import="java.util.*,java.awt.*,java.awt.p_w_picpath.*,com.sun.p_w_picpath.codec.jpeg.*,java.util.*,javax.p_w_picpathio.*,java.io.OutputStream"
pageEncoding="GBK" session="true"%>
<html>
<head>
<title>verify</title>
</head>
<body>
<%!Color getRandColor(int fc, int bc) {
Random random = new Random();
if (fc > 255)
fc = 255;
if (bc > 255)
bc = 255;
int r = fc + random.nextInt(bc - fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}%>
<%
//設置頁面不緩存
response.setHeader("Pragma", "No-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
// 在內存中創建圖象
int width = 60, height = 20;
BufferedImage p_w_picpath = new BufferedImage(width, height,
BufferedImage.TYPE_INT_RGB);
// 獲取圖形上下文
Graphics g = p_w_picpath.getGraphics();
//生成隨機類
Random random = new Random();
// 設定背景色
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, width, height);
//設定字體
g.setFont(new Font("MV Boli", Font.PLAIN, 18));
//畫邊框
//g.setColor(new Color());
//g.drawRect(0,0,width-1,height-1);
// 隨機產生155條幹擾線，使圖象中的認證碼不易被其它程序探測到
g.setColor(getRandColor(160, 200));
for (int i = 0; i < 155; i++) {
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt(12);
int yl = random.nextInt(12);
g.drawLine(x, y, x + xl, y + yl);
}
// 取隨機產生的認證碼(4位數字)
String sRand = "";
for (int i = 0; i < 4; i++) {
String rand = String.valueOf(random.nextInt(10));
sRand += rand;
// 將認證碼顯示到圖象中
g.setColor(new Color(20 + random.nextInt(110), 20 + random
.nextInt(110), 20 + random.nextInt(110)));//調用函數出來的顏色相同，可能是因爲種子太接近，所以只能直接生成
g.drawString(rand, 13 * i + 6, 16);
}
// 將認證碼存入SESSION
session.setAttribute("Random", sRand);
// 圖象生效
g.dispose();
ImageIO.write(p_w_picpath, "JPEG", response.getOutputStream());
out.clear();
out = pageContext.pushBody();
%>
</body>
</html>
彩色驗證碼
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