import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.sql.Blob;
import java.sql.SQLException;
import javax.servlet.ServletOutputStream;
public class ByteStreamConverter {
// 將流文件轉換為二進制文件
public byte[] toByteArray(Blob fromBlob) {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
try {
return toByteArrayImpl(fromBlob, baos);
} catch (SQLException e) {
throw new RuntimeException(e);
} catch (IOException e) {
throw new RuntimeException(e);
} finally {
if (baos != null) {
try {
baos.close();
} catch (IOException ex) {
}
}
}
}
// 將流文件轉換為二進制文件的實現
public byte[] toByteArrayImpl(Blob fromBlob, ByteArrayOutputStream baos)
throws SQLException, IOException {
byte[] buf = new byte[2048];
InputStream is = fromBlob.getBinaryStream();
try {
for (;;) {
int dataSize = is.read(buf);
if (dataSize == -1)
break;
baos.write(buf, 0, dataSize);
}
} finally {
if (is != null) {
try {
is.close();
} catch (IOException ex) {
}
}
}
return baos.toByteArray();
}
}
posted on 2008-07-10 10:39
Hank1026 閱讀(3034)
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