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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();
}
正文完
发表至: springboot
2020-09-11