网站开发的价钱永久域名查询
一、byte[]=>Blob
我们可以通过Hibernate提供的表态方法来实现如：
org.hibernate.Hibernate.Hibernate.createBlob(new byte[1024]);
二、Blob=>byte[]
目前没有找到好一点的API提供，所以只能自已来实现。示例如下：
/** * 把Blob类型转换为byte数组类型 * @param blob * @return */ private byte[] blobToBytes(Blob blob) { BufferedInputStream is = null; try { is = new BufferedInputStream(blob.getBinaryStream()); byte[] bytes = new byte[(int) blob.length()]; int len = bytes.length; int offset = 0; int read = 0; while (offset < len && (read = is.read(bytes, offset, len - offset)) >= 0) { offset += read; } return bytes; } catch (Exception e) { return null; } finally { try { is.close(); is = null; } catch (IOException e) { return null; } } }三、InputStream=>byte[]
private byte[] InputStreamToByte(InputStream is) throws IOException { ByteArrayOutputStream bytestream = new ByteArrayOutputStream(); int ch; while ((ch = is.read()) != -1) { bytestream.write(ch); } byte imgdata[] = bytestream.toByteArray(); bytestream.close(); return imgdata; }四、byte[]=> InputStream
byte[]到inputStream之间的转换很简单：InputStream is = new ByteArrayInputStream(new byte[1024]);
五、InputStream => Blob
可通过Hibernate提供的API：Hibernate.createBlob(new FileInputStream(" 可以为图片/文件等路径 "));
六、Blob => InputStream
Blog转流，可通过提供的API直接调用：new Blob().getBinaryStream();