110 lines
3.2 KiB
Java
110 lines
3.2 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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import javax.imageio.ImageIO;
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/**
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* png格式验证码
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* Created by 王帆 on 2018-07-27 上午 10:08.
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*/
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public class SpecCaptcha extends Captcha {
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public SpecCaptcha() {
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}
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public SpecCaptcha(int width, int height) {
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this();
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setWidth(width);
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setHeight(height);
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}
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public SpecCaptcha(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 SpecCaptcha(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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/**
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* 生成验证码
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*
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* @param out 输出流
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* @return 是否成功
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*/
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@Override
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public boolean out(OutputStream out) {
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checkAlpha();
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return graphicsImage(textChar(), out);
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}
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/**
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* 生成验证码图形
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*
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* @param strs 验证码
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* @param out 输出流
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* @return boolean
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*/
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private boolean graphicsImage(char[] strs, OutputStream out) {
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boolean ok;
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try {
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BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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Graphics2D g = (Graphics2D) bi.getGraphics();
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g.setColor(Color.WHITE);
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g.fillRect(0, 0, width, height);
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// 抗锯齿
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g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
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g.setStroke(new BasicStroke(1.3f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
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// 随机画干扰线
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drawLine(3, g);
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// 随机画干扰圆
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drawOval(8, g);
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// 画字符串
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AlphaComposite ac3 = AlphaComposite.getInstance(AlphaComposite.SRC_OVER, 0.8f);// 指定透明度
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g.setComposite(ac3);
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int hp = (height - font.getSize()) >> 1;
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int h = height - hp;
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int w = width / strs.length;
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int sp = (w - font.getSize()) / 2;
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for (int i = 0; i < strs.length; i++) {
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g.setColor(new Color(20 + num(110), 20 + num(110), 20 + num(110)));
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// 计算坐标
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int x = i * w + sp + num(3);
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int y = h - num(3, 6);
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if (x < 8) {
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x = 8;
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}
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if (x + font.getSize() > width) {
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x = width - font.getSize();
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}
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if (y > height) {
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y = height;
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}
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if (y - font.getSize() < 0) {
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y = font.getSize();
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}
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g.setFont(font.deriveFont(num(2) == 0 ? Font.PLAIN : Font.ITALIC));
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g.drawString(String.valueOf(strs[i]), x, y);
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}
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ImageIO.write(bi, "png", out);
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out.flush();
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ok = true;
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} catch (IOException e) {
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ok = false;
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e.printStackTrace();
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} finally {
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try {
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out.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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} |