Servlet3.0中使用getPart进行文件上传

package cc.openhome;

import java.io.InputStream;
import java.io.OutputStream;
import java.io.FileOutputStream;
import java.io.FileNotFoundException;
import java.io.File;
import java.io.IOException;
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;

/**
 * Servlet implementation class UploadServlet
 */

@WebServlet("/upload.do")
@MultipartConfig
public class UploadServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public UploadServlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        //request.setCharacterEncoding("UTF-8");
        Part part = request.getPart("photo");
        //String uploadPath = request.getServletContext().getRealPath("/upload");  
        String fileName = getFileName(part);
        System.out.println(fileName + "*****************");
        writeTo(fileName, part);
    }
    
    private String getFileName(Part part) {
        String header = part.getHeader("Content-Disposition");
        String fileName = header.substring(header.indexOf("filename=\"") + 10,
                header.lastIndexOf("\""));
        return fileName;
    }
    
    private void writeTo(String fileName, Part part) throws FileNotFoundException, IOException {
        String uploadPath = "c:/workspace";  
        part.write(uploadPath + File.separator + fileName);
        /***
        InputStream in = part.getInputStream();
        OutputStream out = new FileOutputStream("c:/workspace" + fileName);
        byte[] buffer = new byte[1024];
        int length = -1;
        while ((length = in.read(buffer)) != -1) {
            out.write(buffer, 0, length);
        }
        in.close();
        out.close();
        ***/
    }
}