结合使用Jackcess和JCIFS来操纵SMB共享上的Access数据库 [英] Using Jackcess with JCIFS to manipulate an Access database on an SMB share
问题描述
我需要使用Jackcess在Java中使用MS Access文件.该文件位于SMB共享上，因此我认为我必须使用JCIFS.
I need to work with an MS Access file in Java using Jackcess. The file is located on an SMB share so I assume I would have to use JCIFS.
我尝试过
String testdirectory = "smb://" + "file location";
SmbFile testsmbdir = null;
try{
testsmbdir = new SmbFile(testdirectory,auth);
}catch(Exception e){
e.printStackTrace();
}
SmbFileInputStream smbFilestream = new SmbFileInputStream(testsmbdir);
db = DatabaseBuilder.open(testsmbdir);
但是，它表示SMBFile不能转换为
However, it says SMBFile can not be converted to File for the
db = DatabaseBuilder.open(testsmbdir)"
行.另外，如果我尝试使用"smbFilestream"来代替，它说它也不能将SmbFileInputStream转换为File.
line. Also if I try using "smbFilestream" instead it says it cannot convert SmbFileInputStream to File either.
我是否必须将文件复制到本地计算机或完全不同的文件?如果可以怎么办?
Do I have to copy the file to the local machine or something completely different? If how can I do so?
(顺便说一句，我是Windows用户.我只是将我的应用程序转换为Mac，如果我的行话关闭了，抱歉.)
(I'm a windows user by the way. I am just converting my application to Mac so sorry if my lingo is off.)
推荐答案
In reply to a thread on the Jackcess forums here, James suggested that
实现与SmbRandomAccessFile一起使用的FileChannel版本应该相对简单
it should be relatively straightforward to implement a version of FileChannel which works with a SmbRandomAccessFile
我刚刚在Eclipse中一个名为 smb4jackcess 的Maven项目中进行了尝试，并且无需编写太多代码就可以使它工作.我创建的类名为 SmbFileChannel :
I just tried it in a Maven project named smb4jackcess in Eclipse, and I got it working without having to write too much code. The class I created is named SmbFileChannel:
// FileChannel using jcifs.smb.SmbRandomAccessFile
package smb4jackcess;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import jcifs.smb.SmbException;
import jcifs.smb.SmbFile;
import jcifs.smb.SmbRandomAccessFile;
public class SmbFileChannel extends FileChannel {
private final SmbRandomAccessFile _file;
private long _length;
public SmbFileChannel(String smbURL) throws SmbException, MalformedURLException, UnknownHostException {
_file = new SmbRandomAccessFile(smbURL, "rw", SmbFile.FILE_NO_SHARE);
_length = _file.length();
}
@Override
public void force(boolean metaData) throws SmbException, MalformedURLException, UnknownHostException {
// do nothing
}
@Override
public FileLock lock(long position, long size, boolean shared) {
throw new UnsupportedOperationException();
}
@Override
public MappedByteBuffer map(MapMode mode, long position, long size) {
throw new UnsupportedOperationException();
}
@Override
public long position() throws SmbException {
return _file.getFilePointer();
}
@Override
public FileChannel position(long newPosition) throws SmbException {
_file.seek(newPosition);
return this;
}
@Override
public int read(ByteBuffer dst) {
throw new UnsupportedOperationException();
}
@Override
public int read(ByteBuffer dst, long position) throws SmbException {
byte[] b = new byte[dst.remaining()];
_file.seek(position);
int bytesRead =_file.read(b);
dst.put(b);
return bytesRead;
}
@Override
public long read(ByteBuffer[] dsts, int offset, int length) {
throw new UnsupportedOperationException();
}
@Override
public long size() throws SmbException {
return _length;
}
@Override
public long transferFrom(ReadableByteChannel src, long position, long count) throws IOException {
ByteBuffer bb = ByteBuffer.allocate((int)count);
int bytesWritten = src.read(bb);
bb.rewind();
bb.limit(bytesWritten);
this.write(bb, position);
return bytesWritten;
}
@Override
public long transferTo(long position, long count, WritableByteChannel target) {
throw new UnsupportedOperationException();
}
@Override
public FileChannel truncate(long newSize) throws SmbException {
if (newSize < 0L) {
throw new IllegalArgumentException("negative size");
}
_file.setLength(newSize);
_length = newSize;
return this;
}
@Override
public FileLock tryLock(long position, long size, boolean shared) {
throw new UnsupportedOperationException();
}
@Override
public int write(ByteBuffer src) throws SmbException {
throw new UnsupportedOperationException();
}
@Override
public int write(ByteBuffer src, long position) throws SmbException {
byte[] b = new byte[src.remaining()];
src.get(b);
_file.seek(position);
_file.write(b);
long endPos = position + b.length;
if(endPos > _length) {
_length = endPos;
}
return b.length;
}
@Override
public long write(ByteBuffer[] srcs, int offset, int length) {
throw new UnsupportedOperationException();
}
@Override
protected void implCloseChannel() throws SmbException {
_file.close();
}
}
我使用的主要课程是
package smb4jackcess;
import java.nio.channels.FileChannel;
import com.healthmarketscience.jackcess.Column;
import com.healthmarketscience.jackcess.ColumnBuilder;
import com.healthmarketscience.jackcess.DataType;
import com.healthmarketscience.jackcess.Database;
import com.healthmarketscience.jackcess.Database.FileFormat;
import com.healthmarketscience.jackcess.DatabaseBuilder;
import com.healthmarketscience.jackcess.IndexBuilder;
import com.healthmarketscience.jackcess.Table;
import com.healthmarketscience.jackcess.TableBuilder;
public class Smb4jackcessMain {
public static void main(String[] args) {
String smbURL = "smb://gord:mypassword@SERVERNAME/sharename/etc/newdb.accdb";
try (SmbFileChannel sfc = new SmbFileChannel(smbURL)) {
// create a brand new database file
Database db = new DatabaseBuilder()
.setChannel(sfc)
.setFileFormat(FileFormat.V2010)
.create();
// add a table to it
Table newTable = new TableBuilder("NewTable")
.addColumn(new ColumnBuilder("ID", DataType.LONG)
.setAutoNumber(true))
.addColumn(new ColumnBuilder("TextField", DataType.TEXT))
.addIndex(new IndexBuilder(IndexBuilder.PRIMARY_KEY_NAME)
.addColumns("ID").setPrimaryKey())
.toTable(db);
// insert a row into the table
newTable.addRow(Column.AUTO_NUMBER, "This is a new row.");
db.close();
} catch (Exception e) {
e.printStackTrace(System.err);
}
}
}
2016-02-04 更新: 代码改进.非常感谢Dell Boomi的James的帮助！
Updated 2016-02-04: Code improvements. Many thanks to James at Dell Boomi for his assistance!
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