MyBatis

                Tbuser record = new Tbuser();
		TbuserWithBLOBs bloBs = tbuserMapper.selectByPrimaryKey((long) 34);
		bloBs.setCardid("00000");
		tbuserMapper.updateByPrimaryKeyWithBLOBs(bloBs);
		
		TbuserExample tbuserExample = new TbuserExample();
		db.TbuserExample.Criteria criteria = tbuserExample.createCriteria();
		criteria.andIdGreaterThan((long) 34);
		List<Tbuser> listtbuser = tbuserMapper.selectByExample(tbuserExample);
		for(Tbuser tbuser : listtbuser) {
			System.out.println(tbuser.getPwd());
		}
		return bloBs.getPwd();

　　

@RequestMapping(value = "/GetHeadImg",method = RequestMethod.GET)
	@ResponseBody
	public ResponseEntity<byte[]> GetHeadImg() {
		TbuserWithBLOBs bloBs = tbuserMapper.selectByPrimaryKey((long) 34);
		HttpHeaders headers = new HttpHeaders();
        headers.set("Content-Type", "image/jpg");
        return new ResponseEntity<byte[]>(bloBs.getUserimg(), headers, HttpStatus.OK);
	}