springboot系列16：檔案上傳
阿新 • • 發佈：2022-01-13
檔案上傳用到的場景也比較多，如頭像的修改、相簿應用、附件的管理等等，今天就來學習下在springboot框架下應用檔案上傳技術。
1、pom 配置
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
</dependencies>
2、application.properties配置上傳檔案的大小
spring.servlet.multipart.max-file-size=10MB spring.servlet.multipart.max-request-size=10MB
3、上傳頁面
<!DOCTYPE html>
<html xmlns:th="http://www.thymeleaf.org">
<body>
<h1>Spring Boot file upload example</h1>
<form method="POST" action="/upload" enctype="multipart/form-data">
<input type="file" name="file" /><br/><br/>
<input type="submit" value="上傳" />
</form>
</body>
</html>
4、上傳結果頁面
<!DOCTYPE html>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<body>
<h1>SpringBoot - 檔案上傳結果</h1>
<div th:if="${message}">
<h2 th:text="${message}"/>
</div>
</body>
</html>
5、上傳檔案controller
@Controller
public class UploadController {
private static String UPLOADED_FOLDER = "E://temp//";
@GetMapping("/")
public String index() {
return "index";
}
@PostMapping("/upload")
public String singleFileUpload(@RequestParam("file") MultipartFile file,
RedirectAttributes redirectAttributes) {
if (file.isEmpty()) {
redirectAttributes.addFlashAttribute("message", "請選擇一個檔案上傳");
return "redirect:uploadStatus";
}
try {
byte[] bytes = file.getBytes();
File pathFile = new File(UPLOADED_FOLDER);
if (!pathFile.exists()){
pathFile.mkdirs();
}
Path path = Paths.get(UPLOADED_FOLDER + file.getOriginalFilename());
Files.write(path, bytes);
redirectAttributes.addFlashAttribute("message",
"檔案上傳成功：'" + file.getOriginalFilename() + "'");
} catch (IOException e) {
e.printStackTrace();
}
return "redirect:/result";
}
@GetMapping("/result")
public String result() {
return "result";
}
}