package com.cdms.common.utils;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.security.SecureRandom;
import java.util.Arrays;
import java.util.Random;
import javax.imageio.ImageIO;
/**
* 验证码工具类
*
* @author yanwg
*/
public class VerifyCodeUtils
{
// 使用到Algerian字体，系统里没有的话需要安装字体，字体只显示大写，去掉了1,0,i,o几个容易混淆的字符
public static final StringVERIFY_CODES ="123456789ABCDEFGHJKLMNPQRSTUVWXYZ";
private static Randomrandom =new SecureRandom();
/**
* 使用系统默认字符源生成验证码
*
* @param verifySize 验证码长度
* @return
*/
public static StringgenerateVerifyCode(int verifySize)
{
return generateVerifyCode(verifySize, VERIFY_CODES);
}
/**
* 使用指定源生成验证码
*
* @param verifySize 验证码长度
* @param sources 验证码字符源
* @return
*/
public static StringgenerateVerifyCode(int verifySize, String sources)
{
if (sources ==null || sources.length() ==0)
{
sources =VERIFY_CODES;
}
int codesLen = sources.length();
Random rand =new Random(System.currentTimeMillis());
StringBuilder verifyCode =new StringBuilder(verifySize);
for (int i =0; i < verifySize; i++)
{
verifyCode.append(sources.charAt(rand.nextInt(codesLen -1)));
}
return verifyCode.toString();
}
/**
* 输出指定验证码图片流
*
* @param w
* @param h
* @param os
* @param code
* @throws IOException
*/
public static void outputImage(int w, int h, OutputStream os, String code)throws IOException
{
int verifySize = code.length();
BufferedImage image =new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Random rand =new Random();
Graphics2D g2 = image.createGraphics();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
Color[] colors =new Color[5];
Color[] colorSpaces =new Color[] { Color.WHITE, Color.CYAN, Color.GRAY, Color.LIGHT_GRAY, Color.MAGENTA,
Color.ORANGE, Color.PINK, Color.YELLOW };
float[] fractions =new float[colors.length];
for (int i =0; i < colors.length; i++)
{
colors[i] = colorSpaces[rand.nextInt(colorSpaces.length)];
fractions[i] = rand.nextFloat();
}
Arrays.sort(fractions);
g2.setColor(Color.GRAY);// 设置边框色
g2.fillRect(0, 0, w, h);
Color c =getRandColor(200, 250);
g2.setColor(c);// 设置背景色
g2.fillRect(0, 2, w, h -4);
// 绘制干扰线
Random random =new Random();
g2.setColor(getRandColor(160, 200));// 设置线条的颜色
for (int i =0; i <20; i++)
{
int x = random.nextInt(w -1);
int y = random.nextInt(h -1);
int xl = random.nextInt(6) +1;
int yl = random.nextInt(12) +1;
g2.drawLine(x, y, x + xl +40, y + yl +20);
}
// 添加噪点
float yawpRate =0.05f;// 噪声率
int area = (int) (yawpRate * w * h);
for (int i =0; i < area; i++)
{
int x = random.nextInt(w);
int y = random.nextInt(h);
int rgb =getRandomIntColor();
image.setRGB(x, y, rgb);
}
shear(g2, w, h, c);// 使图片扭曲
g2.setColor(getRandColor(100, 160));
int fontSize = h -4;
Font font =new Font("Algerian", Font.ITALIC, fontSize);
g2.setFont(font);
char[] chars = code.toCharArray();
for (int i =0; i < verifySize; i++)
{
AffineTransform affine =new AffineTransform();
affine.setToRotation(Math.PI /4 * rand.nextDouble() * (rand.nextBoolean() ?1 : -1),
(w / verifySize) * i + fontSize /2, h /2);
g2.setTransform(affine);
g2.drawChars(chars, i, 1, ((w -10) / verifySize) * i +5, h /2 + fontSize /2 -10);
}
g2.dispose();
ImageIO.write(image, "jpg", os);
}
private static ColorgetRandColor(int fc, int bc)
{
if (fc >255) {
fc =255;
}
if (bc >255) {
bc =255;
}
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 int getRandomIntColor()
{
int[] rgb =getRandomRgb();
int color =0;
for (int c : rgb)
{
color = color <<8;
color = color | c;
}
return color;
}
private static int[]getRandomRgb()
{
int[] rgb =new int[3];
for (int i =0; i <3; i++)
{
rgb[i] =random.nextInt(255);
}
return rgb;
}
private static void shear(Graphics g, int w1, int h1, Color color)
{
shearX(g, w1, h1, color);
shearY(g, w1, h1, color);
}
private static void shearX(Graphics g, int w1, int h1, Color color)
{
int period =random.nextInt(2);
boolean borderGap =true;
int frames =1;
int phase =random.nextInt(2);
for (int i =0; i < h1; i++)
{
double d = (double) (period >>1)
* Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
g.copyArea(0, i, w1, 1, (int) d, 0);
if (borderGap)
{
g.setColor(color);
g.drawLine((int) d, i, 0, i);
g.drawLine((int) d + w1, i, w1, i);
}
}
}
private static void shearY(Graphics g, int w1, int h1, Color color)
{
int period =random.nextInt(40) +10; // 50;
boolean borderGap =true;
int frames =20;
int phase =7;
for (int i =0; i < w1; i++)
{
double d = (double) (period >>1)
* Math.sin((double) i / (double) period + (6.2831853071795862D * (double) phase) / (double) frames);
g.copyArea(i, 0, 1, h1, 0, (int) d);
if (borderGap)
{
g.setColor(color);
g.drawLine(i, (int) d, i, 0);
g.drawLine(i, (int) d + h1, i, h1);
}
}
}
}
