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java¶ÁÈ¡Îļþ»òÊÇÎļþÁ÷µÄ´úÂ룬º­¸ÇÁ˶ÁÈ¡jarÎļþÖеÄÎļþÁ÷£¬ÍøÂçÎļþÁ÷µÈ£¬ÓÐЩ¶ÁÈ¡·½Ê½ÎªÁË·ÀÖ¹±àÂëת»»´øÀ´µÄÎÊÌ⣬²ÉÈ¡Á˶¯Ì¬byte[]µÄ·½Ê½¶ÁÈ¡£¬Ô´ÂëÈçÏ :

import java.io.BufferedInputStream;

import java.io.File;

import java.io.BufferedOutputStream;

import java.io.IOException;

import java.io.FileInputStream;

import java.io.FileOutputStream;

public class Util ...{

public Util() ...{

}

/** *//**

   * ¶ÁÈ¡Ô´ÎļþÄÚÈÝ

   * @param filename String Îļþ·¾¶

   * @throws IOException

   * @return byte[] ÎļþÄÚÈÝ

   */

public static byte[] readFile(String filename) throws IOException ...{

    File file =new File(filename);

    if(filename==null || filename.equals(""))

    ...{

      throw new NullPointerException("ÎÞЧµÄÎļþ·¾¶");

    }

    long len = file.length();

    byte[] bytes = new byte[(int)len];

    BufferedInputStream bufferedInputStream=new BufferedInputStream(new FileInputStream(file));

    int r = bufferedInputStream.read( bytes );

    if (r != len)

      throw new IOException("¶ÁÈ¡Îļþ²»ÕýÈ·");

    bufferedInputStream.close();

    return bytes;

}

/** *//**

   * ½«Êý¾ÝдÈëÎļþ

   * @param data byte[]

   * @throws IOException

   */

public static void writeFile(byte[] data,String filename) throws IOException ...{

    File file =new File(filename);

    file.getParentFile().mkdirs();

    BufferedOutputStream bufferedOutputStream=new BufferedOutputStream(new FileOutputStream(file));

    bufferedOutputStream.write(data);

    bufferedOutputStream.close();

}

/** *//**

   * ´ÓjarÎļþÀï¶ÁÈ¡class

   * @param filename String

   * @throws IOException

   * @return byte[]

   */

public byte[] readFileJar(String filename) throws IOException ...{

    BufferedInputStream bufferedInputStream=new BufferedInputStream(getClass().getResource(filename).openStream());

    int len=bufferedInputStream.available();

    byte[] bytes=new byte[len];

    int r=bufferedInputStream.read(bytes);

    if(len!=r)

    ...{

      bytes=null;

      throw new IOException("¶ÁÈ¡Îļþ²»ÕýÈ·");

    }

    bufferedInputStream.close();

    return bytes;

}

/** *//**

   * ¶ÁÈ¡ÍøÂçÁ÷£¬ÎªÁË·ÀÖ¹ÖÐÎĵÄÎÊÌ⣬ÔÚ¶ÁÈ¡¹ý³ÌÖÐûÓнøÐбàÂëת»»£¬¶øÇÒ²ÉÈ¡Á˶¯Ì¬µÄbyte[]µÄ·½Ê½»ñµÃËùÓеÄbyte·µ»Ø

   * @param bufferedInputStream BufferedInputStream

   * @throws IOException

   * @return byte[]

   */

public byte[] readUrlStream(BufferedInputStream bufferedInputStream) throws IOException ...{

    byte[] bytes = new byte[100];

    byte[] bytecount=null;

    int n=0;

    int ilength=0;

    while((n=bufferedInputStream.read(bytes))>=0)

    ...{

      if(bytecount!=null)

        ilength=bytecount.length;

      byte[] tempbyte=new byte[ilength+n];

      if(bytecount!=null)

      ...{

        System.arraycopy(bytecount,0,tempbyte,0,ilength);

      }

      System.arraycopy(bytes,0,tempbyte,ilength,n);

      bytecount=tempbyte;

      if(n<bytes.length)

        break;

    }

    return bytecount;

}

}