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鸽子
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878天前//按自定义缓冲区大小读取 |
public static void main(String[] args) throws Exception { |
int bufSize = 1024; |
byte[] bs = new byte[bufSize]; |
ByteBuffer byteBuf = ByteBuffer.allocate(1024); |
FileChannel channel = new RandomAccessFile(fff, "r").getChannel(); |
while (channel.read(byteBuf) != -1) { |
int size = byteBuf.position(); |
byteBuf.rewind(); |
byteBuf.get(bs); // 把文件当字符串处理，直接打印做为一个例子。 |
System.out.print(new String(bs, 0, size)); |
byteBuf.clear(); |
} |
} |
//按行读取 |
public static void main2(String[] args) throws Exception { |
BufferedReader br = new BufferedReader(new FileReader(fff)); |
String line = null; |
while ((line = br.readLine()) != null) { |
System.out.println(line); |
} |
} |
//读取指定行数 |
public static void main3(String[] args) throws IOException { |
String path = "你要读的文件的路径"; |
RandomAccessFile br = new RandomAccessFile(path, "rw"); //这里rw看你了。要是之都就只写r |
String str = null, app = null; |
int i = 0; |
while ((str = br.readLine()) != null) { |
i++; |
app = app + str; |
if(i >= 100) { //假设读取100行 |
i = 0; |
// 这里你先对这100行操作，然后继续读 |
app = null; |
} |
} |
br.close(); |
} |
