本文介绍了BufferOverflowException的原因是什么?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
异常堆栈是
java.nio.BufferOverflowException at java.nio.DirectByteBuffer.put(DirectByteBuffer.java:327) at java.nio.ByteBuffer.put(ByteBuffer.java:813) mappedByteBuffer.put(bytes);代码:
randomAccessFile = new RandomAccessFile(file, "rw"); fileChannel = randomAccessFile.getChannel(); mappedByteBuffer = fileChannel.map(MapMode.READ_WRITE, 0, file.length());并调用 mappedByteBuffer.put(bytes);
原因是什么 mappedByteBuffer.put(bytes) throws BufferOverflowException 如何查找原因?
What is the cause mappedByteBuffer.put(bytes) throws BufferOverflowException How to find the cause ?
推荐答案FileChannel #map :
此方法返回的映射字节缓冲区的位置为零,限制和容量大小;
The mapped byte buffer returned by this method will have a position of zero and a limit and capacity of size;
换句话说,如果 bytes.length> file.length <),你应该收到 BufferOverflowException 。
In other words, if bytes.length > file.length(), you should receive a BufferOverflowException.
要证明点,我测试了这段代码:
To prove the point, I have tested this code:
File f = new File("test.txt"); try (RandomAccessFile raf = new RandomAccessFile(f, "rw")) { FileChannel ch = raf.getChannel(); MappedByteBuffer buf = ch.map(MapMode.READ_WRITE, 0, f.length()); final byte[] src = new byte[10]; System.out.println(src.length > f.length()); buf.put(src); }当且仅当 true ,抛出此异常:
Exception in thread "main" java.nio.BufferOverflowException at java.nio.DirectByteBuffer.put(DirectByteBuffer.java:357) at java.nio.ByteBuffer.put(ByteBuffer.java:832)更多推荐
BufferOverflowException的原因是什么?
发布评论