115 lines
3.5 KiB
Java
115 lines
3.5 KiB
Java
package com.wf.captcha;
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import java.awt.*;
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import java.awt.image.BufferedImage;
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import java.io.IOException;
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import java.io.OutputStream;
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public class ChineseGifCaptcha extends ChineseCaptchaAbstract {
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public ChineseGifCaptcha() {
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}
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public ChineseGifCaptcha(int width, int height) {
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setWidth(width);
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setHeight(height);
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}
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public ChineseGifCaptcha(int width, int height, int len) {
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this(width, height);
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setLen(len);
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}
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public ChineseGifCaptcha(int width, int height, int len, Font font) {
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this(width, height, len);
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setFont(font);
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}
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@Override
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public boolean out(OutputStream os) {
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checkAlpha();
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boolean ok = false;
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try {
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char[] rands = textChar(); // 获取验证码数组
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GifEncoder gifEncoder = new GifEncoder();
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gifEncoder.start(os);
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gifEncoder.setQuality(180);
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gifEncoder.setDelay(100);
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gifEncoder.setRepeat(0);
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BufferedImage frame;
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Color fontcolor = color();
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for (int i = 0; i < len; i++) {
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frame = graphicsImage(fontcolor, rands, i);
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gifEncoder.addFrame(frame);
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frame.flush();
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}
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gifEncoder.finish();
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ok = true;
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} finally {
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try {
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os.close();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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return ok;
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}
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/**
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* 画随机码图
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*
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* @param fontcolor 随机字体颜色
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* @param strs 字符数组
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* @param flag 透明度使用
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* @return BufferedImage
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*/
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private BufferedImage graphicsImage(Color fontcolor, char[] strs, int flag) {
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BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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Graphics2D g2d = (Graphics2D) image.getGraphics();
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g2d.setColor(Color.WHITE); // 填充背景颜色
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g2d.fillRect(0, 0, width, height);
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AlphaComposite ac3;
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int h = height - ((height - font.getSize()) >> 1);
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int w = width / len;
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g2d.setFont(font);
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g2d.setColor(fontcolor);
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// 抗锯齿
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g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
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// 画验证码
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for (int i = 0; i < len; i++) {
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ac3 = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, getAlpha(flag, i));
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g2d.setComposite(ac3);
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int x = i * w + num(2, 6);
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g2d.drawString(String.valueOf(strs[i]), x, h - num(2, 6));
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}
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// 随机画干扰线
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g2d.setStroke(new BasicStroke(1.2f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
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for (int i = 0; i < 5; i++) {
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ac3 = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.65f);
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g2d.setComposite(ac3);
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int x1 = num(-10, width - 10);
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int y1 = num(5, height - 5);
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int x2 = num(10, width + 10);
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int y2 = num(2, height - 2);
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g2d.drawLine(x1, y1, x2, y2);
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// 画干扰圆圈
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g2d.drawOval(num(width), num(height), 5 + num(10), 5 + num(10));
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}
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g2d.dispose();
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return image;
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}
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/**
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* 获取透明度,从0到1,自动计算步长
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*
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* @param i
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* @param j
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* @return 透明度
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*/
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private float getAlpha(int i, int j) {
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int num = i + j;
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float r = (float) 1 / len, s = (len + 1) * r;
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return num > len ? (num * r - s) : num * r;
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}
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}
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