图形验证码生成工具类

生成验证码效果

 

 

 

 

ValidateCode.java 验证码生成类

 package cn.dsna.util.images;

 import java.awt.Color;
 import java.awt.Font;
 import java.awt.Graphics2D;
 import java.awt.image.BufferedImage;
 import java.io.FileOutputStream;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.util.Random;

 import javax.imageio.ImageIO;
 /**
  * 验证码生成器
  * @author dsna
  *
  */
 public class ValidateCode {
     // 图片的宽度。
     private int width = 160;
     // 图片的高度。
     private int height = 40;
     // 验证码字符个数
     private int codeCount = 5;
     // 验证码干扰线数
     private int lineCount = 150;
     // 验证码
     private String code = null;
     // 验证码图片Buffer
     private BufferedImage buffImg=null;

     private char[] codeSequence = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
             'K', 'L', 'M', 'N',  'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
             'X', 'Y', 'Z',  '1', '2', '3', '4', '5', '6', '7', '8', '9' };

     public  ValidateCode() {
         this.createCode();
     }

     /**
      *
      * @param width 图片宽
      * @param height 图片高
      */
     public  ValidateCode(int width,int height) {
         this.width=width;
         this.height=height;
         this.createCode();
     }
     /**
      *
      * @param width 图片宽
      * @param height 图片高
      * @param codeCount 字符个数
      * @param lineCount 干扰线条数
      */
     public  ValidateCode(int width,int height,int codeCount,int lineCount) {
         this.width=width;
         this.height=height;
         this.codeCount=codeCount;
         this.lineCount=lineCount;
         this.createCode();
     }

     public void createCode() {
         int x = 0,fontHeight=0,codeY=0;
         int red = 0, green = 0, blue = 0;

         x = width / (codeCount +2);//每个字符的宽度
         fontHeight = height - 2;//字体的高度
         codeY = height - 4;

         // 图像buffer
         buffImg = new BufferedImage(width, height,BufferedImage.TYPE_INT_RGB);
         Graphics2D g = buffImg.createGraphics();
         // 生成随机数
         Random random = new Random();
         // 将图像填充为白色
         g.setColor(Color.WHITE);
         g.fillRect(0, 0, width, height);
         // 创建字体
         ImgFontByte imgFont=new ImgFontByte();
         Font font =imgFont.getFont(fontHeight);
         g.setFont(font);

         for (int i = 0; i < lineCount; i++) {
             int xs = random.nextInt(width);
             int ys = random.nextInt(height);
             int xe = xs+random.nextInt(width/8);
             int ye = ys+random.nextInt(height/8);
             red = random.nextInt(255);
             green = random.nextInt(255);
             blue = random.nextInt(255);
             g.setColor(new Color(red, green, blue));
             g.drawLine(xs, ys, xe, ye);
         }

         // randomCode记录随机产生的验证码
         StringBuffer randomCode = new StringBuffer();
         // 随机产生codeCount个字符的验证码。
         for (int i = 0; i < codeCount; i++) {
             String strRand = String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);
             // 产生随机的颜色值，让输出的每个字符的颜色值都将不同。
             red = random.nextInt(255);
             green = random.nextInt(255);
             blue = random.nextInt(255);
             g.setColor(new Color(red, green, blue));
             g.drawString(strRand, (i + 1) * x, codeY);
             // 将产生的四个随机数组合在一起。
             randomCode.append(strRand);
         }
         // 将四位数字的验证码保存到Session中。
         code=randomCode.toString();
     }

     public void write(String path) throws IOException {
         OutputStream sos = new FileOutputStream(path);
             this.write(sos);
     }

     public void write(OutputStream sos) throws IOException {
             ImageIO.write(buffImg, "png", sos);
             sos.close();
     }
     public BufferedImage getBuffImg() {
         return buffImg;
     }

     public String getCode() {
         return code;
     }
 }

 

ImgFontByte.java

 package cn.dsna.util.images;
 import java.io.ByteArrayInputStream;
 import java.awt.*;
 /**
  * ttf字体文件
  * @author dsna
  *
  */
 public class ImgFontByte {
     public Font getFont(int fontHeight){
         try {
             Font baseFont = Font.createFont(Font.TRUETYPE_FONT, new ByteArrayInputStream(hex2byte(getFontByteStr())));
             return baseFont.deriveFont(Font.PLAIN, fontHeight);
         } catch (Exception e) {
             return new Font("Arial",Font.PLAIN, fontHeight);
         }
     }

     private  byte[] hex2byte(String str) {
         if (str == null)
             return null;
         str = str.trim();
         int len = str.length();
         if (len == 0 || len % 2 == 1)
             return null;

         byte[] b = new byte[len / 2];
         try {
             for (int i = 0; i < str.length(); i += 2) {
                 b[i / 2] = (byte) Integer
                         .decode("0x" + str.substring(i, i + 2)).intValue();
             }
             return b;
         } catch (Exception e) {
             return null;
         }
     } /**
   * ttf字体文件的十六进制字符串
   * @return
   */
  private String getFontByteStr(){ return null;
         return str;//字符串太长 在附件中找
 }
 }

 

 ValidateCodeServlet.java Servlet调用方法 

 package cn.dsna.util.images;

 import java.io.IOException;
 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 import javax.servlet.http.HttpSession;

 public class ValidateCodeServlet extends HttpServlet {
     private static final long serialVersionUID = 1L;

     @Override
     protected void doGet(HttpServletRequest reqeust,
             HttpServletResponse response) throws ServletException, IOException {
         // 设置响应的类型格式为图片格式
         response.setContentType("image/jpeg");
         //禁止图像缓存。
         response.setHeader("Pragma", "no-cache");
         response.setHeader("Cache-Control", "no-cache");
         response.setDateHeader("Expires", 0);

         HttpSession session = reqeust.getSession();

         ValidateCode vCode = new ValidateCode(120,40,5,100);
         session.setAttribute("code", vCode.getCode());
         vCode.write(response.getOutputStream());
     }
 /**
  * web.xml 添加servlet
     <servlet>
         <servlet-name>validateCodeServlet</servlet-name>
         <servlet-class>cn.dsna.util.images.ValidateCodeServlet</servlet-class>
     </servlet>
     <servlet-mapping>
         <servlet-name>validateCodeServlet</servlet-name>
         <url-pattern>*.images</url-pattern>
     </servlet-mapping>

 在地址栏输入XXX/dsna.images 测试
  */

 }

 测试类

ValidateCodeTest.java

 package cn.dsna.util.images;

 import java.io.IOException;
 import java.util.Date;

 public class ValidateCodeTest {

     /**
      * @param args
      */
     public static void main(String[] args) {
         ValidateCode vCode = new ValidateCode(120,40,5,100);
         try {
             String path="D:/t/"+new Date().getTime()+".png";
             System.out.println(vCode.getCode()+" >"+path);
             vCode.write(path);
         } catch (IOException e) {
             e.printStackTrace();
         }
     }

 }

 

web.xml 配置

 <servlet>
     <servlet-name>validateCodeServlet</servlet-name>
     <servlet-class>cn.dsna.util.images.ValidateCodeServlet</servlet-class>
 </servlet>
 <servlet-mapping>
     <servlet-name>validateCodeServlet</servlet-name>
     <url-pattern>*.images</url-pattern>
 </servlet-mapping>