>4.0.0</pagehelper.version>

<javassist.version>3.11.0.GA</javassist.version>

< mysql .version>5.1.32</mysql.version>

<druid.version>1.0.9</druid.version>

<commons-fileupload.version>1.3.1</commons-fileupload.version>

<commons-lang3.version>3.3.2</commons-lang3.version>

<commons-io.version>1.3.2</commons-io.version>

<jackson.version>2.8.9</jackson.version>

<jstl.version>1.2</jstl.version>

<jsp-api.version>2.0</jsp-api.version>

<fastjson.version>1.2.28</fastjson.version>

<slf4j.version>1.6.4</slf4j.version>

<lombok.version>1.16.20</lombok.version>

</properties>

<dependencies>

<!– Apache工具组件 –>

<dependency>

<groupId>org.apache.commons</groupId>

<artifactId>commons-lang3</artifactId>

<version>${commons-lang3.version}</version>

</dependency>

<dependency>

<groupId>org.apache.commons</groupId>

<artifactId>commons-io</artifactId>

<version>${commons-io.version}</version>

</dependency>

<!– Jackson Json处理工具包 –>

<dependency>

<groupId>com.fasterxml.jackson.core</groupId>

<artifactId>jackson-databind</artifactId>

<version>${jackson.version}</version>

</dependency>

<!–alibaba json处理工具包–>

<dependency>

<groupId>com.alibaba</groupId>

<artifactId>fastjson</artifactId>

<version>${fastjson.version}</version>

</dependency>

<!– 日志处理 –>

<dependency>

<groupId>org.slf4j</groupId>

<artifactId>slf4j-log4j12</artifactId>

<version>${slf4j.version}</version>

</dependency>

<!–实体类get/set注解–>

<dependency>

<groupId>org.projectlombok</groupId>

<artifactId>lombok</artifactId>

<version>${lombok.version}</version>

<scope>provided</scope>

</dependency>

<!–单元测试–>

<dependency>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

<version>${junit.version}</version>

</dependency>

<!– Spring –>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-context</artifactId>

<version>${spring.version}</version>

</dependency>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-beans</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-jdbc</artifactId>

<version>${spring.version}</version>

</dependency>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-aspects</artifactId>

<version>${spring.version}</version>

</dependency>

<dependency>

<groupId>org.springframework</groupId>

<artifactId>spring-jms</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>

<!–jsp相关–>

<dependency>

<groupId>javax. servlet </groupId>

<artifactId>servlet-api</artifactId>

<version>${servlet-api.version}</version>

<scope>provided</scope>

</dependency>

<!– 文件上传组件 –>

<dependency>

<groupId>commons-fileupload</groupId>

<artifactId>commons-fileupload</artifactId>

<version>${commons-fileupload.version}</version>

</dependency>

<!– Mybatis –>

<dependency>

<groupId>org.mybatis</groupId>

<artifactId>mybatis</artifactId>

<version>${mybatis.version}</version>

</dependency>

<dependency>

<groupId>org.mybatis</groupId>

<artifactId>mybatis-spring</artifactId>

<version>${mybatis.spring.version}</version>

</dependency>

<!–MyBatis分页插件–>

<dependency>

<groupId>com.github.pagehelper</groupId>

<artifactId>pagehelper</artifactId>

<version>${pagehelper.version}</version>

</dependency>

<!– MySql –>

<dependency>

<groupId>mysql</groupId>

<artifactId>mysql-connector-java</artifactId>

<version>${mysql.version}</version>

</dependency>

<!– 连接池 –>

<dependency>

<groupId>com.alibaba</groupId>

<artifactId>druid</artifactId>

<version>${druid.version}</version>

</dependency>

</dependencies>

<build>

<finalName>ssm_template</finalName>

<!–设置mapper.xml配置与mapper类处于同个包下,否则编译时候无法生成到同一目录下,会报BindingException–>

<resources>

<resource>

<directory>src/main/java</directory>

<includes>

<include>**/*.xml</include>

</includes>

</resource>

<resource>

<directory>src/main/resources</directory>

</resource>

</resources>

< plugin s>

<!– 配置Tomcat7插件 –>

<plugin>

<groupId>org.apache.tomcat.maven</groupId>

<artifactId>tomcat7-maven-plugin</artifactId>

<version>2.2</version>

<configuration>

<uriEncoding>UTF-8</uriEncoding>

</configuration>

</plugin>

<!– 配置打包时跳过测试 –>

<plugin>

<groupId>org.apache.maven.plugins</groupId>

<artifactId>maven-surefire-plugin</artifactId>

<version>2.12.4</version>

</plugin>

</plugins>

</build>

</project>

（二）applicationContext.xml的配置

1、applicationContext_ dao .xml（数据库）的配置

<?xml version=”1.0″ encoding=”UTF-8″?>

<beans xmlns=””

xmlns:context=””

xmlns:xsi=””

xsi:schemaLocation=”

“>

<!– dao层 数据库连接部分–>

<!– 加载配置文件 –>

<context:property-placeholder location=”classpath:properties/db.properties” />

<!– 数据库连接池 –>

<bean id=”dataSource” class=”com.alibaba.druid.pool.DruidDataSource” destroy-method=”close”>

<property name=”driverClassName” value=”${jdbc.driver}” />

<property name=”url” value=”${jdbc.url}” />

<property name=”username” value=”${jdbc.username}” />

<property name=”password” value=”${jdbc.password}”/>

<!– 连接池的最大数据库连接数 –>

<property name=”maxActive” value=”10″ />

<!– 最大空闲数 –>

<property name=”maxIdle” value=”5″ />

</bean>

<!– 配置SqlSessionFactory单例 –>

<bean id=”sqlSessionFactory” class=”org.mybatis.spring.SqlSessionFactoryBean”>

<!– 配置数据源 –>

<property name=”dataSource” ref=”dataSource” />

<!– 加载mybatis核心配置文件 –>

<property name=”configLocation” value=”classpath:mybatis/SqlMapConfig.xml” />

<!–别名包扫描–>

<property name=”typeAliasesPackage” value=”com.cenobitor. pojo “/>

</bean>

<!– 动态代理dao配置，包扫描(推荐方式)–>

<bean class=”org.mybatis.spring.mapper.MapperScannerConfigurer”>

<!– 支持多包配置，多包时用,或者;分隔 –>

<property name=”basePackage” value=”com.cenobitor.mapper” />

</bean>

</beans>

jdbc.driver=com.mysql.jdbc.Driver

jdbc.url=jdbc:mysql://localhost:3306/ssm?characterEncoding=utf-8

jdbc.username=root

jdbc.password=

2、applicationContext_service.xml（service扫描）的配置

<?xml version=”1.0″ encoding=”UTF-8″?>

<beans xmlns=””

xmlns:context=””

xmlns:xsi=””

xsi:schemaLocation=”

“>

<!– 配置service扫描 –>

<context:component-scan base-package=”com.cenobitor.service”/>

</beans>

3、applicationContext_trans.xml（事务）的配置

<?xml version=”1.0″ encoding=”UTF-8″?>

<beans xmlns=””

xmlns:aop=””

xmlns:tx=””

xmlns:xsi=””

xsi:schemaLocation=”

“>

<!– 事务管理器 –>

<bean id=”transactionManager” class=”org.springframework.jdbc.datasource.DataSourceTransactionManager”>

<!–数据源–>

<property name=”dataSource” ref=”dataSource”/>

</bean>

<!– 通知 –>

<tx:advice id=”txAdvice” transaction-manager=”transactionManager”>

<tx:attributes>

<tx:method name=”save*” propagation=”REQUIRED”/>

<tx:method name=”insert*” propagation=”REQUIRED”/>

<tx:method name=”delete*” propagation=”REQUIRED”/>

<tx:method name=”update*” propagation=”REQUIRED”/>

<tx:method name=”find*” propagation=”SUPPORTS” read-only=”true”/>

<tx:method name=”get*” propagation=”SUPPORTS” read-only=”true”/>

<tx:method name=”query*” propagation=”SUPPORTS” read-only=”true”/>

</tx:attributes>

</tx:advice>

<!– 切面 –>

<aop:config>

<aop:advisor advice-ref=”txAdvice” pointcut=”execution(* com.cenobitor.service.*.*(..))”/>

</aop:config>

</beans>

（三）web.xml 的配置

<?xml version=”1.0″ encoding=”UTF-8″?>

<web-app xmlns:xsi=””

xmlns=””

xsi:schemaLocation=”

”

id=”WebApp_ID” version=”2.5″>

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

<!– spring配置文件路径 –>

<context-param>

<param-name>contextConfigLocation</param-name>

<param-value>classpath:/spring/applicationContext_*.xml</param-value>

</context-param>

<!– 解决post乱码问题 –>

<filter>

<filter-name>encoding</filter-name>

<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

<!– 设置编码参是UTF8 –>

<init-param>

<param-name>encoding</param-name>

<param-value>UTF-8</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>encoding</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

<listener>

<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

</listener>

<!– 配置SpringMvc 前端控制器 –>

<servlet>

<servlet-name>springmvc</servlet-name>

<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<!–指定SpringMvc 配置文件–>

<!– springmvc的配置文件默认路径是 /WEB-INF/${servlet-name}_servlet.xml –>

<init-param>

<param-name>contextConfigLocation</param-name>

<param-value>classpath:spring/springmvc.xml</param-value>

</init-param>

</servlet>

<servlet-mapping>

<servlet-name>springmvc</servlet-name>

<url-pattern>*.action</url-pattern>

</servlet-mapping>

</web-app>

（四）MyBatis的配置文件，实体类和对应的映射文件由通用Mapper生成，在此采用手动创建方式（详细见下文件图片上传案例）

此处建文件,配置mybatis分页插件即可：

<?xml version=”1.0″ encoding=”UTF-8″ ?>

<!DOCTYPE configuration

PUBLIC “-//mybatis.org//DTD Config 3.0//EN”

“”>

<configuration>

<plugins>

<!– com.github.pagehelper为PageHelper类所在包名 –>

<plugin interceptor=”com.github.pagehelper.PageHelper”>

<!– 设置数据库类型Oracle,Mysql,MariaDB,SQLite,Hsqldb,PostgreSQL六种数据库–>

<property name=”dialect” value=”mysql”/>

</plugin>

</plugins>

</configuration>

（五）springMVC的配置

<?xml version=”1.0″ encoding=”UTF-8″?>

<beans xmlns=””

xmlns:xsi=””

xmlns:context=””

xmlns:mvc=””

xsi:schemaLocation=”

“>

<!–配置controller扫描–>

<context:component-scan base-package=”com.cenobitor.controller”/>

<!– 注解驱动 –>

<mvc:annotation-driven/>

<!–&lt;!&ndash;自定义转换器配置模板&ndash;&gt;

&lt;!&ndash;使用自定义转换器&ndash;&gt;

<mvc:annotation-driven conversion-service=”myConverter” />

&lt;!&ndash; 定义转换器 &ndash;&gt;

<bean id=”myConverter” class=”org.springframework.format.support.FormattingConversionServiceFactoryBean”>

<property name=”converters”>

<set>

&lt;!&ndash; 日期转换器 &ndash;&gt;

<bean class=”com.cenobitor.converter.DateConverter” />

</set>

</property>

</bean>–>

<!– 配置多媒体解析器，用于上传等的配置，如果是纯文本则无需配置 –>

<!– 注意：这里的id只能是multipartResolver –>

<bean id=”multipartResolver” class=”org.springframework.web.multipart.commons.CommonsMultipartResolver”>

<!– 限定文件最大上传大小为：8MB –>

<property name=”maxUploadSize” value=”8388608″ />

</bean>

<!–可减少简写路径名–>

<!–<bean class=”org.springframework.web.servlet.view.InternalResourceViewResolver”>

&lt;!&ndash; 配置逻辑视图的前缀 &ndash;&gt;

<property name=”prefix” value=”/WEB-INF/views/”/>

<property name=”suffix” value=”.jsp”/>

</bean>–>

</beans>

（六） log4j 配置文件，位于resources包下：

log4j.rootLogger=DEBUG, Console

#Console

log4j.appender.Console=org.apache.log4j.ConsoleAppender

log4j.appender.Console.layout=org.apache.log4j.PatternLayout

log4j.appender.Console.layout.ConversionPattern=%d [%t] %-5p [%c] – %m%n

log4j.logger.java.sql.ResultSet=INFO

log4j.logger.org.apache=INFO

log4j.logger.java.sql.Connection=DEBUG

log4j.logger.java.sql.Statement=DEBUG

log4j.logger.java.sql.PreparedStatement=DEBUG

三、 图片上传预览

1、创建表以及pojo

CREATE TABLE `pic` (

`id` int(11) NOT NULL AUTO_INCREMENT,

`name` varchar(255) DEFAULT NULL,

`url` varchar(255) DEFAULT NULL,

PRIMARY KEY (`id`)

) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8

package com.cenobitor.pojo;

import lombok.Data;

/**

* @Description:

* @Date: Created in 11:05 AM 2018/5/1

* @Author: Cenobitor

* @Modified By:

*/

@Data

public class Pic {

private Integer id;

private String name;

private String url;

public Pic(String name, String url) {

this.name = name;

this.url = url;

}

public Pic() {

}

}

2、设置文件存储的虚拟路径

2、创建上传页面

<!DOCTYPE html>

<html>

<head>

<meta charset=”UTF-8″>

<title>上传图片</title>

</head>

<body>

<form id=”upload” action=”/uploadpic.action” method=”post” enctype=”multipart/form-data”>

<input type=”file” name=”picFile”/>

<br/>

<input type=”submit” value=”提交”/>

</form>

</body>

</html>

3、创建Controller类

package com.cenobitor.controller;

import com.cenobitor.service.UploadFileService;

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

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.*;

import org.springframework.web.multipart.MultipartFile;

@Controller

public class UploadFileController {

@Autowired

private UploadFileService uploadFileService;

//图片上传用MultipartFile接收文件,其中参数名要表单中的文件名一致

@RequestMapping(“/uploadpic”)

public String uploadPic(MultipartFile picFile) throws Exception {

String picUrl = uploadFileService.UploadPic(picFile);

if (picUrl == null){

return “redirect:error.html”;

}

//重定向预览图片

return “redirect:”+picUrl;

}

}

4、创建service层

public interface UploadFileService {

public String UploadPic(MultipartFile picFile);

}

package com.cenobitor.service.impl;

import com.cenobitor.mapper.PicMapper;

import com.cenobitor.pojo.Pic;

import com.cenobitor.service.UploadFileService;

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

import org.springframework.stereotype.Service;

import org.springframework.transaction.annotation.Transactional;

import org.springframework.web.multipart.MultipartFile;

import java.io.File;

import java.io.IOException;

import java.util.UUID;

@Service

@Transactional

public class UploadFileServiceImpl implements UploadFileService {

@Autowired

private PicMapper picMapper;

@Override

public String UploadPic(MultipartFile picFile) {

try {

// 图片新名字

String name = UUID.randomUUID().toString();

// 图片原名字

String oldName = picFile.getOriginalFilename();

// 后缀名

String exeName = oldName.substring(oldName.lastIndexOf(“.”));

//保存图片路径为绝对路径

File pic = new File(“/Users/Shared/jpg/” + name + exeName);

// 保存图片到本地磁盘

picFile.transferTo(pic);

//保存数据到数据库中

picMapper.add(new Pic(name,”../jpg/”+name+exeName));

return “/jpg/”+name+exeName;

} catch (IOException e) {

e.printStackTrace();

return null;

}

}

}

5、创建dao层（mapper层）

package com.cenobitor.mapper;

import com.cenobitor.pojo.Pic;

public interface PicMapper {

//添加图片

int add(Pic pic);

}

<?xml version=”1.0″ encoding=”UTF-8″ ?>

<!DOCTYPE mapper

PUBLIC “-//mybatis.org//DTD Mapper 3.0//EN”

“”>

<!–namespace为对应的mapper类的全路径名–>

<mapper namespace=”com.cenobitor.mapper.PicMapper”>

<!– 添加 –>

<!– id为对应的方法名, parameterType为入参的全路径名–>

<insert id=”add” parameterType = “com.cenobitor.pojo.Pic”>

insert into

pic(name,url)

values

(#{name},#{url});

</insert>

</mapper>

6、项目的目录结构

7、效果