jsp上传图片并修改图片大小

<form action="uploadImage.jsp" method="post" enctype="multipart/form-data">
    <input type="file" name="image" accept="image/*" required>
    <input type="submit" value="Upload">
</form>

<%@ page import="java.io.*, java.util.*, javax.servlet.http.*, javax.servlet.*, javax.imageio.ImageIO, java.awt.image.BufferedImage" %>
<%@ page import="org.apache.commons.fileupload.*, org.apache.commons.fileupload.disk.*, org.apache.commons.fileupload.servlet.*" %>
<%@ page import="org.apache.commons.io.output.*" %>

<%
    // Check if the request contains multipart content
    boolean isMultipart = ServletFileUpload.isMultipartContent(request);
    if (!isMultipart) {
        out.println("No file uploaded");
        return;
    }

    // Create a factory for disk-based file items
    DiskFileItemFactory factory = new DiskFileItemFactory();

    // Create a new file upload handler
    ServletFileUpload upload = new ServletFileUpload(factory);

    try {
        // Parse the request to get file items
        List<FileItem> fileItems = upload.parseRequest(request);

        // Process the uploaded file items
        Iterator<FileItem> i = fileItems.iterator();
        while (i.hasNext()) {
            FileItem fi = i.next();
            if (!fi.isFormField()) {
                String fieldName = fi.getFieldName();
                String fileName = fi.getName();
                String contentType = fi.getContentType();
                boolean isInMemory = fi.isInMemory();
                long sizeInBytes = fi.getSize();

                // Define the new dimensions
                int targetWidth = 200;
                int targetHeight = 200;

                // Read the image
                BufferedImage originalImage = ImageIO.read(fi.getInputStream());
                BufferedImage resizedImage = new BufferedImage(targetWidth, targetHeight, BufferedImage.TYPE_INT_RGB);
                Graphics2D g2d = resizedImage.createGraphics();
                g2d.drawImage(originalImage, 0, 0, targetWidth, targetHeight, null);
                g2d.dispose();

                // Save the resized image
                String uploadPath = getServletContext().getRealPath("") + File.separator + "uploads";
                File uploadDir = new File(uploadPath);
                if (!uploadDir.exists()) uploadDir.mkdir();

                String filePath = uploadPath + File.separator + fileName;
                File outputFile = new File(filePath);
                ImageIO.write(resizedImage, "jpg", outputFile);

                out.println("File " + fileName + " has uploaded successfully!");
            }
        }
    } catch (Exception ex) {
        out.println("There was an error: " + ex.getMessage());
    }
%>