我可以在Java中正确关闭输入流吗？

本文介绍了我可以在Java中正确关闭输入流吗？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 29岁程序员，3月因学历无情被辞！ 我创建了一个扩展InputStream的类，以便我可以对正在读取的字节数进行计数，并在超出我定义的最大限制时引发异常。I created a class that extends InputStream so that I can keep count of the number of bytes being read and throw an exception if it exceeds a max limit that I define.这是我的课程： public class LimitedSizeInputStream extends InputStream { private final InputStream original; private final long maxSize; private long total; public LimitedSizeInputStream(InputStream original, long maxSize) { this.original = original; this.maxSize = maxSize; } @Override public int read() throws IOException { int i = original.read(); if (i >= 0) { incrementCounter(1); } return i; } @Override public int read(byte b[]) throws IOException { return read(b, 0, b.length); } @Override public int read(byte b[], int off, int len) throws IOException { int i = original.read(b, off, len); if (i >= 0) { incrementCounter(i); } return i; } private void incrementCounter(int size) throws IOException { total += size; if (total > maxSize) { throw new IOException("InputStream exceeded maximum size in bytes."); } } }这是来自：复制InputStream，如果大小超出限制，则中止操作 ，我正在实现一个Jersey API，如果用户上传的文件过大，该API将会失败。This is coming from: Copy InputStream, abort operation if size exceeds limit, I am implementing a Jersey API that needs to fail if a user is uploading a file that is too large.这是我的资源类： @POST @Consumes(MediaType.MULTIPART_FORM_DATA) @Path("/test") public Response load( @Context HttpServletRequest request, @FormDataParam(FILE_FIELD) FormDataBodyPart file) { if (request.getContentLength() > MAX_FILE_SIZE_IN_BYTES) { // fail fast handle failure } try (InputStream stream = new LimitedSizeInputStream( file.getValueAs(InputStream.class), MAX_FILE_SIZE_IN_BYTES)) { // some logic } catch (IOException e) { // handle failure }}我将LimitedSizeInputStream包装在try资源中，因此我认为流应该正确关闭。对于是否正确处理关闭操作，或者我是否通过LimitedSizeInputStream和file.getValueAs（InputStream.class）技术上打开两个输入流，而只有一个正在关闭，我只是感到困惑？I wrapped LimitedSizeInputStream in my try resource so I think the stream should close properly. I'm just a bit confused as to whether the close is handled correctly or if I'm technically opening two input streams through LimitedSizeInputStream and file.getValueAs(InputStream.class) and only one is closing?推荐答案 try-with-resources仅关闭声明的资源。因此只会关闭 metadataStream 。The try-with-resources only closes the declared resource. So will only close metadataStream.您应在 LimitedSizeInputStream 中实现 close 方法关闭原始流。You should implement the close method in LimitedSizeInputStream to close the original stream.@Overridepublic void close() throws IOException { original.close();} 这篇关于我可以在Java中正确关闭输入流吗？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！ 上岸，阿里云！