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增加内置字体、贝塞尔曲线、算术验证码、base64输出

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This commit is contained in:
whvcse@foxmail.com
2019-08-23 23:50:26 +08:00
parent 366f54ea80
commit 8ebe5918c9
12 changed files with 640 additions and 527 deletions
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54
src/main/java/com/wf/captcha/SpecCaptcha.java
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@@ -45,6 +45,11 @@ public class SpecCaptcha extends Captcha {
return graphicsImage(textChar(), out);
}
@Override
public String toBase64() {
return toBase64("data:image/png;base64,");
}
/**
* 生成验证码图形
*
@@ -55,45 +60,28 @@ public class SpecCaptcha extends Captcha {
private boolean graphicsImage(char[] strs, OutputStream out) {
try {
BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g = (Graphics2D) bi.getGraphics();
Graphics2D g2d = (Graphics2D) bi.getGraphics();
// 填充背景
g.setColor(Color.WHITE);
g.fillRect(0, 0, width, height);
g2d.setColor(Color.WHITE);
g2d.fillRect(0, 0, width, height);
// 抗锯齿
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g.setStroke(new BasicStroke(1.3f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
// 随机画干扰线
// drawLine(3, g);
// 随机画干扰圆
// drawOval(8, g);
drawBesselLine(2, g);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
// 画干扰圆
drawOval(2, g2d);
// 画干扰线
g2d.setStroke(new BasicStroke(2f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
drawBesselLine(1, g2d);
// 画字符串
// AlphaComposite ac3 = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.8f);// 指定透明度
// g.setComposite(ac3);
g.setFont(getFont());
int fontSize = getFont().getSize();
int fY = height - ((height - fontSize) >> 1); // 文字的纵坐标
g2d.setFont(getFont());
FontMetrics fontMetrics = g2d.getFontMetrics();
int fW = width / strs.length; // 每一个字符所占的宽度
int fSp = (fW - fontSize) / 2; // 字符的左右边距
int fSp = (fW - (int) fontMetrics.getStringBounds("W", g2d).getWidth()) / 2; // 字符的左右边距
for (int i = 0; i < strs.length; i++) {
g.setColor(color());
// 计算坐标
int x = i * fW + fSp;
int y = fY/* - num(3, 6)*/;
/*if (x < 8) {
x = 8;
}
if (x + fontSize > width) {
x = width - fontSize;
}*/
/*if (y > height) {
y = height;
}
if (y - fontSize < 0) {
y = fontSize;
}*/
g.drawString(String.valueOf(strs[i]), x, y);
g2d.setColor(color());
int fY = height - ((height - (int) fontMetrics.getStringBounds(String.valueOf(strs[i]), g2d).getHeight()) >> 1); // 文字的纵坐标
g2d.drawString(String.valueOf(strs[i]), i * fW + fSp + 3, fY - 3);
}
g2d.dispose();
ImageIO.write(bi, "png", out);
out.flush();
return true;