传统方式上传文件

//第一步：导入依赖jar包

<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>

//编写jsp页面发送上传请求

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
 <title>Title</title>
</head>
<body>
<h3>文件上传</h3>
<%--<a href="user/fileUpload1">文件上传1</a>--%>
<form action="user/fileUpload1" method="post" enctype="multipart/form-data" >
 选择文件:<input type="file" name="upload"/><br/>
 <input type="submit" value="上传">
</form>
</body>
</html>

//编写后台上传方法

package com.hope.controller;

import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

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

/**
 * @author newcityman
 * @date 2019/11/28 - 13:04
 */
@Controller("userController")
@RequestMapping(path = "/user")
public class UserController {
 @RequestMapping(path = "/fileUpload1")
 public String fileUpload1(HttpServletRequest request) throws Exception {
 System.out.println("文件上传。。。。");
 //使用fileupload组件完成文件上传
 //获取上传的位置
 String path = request.getSession().getServletContext().getRealPath("/uploads/");
 //判断，路径是否存在
 File file = new File(path);
 if(!file.exists()){
 //创建该文件夹
 file.mkdirs();
 }
 //解析request对象，获取上传文件项
 DiskFileItemFactory factory = new DiskFileItemFactory(); //磁盘文件项工厂
 ServletFileUpload upload = new ServletFileUpload(factory);

 //解析rquest
 List<FileItem> items = upload.parseRequest(request);
 for(FileItem item:items){
 //判断当前文件是否是上传文件项
 if(item.isFormField()){
 //说明文件是普通文件项
 }else{
 //说明是上传文件项
 //获取上传文件的名称
 String fileName = item.getName();
 String uuid = UUID.randomUUID().toString().replace("-","");
 fileName=uuid+fileName;
 //完成文件上传
 item.write(new File(path,fileName));
 //删除临时文件
 item.delete();
 }
 }
 return "success";
 }

}

传统方式上传文件

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