1.准备工作
1、新建一个SpringBoot项目加上web依赖, 所有依赖
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-webartifactId>
dependency>
<dependency>
<groupId>org.thymeleafgroupId>
<artifactId>thymeleaf-spring5artifactId>
dependency>
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>
dependency>
2、application.properties
# 上传文件总的最大值
spring.servlet.multipart.max-request-size=10MB
#spring.servlet.multipart.max-request-size=10KB
# 单个文件的最大值
spring.servlet.multipart.max-file-size=10MB
#spring.servlet.multipart.max-file-size=10KB
# 文件上传路径
pro.uploadPath=/uploadFile
#spring.resources.static-locations = classpath:/META-INF/resources/,classpath:/resources/,classpath:/static/,classpath:/public/,classpath:/uploadFile/
3、新建文件上传的静态文件 index.html
<html lang="en">
<head>
<meta charset="UTF-8">
<title>文件上传title>
head>
<body>
<h1>单文件上传h1>
<form method="post" action="/file/upload" enctype="multipart/form-data">
<input type="file" name="file"><br>
<input type="submit" value="提交">
form>
<h1>传统手艺文件上传h1>
<form method="post" action="/upload" enctype="multipart/form-data">
<input type="file" name="file"><br>
<input type="submit" value="提交">
form>
<h1>多文件上传h1>
<form method="post" action="/uploads" enctype="multipart/form-data">
<input type="file" name="file"><br>
<input type="file" name="file"><br>
<input type="submit" value="提交">
form>
body>
html>
2.文件上传代码
package com.pro.controller;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.util.ResourceUtils;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import javax.servlet.http.HttpServletRequest;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.*;
@RestController
public class UploadController {
@Value("${pro.uploadPath}")
private String uploadPath;
public final static String UPLOAD_PATH_PREFIX = "src/main/resources/static";
public String getUploadPath(HttpServletRequest request, String fileName) {
return request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + uploadPath + "/" + fileName;
}
@GetMapping("/hello")
public String hello(HttpServletRequest request) {
System.out.println("uploadPath --> " + uploadPath);
System.out.println("上下文2 --> " + request.getServletContext().getRealPath("/file"));
File file = new File(UPLOAD_PATH_PREFIX);
System.out.println("UPLOAD_PATH_PREFIX 路径: " + file.getAbsoluteFile());
try {
String path = ResourceUtils.getURL("classpath:").getPath();
System.out.println("ResourceUtils.getURL.getPath --> " + path);
System.out.println("当前项目的绝对路径 --> " + new File("").getAbsolutePath());
System.out.println("upload 绝对路径 --> " + new File("upload").getAbsolutePath());
System.out.println("/upload 绝对路径 --> " + new File("/upload").getAbsolutePath());
System.out.println("./upload 绝对路径 --> " + new File("./upload").getAbsolutePath());
} catch (FileNotFoundException e) {
e.printStackTrace();
}
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
String format = simpleDateFormat.format(new Date());
return format;
}
@RequestMapping("/file/upload")
public Object fileUpload(@RequestParam("file") MultipartFile multipartFile, HttpServletRequest request) {
Map<String, Object> map = new HashMap();
map.put("msg", "上传成功");
if (multipartFile.isEmpty()) {
map.put("msg", "空文件");
return map;
}
String fileName = multipartFile.getOriginalFilename();
if ("".equals(fileName)) {
map.put("msg", "文件名不能为空");
return map;
}
System.out.println("上传文件原始的名字: " + fileName);
String newFileName = UUID.randomUUID().toString().replaceAll("-", "") + fileName.substring(fileName.lastIndexOf("."), fileName.length());
System.out.println("保存的文件的新名字: " + newFileName);
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
String format = simpleDateFormat.format(new Date());
File readPath = new File(UPLOAD_PATH_PREFIX + uploadPath + File.separator + format);
System.out.println("存放的文件夹: " + readPath);
System.out.println("存放文件的绝对路径: " + readPath.getAbsolutePath());
if (!readPath.isDirectory()) {
readPath.mkdirs();
}
File file = new File(readPath.getAbsolutePath() + File.separator + newFileName);
try {
multipartFile.transferTo(file);
String filePath = getUploadPath(request, format + "/" + newFileName);
map.put("path", filePath);
} catch (IOException e) {
e.printStackTrace();
map.put("msg", "上传失败");
}
return map;
}
@PostMapping("/upload")
public Object upload(@RequestParam("file") MultipartFile multipartFile) {
Map<String, Object> map = new HashMap();
map.put("msg", "上传成功");
if (multipartFile.isEmpty()) {
return "文件不能为空";
}
String fileName = multipartFile.getOriginalFilename();
if ("".equals(fileName)) {
return "文件名不能为空";
}
System.out.println("文件名: " + fileName);
File readPath = new File(UPLOAD_PATH_PREFIX + uploadPath + File.separator + "temp");
if (!readPath.isDirectory()) {
readPath.mkdirs();
}
System.out.println("保存路径: " + readPath);
InputStream is = null;
FileOutputStream os = null;
try {
is = multipartFile.getInputStream();
os = new FileOutputStream(new File(readPath, fileName));
int len = 0;
byte[] bytes = new byte[1024];
while ((len = is.read(bytes)) != -1) {
os.write(bytes, 0, len);
}
} catch (IOException e) {
e.printStackTrace();
map.put("msg", "上传失败");
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return map;
}
@PostMapping("/uploads")
public String uploads(HttpServletRequest request) {
List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file");
for (MultipartFile file : files) {
if (file.isEmpty()) {
return file.getOriginalFilename() + "上传失败";
}
File readPath = new File(UPLOAD_PATH_PREFIX + uploadPath + File.separator + "temps");
System.out.println("多文件上传的位置: " + readPath);
System.out.println("多文件上传的绝对路径: " + readPath.getAbsolutePath());
if (!readPath.isDirectory()) {
readPath.mkdirs();
}
File dest = new File(readPath.getAbsolutePath() + File.separator + file.getOriginalFilename());
try {
file.transferTo(dest);
} catch (IOException e) {
e.printStackTrace();
return file.getOriginalFilename() + "上传失败";
}
}
return "上传成功";
}
}
提供CDN加速