java 创建一个窗口标签上设置图像

package test;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Point;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;


public class test {
    public static void main(String[] args)  {
        JFrame f=new JFrame("Welcom to see LessonsSchedule");
        String picPath="c:"+File.separator+"Users"+File.separator+"SunBoy"+File.separator+"Desktop"+File.separator+"课表.png";
        File file=new File(picPath);
        InputStream ipt=null;
        byte b[]=new byte[(int)file.length()];
        try{
            ipt=new FileInputStream(file);
            ipt.read(b);
            ipt.close();
        }catch (Exception e){
            e.printStackTrace();
        }
        Icon icon=new ImageIcon(b);
        JLabel lab=new JLabel("课表哦，亲",icon,JLabel.CENTER);
        Font fnt=new Font("Serief",Font.ITALIC+Font.BOLD,28);
        lab.setFont(fnt);
        lab.setBackground(Color.YELLOW);
        lab.setForeground(Color.RED);
        f.add(lab);
        Dimension dim=new Dimension();
        dim.setSize(300,300);
        f.setSize(dim);
        f.setBackground(Color.WHITE);
        Point p=new Point(300,200);
        f.setLocation(p);
        f.setVisible(true);
    }
}