关于上传文件的问题

同学你好，如下给出一种SpringMVC使用form表单上传文件：

实体类Goods:

public class Goods {
    private String goodsId;
    private String goodsName;
    private String path;
    private int price;
    private String desc;

    public Goods(String goodsId, String goodsName, String path, int price, String desc) {
        this.goodsId = goodsId;
        this.goodsName = goodsName;
        this.path = path;
        this.price = price;
        this.desc = desc;
    }

    public Goods() {
    }

    public String getGoodsId() {
        return goodsId;
    }

    public void setGoodsId(String goodsId) {
        this.goodsId = goodsId;
    }

    public String getGoodsName() {
        return goodsName;
    }

    public void setGoodsName(String goodsName) {
        this.goodsName = goodsName;
    }

    public String getPath() {
        return path;
    }

    public void setPath(String path) {
        this.path = path;
    }

    public float getPrice() {
        return price;
    }

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

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    @Override
    public String toString() {
        return "Goods{" +
                "goodsId='" + goodsId + '\'' +
                ", goodsName='" + goodsName + '\'' +
                ", path='" + path + '\'' +
                ", price=" + price +
                ", desc='" + desc + '\'' +
                '}';
    }
}

配置文件applicatiocontext.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: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/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">

  

    <mvc:annotation-driven />

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/views/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding">
            <value>UTF-8</value>
        </property>
        <property name="maxUploadSize">
            <value>32505856</value>
        </property>
        <property name="maxInMemorySize">
            <value>4096</value>
        </property>
    </bean>
</beans>

控制器类GoodsController：

import com.imooc.entity.Goods;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

@Controller
public class GoodsController {
    @GetMapping("/toadd")
    public String toAdd(){
        return "addGoods";
    }

    @PostMapping("/addGoods")
    public String addGoods(@RequestParam("goodsId") String goodsId, @RequestParam("goodsName") String goodsName,
                             @RequestParam("path") MultipartFile path, @RequestParam("price") String price,
                             @RequestParam("desc") String desc, HttpServletRequest request) {
        Goods goods = new Goods();
        goods.setGoodsId(goodsId);
        goods.setGoodsName(goodsName);
        goods.setPrice(Integer.valueOf(price));
        goods.setDesc(desc);
        // 判断文件是否存在
        if (!path.isEmpty()) {
            // 循环输出上传文件
            // 获取原始的文件名称
            String originalFilename = path.getOriginalFilename();
            // 设置上传文件的保存目录
            String uploadPath = request.getServletContext().getRealPath("/upload/");
            File filePath = new File(uploadPath);
            System.out.println(uploadPath);
            if (!filePath.exists()) {
                // 如果目录不存在就创建
                filePath.mkdir();
            }
            String newFileName = getRandomFileName() + "_" + originalFilename;
            try {
                path.transferTo(new File(filePath + "\\" + newFileName));
                System.out.println(filePath + "\\" + newFileName);
            } catch (IOException e) {
                e.printStackTrace();
            }
            goods.setPath(filePath + "\\" + newFileName);
        }
        System.out.println(goods);
        return "success";
    }


    public static String getRandomFileName() {
        Random r = new Random();
        SimpleDateFormat sDateFormat = new SimpleDateFormat("yyyyMMddHHmmss");
        // 获取随机的五位数
        int rannum = r.nextInt(89999) + 10000;
        String nowTimeStr = sDateFormat.format(new Date());
        return nowTimeStr + rannum;
    }

}

添加商品的jsp页面：

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <form action="${pageContext.request.contextPath}/addGoods" method="post" enctype="multipart/form-data">
        商品Id：  <input type="text" name="goodsId" id="goodsId"><br/>
        商品名称： <input type="text" name="goodsName" id="goodsName"><br/>
        商品图片：<input type="file" name="path" id="path"><br/>
        商品价格：<input type="text" name="price" id="price"><br/>
        商品描述：<input type="text" name="desc" id="desc"><br/>
    <input type="submit" value="提交">
    </form>

</body>
</html>

web.xml配置：

<web-app>
  <display-name>Archetype Created Web Application</display-name>

  <servlet>
    <servlet-name>SpringMVC</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:applicationcontext.xml</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>SpringMVC</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

项目结构：

添加商品后，target目录下的upload会出现上传的文件。

祝：学习愉快~