servlet+文件上传

import java.io.File; import java.io.IOException; import java.util.List; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; import org.apache.commons.fileupload.FileItemFactory; public class Upload extends HttpServlet { public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { ServletFileUpload upload = new ServletFileUpload( new DiskFileItemFactory()); upload.setSizeMax(10 * 1024 * 1024); try { write(upload.parseRequest(request)); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } private void write(List<FileItem> list) throws Exception{ if (list.size() >=1) { FileItem item = list.get(0); String name = item.getName(); name = name.substring(name.lastIndexOf("\\") + 1); String path = getServletContext().getRealPath(""); item.write(new File(path, name)); } } } <form method="post" action="upload" enctype="multipart/form-data"> <input type="file" name="uploadfile"/> <input type="submit" value="上传文件"> </form>