자바에서 파일을 읽는 방법

static long testBuffered(String fileName) throws IOException{
    Long startTime = System.currentTimeMillis();
    BufferedReader reader = new BufferedReader(new FileReader(fileName));
    char[] buffer=new char[8*1024];
    long sum = 0;
    while((count=reader.read(buffer))!=-1)
    {
        sum += count;
    }
    reader.close();
    Long endTime = System.currentTimeMillis();
    System.out.println("Total time of BufferedReader is "+ (endTime - startTime) + " milliseconds, Total byte is " + sum);
    return endTime - startTime;
}

static long testRandomAccess(String fileName) throws IOException{
    Long startTime = System.currentTimeMillis();
    RandomAccessFile reader = new RandomAccessFile(fileName,"r");
    int count;
    byte[] buffer=new byte[8*1024];//缓冲区
    long sum = 0;
    while((count=reader.read(buffer))!=-1){
        sum += count;
    }
    reader.close();
    Long endTime = System.currentTimeMillis();
    System.out.println("Total time of RandomAccess is "+ (endTime - startTime) + " milliseconds, Total byte is " + sum);
    return endTime - startTime;
}

public int read(byte b[], int off, int len) throws IOException {
    int c = read();
    if (c == -1) {
        return -1;
    }
    b[off] = (byte)c;
 
    int i = 1;
    try {
        for (; i < len ; i++) {
            c = read();
            if (c == -1) {
                break;
            }
            b[off + i] = (byte)c;
        }
    } catch (IOException ee) {
    }
    return i;
}