99 lines
2.8 KiB
Java
99 lines
2.8 KiB
Java
package com.wf.captcha;
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import com.wf.captcha.base.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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return graphicsImage(textChar(), out);
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}
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@Override
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public String toBase64() {
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return toBase64("data:image/png;base64,");
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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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try {
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BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
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Graphics2D g2d = (Graphics2D) bi.getGraphics();
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// 填充背景
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g2d.setColor(Color.WHITE);
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g2d.fillRect(0, 0, width, height);
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// 抗锯齿
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g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
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// 画干扰圆
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drawOval(2, g2d);
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// 画干扰线
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g2d.setStroke(new BasicStroke(2f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
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drawBesselLine(1, g2d);
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// 画字符串
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g2d.setFont(getFont());
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FontMetrics fontMetrics = g2d.getFontMetrics();
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int fW = width / strs.length; // 每一个字符所占的宽度
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int fSp = (fW - (int) fontMetrics.getStringBounds("W", g2d).getWidth()) / 2; // 字符的左右边距
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for (int i = 0; i < strs.length; i++) {
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g2d.setColor(color());
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int fY = height - ((height - (int) fontMetrics.getStringBounds(String.valueOf(strs[i]), g2d).getHeight()) >> 1); // 文字的纵坐标
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g2d.drawString(String.valueOf(strs[i]), i * fW + fSp + 3, fY - 3);
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}
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g2d.dispose();
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ImageIO.write(bi, "png", out);
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out.flush();
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return true;
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} catch (IOException e) {
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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 false;
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}
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} |