Java实现动态获取图片验证码的示例代码

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.io.UnsupportedEncodingException;import java.util.Random;  public class ImgAuthCode {   /**   * 图片的宽度   */  private int width = 330;  /**   * 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;  /**   * 图片验证码类型   */  private ImgCodeType imgCodeType = DEFAULT_TYPE;  /**   * 验证码   */  private String code = null;  /**   * 验证码图片Buffer   */  private BufferedImage buffImg = null;   private static final ImgCodeType DEFAULT_TYPE = ImgCodeType.ENANDNUMBER;   private static 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 ImgAuthCode() {    this.createCode();  }   /**   * @param width 图片宽   * @param height 图片高   */  public ImgAuthCode(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 ImgAuthCode(int width, int height, int codeCount, int lineCount,ImgCodeType imgCodeType) {    this.width = width;    this.height = height;    this.codeCount = codeCount;    this.lineCount = lineCount;    this.imgCodeType = imgCodeType;    this.createCode();  }   public void createCode() {    int x = 0, fontHeight = 0, codeY = 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();    // 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);    Font font=new Font("微软雅黑",Font.PLAIN, fontHeight);    g.setFont(font);    drawRandomLine(g);    // 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 = getRandomStr(imgCodeType);      // 产生随机的颜色值，让输出的每个字符的颜色值都将不同。      g.setColor(getRandomColor());      g.drawString(strRand, (i + 1) * x, codeY);      // 将产生的四个随机数组合在一起。      randomCode.append(strRand);    }    this.code = randomCode.toString();  }   private void drawRandomLine(Graphics g){    //干扰线    for (int i = 0; i < lineCount; i++) {      int xs = new Random().nextInt(width);      int ys = new Random().nextInt(height);      int xe = xs + new Random().nextInt(width / 8);      int ye = ys + new Random().nextInt(height / 8);      g.setColor(getRandomColor());      g.drawLine(xs, ys, xe, ye);    }  }   public Color getRandomColor(){    int red = 0, green = 0, blue = 0;    Random random = new Random();    red = random.nextInt(255);    green = random.nextInt(255);    blue = random.nextInt(255);    return new Color(red,green,blue);  }   public String getRandomStr(ImgCodeType type) {    switch (type) {      case ENANDNUMBER:        return creatENAndNumberCode();      case HAN:        return creatHan();      case EN:        return creatENCode();      case NUMBER:        return creatNumberCode();      default:        return creatENAndNumberCode();    }  }   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();  }   /**   * 单个汉字   *   * @return   */  public static String creatHan() {    String code = "";    Random random = new Random();    //一个汉字两个字节    byte[] bytes = new byte[2];    bytes[0] = Integer.valueOf(176 + Math.abs(random.nextInt(39))).byteValue();    bytes[1] = Integer.valueOf(161 + Math.abs(random.nextInt(93))).byteValue();    try {      code = new String(bytes, "GBK");    } catch (UnsupportedEncodingException e) {      e.printStackTrace();    }    return code;  }   /**   * 英文字母加数字   *   * @return   */  public static String creatENAndNumberCode() {    Random random = new Random();    return String.valueOf(codeSequence[random.nextInt(codeSequence.length)]);  }   /**   * 英文字母   *    *   * @return   */  public static String creatENCode() {    StringBuffer code = new StringBuffer();    Random random = new Random();    int s = random.nextInt(25) + 65;    code.append((char) s);    return code.toString();  }    /**   * 纯数字验证码   *    *   * @return   */  public static String creatNumberCode() {    StringBuffer code = new StringBuffer();    Random random = new Random();    return code.append(random.nextInt(9) + "").toString();  }    public BufferedImage getBuffImg() {    return buffImg;  }   public String getCode() {    return code;  }   public void setCode(String code) {    this.code = code;  }    public static void main(String[] args) {    String randomChineseChar = creatHan();    String randomEnChar = creatENCode();    System.out.println("args = [" + randomChineseChar + "]");    System.out.println("args = [" + randomEnChar + "]");  }}