Ganymed API:SFTP使用

Question

我正在使用Ganymed API来进入Unix服务器.我能够在服务器中创建文件,但文件的内容始终为空.

Ganymed API位置:http://www.ganymed.ethz.ch/ssh2/

码:

  function (ByteArrayOutputStream reportBytes){
 // reportBytes is a valid ByteArrayOutputStream
 // if I write it to a file in to a local directory using reportBytes.writeTo(fout); 
 // I can see the contents */

 byte byteArray[]=reportBytes.toByteArray();

 SFTPv3FileHandle SFTPFILEHandle=sftpClient.createFileTruncate("test.txt");
 //The file is created successfully and it is listed in unix 
 // The permissions of the file -rw-r--r-- 1 test.txt


 sftpClient.write(SFTPFILEHandle, 0, byteArray, 0,byteArray.length );
 //The above line doesnt seem to work, the file is always empty
 }

 /* write function definition is */
 public void write(SFTPv3FileHandle handle, long fileOffset, byte[] src, int srcoff, int len) throws IOException

有人可以告诉我,如果我在这里做错了什么

Answer 1

我试图解决你的问题,我最终处于相同的情况,创建的文件仍然是空的.

但是,我想我找到了问题的原因.

这是ganymed API的ch.ethz.ssh2.SFTPv3Client.write()方法的摘录

    /**
 * Write bytes to a file. If <code>len</code> &gt; 32768, then the write operation will
 * be split into multiple writes.
 * 
 * @param handle a SFTPv3FileHandle handle.
 * @param fileOffset offset (in bytes) in the file.
 * @param src the source byte array.
 * @param srcoff offset in the source byte array.
 * @param len how many bytes to write.
 * @throws IOException
 */
public void write(SFTPv3FileHandle handle, long fileOffset, byte[] src, int srcoff, int len) throws IOException
{
    checkHandleValidAndOpen(handle);

    if (len < 0)

        while (len > 0)
        {

你看,当你发送数据写入时,len是> 0,并且由于伪造的条件,该方法立即返回,并且它永远不会进入while循环(实际上是向文件写入内容).

我猜之前有一个声明"if(len <0)"之后,但有人拿走了它并给我们留下了无用的代码......

更新:

去获取最新版本(上面的例子是使用build 210).我对构建250和251没有任何问题.

这是我的代码,它正确地写入我的ssh服务器上的新文件.

你需要防弹:)

    public static void main(String[] args) throws Exception {
        Connection conn = new Connection(hostname);
        conn.connect();
        boolean isAuthenticated = conn.authenticateWithPassword(username, password);

        if (isAuthenticated == false)
            throw new IOException("Authentication failed.");
        SFTPv3Client client = new SFTPv3Client(conn);
        File tmpFile = File.createTempFile("teststackoverflow", "dat");
        FileWriter fw = new FileWriter(tmpFile);
        fw.write("this is a test");
        fw.flush();
        fw.close();

        SFTPv3FileHandle handle = client.createFile(tmpFile.getName());
        FileInputStream fis = new FileInputStream(tmpFile); 
        byte[] buffer = new byte[1024];
        int i=0;
                    long offset=0;
        while ((i = fis.read(buffer)) != -1) {
            client.write(handle,offset,buffer,0,i);
                            offset+= i;

        }
        client.closeFile(handle);
        if (handle.isClosed())  System.out.println("closed");;
        client.close();
}