配置pom.xml依赖
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>辅助类
该辅助类提供了文件上传后存储在本机的位置。
public class PathUtil {
public static String uploadPath="E:/Jsource/FilePath/";
}Controller
@GetMapping("/upload")
public String uploadByGet(){
return "upload";
}
@GetMapping("/uploads")
public String uploadsByGet(){
return "uploads";
}
@PostMapping("/upload")
public String uploadByPost(Model model,
@RequestParam("file") MultipartFile file){
if (!file.isEmpty()) {
try{
String filePath=PathUtil.uploadPath+file.getOriginalFilename();
BufferedOutputStream out=new BufferedOutputStream(
new FileOutputStream(new File(filePath)));
out.write(file.getBytes());
out.flush();
out.close();
model.addAttribute("msg", "上传文件成功");
}
catch(Exception e){
e.printStackTrace();
model.addAttribute("msg", "上传文件失败："+e.getMessage());
}
}
else{
model.addAttribute("msg", "上传文件失败：文件为空");
}
return "upload";
}
@PostMapping("/uploads")
public String uploadsByPost(Model model,HttpServletRequest request){
List<MultipartFile> files=((MultipartHttpServletRequest)request).getFiles("file");
for(MultipartFile file:files){
if (!file.isEmpty()) {
try{
String filePath=PathUtil.uploadPath+file.getOriginalFilename();
BufferedOutputStream out=new BufferedOutputStream(
new FileOutputStream(new File(filePath)));
out.write(file.getBytes());
out.flush();
out.close();
model.addAttribute("msg", "上传文件成功");
}
catch(Exception e){
e.printStackTrace();
model.addAttribute("msg", "上传文件失败："+e.getMessage());
}
}
else{
model.addAttribute("msg", "上传文件失败：文件为空");
}
}
return "uploads";
}上传页面
upload.html：单文件上传页面
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<title>上传单文件</title>
</head>
<span th:text="${msg}"></span>
<body>
<form method="POST" enctype="multipart/form-data" action="/upload">
<p>
文件：<input type="file" name="file" />
</p>
<p>
<input type="submit" value="上传" />
</p>
</form>
</body>
</html>uploads.html：多文件上传页面
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<head>
<title>上传多文件</title>
</head>
<span th:text="${msg}"></span>
<body>
<form method="POST" enctype="multipart/form-data" action="/uploads">
<p>
文件1：<input type="file" name="file" />
</p>
<p>
文件2：<input type="file" name="file" />
</p>
<p>
文件3：<input type="file" name="file" />
</p>
<p>
<input type="submit" value="上传" />
</p>
</form>
</body>
</html>限制文件上传大小
package com.example.mysite.configuration;
import javax.servlet.MultipartConfigElement;
import org.springframework.boot.web.servlet.MultipartConfigFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class UploadFileConfiguration {
@Bean
public MultipartConfigElement multipartConfigElement(){
MultipartConfigFactory factory=new MultipartConfigFactory();
factory.setMaxFileSize("256KB");
factory.setMaxRequestSize("512KB");
return factory.createMultipartConfig();
}
}演示
上传单文件
上传成功
上传多文件
上传成功
