運行JTape庫（Java庫路徑）

Question

我試圖使用JTape Library從DDS4磁帶讀取一些數據。 我想使用Eclipse的Linux 12.04 LTS

的問題是，我不能讓蝕參考TapeLinux.c庫以任何方式下運行我的代碼。

問題：

​​

這是我的課：

/* TestEOD.java */ 

import java.io.*; 

public class TestEOD { 
public static void main(String[] args) throws IOException { 
    /* if (args.length != 1) { 
     System.err.println("Usage: java TestEOD <path to device>"); 
     System.exit(1); 
    }*/ 

    BasicTapeDevice d = new BasicTapeDevice("/dev/nst0"); 

    System.out.print("Rewinding..."); 
    System.out.flush(); 
    d.rewind(); 
    System.out.println("done!"); 

    System.out.print("Spacing to end of data..."); 
    System.out.flush(); 
    d.spaceEOD(); 
    System.out.println("done!"); 
} 
} 


/* BasicTapeDevice.java */ 

import java.io.*; 
public class BasicTapeDevice { 
private FileDescriptor fd; 
private InputStream in; 
private OutputStream out; 
private boolean eof; 
private boolean eom; 
private boolean ignoreEOM; 

public BasicTapeDevice(String pathName) throws IOException { 
    fd = new FileDescriptor(); 
    tapeOpen(pathName); 
    in = new TapeInputStream(); 
    out = new TapeOutputStream(); 
    eof = false; 
    eom = false; 
    ignoreEOM = false; 
} 
public synchronized void close() throws IOException { 
    if (fd != null) { 
     try { 
      if (fd.valid()) { 
       tapeClose(); 
      } 
     } finally { 
      fd = null; 
     } 
    } 
} 
public InputStream getInputStream() throws IOException { 
    ensureOpen(); 
    return in; 
} 
public OutputStream getOutputStream() throws IOException { 
    ensureOpen(); 
    return out; 
} 
public int getBlockSize() throws IOException { 
    ensureOpen(); 
    return tapeGetBlockSize(); 
} 
public void setBlockSize(int bs) throws IOException { 
    ensureOpen(); 
    tapeSetBlockSize(bs); 
} 
public void rewind() throws IOException { 
    ensureOpen(); 
    tapeRewind(); 
} 
public void spaceEOD() throws IOException { 
    ensureOpen(); 
    tapeSpaceEOD(); 
} 
public void clearEOF() throws IOException { 
    ensureOpen(); 
    if (eof) { 
     eof = false; 
     /* assume that the file mark has already been skipped */ 
    } else { 
     throw new IOException("not at end of file"); 
    } 
} 
public void clearEOM() throws IOException { 
    ensureOpen(); 

    if (eom) { 
     ignoreEOM = true; 
    } else { 
     throw new IOException("not at logical end of media"); 
    } 
} 
class TapeInputStream extends InputStream { 
    private byte[] temp = new byte[1]; 
    public int read() throws IOException { 
     int n = read(temp, 0, 1); 
     if (n <= 0) { 
      return -1; 
     } 
     return temp[0] & 0xff; 
    } 
    public int read(byte[] b, int off, int len) throws IOException { 
     if (b == null) { 
      throw new NullPointerException(); 
     } 
     if (off < 0 || len < 0 || off+len > b.length) { 
      throw new IndexOutOfBoundsException(); 
     } 
     if (len == 0) { 
      return 0; 
     } 
     if (eof) { 
      return -1; 
     } 
     ensureOpen(); 
     int n = tapeRead(b, off, len); 
     if (n <= 0) { 
      return -1; 
     } 
     return n; 
    } 
    public long skip(long numbytes) throws IOException { 
     return 0; 
    } 
    public void close() throws IOException { 
     BasicTapeDevice.this.close(); 
    } 
} 
class TapeOutputStream extends OutputStream { 
    private byte[] temp = new byte[1]; 

    public void write(int b) throws IOException { 
     temp[0] = (byte) b; 
     write(temp, 0, 1); 
    } 
    public void write(byte[] b) throws IOException { 
     write(b, 0, b.length); 
    } 
    public void write(byte[] b, int off, int len) throws IOException { 
     if (b == null) { 
      throw new NullPointerException(); 

     } 
     if (off < 0 || len < 0 || off+len > b.length) { 
      throw new IndexOutOfBoundsException(); 
     } 
     if (eom && !ignoreEOM) { 
      throw new LogicalEOMException("logical end-of-media"); 
     } 
     int n = tapeWrite(b, off, len); 
     while (n < len) { 
      n += tapeWrite(b, off + n, len - n); 
     } 
    } 
    public void close() throws IOException { 
     BasicTapeDevice.this.close(); 
    } 
} 
protected void finalize() { 
    try { 
     close(); 
    } catch (IOException ex) { 
    } 
} 
private void ensureOpen() throws IOException { 
    if (fd == null || !fd.valid()) { 
     throw new IOException("tape device is not open"); 
    } 
} 
private static native void initFields(); 
private native void tapeOpen(String pathName) throws IOException; 
private native void tapeClose() throws IOException; 
private native int tapeRead(byte[] b, int off, int len) throws IOException; 
private native int tapeWrite(byte[] b, int off, int len) throws IOException; 
private native int tapeGetBlockSize() throws IOException; 
private native void tapeSetBlockSize(int bs) throws IOException; 
private native void tapeRewind() throws IOException; 
private native void tapeSpaceEOD() throws IOException; 

/* load the JNI library specific for this platform */ 
static { 
    StringBuffer buf = new StringBuffer("Tape"); 
    String osName = System.getProperty("os.name"); 
    if (osName.equals("Windows NT") || osName.equals("Windows 2000")) { 
     buf.append("WinNT"); 
    } else { 
     buf.append(osName); 
    } 
    System.loadLibrary(buf.toString()); 
    initFields(); 
} 
} 

我曾嘗試

我身邊，看起來我需要的是包括路徑包含文件TapeLinux.c的文件夾的文件夾

我已經嘗試了所有these answers並沒有什麼變化

能否請你幫我找出我怎麼能在這種情況下使用JNI和我應該配置到我的代碼運行

感謝

Answer 1

由於你是在Linux上，該消息......主要java.lang.UnsatisfiedLinkError中：在java中TapeLinux ...可能意味着命名libTapeLinux.so庫中找不到。

看來你是試圖找到TapeLinux.c尋找解決的辦法，你應該尋找libTapeLinux.so，一旦你發現它確保libTapeLinux.so是負載路徑上。