javaweb 上传文件 级别 holleword

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.List;

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;

/**
 * Servlet implementation class UploadServlet
 */
public class UploadServlet extends HttpServlet {

	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
	 *      response)
	 */
	protected void doPost(HttpServletRequest request,
			HttpServletResponse response) throws ServletException, IOException {
		// TODO Auto-generated method stub

		DiskFileItemFactory factory = new DiskFileItemFactory();

		factory.setSizeThreshold(1024 * 1024 * 5);
		factory.setRepository(new File("y:\\file"));

		ServletFileUpload upload = new ServletFileUpload(factory);

		upload.setSizeMax(1024 * 1024 * 25);

		try {
			List<FileItem> items = upload.parseRequest(request);
			for (FileItem item : items) {
				if (item.isFormField()) {
					String name = item.getFieldName();
					String value = item.getString();
					System.out.println(name + "\n" + value);
				} else {
					String fieldName = item.getFieldName();
					String fileName = item.getName();
					String contentType = item.getContentType();
					boolean isInMemory = item.isInMemory();
					long sizeInBytes = item.getSize();
					System.out.println(fieldName + "\n" + fileName + "\n"
							+ contentType + "\n" + isInMemory + "\n"
							+ sizeInBytes);
					String saveFileUrl = "y:\\file\\"
							+ new File(item.getName()).getName();
					InputStream in = item.getInputStream();
					OutputStream out = new FileOutputStream(saveFileUrl);
					byte[] buffer = new byte[1024];
					int len = 0;
					while ((len = in.read(buffer)) != -1) {
						out.write(buffer, 0, len);
					}
					out.close();
					in.close();
				}
			}

		} catch (FileUploadException e) {
			e.printStackTrace();
		}

	}

}