Clob,Blob,InputStream,byte 互转
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2022-04-23 21:34:27
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一、byte[]=>Blob
我们可以通过Hibernate提供的表态方法来实现如:
二、Blob=>byte[]
三、InputStream=>byte[]
四、byte[] => InputStream
五、InputStream => Blob
可通过Hibernate提供的API:
六、Blob => InputStream
Blog转流,可通过提供的API直接调用:
七、Clob转InputStream
以上均为转载:http://my.oschina.net/zimingforever/blog/81691
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[]
/** * 把Blob类型转换为byte数组类型 * @param blob * <a href="http://my.oschina.net/u/556800" target="_blank" rel="nofollow">@return</a> */ 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
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();
七、Clob转InputStream
InputStream fileOs=null; Clob clob= res.getClob("XXXX"); int i=0; fileOs = clob.getAsciiStream(); int len = (int)clob.length(); byte by[] = new byte[len]; try { while(-1 != (i = fileOs.read(by, 0, by.length))){ fileOs.read(by, 0, i); } } catch (IOException e) { e.printStackTrace(); }
以上均为转载:http://my.oschina.net/zimingforever/blog/81691