java读文件

RandomAccessFile randomFile = null;
try {
// 打开一个随机访问文件流，按只读方式
randomFile = new RandomAccessFile(fileName, "r");
// 文件长度，字节数
long fileLength = randomFile.length();
// 读文件的起始位置
//int beginIndex = (fileLength > 4) ? 4 : 0;
//将读文件的开始位置移到beginIndex位置。
//randomFile.seek(beginIndex);
byte[] bytes = new byte[17];
int byteread = 0;
while (randomFile.readInt()!=-1){
int SIP=randomFile.readInt();
int DIP=randomFile.readInt();
short Sport=randomFile.readShort();
short Dport=randomFile.readShort();
short Length=randomFile.readShort();
short time=randomFile.readShort();
byte tag=randomFile.readByte();
System.out.println(SIP+" "+DIP+" "+Sport+" "+Dport+" "+Length+" "+time+" "+tag+"\n");
}
} catch (IOException e){
e.printStackTrace();
} finally {
if (randomFile != null){
try {
randomFile.close();
} catch (IOException e1) {
}
}
}