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在JSP中處理文件上傳,通常需要以下幾個步驟:
enctype
屬性為multipart/form-data
。這允許用戶在表單中選擇文件進行上傳。<form action="upload.jsp" method="post" enctype="multipart/form-data">
選擇要上傳的文件:
<input type="file" name="file" />
<input type="submit" value="上傳" />
</form>
FileUploadServlet
,并在其doPost
方法中處理文件上傳。import java.io.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
@WebServlet("/upload")
@MultipartConfig(fileSizeThreshold = 1024 * 1024 * 2, // 2MB
maxFileSize = 1024 * 1024 * 10, // 10MB
maxRequestSize = 1024 * 1024 * 50) // 50MB
public class FileUploadServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
private static final String UPLOAD_DIRECTORY = "uploads";
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Part filePart = request.getPart("file");
String fileName = getSubmittedFileName(filePart);
String filePath = getServletContext().getRealPath("") + File.separator + UPLOAD_DIRECTORY;
File uploadDir = new File(filePath);
if (!uploadDir.exists()) {
uploadDir.mkdir();
}
try {
InputStream fileContent = filePart.getInputStream();
File file = new File(filePath + File.separator + fileName);
OutputStream out = new FileOutputStream(file);
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = fileContent.read(buffer)) != -1) {
out.write(buffer, 0, bytesRead);
}
out.close();
fileContent.close();
response.sendRedirect("success.jsp");
} catch (Exception e) {
e.printStackTrace();
response.sendRedirect("error.jsp");
}
}
private String getSubmittedFileName(Part part) {
for (String content : part.getHeader("content-disposition").split(";")) {
if (content.trim().startsWith("filename")) {
return content.substring(content.indexOf('=') + 1).trim().replace("\"", "");
}
}
return null;
}
}
success.jsp
:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>文件上傳成功</title>
</head>
<body>
<h1>文件上傳成功!</h1>
<p>您選擇的文件已經成功上傳。</p>
</body>
</html>
error.jsp
:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>文件上傳失敗</title>
</head>
<body>
<h1>文件上傳失敗!</h1>
<p>抱歉,文件上傳過程中出現了問題。請稍后重試。</p>
</body>
</html>
現在,當用戶通過表單選擇文件并提交時,FileUploadServlet
將處理文件上傳并將其保存到服務器的指定目錄。根據上傳結果,用戶將被重定向到成功或錯誤頁面。
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