java生成验证码图片

 

很久没写博客了，都快忘记这里有账号了。好了，不罗嗦，跟大家分享下生成验证码图片代码

import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.util.Random;import javax.imageio.ImageIO;import javax.imageio.stream.FileImageOutputStream;public class ValidateCode {/** * 验证码属性名称 */public static final String VALIDATE_CODE_NAME = "validate_code";char[] codeSequence = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };/** * 验证码图片的宽度。 */private int width = 75;/** * 验证码图片的高度。 */private int height = 20;/** * 验证码字符个数 */private int codeCount = 4;/** * xx */private int xx = 0;/** * 字体高度 */private int fontHeight;/** * codeY */private int codeY;public ValidateCode() {xx = width / (codeCount + 1);fontHeight = height - 2;codeY = height - 4;}public void getValidateImage() {// 定义图像bufferBufferedImage buffImg = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);Graphics2D gd = buffImg.createGraphics();// 创建一个随机数生成器类Random random = new Random();// 将图像填充为白色gd.setColor(Color.WHITE);gd.fillRect(0, 0, width, height);// 创建字体，字体的大小应该根据图片的高度来定。Font font = new Font("Fixedsys", Font.BOLD, fontHeight);// 设置字体。gd.setFont(font);// 画边框。gd.setColor(Color.BLACK);gd.drawRect(0, 0, width - 1, height - 1);// 随机产生160条干扰线，使图象中的认证码不易被其它程序探测到。gd.setColor(Color.BLACK);for (int i = 0; i < 10; i++) {int x = random.nextInt(width);int y = random.nextInt(height);int xl = random.nextInt(12);int yl = random.nextInt(12);gd.drawLine(x, y, x + xl, y + yl);}// randomCode用于保存随机产生的验证码，以便用户登录后进行验证。StringBuffer randomCode = new StringBuffer();int red = 0, green = 0, blue = 0;// 随机产生codeCount数字的验证码。for (int i = 0; i < 4; i++) {// 得到随机产生的验证码数字。String strRand = String.valueOf(codeSequence[random.nextInt(10)]);// 产生随机的颜色分量来构造颜色值，这样输出的每位数字的颜色值都将不同。red = random.nextInt(255);green = random.nextInt(255);blue = random.nextInt(255);// 用随机产生的颜色将验证码绘制到图像中。gd.setColor(new Color(red, green, blue));gd.drawString(strRand, (i + 1) * xx, codeY);// 将产生的四个随机数组合在一起。randomCode.append(strRand);}try {FileImageOutputStream writeImage = new FileImageOutputStream(new File("c:\\pic.jpg"));ImageIO.write(buffImg, "jpeg", writeImage);writeImage.close();} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}}public static void main(String[] args) {ValidateCode vc = new ValidateCode();vc.getValidateImage();}}