網站中的驗證碼，JAVA代碼（javax.script.ScriptEngineManager)

這個包不經常用，需要手動導入，具體代碼如下：

public BufferedImage createCode(User user, long goodsId) {
	if(user==null||goodsId<=0) {
		return null;
	}
	int width=80;
	int height=32;
	//創建一個圖片
	BufferedImage image=new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
	Graphics g=image.getGraphics();
	//設置背景顏色
	g.setColor(new Color(0xDCDCDC));
	g.fillRect(0, 0, width, height);
	//畫邊框
	g.setColor(Color.black);
	g.drawRect(0, 0, width-1, height-1);
	//創建一個隨機序列填充點
	Random rdm=new Random();
	//做50個干擾點
	for (int i = 0; i < 50; i++) {
		int x=rdm.nextInt(width);
		int y=rdm.nextInt(height);
		g.drawOval(x, y, 0, 0);
	}
	//填充隨機代碼
	String verifyCode=appendCode(rdm);
	g.setColor(new Color(0,100,0));
	g.setFont(new Font("Candara",Font.BOLD,24));
	g.drawString(verifyCode,8,24);
	g.dispose();
	int rnd=calc(verifyCode);
	//加入redis將驗證碼
	rs.set(MiaoShaKey.ver_code, user.getMobile()+"，"+goodsId, rnd);
	return image;
}
/*-----------------------分割，補充上面生成Code的代碼------------------------------------------*/
//+ - * 
private static char ops[]=new char[] {'+','-','*'};
private String appendCode(Random rdm) {
	int num1=rdm.nextInt(10);
	int num2=rdm.nextInt(10);
	int num3=rdm.nextInt(10);
	
	char op1=ops[rdm.nextInt(3)];
	char op2=ops[rdm.nextInt(3)];
	
	String exp=""+num1+op1+num2+op2+num3;
	
	return exp;
}
/*-----------------------分割，利用引擎解決計算問題------------------------------------------*/
/*驗證圖形驗證碼   用到scriptEnige圖形引擎*/
@SuppressWarnings("restriction")
private int calc(String verifyCode) {
	try {
		ScriptEngineManager manager=new ScriptEngineManager();
		ScriptEngine engine=manager.getEngineByName("javaScript");
		return (Integer)engine.eval(verifyCode);
	}catch(Exception E){
		E.printStackTrace();
		return 0;
	}
}
}

完成之後，發佈驗證碼：

BufferedImage image=ms.createCode(user,goodsId);
try{
	OutputStream out=response.getOutputStream();
	ImageIO.write(image, "JPEG", out);
	out.flush();
	out.close();
}catch(Exception e){
	e.printStackTrace();
	return Result.error(CodeMsg.SECKILL_ERROR);
}