161 lines
4.8 KiB
Java
161 lines
4.8 KiB
Java
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package com.wf.captcha;
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import com.wf.captcha.base.ArithmeticCaptchaAbstract;
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import javax.imageio.ImageIO;
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import javax.script.ScriptEngine;
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import javax.script.ScriptEngineManager;
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import javax.script.ScriptException;
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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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/**
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* Description:最后一位计算时保证结果为正,避免负号输入
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* 2位3位整数计算比较好,否则最后一位会数字会有点异常
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*
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* @author Li Haoran
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*/
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public class SimpleArithmeticCaptcha extends ArithmeticCaptchaAbstract {
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public SimpleArithmeticCaptcha() {
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}
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public SimpleArithmeticCaptcha(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 SimpleArithmeticCaptcha(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 SimpleArithmeticCaptcha(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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public SimpleArithmeticCaptcha(int width, int height, int len, int font) throws IOException, FontFormatException {
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this(width, height, len);
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setFont(font,32f);
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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(getArithmeticString().toCharArray(), 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("8", 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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/**
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* 生成随机验证码
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* 不包含乘法、没有负数
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* @return 验证码字符数组
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*/
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@Override
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protected char[] alphas() {
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StringBuilder sb = new StringBuilder();
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for (int i = 0; i < len-1; i++) {
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sb.append(num(difficulty));
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if (i < len - 1) {
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int type = num(1, 3);
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if (type == 1) {
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sb.append("+");
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} else if (type == 2) {
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sb.append("-");
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}
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}
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}
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ScriptEngineManager manager = new ScriptEngineManager();
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ScriptEngine engine = manager.getEngineByName("javascript");
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try {
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chars = String.valueOf(engine.eval(sb.toString()));
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} catch (ScriptException e) {
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e.printStackTrace();
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}
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int parseInt = Integer.parseInt(chars);
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if(parseInt<0){
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sb.append("+");
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sb.append(num(-parseInt,-parseInt+11));
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}else {
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int type = num(1, 3);
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if (type == 1) {
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sb.append("+");
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sb.append(num(difficulty));
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} else if (type == 2) {
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sb.append("-");
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sb.append(num(0,parseInt+1));
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}
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}
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try {
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chars = String.valueOf(engine.eval(sb.toString()));
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} catch (ScriptException e) {
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e.printStackTrace();
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}
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sb.append("=?");
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setArithmeticString(sb.toString());
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return chars.toCharArray();
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}
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}
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