JSchException找不到消息

Question

我想知道一些可能导致以下例外情况的原因。我无法在Cannot find message中找到这条消息jsch-0.1.54.jar。有一些直接的消息，如file not found和其他有意义的。但我需要更多关于这个问题的信息，这样我才能找到根本原因。

SftpException while running get ---> 2: Cannot find message [/destination/file.txt]
at com.jcraft.jsch.ChannelSftp.throwStatusError(ChannelSftp.java:2289)
at com.jcraft.jsch.ChannelSftp._stat(ChannelSftp.java:1741)
at com.jcraft.jsch.ChannelSftp._stat(ChannelSftp.java:1758)
at com.jcraft.jsch.ChannelSftp.get(ChannelSftp.java:786)
at com.jcraft.jsch.ChannelSftp.get(ChannelSftp.java:750)
at com.iyi.ftp.SFTP.get(SFTP.java:99)

这是我的呼叫方法。

public boolean get(final String remoteFile, final String localFile) throws JSchException {
    Vector connection = null;
    Session session = null;
    ChannelSftp c = null;
    boolean status = false;
    try {
        connection = this.connect();
        session = connection.get(0);
        c = connection.get(1);
        c.get(remoteFile, localFile);
        status = true;
    }
    catch (JSchException e) {
        SFTP.LGR.warn((Object)("JSchException in SFTP::get() ---> " + FTPFactory.getStackTrace((Throwable)e)));
        throw e;
    }
    catch (SftpException e2) {
        SFTP.LGR.warn((Object)("SftpException while running get ---> " + FTPFactory.getStackTrace((Throwable)e2)));
        throw new JSchException(e2.getMessage());
    }
    catch (CredentialDecryptionException e3) {
        SFTP.LGR.error((Object)"##CredentialDecryptionException##", (Throwable)e3);
        throw new JSchException(e3.getMessage(), (Throwable)e3);
    }
    finally {
        if (c != null) {
            c.quit();
        }
        if (session != null) {
            session.disconnect();
        }
    }
    if (c != null) {
        c.quit();
    }
    if (session != null) {
        session.disconnect();
    }
    return status;
}

这些方法是从jsch-0.1.54.jar获取的，这是一个开源实用程序。

public void get(String src, String dst, final SftpProgressMonitor monitor, final int mode) throws SftpException {
    boolean _dstExist = false;
    String _dst = null;
    try {
        ((MyPipedInputStream)this.io_in).updateReadSide();
        src = this.remoteAbsolutePath(src);
        dst = this.localAbsolutePath(dst);
        final Vector v = this.glob_remote(src);
        final int vsize = v.size();
        if (vsize == 0) {
            throw new SftpException(2, "No such file");
        }
        final File dstFile = new File(dst);
        final boolean isDstDir = dstFile.isDirectory();
        StringBuffer dstsb = null;
        if (isDstDir) {
            if (!dst.endsWith(ChannelSftp.file_separator)) {
                dst += ChannelSftp.file_separator;
            }
            dstsb = new StringBuffer(dst);
        }
        else if (vsize > 1) {
            throw new SftpException(4, "Copying multiple files, but destination is missing or a file.");
        }
        for (int j = 0; j < vsize; ++j) {
            final String _src = v.elementAt(j);
            final SftpATTRS attr = this._stat(_src);
            if (attr.isDir()) {
                throw new SftpException(4, "not supported to get directory " + _src);
            }
            _dst = null;
            if (isDstDir) {
                final int i = _src.lastIndexOf(47);
                if (i == -1) {
                    dstsb.append(_src);
                }
                else {
                    dstsb.append(_src.substring(i + 1));
                }
                _dst = dstsb.toString();
                if (_dst.indexOf("..") != -1) {
                    final String dstc = new File(dst).getCanonicalPath();
                    final String _dstc = new File(_dst).getCanonicalPath();
                    if (_dstc.length() <= dstc.length() || !_dstc.substring(0, dstc.length() + 1).equals(dstc + ChannelSftp.file_separator)) {
                        throw new SftpException(4, "writing to an unexpected file " + _src);
                    }
                }
                dstsb.delete(dst.length(), _dst.length());
            }
            else {
                _dst = dst;
            }
            final File _dstFile = new File(_dst);
            if (mode == 1) {
                final long size_of_src = attr.getSize();
                final long size_of_dst = _dstFile.length();
                if (size_of_dst > size_of_src) {
                    throw new SftpException(4, "failed to resume for " + _dst);
                }
                if (size_of_dst == size_of_src) {
                    return;
                }
            }
            if (monitor != null) {
                monitor.init(1, _src, _dst, attr.getSize());
                if (mode == 1) {
                    monitor.count(_dstFile.length());
                }
            }
            FileOutputStream fos = null;
            _dstExist = _dstFile.exists();
            try {
                if (mode == 0) {
                    fos = new FileOutputStream(_dst);
                }
                else {
                    fos = new FileOutputStream(_dst, true);
                }
                this._get(_src, fos, monitor, mode, new File(_dst).length());
            }
            finally {
                if (fos != null) {
                    fos.close();
                }
            }
        }
    }
    catch (Exception e) {
        if (!_dstExist && _dst != null) {
            final File _dstFile2 = new File(_dst);
            if (_dstFile2.exists() && _dstFile2.length() == 0L) {
                _dstFile2.delete();
            }
        }
        if (e instanceof SftpException) {
            throw (SftpException)e;
        }
        if (e instanceof Throwable) {
            throw new SftpException(4, "", e);
        }
        throw new SftpException(4, "");
    }
}

private SftpATTRS _stat(final byte[] path) throws SftpException {
    try {
        this.sendSTAT(path);
        Header header = new Header();
        header = this.header(this.buf, header);
        final int length = header.length;
        final int type = header.type;
        this.fill(this.buf, length);
        if (type != 105) {
            if (type == 101) {
                final int i = this.buf.getInt();
                this.throwStatusError(this.buf, i);
            }
            throw new SftpException(4, "");
        }
        final SftpATTRS attr = SftpATTRS.getATTR(this.buf);
        return attr;
    }
    catch (Exception e) {
        if (e instanceof SftpException) {
            throw (SftpException)e;
        }
        if (e instanceof Throwable) {
            throw new SftpException(4, "", e);
        }
        throw new SftpException(4, "");
    }
}

Answer 1

错误消息来自您的服务器。这确实是非常奇怪的消息，但我假设是一些自定义的SFTP服务器处理一些“消息”而不是普通文件。

因此，该消息基本上转化为传统SFTP服务器的“无法找到文件”错误。甚至错误代码2 (SSH_FX_NO_SUCH_FILE)也支持这一点。

您在remoteFile中的路径可能是错误的。