Clob，Blob，InputStream，byte 互转

编程技术  /  houtizong 发布于 3年前   131

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[]

/*** 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