原生Java写法

JLabel jl = new JLabel("这是一个标签");
		jl.setHorizontalAlignment(SwingConstants.CENTER);//center label text
        Font font = new Font("仿宋", Font.PLAIN, 30);
        jl.setFont(font);
        jl.setForeground(new Color(111,222,0));

在Java中引入HTML+CSS

JLabel jl =new JLabel("<html><body>"
				+ "<p style='color :red; font-size:30px; font-family = '宋体''>this is a label!!!</p>"
				+ "</body></html>"); 
		jl.setHorizontalAlignment(SwingConstants.CENTER);