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增加简单算术类型验证码类
算术类型验证码可以设置难度、运算方法
This commit is contained in:
lihaoran 2020-03-26 15:59:25 +08:00
parent da3501451b
commit 8f933b5739
4 changed files with 184 additions and 3 deletions
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4
README.md
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@ -229,8 +229,10 @@ public class Test {
captcha.setLen(3); // 几位数运算，默认是两位
captcha.getArithmeticString(); // 获取运算的公式：3+2=?
captcha.text(); // 获取运算的结果：5
captcha.supportAlgorithmSign(2); // 可设置支持的算法：2 表示只生成带加减法的公式
captcha.setDifficulty(50); // 设置计算难度，参与计算的每一个整数的最大值
captcha.out(outputStream); // 输出验证码
//简单算术类型 SimpleArithmeticCaptcha,用法同ArithmeticCaptcha,只支持加减，计算结果为正整数
}
}
```

160
src/main/java/com/wf/captcha/SimpleArithmeticCaptcha.java Normal file
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@ -0,0 +1,160 @@
package com.wf.captcha;
import com.wf.captcha.base.ArithmeticCaptchaAbstract;
import javax.imageio.ImageIO;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
/**
* Description：最后一位计算时保证结果为正，避免负号输入
* 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
*
* @author Li Haoran
*/
public class SimpleArithmeticCaptcha extends ArithmeticCaptchaAbstract {
public SimpleArithmeticCaptcha() {
}
public SimpleArithmeticCaptcha(int width, int height) {
this();
setWidth(width);
setHeight(height);
}
public SimpleArithmeticCaptcha(int width, int height, int len) {
this(width, height);
setLen(len);
}
public SimpleArithmeticCaptcha(int width, int height, int len, Font font) {
this(width, height, len);
setFont(font);
}
public SimpleArithmeticCaptcha(int width, int height, int len, int font) throws IOException, FontFormatException {
this(width, height, len);
setFont(font,32f);
}
/**
* 生成验证码
*
* @param out 输出流
* @return 是否成功
*/
@Override
public boolean out(OutputStream out) {
checkAlpha();
return graphicsImage(getArithmeticString().toCharArray(), out);
}
@Override
public String toBase64() {
return toBase64("data:image/png;base64,");
}
/**
* 生成验证码图形
*
* @param strs 验证码
* @param out 输出流
* @return boolean
*/
private boolean graphicsImage(char[] strs, OutputStream out) {
try {
BufferedImage bi = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D g2d = (Graphics2D) bi.getGraphics();
// 填充背景
g2d.setColor(Color.WHITE);
g2d.fillRect(0, 0, width, height);
// 抗锯齿
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
// 画干扰圆
drawOval(2, g2d);
// 画字符串
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 - (int) fontMetrics.getStringBounds("8", g2d).getWidth()) / 2; // 字符的左右边距
for (int i = 0; i < strs.length; i++) {
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;
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return false;
}
/**
* 生成随机验证码
* 不包含乘法、没有负数
* @return 验证码字符数组
*/
@Override
protected char[] alphas() {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < len-1; i++) {
sb.append(num(difficulty));
if (i < len - 1) {
int type = num(1, 3);
if (type == 1) {
sb.append("+");
} else if (type == 2) {
sb.append("-");
}
}
}
ScriptEngineManager manager = new ScriptEngineManager();
ScriptEngine engine = manager.getEngineByName("javascript");
try {
chars = String.valueOf(engine.eval(sb.toString()));
} catch (ScriptException e) {
e.printStackTrace();
}
int parseInt = Integer.parseInt(chars);
if(parseInt<0){
sb.append("+");
sb.append(num(-parseInt,-parseInt+11));
}else {
int type = num(1, 3);
if (type == 1) {
sb.append("+");
sb.append(num(difficulty));
} else if (type == 2) {
sb.append("-");
sb.append(num(0,parseInt+1));
}
}
try {
chars = String.valueOf(engine.eval(sb.toString()));
} catch (ScriptException e) {
e.printStackTrace();
}
sb.append("=?");
setArithmeticString(sb.toString());
return chars.toCharArray();
}
}

21
src/main/java/com/wf/captcha/base/ArithmeticCaptchaAbstract.java
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@ -11,6 +11,9 @@ import javax.script.ScriptException;
public abstract class ArithmeticCaptchaAbstract extends Captcha {
private String arithmeticString; // 计算公式
protected static int difficulty = 10;
protected static int algorithmSign = 4;
public ArithmeticCaptchaAbstract() {
setLen(2);
}
@ -24,9 +27,9 @@ public abstract class ArithmeticCaptchaAbstract extends Captcha {
protected char[] alphas() {
StringBuilder sb = new StringBuilder();
for (int i = 0; i < len; i++) {
sb.append(num(10));
sb.append(num(difficulty));
if (i < len - 1) {
int type = num(1, 4);
int type = num(1, algorithmSign);
if (type == 1) {
sb.append("+");
} else if (type == 2) {
@ -56,4 +59,18 @@ public abstract class ArithmeticCaptchaAbstract extends Captcha {
public void setArithmeticString(String arithmeticString) {
this.arithmeticString = arithmeticString;
}
public void setDifficulty(int difficulty) {
this.difficulty = difficulty;
}
/**
* algorithmSign 2 : 支持加法
* algorithmSign 3 : 支持加减法
* algorithmSign 4 : 支持加减乘法
* @param algorithmSign 计算公式标示
*/
public void supportAlgorithmSign(int algorithmSign){
this.algorithmSign = algorithmSign;
}
}

2
src/test/java/com/wf/captcha/CaptchaTest.java
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@ -56,6 +56,8 @@ public class CaptchaTest {
/*for (int i = 0; i < 10; i++) {
ArithmeticCaptcha specCaptcha = new ArithmeticCaptcha();
specCaptcha.setLen(3);
specCaptcha.supportAlgorithmSign(2);
specCaptcha.setDifficulty(50);
specCaptcha.setFont(i, 28f);
System.out.println(specCaptcha.getArithmeticString() + " " + specCaptcha.text());
specCaptcha.out(new FileOutputStream(new File("C:/Java/aa" + i + ".png")));