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/
代码:
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吗
答案 0 :(得分:6)
我试图解决你的问题,我最终遇到了同样的情况,创建的文件仍然是空的。
但是,我认为我找到了问题的原因。
以下是ganymed API的ch.ethz.ssh2.SFTPv3Client.write()方法的摘录
/**
* Write bytes to a file. If <code>len</code> > 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,当你发送数据写时,len是&gt; 0,并且由于伪造条件,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)。
我猜之前就有一条声明在“if(len&lt; 0)”之后,但是有人拿走了它并给我们留下了无用的代码......
更新:
获取最新版本(上面的示例使用的是build 210)。 我对构建250和251没有任何问题。
这是我的代码,它正确写入我的ssh服务器上的新文件。
你需要防弹这个:)
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();
}
答案 1 :(得分:0)
上面托尼的回答,包括完整的课程和进口。您需要添加 ganymed 和 jsch 罐子:
import java.io.File;
import java.io.FileInputStream;
import java.io.FileWriter;
import java.io.IOException;
import ch.ethz.ssh2.Connection;
import ch.ethz.ssh2.SFTPv3Client;
import ch.ethz.ssh2.SFTPv3FileHandle;
public class GanyMedFTP {
public static void main(String[] args) {
Connection conn = new Connection("serverip");
try {
conn.connect();
boolean isAuthenticated = conn.authenticateWithPassword("myusername", "mypassword");
if (isAuthenticated == false)
throw new IOException("Authentication failed.");
SFTPv3Client client = new SFTPv3Client(conn);
String fileName="OddyRoxxx.txt";
File tmpFile = File.createTempFile(fileName, "dat");
SFTPv3FileHandle handle = client.createFile(fileName);
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();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}