在JSP中处理文件上传，通常需要以下几个步骤：
enctype属性为multipart/form-data。这允许用户在表单中选择文件进行上传。<form action="upload.jsp" method="post" enctype="multipart/form-data">
选择要上传的文件：
<input type="file" name="file" />
<input type="submit" value="上传" />
</form>
FileUploadServlet，并在其doPost方法中处理文件上传。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>文件上传成功</title>
</head>
<body>
<h1>文件上传成功！</h1>
<p>您选择的文件已经成功上传。</p>
</body>
</html>
error.jsp:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>文件上传失败</title>
</head>
<body>
<h1>文件上传失败！</h1>
<p>抱歉，文件上传过程中出现了问题。请稍后重试。</p>
</body>
</html>
现在，当用户通过表单选择文件并提交时，FileUploadServlet将处理文件上传并将其保存到服务器的指定目录。根据上传结果，用户将被重定向到成功或错误页面。
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