Question

我试图在用户使用Java登录系统后显示用户名。有什么办法吗？

login.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            // JDBC driver name and database URL
               final String JDBC_DRIVER = "com.mysql.jdbc.Driver";  
                final String DB_URL = "jdbc:mysql://localhost/unimas";

               //  Database credentials
                final String USER = "root";
                final String PASS = "shojib420";
                Connection conn = null;
                Statement stmt = null;
                try {
                    dec();
                } catch (NoSuchAlgorithmException e2) {
                    // TODO Auto-generated catch block
                    e2.printStackTrace();
                }
            //String name=name2.getText();
            String username=user1.getText();
            //String faculty=fac1.getText();
            if(username.equalsIgnoreCase("") ||  password.equalsIgnoreCase(""))
            {
                JOptionPane.showMessageDialog(contentPane, "OOPS You miss some filed");
            }
            else
            {
            try {

                  Class.forName("com.mysql.jdbc.Driver");
                  conn = (Connection) DriverManager.getConnection(DB_URL, USER, PASS);
                  stmt = (Statement) conn.createStatement();

              /* String sql="INSERT INTO useruser " +
                       "VALUES (username,password, name,faculty)";*/
                String sql="SELECT * FROM useruser WHERE username='"+username+"' and password='"+password+"' ";

               ResultSet rs=stmt.executeQuery(sql);
               if(rs.next())
               {

                   dashboard d=new dashboard();
                   d.setVisible(true);
                   d.name=username;
                   dispose();

               }
               else
               {
                   JOptionPane.showMessageDialog(contentPane, "Sorry "+password);
               }

            }catch(SQLException se){
                  //Handle errors for JDBC
                  se.printStackTrace();
               }catch(Exception e1){
                      //Handle errors for Class.forName
                      e1.printStackTrace();
                   }
            }

        }
    });

此处d.name=username;名称位于我尝试设置d.name=username;的信息中心类中，但我无法获取用户名的值

    JTextArea showName = new JTextArea();
    showName.setBounds(29, 25, 105, 22);
    contentPane.add(showName);
    showName.setName(name);

我在仪表板类中调用该名称。知道我做错了什么或者更好的建议吗？

Answer 1

dashboard d=new dashboard();
d.setVisible(true);
d.name=username;

这里你只是设置了类变量，但是没有在任何标签（或textarea或textfield）中设置变量。

应该是

dashboard d=new dashboard();
d.nameLabel.setText(username);
d.setVisible(true);

成功登录后如何获取用户名？

1 个答案: