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[Java教程]自己封装的一个java图片验证码


验证码生成器:

 

 1 package com.lz.Tools; 2  3 import java.awt.Color; 4 import java.awt.Font; 5 import java.awt.Graphics; 6 import java.awt.Graphics2D; 7 import java.awt.image.BufferedImage; 8 import java.util.Random; 9  10 /** 11  * 验证码生成器 12  *  13  * @author bojiangzhou 14 */ 15 public class VCodeGenerator { 16    17   /** 18    * 验证码来源 19   */ 20   final private char[] code = { 21     '2', '3', '4', '5', '6', '7', '8', '9', 22     'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 23     'k', 'm', 'n', 'p', 'q', 'r', 's', 't', 'u', 'v',  24     'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 25     'G', 'H', 'J', 'K', 'L', 'M', 'N', 'P', 'Q', 'R', 26     'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z' 27   }; 28   /** 29    * 字体 30   */ 31   final private String[] fontNames = new String[]{ 32       "黑体", "宋体", "Courier", "Arial",  33       "Verdana", "Times", "Tahoma", "Georgia"}; 34   /** 35    * 字体样式 36   */ 37   final private int[] fontStyles = new int[]{ 38       Font.BOLD, Font.ITALIC|Font.BOLD 39   }; 40    41   /** 42    * 验证码长度 43    * 默认4个字符 44   */ 45   private int vcodeLen = 4; 46   /** 47    * 验证码图片字体大小 48    * 默认17 49   */ 50   private int fontsize = 21; 51   /** 52    * 验证码图片宽度 53   */ 54   private int width = (fontsize+1)*vcodeLen+10; 55   /** 56    * 验证码图片高度 57   */ 58   private int height = fontsize+12; 59   /** 60    * 干扰线条数 61    * 默认3条 62   */ 63   private int disturbline = 3; 64    65    66   public VCodeGenerator(){} 67    68   /** 69    * 指定验证码长度 70    * @param vcodeLen 验证码长度 71   */ 72   public VCodeGenerator(int vcodeLen) { 73     this.vcodeLen = vcodeLen; 74     this.width = (fontsize+1)*vcodeLen+10; 75   } 76    77   /** 78    * 生成验证码图片 79    * @param vcode 要画的验证码 80    * @param drawline 是否画干扰线 81    * @return 82   */ 83   public BufferedImage generatorVCodeImage(String vcode, boolean drawline){ 84     //创建验证码图片 85     BufferedImage vcodeImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 86     Graphics g = vcodeImage.getGraphics(); 87     //填充背景色 88     g.setColor(new Color(246, 240, 250)); 89     g.fillRect(0, 0, width, height); 90     if(drawline){ 91       drawDisturbLine(g); 92     } 93     //用于生成伪随机数 94     Random ran = new Random(); 95     //在图片上画验证码 96     for(int i = 0;i < vcode.length();i++){ 97       //设置字体 98       g.setFont(new Font(fontNames[ran.nextInt(fontNames.length)], fontStyles[ran.nextInt(fontStyles.length)], fontsize)); 99       //随机生成颜色100       g.setColor(getRandomColor());101       //画验证码102       g.drawString(vcode.charAt(i)+"", i*fontsize+10, fontsize+5);103     }104     //释放此图形的上下文以及它使用的所有系统资源105     g.dispose();106     107     return vcodeImage;108   }109   /**110    * 获得旋转字体的验证码图片111    * @param vcode112    * @param drawline 是否画干扰线113    * @return114   */115   public BufferedImage generatorRotateVCodeImage(String vcode, boolean drawline){116     //创建验证码图片117     BufferedImage rotateVcodeImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);118     Graphics2D g2d = rotateVcodeImage.createGraphics();119     //填充背景色120     g2d.setColor(new Color(246, 240, 250));121     g2d.fillRect(0, 0, width, height);122     if(drawline){123       drawDisturbLine(g2d);124     }125     //在图片上画验证码126     for(int i = 0;i < vcode.length();i++){127       BufferedImage rotateImage = getRotateImage(vcode.charAt(i));128       g2d.drawImage(rotateImage, null, (int) (this.height * 0.7) * i, 0);129     }130     g2d.dispose();131     return rotateVcodeImage;132   }133   /**134    * 生成验证码135    * @return 验证码136   */137   public String generatorVCode(){138     int len = code.length;139     Random ran = new Random();140     StringBuffer sb = new StringBuffer();141     for(int i = 0;i < vcodeLen;i++){142       int index = ran.nextInt(len);143       sb.append(code[index]);144     }145     return sb.toString();146   }147   /**148    * 为验证码图片画一些干扰线149    * @param g 150   */151   private void drawDisturbLine(Graphics g){152     Random ran = new Random();153     for(int i = 0;i < disturbline;i++){154       int x1 = ran.nextInt(width);155       int y1 = ran.nextInt(height);156       int x2 = ran.nextInt(width);157       int y2 = ran.nextInt(height);158       g.setColor(getRandomColor());159       //画干扰线160       g.drawLine(x1, y1, x2, y2);161     }162   }163   /**164    * 获取一张旋转的图片165    * @param c 要画的字符166    * @return167   */168   private BufferedImage getRotateImage(char c){169     BufferedImage rotateImage = new BufferedImage(height, height, BufferedImage.TYPE_INT_ARGB);170     Graphics2D g2d = rotateImage.createGraphics();171     //设置透明度为0172     g2d.setColor(new Color(255, 255, 255, 0));173     g2d.fillRect(0, 0, height, height);174     Random ran = new Random();175     g2d.setFont(new Font(fontNames[ran.nextInt(fontNames.length)], fontStyles[ran.nextInt(fontStyles.length)], fontsize));176     g2d.setColor(getRandomColor());177     double theta = getTheta();178     //旋转图片179     g2d.rotate(theta, height/2, height/2);180     g2d.drawString(Character.toString(c), (height-fontsize)/2, fontsize+5);181     g2d.dispose();182     183     return rotateImage;184   }185   /**186    * @return 返回一个随机颜色187   */188   private Color getRandomColor(){189     Random ran = new Random();190     return new Color(ran.nextInt(220), ran.nextInt(220), ran.nextInt(220)); 191   }192   /**193    * @return 角度194   */195   private double getTheta(){196     return ((int) (Math.random()*1000) % 2 == 0 ? -1 : 1)*Math.random();197   }198 199   /**200    * @return 验证码字符个数201   */202   public int getVcodeLen() {203     return vcodeLen;204   }205   /**206    * 设置验证码字符个数207    * @param vcodeLen208   */209   public void setVcodeLen(int vcodeLen) {210     this.width = (fontsize+3)*vcodeLen+10;211     this.vcodeLen = vcodeLen;212   }213   /**214    * @return 字体大小215   */216   public int getFontsize() {217     return fontsize;218   }219   /**220    * 设置字体大小221    * @param fontsize222   */223   public void setFontsize(int fontsize) {224     this.width = (fontsize+3)*vcodeLen+10;225     this.height = fontsize+15;226     this.fontsize = fontsize;227   }228   /**229    * @return 图片宽度230   */231   public int getWidth() {232     return width;233   }234   /**235    * 设置图片宽度236    * @param width237   */238   public void setWidth(int width) {239     this.width = width;240   }241   /**242    * @return 图片高度243   */244   public int getHeight() {245     return height;246   }247   /**248    * 设置图片高度249    * @param height 250   */251   public void setHeight(int height) {252     this.height = height;253   }254   /**255    * @return 干扰线条数256   */257   public int getDisturbline() {258     return disturbline;259   }260   /**261    * 设置干扰线条数262    * @param disturbline263   */264   public void setDisturbline(int disturbline) {265     this.disturbline = disturbline;266   }267   268 }

 

在servlet里获取验证码

 1 package com.lz.Servlet; 2  3 import java.awt.image.BufferedImage; 4 import java.io.IOException; 5  6 import javax.imageio.ImageIO; 7 import javax.servlet.ServletException; 8 import javax.servlet.http.HttpServlet; 9 import javax.servlet.http.HttpServletRequest;10 import javax.servlet.http.HttpServletResponse;11 12 import com.lz.Tools.VCodeGenerator;13 14 15 16 /**17  * 获取验证码18  * @author bojiangzhou19  *20 */21 public class GetVCodeServlet extends HttpServlet {22 23   private static final long serialVersionUID = 3259532010990625726L;24 25   public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {26     //验证码不能缓存27     response.setHeader("Expires", "-1");28     response.setHeader("cache-control", "no-cahce");29     response.setHeader("pragma", "no-cache");30     31     VCodeGenerator vcg = new VCodeGenerator();32     //取得验证码33     String vcode = vcg.generatorVCode();34     //获取验证码图片35 //    BufferedImage vcodeImage = vcg.generatorRotateVCodeImage(vcode, true);36     BufferedImage vcodeImage = vcg.generatorVCodeImage(vcode, true);37     //将验证码保存到session域对象38     request.getSession().setAttribute("vcode", vcode);39     //输出验证码图片40     ImageIO.write(vcodeImage, "gif", response.getOutputStream());41   }42   43 }

 

前台在img标签里用src获取验证码图片即可

<img class="vcode" src="GetVCodeServlet" />

 

OK!!!

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