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src/main/java/com/wf/captcha/Captcha.java

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+package com.wf.captcha;
+
+import java.awt.Color;
+import java.awt.Font;
+import java.io.OutputStream;
+
+/**
+ * <p>
+ * 验证码抽象类,暂时不支持中文
+ * </p>
+ * 
+ * @author: wuhongjun
+ * @version:1.0
+ */
+public abstract class Captcha extends Randoms {
+	protected Font font = new Font("Verdana", Font.ITALIC | Font.BOLD, 28); // 字体
+	protected int len = 5; // 验证码随机字符长度
+	protected int width = 150; // 验证码显示跨度
+	protected int height = 40; // 验证码显示高度
+	private String chars = null; // 随机字符串
+
+	/**
+	 * 生成随机字符数组
+	 * 
+	 * @return 字符数组
+	 */
+	protected char[] alphas() {
+		char[] cs = new char[len];
+		for (int i = 0; i < len; i++) {
+			cs[i] = alpha();
+		}
+		chars = new String(cs);
+		return cs;
+	}
+
+	public Font getFont() {
+		return font;
+	}
+
+	public void setFont(Font font) {
+		this.font = font;
+	}
+
+	public int getLen() {
+		return len;
+	}
+
+	public void setLen(int len) {
+		this.len = len;
+	}
+
+	public int getWidth() {
+		return width;
+	}
+
+	public void setWidth(int width) {
+		this.width = width;
+	}
+
+	public int getHeight() {
+		return height;
+	}
+
+	public void setHeight(int height) {
+		this.height = height;
+	}
+
+	/**
+	 * 给定范围获得随机颜色
+	 * 
+	 * @return Color 随机颜色
+	 */
+	protected Color color(int fc, int bc) {
+		if (fc > 255)
+			fc = 255;
+		if (bc > 255)
+			bc = 255;
+		int r = fc + num(bc - fc);
+		int g = fc + num(bc - fc);
+		int b = fc + num(bc - fc);
+		return new Color(r, g, b);
+	}
+
+	/**
+	 * 验证码输出,抽象方法，由子类实现
+	 * 
+	 * @param os
+	 *            输出流
+	 */
+	public abstract void out(OutputStream os);
+
+	/**
+	 * 获取随机字符串
+	 * 
+	 * @return string
+	 */
+	public String text() {
+		return chars;
+	}
+	
+	public char[] textChar() {
+		return chars.toCharArray();
+	}
+}