Struts2（十五）---验证码

第一步:生成验证码图片以及随机产生四位字母

import java.awt.BasicStroke;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.Graphics2D;import java.awt.geom.AffineTransform;import java.awt.image.BufferedImage;import java.util.Random;public class CheckCode {    // 获取随机颜色        public static 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 - s);      //随机生成RGB颜色中的r值            int g = s + random.nextInt(e - s);      //随机生成RGB颜色中的g值            int b = s + random.nextInt(e - s);      //随机生成RGB颜色中的b值            return new Color(r, g, b);        }        //生成随机的四位字母        public static String createSecurityCode() {            String sRand = "";            Random random = new Random();            //输入随机的验证文字            for(int i = 0; i < 4; i++) {                 char ctmp = (char)(random.nextInt(26) + 65);   //生成A~Z的字母                 sRand+=ctmp;            }            return sRand;        }        public static BufferedImage createImage(String sRand) {            int width = 116;            //指定验证码的宽度            int height = 33;            //指定验证码的高度            BufferedImage image = new BufferedImage(width, height,                    BufferedImage.TYPE_INT_RGB);            Graphics g = image.getGraphics();       //获取Graphics类的对象(Java的绘图类)            Random random = new Random();               //实例化一个Random对象            Font mFont = new Font("宋体", Font.BOLD, 22);   //通过Font构造字体            g.fillRect(0, 0, width, height);                //绘制验证码背景            g.setFont(mFont);           //设置字体            g.setColor(getRandColor(180, 200));     //设置颜色            // 画随机的线条            for (int i = 0; i < 100; i++) {                int x = random.nextInt(width - 1);                int y = random.nextInt(height - 1);                int x1 = random.nextInt(3) + 1;                int y1 = random.nextInt(6) + 1;                g.drawLine(x, y, x + x1, y + y1);       //绘制直线            }            /**************************画一条折线********************************/                   BasicStroke bs=new BasicStroke(2f,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL); //创建一个供画笔选择线条粗细的对象            Graphics2D g2d = (Graphics2D) g;    //通过Graphics类的对象创建一个Graphics2D类的对象            g2d.setStroke(bs);                  //改变线条的粗细            g.setColor(Color.GRAY);     //设置当前颜色为预定义颜色中的灰色            int lineNumber=4;       //指定端点的个数            int[] xPoints=new int[lineNumber];      //定义保存x轴坐标的数组            int[] yPoints=new int[lineNumber];      //定义保存x轴坐标的数组            //通过循环为x轴坐标和y轴坐标的数组赋值            for(int j=0;j<lineNumber;j++){                xPoints[j]=random.nextInt(width - 1);                yPoints[j]=random.nextInt(height - 1);            }            g.drawPolyline(xPoints, yPoints,lineNumber);    //绘制折线            /*******************************************************************/             sRand =  createSecurityCode();            // 输出随机的验证文字             for (int i = 0; i < sRand.length(); i++) {               char ctmp = sRand.charAt(i);                Color color = new Color(20 + random.nextInt(110), 20 + random                        .nextInt(110), 20 + random.nextInt(110));                g.setColor(color);              //设置颜色                /** **随机缩放文字并将文字旋转指定角度* */                // 将文字旋转指定角度                Graphics2D g2d_word = (Graphics2D) g;                AffineTransform trans = new AffineTransform();                trans.rotate(random.nextInt(45) * 3.14 / 180, 22 * i + 8, 7);                // 缩放文字                float scaleSize = random.nextFloat() +0.8f;                if (scaleSize > 1f) scaleSize = 1f;                trans.scale(scaleSize, scaleSize);          //进行缩放                g2d_word.setTransform(trans);                /** ********************* */                g.drawString(String.valueOf(ctmp), width/6 * i+23, height/2);            }             g.dispose(); //关闭资源            return image;        }}

第二步:验证码图片与Struts2结合

private InputStream inputStream; public InputStream getInputStream() {        return inputStream;    }public String checkCodeImage() throws IOException {        //获取验证码图片的内容        String sRand = CheckCode.createSecurityCode();        //获取验证码的图片        BufferedImage image = CheckCode.createImage(sRand);        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();        ImageIO.write(image, "jpeg", outputStream);        inputStream = new ByteArrayInputStream(outputStream.toByteArray());        session.put("checkCode", sRand);        return "checkCodeImage";    }Struts.xml<result name="checkCodeImage" type="stream">          <param name="contentType">image/jpeg</param>          <param name="inputStream">inputStream</param>          <param name="bufferSize">2048</param>       </result>jsp页面                                    <!-- 显示验证码 --><img src="../mem-checkCodeImage" name="checkCode" onClick="myReload()" width="116" height="43" class="img_checkcode"  id="img_checkCode" />JS 验证刷新验证码  $(function(){              //点击图片更换验证码              $("#img_checkCode").click(function(){                   $(this).attr("src","front/mem-checkCodeImage?time="+new Date().getTime());               });  })