content: package cn.ymotel.example.imgcode;
  
  import javax.imageio.ImageIO;
  import java.awt.*;
  import java.awt.image.BufferedImage;
  import java.io.FileOutputStream;
  import java.io.IOException;
  import java.io.OutputStream;
  import java.util.Date;
  import java.util.Random;
  
  /** 
   * 验证码生成器 
   * 
   * @author  
   */  
  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;  
    
      // 验证码范围,去掉0(数字)和O(拼音)容易混淆的(小写的1和L也可以去掉,大写不用了)  
      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'};  
    
      /** 
       * 默认构造函数,设置默认参数 
       */  
      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(左右各空出一个字符)  
          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,可以修改为其它的  
          Font font = new Font("Fixedsys", Font.PLAIN, fontHeight);  
  //        Font font = new Font("Times New Roman", Font.ROMAN_BASELINE, fontHeight);  
          g.setFont(font);  
    
          for (int i = 0; i < lineCount; i++) {  
              // 设置随机开始和结束坐标  
              int xs = random.nextInt(width);//x坐标开始  
              int ys = random.nextInt(height);//y坐标开始  
              int xe = xs + random.nextInt(width / 8);//x坐标结束  
              int ye = ys + random.nextInt(height / 8);//y坐标结束  
    
              // 产生随机的颜色值，让输出的每个干扰线的颜色值都将不同。  
              red = random.nextInt(255);  
              green = random.nextInt(255);  
              blue = random.nextInt(255);  
              g.setColor(new Color(red, green, blue));  
              g.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 byte[] writeToBytes() throws IOException {
          java.io.ByteArrayOutputStream bos=new   java.io.ByteArrayOutputStream();
          try {
              ImageIO.write(buffImg, "png", bos);
              return bos.toByteArray();
          } catch (IOException e) {
             return null;
          } finally {
              bos.close();
          }
  
      }
  
      public BufferedImage getBuffImg() {  
          return buffImg;  
      }  
    
      public String getCode() {  
          return code;  
      }  
    
      /** 
       * 测试函数,默认生成到d盘 
       * @param args 
       */  
      public static void main(String[] args) {  
          ValidateCode vCode = new ValidateCode(160,40,5,150);  
          try {  
              String path="g:/tmp/"+new Date().getTime()+".png";
              System.out.println(vCode.getCode()+" >"+path);  
              vCode.write(path);  
          } catch (IOException e) {  
              e.printStackTrace();  
          }  
      }  
  }  