我正在创建一个应用程序。我想上传一个图像并保存到我的数据库..当我运行我的应用程序时,它成功运行小尺寸图像,但我无法将大尺寸图像保存到我的数据库..当我保存大尺寸图像,如2 MB它会提示错误,如
com.mysql.jdbc.PacketTooBigException:查询的数据包太大(2491559> 1048576)。您可以通过设置max_allowed_packet'来更改服务器上的此值。变量
为什么会出现这样的错误..我可以解决它 这个我的代码
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt){
if (evt.getSource() == jButton1)
{
int x = 0;
String s1 = jTextField1.getText().trim();
String s2 = jTextField2.getText();
char[] s3 = jPasswordField1.getPassword();
char[] s4 = jPasswordField2.getPassword();
String s8 = new String(s3);
String s9 = new String(s4);
String s5 = jTextField5.getText();
String s6 = jTextField6.getText();
String s7 = jTextField7.getText();
if(s8.equals(s9))
{
try
{
File image1 = new File(filename);
FileInputStream fis = new FileInputStream(image1);
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte buf[] = new byte[1024];
for (int readNum; (readNum = fis.read(buf)) != -1;) {
bos.write(buf, 0, readNum);
}
cat_image = bos.toByteArray();
System.out.println(cat_image.length);
PreparedStatement ps = conn.prepareStatement("insert into reg values(?,?,?,?,?,?,?)");
ps.setString(1, s1);
ps.setString(2, s2);
ps.setString(3, s8);
ps.setString(4, s5);
ps.setString(5, s6);
ps.setString(6, s7);
ps.setBytes(7, cat_image);
int rs = ps.executeUpdate();
x++;
if (x > 0)
{
JOptionPane.showMessageDialog(jButton1, "Data Saved Successfully");
}
}
catch(Exception e)
{
System.out.println(e);
}
}
else
{
JOptionPane.showMessageDialog(jButton1, "Password Dosn't match");
}
}
else
{
jTextField1.setText("");
jTextField2.setText("");
jPasswordField1.setText("");
jPasswordField2.setText("");
jTextField5.setText("");
jTextField6.setText("");
jTextField7.setText("");
}
// TODO add your handling code here:
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt){
jTextField1.setText("");
jTextField2.setText("");
jPasswordField1.setText("");
jPasswordField2.setText("");
jTextField5.setText("");
jTextField6.setText("");
jTextField7.setText("");
// TODO add your handling code here:
}
private void jButton3ActionPerformed(java.awt.event.ActionEvent evt){
JFileChooser chooser = new JFileChooser();
chooser.showOpenDialog(null);
File f = chooser.getSelectedFile();
filename = f.getAbsolutePath();
jTextField3.setText(filename);
// int returnVal = chooser.showOpenDialog(null);
//if(returnVal == JFileChooser.APPROVE_OPTION) {
ImageIcon icon=new ImageIcon(filename);
jLabel8.setIcon(icon);
//}
// TODO add your handling code here:
}
答案 0 :(得分:1)
正如异常所述,问题与服务器的max_allowed_packet变量有关,该变量定义了一个数据包的最大大小。请参阅Packet Too Large主题,该主题介绍如何修改服务器的配置文件以增加此变量的值。有关配置文件的更多详细信息,另请参阅Using Option Files。