从查询出来的结果集获取Blob数据（以图片为例）

从数据库中读出文件类型为Blob文件:html

Connection conn=null;
PrepatedStatement pstmt=null;
ResultSet resultSet=null;
try{
connection=JDBCTools.getConnection();
String sql="Select id,name customerName,email,birth from customers where id=13";
preparedStatement=connection.prepareStatement(sql);
resultSet=preparedStatement.executeQuery();
if(resultSet.next()){
int id=resultSet.getInt(1);
String name=resultSet.getString(2);
System.out.println(id+" "+name);
Blob picture=resultSet.getBlob(4);
InputStream in=picture.getBinaryStream();
OutputStream out=new FileOutputStream("flower.jpg");
byte[] buffer=new byte[1024];
while((len=in.read(buffer))!=-1){
  out.write(buffer,0,len);
}
out.close();
in.close();
}
}catch(Exception e){
e.printStackTrace();
}finally{
JDBCTools.releaseDB(resultSet,preparedStatement,connectuon);
}