1.前端准备
<%@ 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说明
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方式上传的文件，包含二进制数据+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 封装文件的上传路径
封装文件上传的路径，如果文件存在直接封装，如果文件不存在使用 file.mkdirs() 方法创建多级目录
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. 将接收到的文件传输到给定的目标文件。
try {
fileImage.transferTo(imageFile);//Transfer the received file to the given destination file.
}catch(IOException e){
e.printStackTrace();
}
