精品验证码

发布时间:2014-10-23 23:26:50
来源:分享查询网

package com.b2c.action;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.io.IOException;import java.util.Random;import javax.imageio.ImageIO;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;import org.apache.struts2.ServletActionContext;import org.apache.struts2.convention.annotation.Action;import org.apache.struts2.convention.annotation.Namespace;import org.apache.struts2.convention.annotation.ParentPackage;import org.springframework.stereotype.Component;public class DrawImagteCodeAction {     private Color getRandColor(int s, int e) {              Random random = new Random();              if (s > 255)                  s = 255;              if (e > 255)                  e = 255;              int r = random.nextInt(e - s) + s; // 随机生成RGB中的R值              int g = random.nextInt(e - s) + s; // 随机生成RGB中的G值              int b = random.nextInt(e - s) + s; // 随机生成RGB中的B值              return new Color(r, g, b);          }         @Action(value="load_getCode")         public void getCode() throws IOException{              HttpServletResponse response = ServletActionContext.getResponse();            response.setHeader("Pragma", "No-cache");              response.setHeader("Cache-Control", "No-cache");              response.setDateHeader("Expires", 0);              //指定生成的响应图片              response.setContentType("image/jpeg");              int width = 90;                            //指定生成验证码图片的宽度              int heigh = 65;                         //指定生成验证码图片的高度                  //获得图像数据缓冲对象              BufferedImage bi = new BufferedImage(width,heigh,BufferedImage.TYPE_INT_RGB);                  //获得图形上下文的抽象基类              Graphics g = bi.getGraphics();              Random r = new Random();              Font f = new Font("黑体",Font.PLAIN,60);  //定义字体样式              g.setColor(getRandColor(200, 250));     //设置背景颜色              g.fillRect(0, 0, width, heigh);         //绘制背景              g.setFont(f);                           //设置字体              g.setColor(getRandColor(180, 200));     //设置前景颜色                                          Graphics2D g2d = (Graphics2D) g;              //画一条折线                   //BasicStroke bs=new BasicStroke(5f,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL); //创建一个供画笔选择线条粗细的对象              //g2d.setStroke(bs);              //改变线条的粗细              g2d.setColor(Color.DARK_GRAY);      //设置当前颜色为预定义颜色中的深灰色              int[] xPoints=new int[8];              int[] yPoints=new int[8];              for(int j=0;j<8;j++){                  xPoints[j]=r.nextInt(width - 1);                  yPoints[j]=r.nextInt(heigh - 1);              }              g2d.drawPolyline(xPoints, yPoints,4);                            String sRand = "";              String ctmp = "";              int itmp = 0;              for (int i = 0; i < 4; i++) {                  switch (r.nextInt(2)) {                  case 1:                      itmp = r.nextInt(26) + 65; // 生成A~Z的字母                      ctmp = String.valueOf((char) itmp);                      break;                  default:                      itmp = r.nextInt(10) + 48; // 生成0~9的数字                      ctmp = String.valueOf((char) itmp);                      break;                  }                  sRand += ctmp;                  //设置每个字符的随机颜色                  Color color = new Color(20 + r.nextInt(210), 20 + r.nextInt(210), 20 + r.nextInt(210));                  g2d.setColor(color);                  //设置每个字符的随机字体                  g2d.setFont(this.getRandomFont());                  //设置每个字符的随机旋转                  AffineTransform at = new AffineTransform();                  int number = r.nextInt(3)-1;                  double role = number*r.nextDouble()*(Math.PI/4);                  at.setToRotation(role,25*i+5,55-r.nextInt(20)); //role:旋转角度,后面两个参数是设置围绕坐标点旋转                  g2d.setTransform(at);                                    g2d.drawString(ctmp, 20*i+5,50-r.nextInt(10));              }                 HttpSession session = ServletActionContext.getRequest().getSession(true);                 session.setMaxInactiveInterval(5*60);//设置session对象5分钟失效                 session.setAttribute("code", sRand.toString());                       g2d.dispose();                        ImageIO.write(bi, "JPEG", response.getOutputStream());        }                              public static Font getRandomFont() {                    //String[] fonts = {"Georgia", "Verdana", "Arial", "Tahoma", "Time News Roman", "Courier New", "Arial Black", "Quantzite"};                    String[] fonts = {"a_TrianglerCmUp","Astarisborn","WishfulWaves"};                  Random r = new  Random();                 int fontIndex = r.nextInt(fonts.length);                  return new Font(fonts[fontIndex],  r.nextInt(3),50-r.nextInt(20));             }  }

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