fileutil.java

jdo开发实例,一个功能全面的oa系统

package com.gzrealmap.oa;

/**
 * <p>Title: RealOA2003a</p>
 * <p>Description: OA二期开发</p>
 * <p>Copyright: Copyright (c) 2002-2003</p>
 * <p>Company: RealMap.cc</p>
 * @author Mulder
 * @version V2003a
 */
import java.io.*;

public class FileUtil {
  public final static String jpeg = "jpeg";
  public final static String jpg = "jpg";
  public final static String gif = "gif";
  public final static String tiff = "tiff";
  public final static String tif = "tif";
  public final static String png = "png";
  public final static String xml = "xml";
  public final static String xsl = "xsl";
  public final static String doc = "doc";
  public final static String txt = "txt";
  public final static String xsd = "xsd";
  public final static String dtd = "dtd";
  public final static String htm = "htm";
  public final static String html = "html";


  public static final int sizeLimit = 5120000;
  public static byte[] stream2Bytes(InputStream ins) throws Exception {
    byte[] result;
    byte[] b = new byte[sizeLimit];
    int size = 0;
    int i;
    while ( (i = ins.read()) != -1) {
      b[size] = (byte) i;
      if (size >= sizeLimit)
        throw new IOException("File size exceeded size limit!");
      size++;
    }

    result = new byte[size];
    System.arraycopy(b, 0, result, 0, size);
    //System.out.println(HexUtils.convert(result));
    //System.out.print(byteToHex(result));
    return result;
  }

  public static String stream2Hex(InputStream ins) throws Exception {
    StringBuffer hex = new StringBuffer();
    int size = 0;
    int i;
    while ( (i = ins.read()) != -1) {
      char c = toHexChar(i);
      System.out.print(c);
      hex.append(c);
      /*
             hex.append((toHexChar(i >>> 4) & 0x0F));
             hex.append(toHexChar(i & 0x0F));
       */
      if (size >= sizeLimit)
        throw new IOException("File size exceeded size limit!");
      size++;
    }
    return hex.toString();
  }

  /**
   * method to convert a byte to a hex string.
   *
   * @param data the byte to convert
   * @return String the converted byte
   */
  public static String byteToHex(byte[] data) {

    StringBuffer buf = new StringBuffer();
    for (int i = 0; i < data.length; i++) {
      buf.append(toHexChar( (data[i] >>> 4) & 0x0F));
      buf.append(toHexChar(data[i] & 0x0F));
      //System.out.println(i);
    }
    return buf.toString();
  }

  /**
   * Convenience method to convert an int to a hex char.
   *
   * @param i the int to convert
   * @return char the converted char
   */
  public static char toHexChar(int i) {
    if ( (0 <= i) && (i <= 9)) {
      return (char) ('0' + i);
    }
    else {
      return (char) ('A' + (i - 10));
    }
  }

  /**
   *  用于删除文件名的后缀
   */
  public static final String getFileBasicName(String filename) {
    if (filename != null) {
      int endIndex = filename.lastIndexOf(".");
      if (endIndex > 0) {
        filename = filename.substring(0, endIndex);
      }
      return filename;
    }
    return null;
  }

  /*
   * Get the extension of a file.
   */
  public static String getExtension(File f) {
    String ext = null;
    String s = f.getName();
    int i = s.lastIndexOf('.');

    if (i > 0 && i < s.length() - 1) {
      ext = s.substring(i + 1).toLowerCase();
    }
    return ext;
  }

  public static final String byteToHex(byte byte0) {
    char ac[] = {
        '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
        'a', 'b', 'c', 'd', 'e', 'f'
    };
    char ac1[] = {
        ac[byte0 >> 4 & 0xf], ac[byte0 & 0xf]
    };
    return new String(ac1);
  }

  public static void main(String[] args) {
    System.out.println(FileUtil.getFileBasicName("cc.abc"));
  }

}