Maven工具之分模块构造SSM项目（附Demo源码）

最近搞了一下Maven依赖管理工具，今天更新一篇把Maven工具运用到SSM项目的博客（其实是为了水一篇文章 /捂脸/捂脸）。

阅读此博客需要一定的SSM框架（Spring、SpringMVC、Mybatis框架），以及Maven工具的知识，最好跟着做一遍操作。

注意：这里演示的是将mapper（dao）、service、web三层分为三个功能独立的模块。

一、创建根项目

1、创建项目maven_ssm_parent

删除src目录

2、在pom.xml中添加依赖

<!-- key-value指定形式 -->
<properties>
    <spring.version>5.0.2.RELEASE</spring.version>
    <springmvc.version>5.0.2.RELEASE</springmvc.version>
    <mybatis.version>3.4.5</mybatis.version>
</properties>
<!-- 锁定ssm三大框架的版本 -->
<dependencyManagement>
    <dependencies>
        <!-- Mybatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>${mybatis.version}</version>
        </dependency>
        <!-- springMVC -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>${springmvc.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <!-- spring -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-aop</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</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-aspects</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>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>${spring.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-tx</artifactId>
            <version>${spring.version}</version>
        </dependency>
    </dependencies>
</dependencyManagement>
<dependencies>
    <!-- Mybatis 和 mybatis 与 spring 的整合 -->
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis</artifactId>
    </dependency>
    <dependency>
        <groupId>org.mybatis</groupId>
        <artifactId>mybatis-spring</artifactId>
        <version>1.3.1</version>
    </dependency>
    <!-- MySql 驱动 -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.18</version>
    </dependency>
    <!-- druid 数据库连接池 -->
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.0.9</version>
    </dependency>
    <!-- springMVC -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>${springmvc.version}</version>
    </dependency>
    <!-- spring 相关 -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aop</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-expression</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-beans</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-aspects</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-context-support</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-test</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
    </dependency>
    <!-- spring 相关 事务相关 -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-jdbc</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-tx</artifactId>
    </dependency>
    <!-- junit 测试 -->
    <dependency>
        <groupId>junit</groupId>
        <artifactId>junit</artifactId>
        <version>4.12</version>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>servlet-api</artifactId>
        <version>2.5</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jsp-api</artifactId>
        <version>2.0</version>
        <scope>provided</scope>
    </dependency>
    <!-- jstl -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>jstl</artifactId>
        <version>1.2</version>
    </dependency>
</dependencies>
<!-- 配置tomcat插件、jdk版本 -->
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.1</version>
            <configuration>
                <target>1.8</target>
                <source>1.8</source>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.tomcat.maven</groupId>
            <artifactId>tomcat7-maven-plugin</artifactId>
            <version>2.2</version>
        </plugin>
    </plugins>
</build>

二、创建mapper子模块（也称dao层）

1、添加maven_ssm_mapper子模块

2、编写Java代码

①Product实体类

package cn.hestyle.demo.entity;

import java.io.Serializable;
import java.util.Date;

/**
 * description: Product实体类
 *
 * @author hestyle
 * @version 1.0
 * @className ssm_demo_01->Product
 * @date 2020-01-30 10:30
 **/
public class Product implements Serializable {
    private Integer id;
    /**商品名*/
    private String name;
    /**商品价格*/
    private Double price;
    /**商品库存数量*/
    private Integer number;
    /**商品简介*/
    private String info;
    /**商品照片路径*/
    private String picturePath;
    /**商品创建时间*/
    private Date createdTime;

    public Product() {
    }

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Double getPrice() {
        return price;
    }

    public void setPrice(Double price) {
        this.price = price;
    }

    public Integer getNumber() {
        return number;
    }

    public void setNumber(Integer number) {
        this.number = number;
    }

    public String getInfo() {
        return info;
    }

    public void setInfo(String info) {
        this.info = info;
    }

    public String getPicturePath() {
        return picturePath;
    }

    public void setPicturePath(String picturePath) {
        this.picturePath = picturePath;
    }

    public Date getCreatedTime() {
        return createdTime;
    }

    public void setCreatedTime(Date createdTime) {
        this.createdTime = createdTime;
    }

    @Override
    public String toString() {
        return "Product{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", price=" + price +
                ", number=" + number +
                ", info='" + info + '\'' +
                ", picturePath='" + picturePath + '\'' +
                ", createdTime=" + createdTime +
                '}';
    }
}

②ProductMapper接口类

package cn.hestyle.demo.mapper;


import cn.hestyle.demo.entity.Product;

import java.util.List;

/**
 * description: ProductMapper接口类，相当于IProductDao接口类
 *
 * @author hestyle
 * @version 1.0
 * @className ssm_demo_01->ProductMapper
 * @date 2020-01-30 10:36
 **/
public interface ProductMapper {
    /**
     * 保存product
     * @param product 待保存的product实体对象
     * @return 受影响的行数
     */
    public Integer save(Product product);

    /**
     * 更新product
     * @param product 待更新的product实体对象
     * @return 受影响的行数
     */
    public Integer update(Product product);

    /**
     * 通过id删除product
     * @param id 待删除的product实体对象id
     * @return 受影响的行数
     */
    public Integer deleteById(Integer id);

    /**
     * 通过id查找product
     * @param id 待删除的product实体对象id
     * @return 查找到的实体对象
     */
    public Product findById(Integer id);

    /**
     * 查找所有product
     * @return Product list
     */
    public List<Product> findAll();
}

3、编写配置文件

①、数据库配置文件db.properties

# MySQL数据库驱动
jdbc.driver=com.mysql.cj.jdbc.Driver
# ssm_demo_01数据库名称
jdbc.url=jdbc:mysql://localhost:3306/ssm_demo_01
# 连接数据库的账号、密码
jdbc.username=root
jdbc.password=123456

建表建库的脚本，拿到mysql图形化界面管理工具去执行

# 创建ssm_demo_01数据库
DROP DATABASE IF EXISTS `ssm_demo_01`;
CREATE DATABASE `ssm_demo_01`;
USE `ssm_demo_01`;
# 创建t_product表
CREATE TABLE `t_product`(
	`id` int PRIMARY KEY auto_increment,
	`name` VARCHAR(32) COMMENT '产品名称',
	`price` double COMMENT '产品价格',
	`number` int COMMENT '库存数量',
	`info` VARCHAR(200) COMMENT '产品简介',
	`picture_path` VARCHAR(100) COMMENT '产品照片路径',
	`created_time` date COMMENT '产品创建时间'
);
# 插入几条测试数据
INSERT INTO `t_product`(`name`,`price`,`number`,`info`,`picture_path`,`created_time`) 
VALUES('电脑','5000.5','50','性能吊打苹果！',NULL, now()),('手机','2000.9','20','性价比第一！',NULL, now()),('平板','32000.9','40','性能宇宙第一！',NULL, now());

②、mapper层spring配置文件applicationContext-dao.xml

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<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"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
		http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
		http://www.springframework.org/schema/context
		http://www.springframework.org/schema/context/spring-context-3.2.xsd
		http://www.springframework.org/schema/aop
		http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
		http://www.springframework.org/schema/tx
		http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">

    <!-- 1.加载db配置文件  -->
    <context:property-placeholder location="classpath:db.properties"/>

    <!-- 2.配置Druid数据源 -->
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="initialSize" value="1"/>
        <property name="maxActive" value="10"/>
        <property name="validationQuery" value="SELECT 1"/>
        <property name="removeAbandonedTimeout" value="5000"/>
    </bean>

    <!-- 3.让spring管理sqlsessionFactory -->
    <bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <!-- 指定映射文件位置 -->
        <property name="mapperLocations" value="classpath*:mappers/*.xml"/>
    </bean>

    <!-- 4.配置mapper扫描器.批量扫描创建代理对象 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="cn.hestyle.demo.mapper"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactoryBean"/>
    </bean>
</beans>

③、mapper映射文件（Mybatis）

<?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">
<!--
	namespace：命名空间，它的作用就是对SQL进行分类化管理，可以理解为SQL隔离
	注意：使用mapper代理开发时，namespace有特殊且重要的作用
 -->
<mapper namespace="cn.hestyle.demo.mapper.ProductMapper">
	<!--
	保存product对象， public Integer save(Product product);
        [id]：statement的id，要求在命名空间内唯一
        keyProperty="id" useGeneratedKeys="true"用于设置自动增长标识（id字段自动增长）
        [parameterType]：入参的java类型
     -->
	<insert id="save" keyProperty="id" useGeneratedKeys="true" parameterType="cn.hestyle.demo.entity.Product">
		INSERT INTO `t_product`(
			`name`, `price`, `number`, `info`, `picture_path`, `created_time`
		) VALUES (
			#{name},#{price},#{number},#{info},#{picturePath},#{createdTime}
		)
	</insert>

	<!--
	更新product对象， public Integer update(Product product);
        注意created_time不用更新，可以在表中增加一个modify_time字段,trim的作用是删除最后一个逗号
     -->
	<update id="update" parameterType="cn.hestyle.demo.entity.Product">
		UPDATE `t_product`
		<trim prefix="set" suffixOverrides=",">
			<if test="name != null">
				`name` = #{name},
			</if>
			<if test="price != null">
				`price` = #{price},
			</if>
			<if test="number != null">
				`number` = #{number},
			</if>
			<if test="info != null">
				`info` = #{info},
			</if>
			<if test="picturePath != null">
				`picture_path` = #{picturePath},
			</if>
		</trim>
		WHERE id = #{id}
	</update>

	<!--
	通过id删除product对象，public Integer deleteById(Integer id);
        注意这里可以不用真的删除，可以在表中增加一个is_del字段记录是否删除
     -->
	<delete id="deleteById" parameterType="java.lang.Integer">
		DELETE FROM `t_product`
		WHERE id = #{id}
	</delete>

    <!--
    通过id查找Product表, public Product findById(Integer id);
        由于表中的picture_path、created_time字段与Product实体类中的picturePath、createdTime属性不对应，所以需要手动指定映射关系
     -->
    <select id="findById" parameterType="java.lang.Integer" resultType="cn.hestyle.demo.entity.Product">
		SELECT `id`, `name`, `price`, `number`, `info`, `picture_path` picturePath, `created_time` createdTime
		FROM `t_product`
		WHERE id = #{id}
	</select>

	<!--
    查找product表所有记录，public List<Product> findAll();
        由于表中的picture_path、created_time字段与Product实体类中的picturePath、createdTime属性不对应，所以需要手动指定映射关系
        虽然指定的返回类型是Product，不过这里可能会查到多条数据，因此会自动转化成list
     -->
	<select id="findAll" resultType="cn.hestyle.demo.entity.Product">
		SELECT `id`, `name`, `price`, `number`, `info`, `picture_path` picturePath, `created_time` createdTime
		FROM `t_product`
	</select>
</mapper>

三、创建service子模块（也称service层）

1、添加maven_ssm_service子模块

2、将mapper层导入service依赖中

$\color{red}在maven_-ssm_-service中的pom.xml增加依赖，别选错文件！！！！$

<dependencies>
    <dependency>
        <groupId>cn.hestyle</groupId>
        <artifactId>maven_ssm_mapper</artifactId>
        <version>1.0-SNAPSHOT</version>
    </dependency>
</dependencies>

3、编写Java代码

①IProductService接口类

package cn.hestyle.demo.service;

import cn.hestyle.demo.entity.Product;

import java.util.List;

/**
 * description: IProductService接口类
 *
 * @author hestyle
 * @version 1.0
 * @className ssm_demo_01->IProductService
 * @date 2020-01-30 11:10
 **/
public interface IProductService {
    /**
     * 保存product
     * @param product 待保存的product实体对象
     * @return 受影响的行数
     */
    public Integer save(Product product);

    /**
     * 更新product
     * @param product 待更新的product实体对象
     * @return 受影响的行数
     */
    public Integer update(Product product);

    /**
     * 通过id删除product
     * @param id 待删除的product实体对象id
     * @return 受影响的行数
     */
    public Integer deleteById(Integer id);

    /**
     * 通过id查找product
     * @param id 待删除的product实体对象id
     * @return 查找到的实体对象
     */
    public Product findById(Integer id);

    /**
     * 查找所有product
     * @return Product list
     */
    public List<Product> findAll();
}

②ProductServiceImpl实现类

4、编写配置文件

①service层spring配置文件applicationContext-service.xml

<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"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
		http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
		http://www.springframework.org/schema/context
		http://www.springframework.org/schema/context/spring-context-3.2.xsd
		http://www.springframework.org/schema/aop
		http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
		http://www.springframework.org/schema/tx
		http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">

    <!-- 6.配置事务管理器 -->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>
    <!-- 7.开启事务注解-->
    <tx:annotation-driven></tx:annotation-driven>
    
    <context:component-scan base-package="cn.hestyle.demo.service"/>
</beans>

四、创建web子模块

1、添加maven_ssm_web子模块

2、添加service子模块依赖

$\color{red}修改maven_-ssm_-web中的pom.xml文件$

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>cn.hestyle</groupId>
    <artifactId>maven_ssm_web</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <dependencies>
        <dependency>
            <!-- web层依赖service层 -->
            <groupId>cn.hestyle</groupId>
            <artifactId>maven_ssm_service</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
            <scope>provided</scope>
        </dependency>
        <!-- springmvc处理上传文件依赖 -->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>
    </dependencies>
</project>

3、编写Java代码

①、新建src/main/java文件夹

②、新建ProductController类

package cn.hestyle.demo.web.controller;

import cn.hestyle.demo.entity.Product;
import cn.hestyle.demo.service.IProductService;
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 org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.util.Date;
import java.util.List;
import java.util.UUID;

/**
 * description: ProductController控制器
 *
 * @author hestyle
 * @version 1.0
 * @className ssm_demo_01->ProductController
 * @date 2020-01-30 11:19
 **/
@Controller
@RequestMapping("product")
public class ProductController {
    @Autowired
    private IProductService productService;

    @RequestMapping("add.do")
    public String add() {
        //跳转到/product/add.jsp页面
        return "/product/add";
    }

    @RequestMapping("save.do")
    public String save(Product product) {
        System.err.println("保存 " + product);
        product.setCreatedTime(new Date());
        productService.save(product);
        //保存product后，重定向到listAll
        return "redirect:listAll.do";
    }

    @RequestMapping("edit.do")
    public String edit(Integer id, Model model) {
        //通过model传入product到/product/edit.jsp页面
        Product product = productService.findById(id);
        System.err.println("通过id = " + id + "查找 " + product);
        model.addAttribute("product", product);
        return "/product/edit";
    }

    @RequestMapping("update.do")
    public String update(Product product) {
        System.err.println("更新" + product);
        productService.update(product);
        //保存更新后，重定向到/product/listAll.do
        return "redirect:listAll.do";
    }

    @RequestMapping("delete.do")
    public String delete(Integer id) {
        System.err.println("通过id = " + id + "删除");
        productService.deleteById(id);
        //删除product后，重定向到listAll
        return "redirect:listAll.do";
    }

    @RequestMapping("detail.do")
    public String detail(Integer id, Model model) {
        //通过model传入product到/product/detail.jsp页面
        Product product = productService.findById(id);
        System.err.println("通过id = " + id + "查找 " + product);
        model.addAttribute("product", product);
        return "/product/detail";
    }

    @RequestMapping("listAll.do")
    public String listAll(Model model) {
        //通过model传入productList到/product/listAll.jsp页面
        List<Product> productList = productService.findAll();
        System.err.println("查找所有product " + productList);
        model.addAttribute("productList", productList);
        return "/product/listAll";
    }

    @RequestMapping("uploadPicture.do")
    public void uploadPicture(MultipartFile pictureFile, HttpServletRequest request, HttpServletResponse response) throws IOException {
        response.setHeader("contentType", "text/json,charset=utf-8");
        // 1、判断文件是否为空，空则返回失败页面
        if (pictureFile.isEmpty()) {
            response.getWriter().write("{\"code\":500,\"msg\":\"文件为空！\"}");
            return;
        }
        // 2、获取文件存储路径（绝对路径）
        String path = request.getServletContext().getRealPath("/picture/product");
        // 获取原文件扩展名
        String[] tempStrings = pictureFile.getOriginalFilename().split("\\.");
        String suffix = tempStrings[tempStrings.length - 1].toLowerCase();
        if (!"png".equals(suffix) && !"jpg".equals(suffix) && !"jpeg".equals(suffix) ) {
            response.getWriter().write("{\"code\":500,\"msg\":\"只允许上传png、jpg、jpeg格式的文件！\"}");
            return;
        }
        String fileName = UUID.randomUUID().toString() + "." + suffix;
        // 3、创建文件实例
        File filePath = new File(path, fileName);
        // 如果文件目录不存在，创建目录
        if (!filePath.getParentFile().exists()) {
            filePath.getParentFile().mkdirs();
        }
        System.err.println("创建文件" + filePath.getAbsolutePath());
        // 4、写入文件
        pictureFile.transferTo(filePath);
        // 5、把文件存放的项目相对路径返回
        response.getWriter().write("{\"code\":200,\"msg\":\"/picture/product/" + fileName + "\"}");
    }
}

4、导入JQuery库

5、编写前端页面

①add.jsp页面

<%--
  Created by IntelliJ IDEA.
  User: hestyle
  Date: 2020/1/30
  Time: 11:39
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>添加产品</title>
    <script src="${pageContext.request.contextPath}/js/jquery-1.8.3.js"></script>
    <script>
        function upload() {
            //从id=pictureFile的input标签获取选中的文件，然后组成form，提交到uploadPicture.do
            var pictureForm = new FormData();
            pictureForm.append("pictureFile", document.getElementById("pictureFile").files[0]);
            $.ajax({
                "url" : "${pageContext.request.contextPath}/product/uploadPicture.do",
                "data" : pictureForm,
                "type" : "POST",
                "contentType": false,/*上传文件必须要的*/
                "processData": false,/*上传文件必须要的*/
                "dataType" : "json",
                "success" : function (json) {
                    if (json.code === 200) {
                        //如果提交成功，则把返回的上传到服务器图片路径设置到picturePath标签
                        $("input[name='picturePath']").val(json.msg);
                    } else {
                        alert(json.msg);
                        $("input[name='picturePath']").val("");
                    }

                },
                "error" :function () {
                    alert("出错!");
                }
            });
        }
    </script>
</head>
<body>
    <!-- 以post请求方式，发送请求给product/save.do -->
    <form action="${pageContext.request.contextPath}/product/save.do" method="post">
        <table border="1">
            <tr>
                <td>产品名</td>
                <td><input type="text" name="name"></td>
            </tr>
            <tr>
                <td>产品价格</td>
                <td><input type="text" name="price"></td>
            </tr>
            <tr>
                <td>库存数量</td>
                <td><input type="text" name="number"></td>
            </tr>
            <tr>
                <td>产品简介</td>
                <td><textarea name="info"></textarea></td>
            </tr>
            <tr>
                <td>产品照片<input type="text" name="picturePath" value="" hidden></td>
                <!-- 当选择的照片发生了变化，调用upload()方法，上传图片到服务器 -->
                <td><input type="file" id="pictureFile" onchange="upload()" accept=".jpg, .jpeg, .png"></td>
            </tr>
            <tr>
                <td colspan="2"><input type="submit" value="添加" align="center"></td>
            </tr>
        </table>
    </form>
</body>
</html>

②detail.jsp页面

<%--
  Created by IntelliJ IDEA.
  User: hestyle
  Date: 2020/1/30
  Time: 15:08
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>产品详情</title>
</head>
    <body>
        <table border="1">
            <tr>
                <td>产品编号</td>
                <td><input type="text" name="name" readonly value="${product.id}"></td>
            </tr>
            <tr>
                <td>产品名称</td>
                <td><input type="text" name="name" readonly value="${product.name}"></td>
            </tr>
            <tr>
                <td>产品价格</td>
                <td><input type="text" name="price" readonly value="${product.price}"></td>
            </tr>
            <tr>
                <td>库存数量</td>
                <td><input type="text" name="number" readonly value="${product.number}"></td>
            </tr>
            <tr>
                <td>产品简介</td>
                <td><textarea name="info" cols="20" rows="5" readonly>${product.info}</textarea></td>
            </tr>
            <tr>
                <td>产品照片</td>
                <td><img src="${pageContext.request.contextPath}/${product.picturePath}" width="80px" height="80px"></td>
            </tr>
            <tr>
                <td>创建时间</td>
                <td>${product.createdTime}</td>
            </tr>
        </table>
    </body>
</html>

③edit.jsp页面

<%--
  Created by IntelliJ IDEA.
  User: hestyle
  Date: 2020/1/30
  Time: 15:08
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>产品详情</title>
</head>
    <body>
        <form method="post" action="${pageContext.request.contextPath}/product/update.do">
            <table border="1">
                <tr>
                    <td>产品编号</td>
                    <td><input type="text" name="id" value="${product.id}" readonly></td>
                </tr>
                <tr>
                    <td>产品名称</td>
                    <td><input type="text" name="name" value="${product.name}"></td>
                </tr>
                <tr>
                    <td>产品价格</td>
                    <td><input type="text" name="price" value="${product.price}"></td>
                </tr>
                <tr>
                    <td>库存数量</td>
                    <td><input type="text" name="number" value="${product.number}"></td>
                </tr>
                <tr>
                    <td>产品简介</td>
                    <td><textarea name="info" cols="20" rows="5">${product.info}</textarea></td>
                </tr>
                <tr>
                    <td>产品照片</td>
                    <td><img src="${pageContext.request.contextPath}/${product.picturePath}" width="80px" height="80px"></td>
                </tr>
                <tr>
                    <td rowspan="2" align="center"><input type="submit" value="保存"></td>
                </tr>
            </table>
        </form>
    </body>
</html>

④listAll.jsp页面

<%--
  Created by IntelliJ IDEA.
  User: hestyle
  Date: 2020/1/30
  Time: 11:39
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="jstl" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>所有产品列表</title>
</head>
<body>
    <table border="1">
        <tr>
            <td>产品编号</td>
            <td>产品名称</td>
            <td>产品价格</td>
            <td>库存数量</td>
            <td>产品简介</td>
            <td>产品照片</td>
            <td>创建时间</td>
            <td>相关操作</td>
        </tr>
        <!-- 需要在导入jstl.jar依赖，并且在顶端导入jstl的uri才能使用forEach标签 -->
        <jstl:forEach items="${productList}" var="product">
            <tr>
                <td>${product.id}</td>
                <td><a href="${pageContext.request.contextPath}/product/detail.do?id=${product.id}">${product.name}</a></td>
                <td>${product.price}</td>
                <td>${product.number}</td>
                <td>${product.info}</td>
                <td><img src="${pageContext.request.contextPath}/${product.picturePath}" width="50px" height="50px"></td>
                <td>${product.createdTime}</td>
                <td>
                    <a href="${pageContext.request.contextPath}/product/edit.do?id=${product.id}">编辑</a>
                    &nbsp<a href="${pageContext.request.contextPath}/product/delete.do?id=${product.id}">删除</a>
                </td>
            </tr>
        </jstl:forEach>
    </table>
</body>
</html>

6、编写配置文件

①、新建resources文件夹

②、添加web层spring配置文件applicationContext.xml

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

    <!-- 直接导入mapper、service层spring配置文件 -->
    <import resource="classpath:applicationContext-dao.xml"/>
    <import resource="classpath:applicationContext-service.xml"/>
</beans>

③、添加springmvc配置文件springmvc.xml

<?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:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
      http://www.springframework.org/schema/mvc
      http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd
      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context-3.2.xsd
      http://www.springframework.org/schema/aop
      http://www.springframework.org/schema/aop/spring-aop-3.2.xsd
      http://www.springframework.org/schema/tx
      http://www.springframework.org/schema/tx/spring-tx-3.2.xsd">

    <!-- 1.配置注解扫描位置 -->
    <context:component-scan base-package="cn.hestyle.demo.web.controller" />


    <!-- 2.配置注解处理映射-->
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>

    <!--3.配置适配器-->
    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">

    </bean>

    <!-- 4.配置springmvc视图解析器 视图解析器解析的视频路径为：前缀 + 后缀 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views" />
        <property name="suffix" value=".jsp" />
    </bean>

    <!-- 5.配置springmvc文件处理 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 设置上传图片文件的大小 单位为Byte 5M=1024*1024*5 -->
        <property name="maxUploadSize" value="5242880"/>
    </bean>
</beans>

④、日志输出文件log4j.properties

# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

⑤修改web.xml文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">

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

    <!-- 1、配置spring mvc DispatcherServlet -->
    <servlet>
        <servlet-name>DispatcherServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 3.0的spring mvc 默认加载WEB-INF下的dispatcher-servlet.xml文件 3.2的spring mvc
            加载DispatcherServlet-servlet.xml文件 -->
        <init-param>
            <!-- 修改黑底spring mvc加载的配置文件路径 -->
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:springmvc.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>DispatcherServlet</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

    <!-- 2、spring的配置 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- 3、配置编码过滤器（防止中文乱码）  -->
    <filter>
        <filter-name>EncodingFilter</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>EncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

五、启动项目

成功启动



$\color{red}Demo源码地址：$
地址一：https://pan.baidu.com/s/1z9zjQbIAPyr4NoNPYRo82w 提取码: erhb
地址二：https://pan.baidu.com/s/1PhnMNpQXnChJE86WvPz5lw 提取码: h16v
地址三：https://pan.baidu.com/s/1Wh9xBNWsFwkwi3Byt9Puqg 提取码: sntp

$\color{red}博客推荐：$
Spring、SpringMVC、Mybatis框架整合（IDEA）(附Demo)
Maven工具之创建第一个项目
Maven工具之快速入门（此篇绝对足够！）

以上就是Maven工具之分模块构造SSM项目（附Demo源码）主要内容，主要是演示操作过程，喜欢的可以点个赞哟~