import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.wk.util.StringUtil;

@SuppressWarnings("serial")
public class FileUploadServlet extends HttpServlet {
    public static final byte CR = 0x0D;
    public static final byte LF = 0x0A;
    public static final byte DASH = 0x2D;
    protected static final int REMAIN_SIZE = 64;
    protected static final int DEFAULT_BUFSIZE = 4096;
    protected static final int READ_BUFSIZE = DEFAULT_BUFSIZE - REMAIN_SIZE;
    protected static final byte[] HEADER_SEPARATOR = {CR, LF, CR, LF};
    protected static final byte[] FIELD_SEPARATOR = {CR, LF};
    protected static final byte[] STREAM_TERMINATOR = {DASH, DASH};
    protected static final byte[] BOUNDARY_PREFIX = {CR, LF, DASH, DASH};

    private static String upload_base_path;

    protected boolean equals(byte[] b1, int start1, byte[] b2, int start2, int length) {
        if (b1.length - start1 < length) {
            return false;
        }

        if (b2.length - start2 < length) {
            return false;
        }

        for (int i = 0; i < length; i++) {
            if (b1[start1 + i] != b2[start2 + i]) {
                return false;
            }
        }

        return true;
    }

    protected int search(byte[] b, int start, String str) {
        return search(b, start, str.getBytes());
    }

    protected int search(byte[] b, int start, byte[] s) {
        int length = s.length;
        byte first = s[0];
        for (int i = start, total = b.length - length; i <= total; i++) {
            if (b[i] == first && equals(b, i, s, 0, length)) {
                return i;
            }
        }

        return -1;
    }

    protected byte[] merge(byte[]... bs) {
        if (bs == null) {
            return null;
        }

        int total = 0;
        for (byte[] b : bs) {
            total += b.length;
        }

        byte[] newb = new byte[total];
        int offset = 0;
        for (byte[] b : bs) {
            System.arraycopy(b, 0, newb, offset, b.length);
            offset += b.length;
        }

        return newb;
    }

    protected int readFully(InputStream in, byte[] buff, int offset, int length) {
        int total = 0;
        while (true) {
            try {
                int readlen = in.read(buff, offset, length);
                if (readlen == -1) {
                    return 0;
                }

                total += readlen;
                if (readlen == length) {
                    return total;
                }

                offset += readlen;
                length -= readlen;
            } catch (IOException ioe) {
                return -1;
            }
        }
    }

    protected void afterUploadSuccess(int index, String name, String fileName) {
    }

    protected void afterUploadFail(String errcode, String errmsg) {
        afterUploadFail(0, errcode, errmsg);
    }

    protected void afterUploadFail(int index, String errcode, String errmsg) {
        if (index == 0) {
            System.out.println(errcode + ":" + errmsg);
        } else {