jsp网页图片上传

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

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

<%
    boolean isMultipart = ServletFileUpload.isMultipartContent(request);
    if (!isMultipart) {
        out.println("No file uploaded");
        return;
    }

    DiskFileItemFactory factory = new DiskFileItemFactory();
    ServletFileUpload upload = new ServletFileUpload(factory);

    List<FileItem> items = upload.parseRequest(request);
    Iterator<FileItem> iter = items.iterator();

    while (iter.hasNext()) {
        FileItem item = iter.next();
        if (!item.isFormField()) {
            String fileName = item.getName();
            String filePath = application.getRealPath("/uploads") + "/" + fileName;
            File uploadedFile = new File(filePath);
            item.write(uploadedFile);
            out.println("File uploaded successfully to " + filePath);
        }
    }
%>

<servlet>
    <servlet-name>UploadServlet</servlet-name>
    <servlet-class>com.example.UploadServlet</servlet-class>
    <multipart-config>
        <max-file-size>20848820</max-file-size> <!-- 最大文件大小（字节） -->
        <max-request-size>418018841</max-request-size> <!-- 最大请求大小（字节） -->
        <file-size-threshold>1048576</file-size-threshold> <!-- 文件大小阈值（字节） -->
    </multipart-config>
</servlet>

if (!item.getContentType().startsWith("image")) {
    out.println("Invalid file type");
    return;
}

String uniqueFileName = UUID.randomUUID().toString() + "_" + fileName;