Java生成數字_字母_中文混合驗證碼源碼

1、Java生成數字_字母_中文混合驗證碼源碼 此實例只對驗證碼的生成做專門的詳述。 首先，創(chuàng)建一個jsp頁面 我命名為：valicodejt.jsp 代碼如下： 英文、數字和中文混合的彩色驗證碼 function checkform(myform) for(i=0;imyform.length;i+) if(myform.elementsi.value=) alert(myform.elementsi.title+不能為空！); myform.elementsi.focus(); return false; function myReload() /document.getElementById

2、x_x(createCheckCode).src=PictureCheckCode; document.getElementByIdx_x(createCheckCode).src=document.getElementByIdx_x(createCheckCode).src+?nocache=+new Date().getTime();         用戶名： 密  碼： 驗證碼：  看不清?換一個             前臺的技術暫且不做過深討論，我們主要講

3、一下后臺的驗證碼是怎么生成的， 每步功能請看注釋： import java.awt.*; import java.awt.geom.*; import java.awt.image.BufferedImage; import java.io.IOException; import java.util.Random; import javax.imageio.ImageIO; impo rt javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpSe

4、rvletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; public class PictureCheckCode extends HttpServlet / 獲取隨機顏色 public Color getRandColor(int s, int e) Random random = new Random(); if (s 255) s = 255; if (e 255) e = 255; int r = s + random.nextInt(e -

5、s); /隨機生成RGB顏色中的r值 int g = s + random.nextInt(e - s); /隨機生成RGB顏色中的g值 int b = s + random.nextInt(e - s); /隨機生成RGB顏色中的b值 return new Color(r, g, b); public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException response.setHeader(Pragma, No-cache); r

6、esponse.setHeader(Cache-Control, No-cache); response.setDateHeader(Expires, 0); / 指定生成的響應是圖片 response.setContentType(image/jpeg); int width = 86; int height = 22; BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); Graphics g = image.getGraphics(); Graphics2D g2d = (G

7、raphics2D) g; Random random = new Random(); Font mFont = new Font(黑體, Font.BOLD, 17); g.setColor(getRandColor(200, 250); g.fillRect(0, 0, width, height); g.setFont(mFont); g.setColor(getRandColor(180, 200); / 畫隨機的線條 for (int i = 0; i 100; i+) int x = random.nextInt(width - 1); int y = random.nextInt

8、(height - 1); int x1 = random.nextInt(6) + 1; int y1 = random.nextInt(12) + 1; BasicStroke bs = new BasicStroke(2f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL); Line2D line = new Line2D.Double(x, y, x + x1, y + y1); g2d.setStroke(bs); g2d.draw(line); String sRand = ; / 輸出隨機的驗證文字 String ctmp = ; int itmp = 0; for (int i = 0; i 1f) scaleSize = 1f; trans.scale(scaleSize, scaleSize); g2d_word.setTransform(trans); g.drawString(ctmp, 15 * i + 18, 14); / 將生成的驗證碼保存到Session中 HttpSession session = re