Java聊天室程序源码 Java即时通讯代码 Java局域网聊天系统  Java即时通讯 Java聊天系统

public Swingtest002() {
		// 设置标题
		setTitle("请登陆");
		// 绝对布局
		setLayout(null);
		// 定义一个容器
		Container c = getContentPane();
		// 创建"用户名:"标签
		JLabel jl1 = new JLabel("用户名：");
		// 创建文本框
		final JTextField jtf1 = new JTextField();
		// 创建"密码:"标签
		JLabel jl2 = new JLabel("密码:");
		// 创建密码框
		final JPasswordField jpf1 = new JPasswordField();
		// 设置密码字符为*
		jpf1.setEchoChar('*');
		// 创建"提交"按钮
		JButton jb1 = new JButton("提交");
		// 创建"重置"按钮
		JButton jb2 = new JButton("重置");
		
		// 当用户名为"mr",密码为"mrsoft"时点击"提交"按钮弹出"登录成功"提示对话框
		jb1.addActionListener(new ActionListener() {
 
			@Override
			public void actionPerformed(ActionEvent e) {
 
				String  name=(String)jtf1.getText().trim();
				String  password=new String(jpf1.getText().trim());
				String sql="select * from user where name='"+name+"' and pass='"+password+"'";
			System.out.println("name"+name+"password"+password);
				// TODO Auto-generated method stub
				try {
					ResultSet rs=st.executeQuery(sql);
					if (rs.next()) {
						JOptionPane.showMessageDialog(null, "登陆成功！");
						this.setVisible(false);//关闭当前的窗体
					
						MainFrame  mainframe=new MainFrame();
					
						
						
					} else if (jtf1.getText().trim().length() == 0 || new String(jpf1.getPassword()).trim().length() == 0) {
						JOptionPane.showMessageDialog(null, "不能为空!");
					} else {
						JOptionPane.showMessageDialog(null, "错误");
						// 清零
						jtf1.setText("");
						jpf1.setText("");
					}
				} catch (HeadlessException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				} catch (SQLException e1) {
					// TODO Auto-generated catch block
					e1.printStackTrace();
				}
 
			}
 
			private void setVisible(boolean b) {
				// TODO Auto-generated method stub
				
			}
		});