实现Java文件上传后删除的流程步骤

1. 上传文件

2. 保存文件

3. 下载文件

4. 删除文件

1. 上传文件

// 通过表单提交的方式上传文件
<form action="uploadFile" method="post" enctype="multipart/form-data">
    Select file to upload:
    <input type="file" name="file" id="file">
    <input type="submit" value="Upload File" name="submit">
</form>

2. 保存文件

// 保存文件到服务器指定路径
String uploadPath = "C:/uploads";
Part filePart = request.getPart("file");
String fileName = Paths.get(filePart.getSubmittedFileName()).getFileName().toString();
File file = new File(uploadPath + File.separator + fileName);
try (InputStream input = filePart.getInputStream()) {
    Files.copy(input, file.toPath(), StandardCopyOption.REPLACE_EXISTING);
}

3. 下载文件

// 下载文件
String filePath = "C:/uploads/fileName.txt";
File file = new File(filePath);
response.setHeader("Content-Disposition", "attachment; filename=" + file.getName());
InputStream inputStream = new FileInputStream(file);
OutputStream outputStream = response.getOutputStream();
byte[] buffer = new byte[4096];
int bytesRead = -1;
while ((bytesRead = inputStream.read(buffer)) != -1) {
    outputStream.write(buffer, 0, bytesRead);
}

4. 删除文件

// 删除文件
String filePath = "C:/uploads/fileName.txt";
File file = new File(filePath);
if (file.delete()) {
    System.out.println("File deleted successfully");
} else {
    System.out.println("Failed to delete the file");
}

类图

classDiagram
    FileUploader --|> File
    FileUploader : +uploadFile()
    FileUploader : +saveFile()
    FileUploader : +downloadFile()
    FileUploader : +deleteFile()

饼状图

pie
    title File Operations
    "Upload" : 25
    "Save" : 25
    "Download" : 25
    "Delete" : 25

通过以上步骤，你可以轻松实现Java文件上传后删除的功能，只需要按照流程逐步进行即可。希望对你有所帮助，加油！