ars.util.Opcodes Maven / Gradle / Ivy
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package ars.util;
import java.awt.Font;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.awt.geom.AffineTransform;
import java.util.Random;
/**
* 操作证码工具类
*
* @author wuyongqiang
*/
public final class Opcodes {
private static ThreadLocal threadRandom;
private Opcodes() {
}
/**
* 获取当前随机处理对象
*
* @return 随机处理对象
*/
private static Random getCurrentRandom() {
if (threadRandom == null) {
synchronized (Opcodes.class) {
if (threadRandom == null) {
threadRandom = new ThreadLocal();
Random random = new Random();
threadRandom.set(random);
return random;
}
}
}
Random random = threadRandom.get();
if (random == null) {
random = new Random();
threadRandom.set(random);
}
return random;
}
/**
* 移除当前随机处理对象
*/
private static void removeCurrentRandom() {
if (threadRandom != null) {
threadRandom.remove();
}
}
private static Color getRandomColor(int fc, int bc) {
if (fc > 255) {
fc = 255;
}
if (bc > 255) {
bc = 255;
}
Random random = getCurrentRandom();
int r = fc + random.nextInt(bc - fc);
int g = fc + random.nextInt(bc - fc);
int b = fc + random.nextInt(bc - fc);
return new Color(r, g, b);
}
private static void drawLine(Graphics graphics, int number, int width, int height) {
Random random = getCurrentRandom();
for (int i = 0; i < number; i++) {
int x = random.nextInt(width - 1);
int y = random.nextInt(height - 1);
int xl = random.nextInt(6) + 1;
int yl = random.nextInt(12) + 1;
graphics.drawLine(x, y, x + xl + 40, y + yl + 20);
}
}
private static void drawYawp(BufferedImage image, float rate, int width, int height) {
Random random = getCurrentRandom();
int area = (int) (rate * width * height);
for (int i = 0; i < area; i++) {
image.setRGB(random.nextInt(width), random.nextInt(height), getRandomIntColor());
}
}
private static int getRandomIntColor() {
int color = 0;
Random random = getCurrentRandom();
for (int i = 0; i < 3; i++) {
color = color << 8;
color = color | random.nextInt(255);
}
return color;
}
private static void shearX(Graphics graphics, Color color, int width, int height) {
Random random = getCurrentRandom();
int period = random.nextInt(2);
boolean borderGap = true;
int frames = 1;
int phase = random.nextInt(2);
for (int i = 0; i < height; i++) {
double d = (double) (period >> 1)
* Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
graphics.copyArea(0, i, width, 1, (int) d, 0);
if (borderGap) {
graphics.setColor(color);
graphics.drawLine((int) d, i, 0, i);
graphics.drawLine((int) d + width, i, width, i);
}
}
}
private static void shearY(Graphics graphics, Color color, int width, int height) {
Random random = getCurrentRandom();
int period = random.nextInt(40) + 10; // 50;
boolean borderGap = true;
int frames = 20;
int phase = 7;
for (int i = 0; i < width; i++) {
double d = (double) (period >> 1)
* Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
graphics.copyArea(i, 0, 1, height, 0, (int) d);
if (borderGap) {
graphics.setColor(color);
graphics.drawLine(i, (int) d, i, 0);
graphics.drawLine(i, (int) d + height, i, height);
}
}
}
/**
* 验证码编码
*
* @param content 验证码内容
* @return 图片对象
*/
public static BufferedImage encode(String content) {
return encode(content, 120, 50);
}
/**
* 验证码编码
*
* @param content 验证码内容
* @param width 图片宽度
* @param height 图片高度
* @return 图片对象
*/
public static BufferedImage encode(String content, int width, int height) {
if (content == null) {
throw new IllegalArgumentException("Content must not be null");
}
if (width < 1) {
throw new IllegalArgumentException("Width must not be less than 1, got " + width);
}
if (height < 1) {
throw new IllegalArgumentException("Height must not be less than 1, got " + height);
}
try {
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D graphics = image.createGraphics();
graphics.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
graphics.setColor(Color.GRAY);// 设置边框色
graphics.fillRect(0, 0, width, height);
graphics.setColor(getRandomColor(200, 250));// 设置背景色
graphics.fillRect(0, 2, width, height - 4);
Color color = getRandomColor(160, 200);
graphics.setColor(color);// 设置线条的颜色
drawLine(graphics, 20, width, height);// 绘制干扰线
drawYawp(image, 0.05f, width, height);// 添加噪点
shearX(graphics, color, width, height); // 扭曲横柱
shearY(graphics, color, width, height); // 扭曲纵柱
graphics.setColor(getRandomColor(100, 160));
int fontSize = height - 4;
graphics.setFont(new Font("Algerian", Font.ITALIC, fontSize));
Random random = getCurrentRandom();
char[] chars = content.toCharArray();
for (int i = 0; i < chars.length; i++) {
AffineTransform affine = new AffineTransform();
affine.setToRotation(Math.PI / 4 * random.nextDouble() * (random.nextBoolean() ? 1 : -1),
(width / chars.length) * i + fontSize / 2, height / 2);
graphics.setTransform(affine);
graphics.drawChars(chars, i, 1, ((width - 10) / chars.length) * i + 5, height / 2 + fontSize / 2 - 10);
}
graphics.dispose();
return image;
} finally {
removeCurrentRandom();
}
}
}
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