1.前端筹备
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> </head> <body> <h1>实现文件长传</h1> <!--enctype="开启多媒体标签" --> <form action="http://localhost:8091/filetest" method="post" enctype="multipart/form-data"> <input name="fileImage" type="file" /> <input type="submit" value="提交"/> </form> </body> </html>2.实现文件上传的步骤阐明
package com.jt.controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.multipart.MultipartFile; import java.io.File; import java.io.IOException; @RestController public class FileTestController { @RequestMapping("/filetest") public String file(MultipartFile fileImage){ String fileDir = "F:/CloudMusic/images"; File file = new File(fileDir); if(!file.exists()){ file.mkdirs(); } String fileName = fileImage.getOriginalFilename(); File imageFile = new File(fileDir+"/"+fileName); try { fileImage.transferTo(imageFile);//Transfer the received file to the given destination file. }catch(IOException e){ e.printStackTrace(); } return "ok"; } }3.代码解释
3.1 前提
MultipartFile是spring类型，代表HTML中form data形式上传的文件，蕴含二进制数据+文件名称。
public String file(MultipartFile fileImage){} <form action="http://localhost:8091/filetest" method="post" enctype="multipart/form-data"> <input name="fileImage" type="file" /> <input type="submit" value="提交"/> </form> 3.2 封装文件的上传门路
封装文件上传的门路，如果文件存在间接封装，如果文件不存在应用file.mkdirs() 办法创立多级目录
String fileDir = "F:/CloudMusic/images"; File file = new File(fileDir); if(!file.exists()){ file.mkdirs(); } 3.3 封装文件的名称
fileImage.getOriginalFilename()//Return the original filename in the client's filesystem. 返回客户端文件系统中的原始文件名。
String fileName = fileImage.getOriginalFilename(); File imageFile = new File(fileDir+"/"+fileName); 3.4 文件的上传
fileImage.getOriginalFilename()//Transfer the received file to the given destination file. 将接管到的文件传输到给定的指标文件。
try { fileImage.transferTo(imageFile);//Transfer the received file to the given destination file. }catch(IOException e){ e.printStackTrace(); }