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1.将图片存入数据库

 try   {       File f=new File(photopath);//photopath为图片的路径      FileInputStream fis=new FileInputStream(f);      sqlcommand="insert into Directory values('"+name+"','"+na+"','"+tp+"','";      sqlcommand+= mp+"',"+groupid+",?,'"+rm+"')";      ps=mycon.con.prepareStatement(sqlcommand);      ps.setBinaryStream(1,fis,(int)f.length());      ps.executeUpdate();      JOptionPane.showMessageDialog(null,"联系人["+name+"]添加成功!","提示",JOptionPane.PLAIN_MESSAGE);      flag=true;    }    catch(FileNotFoundException fnfe)     {       JOptionPane.showMessageDialog(null,fnfe.getMessage(),"异常",JOptionPane.ERROR_MESSAGE);     }    catch(IOException ioe)     {          JOptionPane.showMessageDialog(null,ioe.getMessage(),"异常",JOptionPane.ERROR_MESSAGE);     } 2.从数据库中读出图片 try  {    MyCon mycon=new MyCon();    Statement stmt=mycon.con.createStatement();    String querycommand="SELECT * FROM Directory, User_Group WHERE ";    querycommand+="Directory.GroupId=User_Group.Group_ID And Name='"+name+"'";    ResultSet rs=stmt.executeQuery(querycommand);    while(rs.next())     {       byte b[] = new byte[10*1024];       int c=0;       try        {          File f = new File("Icon//demo.jpg");//先指定一临时图片,存放从数据库中读出的图片          FileOutputStream fos = new FileOutputStream(f);          InputStream is = rs.getBinaryStream("Photo");          while ((c=is.read(b))!=-1)           {            fos.write(b, 0, c);           }          fos.flush();          fos.close();          is.close();         }//try        catch(FileNotFoundException enfe) { }        catch(IOException ioe)  { }        jbphoto.setIcon(new ImageIcon(b));//将读出的图片设置为按钮的图标      }//while      stmt.close();      mycon.con.close();    }//try    catch(SQLException sqle)  { }   本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/zhangyang0402/archive/2007/06/30/1672965.aspx