File file=new File("src\\image\\head.png");
                  FileInputStream fis=new FileInputStream(file);
                  ps.setBinaryStream(10, fis, (int)file.length());

           File file = new File(m.getPicturePath());
           in = new FileInputStream(file);
           ps.setBinaryStream(10, in, (int) file.length());

//其中m为另一个类
             
             //  getPicturePath()方法如下，就是通过文件选择器得到图片的绝对路径

                          JFileChooser fileChooser = new JFileChooser(); // 创建文件对话框
                            // 创建文件过滤
                            FileFilter filter = new FileNameExtensionFilter(
                                    "图像文件(*.gif;*.jpg;*.jpeg;*.png)", "gif",
                                    "jpg", "jpeg", "png");
                            fileChooser.setFileFilter(filter); // 为文件对话框设置文件过滤器
                            int returnValue = fileChooser.showOpenDialog(null);// 打开文件选择对话框
                            if (returnValue == JFileChooser.APPROVE_OPTION) { // 判断是否选择了文件
                               String name=fileChooser.getSelectedFile().getPath();
                               ImageIcon icon=new ImageIcon(name);
                               
                               //等比缩放条件
                               int imgWidth=icon.getIconWidth();
                               int imgHeight=icon.getIconHeight();
                               int conWidth=lbl_picture.getWidth();
                               int conHeight=lbl_picture.getHeight();
                               int reImgWidth;
                               int reImgHeight;
                               if(imgWidth/imgHeight>=conWidth/conHeight){
                                   
                                           if(imgWidth>conWidth){
                                               reImgWidth=conWidth;
                                               reImgHeight=imgHeight*reImgWidth/imgWidth;
                                           }else{
                                               reImgWidth=imgWidth;
                                             reImgHeight=imgHeight;

                                           }
                                 
                               }else{
                                   if(imgWidth>conWidth){
                                    reImgHeight=conHeight;
                                    reImgWidth=imgWidth*reImgHeight/imgHeight;
                                            }else{
                                                      reImgWidth=imgWidth;
                                               reImgHeight=imgHeight;
                                        }

                               }
                                File file = fileChooser.getSelectedFile(); // 获得文件对象
                                picturePath = file.getAbsolutePath();