java 处理 BLOB OutputStream(插入空的Blob字段到表中)

1.插入占位数据：

insert into TEST_CUICF(t1,t2) values(12,empty_blob())

2.获得占位数据：

select t1,t2 from TEST_CUICF t for update

 

BLOB oracleBlobMockIn = oracleBlobMockIn = control.createMock(BLOB.class);

...

  oracleBlobMockIn.getBinaryStream();
  expectLastCall().andReturn(new FileInputStream(inPdfFile)).times(1);

...

  ResultSet rs = st.executeQuery(sql);
  BLOB oracleBlobMockOut = null;
  if (rs.next()) {
   rs.getString("t1");
   oracleBlobMockOut = (BLOB) rs.getBlob("t2");
  }
...

  control.replay();
  Watermark.addPdfWatermark(oracleBlobMockIn, oracleBlobMockOut, markImagePath);
  control.verify();
  control.reset();

 

3.应用 输出流 (增加水印处理)

 public static void addPdfWatermark(BLOB inputPdfFileBlob, BLOB outPdfFileBlob, String markImagePath) throws Exception {
  if (null == WATERMARK_IMAGE) {
   logger.info("watermark_image inital~~");
   WATERMARK_IMAGE = Image.getInstance(markImagePath);
   WATERMARK_IMAGE.setAbsolutePosition(10, 250);
  }

  PdfReader reader = null;
  PdfStamper stamp = null;
  try {
   reader = new PdfReader(inputPdfFileBlob.getBinaryStream(), "PDF".getBytes());
   stamp = new PdfStamper(reader, outPdfFileBlob.getBinaryOutputStream()); //获得输出流

   int numberOfPages = reader.getNumberOfPages();
   for (int i = 1; i <= numberOfPages; i++) {
    PdfContentByte under = stamp.getUnderContent(i);
    under.addImage(WATERMARK_IMAGE);
   }

  } finally {
   stamp.close();
  }
 }

4.关闭连接

  con.commit();

  con.close();