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package cn.wisenergy.chnmuseum.party.common.checkcode;
import java.awt.*;
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 = 4; // 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 String out(OutputStream os);
/**
* 获取随机字符串
*
* @return string
*/
public String text() {
return chars;
}
}