从一个流中查找指定数组

import java.io.InputStream;public class SeekInputStream {/** * 在流中查找,不适合查找全0数组,by samyou * @param in * @param key * @return */public static int seekBytes(InputStream in,byte[] key){int lastSeekEnd = 0;int result = -1;byte buff[] = new byte[1000];if(key.length > buff.length){return -1;}try {in.read(buff);do{result = normalSeek(buff, key);if(result >= 0){break;}System.arraycopy(buff, buff.length-key.length, buff, 0, key.length);lastSeekEnd+=buff.length-key.length;}while( in.read(buff, key.length, buff.length-key.length) >0 );} catch (Exception e) {e.printStackTrace();try {in.close();} catch (Exception e2) {}return -1;}try {in.close();} catch (Exception e2) {}return result+lastSeekEnd;}/** KMP查找算法 在一块buff中找 */private static int normalSeek(byte[] buff,byte[] key){for(int i=0;i<buff.length -key.length;i++){boolean seekSuccess = true;for(int j=0;j<key.length;j++){if(buff[i+j] != key[j]){seekSuccess  =false;break;}}if(seekSuccess){return i;}}return -1;}}