com.yuweix.kuafu.core.io.VcodeImgUtil Maven / Gradle / Ivy
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package com.yuweix.kuafu.core.io;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.imageio.stream.ImageOutputStream;
/**
* 生成验证码图片
* @author yuwei
*/
public abstract class VcodeImgUtil {
private static final String DEFAULT_IMAGE_TYPE = "jpg";
public static final byte[] createImage(String code) {
return createImage(code, DEFAULT_IMAGE_TYPE);
}
public static final byte[] createImage(String code, String imgType) {
RenderedImage image = createImage0(code);
ByteArrayOutputStream output = null;
ImageOutputStream imageOut = null;
try {
output = new ByteArrayOutputStream();
imageOut = ImageIO.createImageOutputStream(output);
ImageIO.write(image, imgType, imageOut);
return output.toByteArray();
} catch (IOException e) {
e.printStackTrace();
return null;
} finally {
if (imageOut != null) {
try {
imageOut.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (output != null) {
try {
output.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
private static RenderedImage createImage0(String code){
int width = 72;
int height = 20;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
Random random = new Random();
g.setColor(getRandColor(200, 250));
g.fillRect(0, 0, width, height);
g.setFont(new Font("Times New Roman", Font.PLAIN, 18));
g.setColor(getRandColor(160, 200));
for (int i = 0; i < 155; i++) {
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt(12);
int yl = random.nextInt(12);
g.drawLine(x, y, x + xl, y + yl);
}
for (int i = 0; i < code.length(); i++) {
g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
g.drawString(code.substring(i, i + 1), 13 * i + 6, 16);
}
g.dispose();
return image;
}
private static Color getRandColor(int fc, int bc) {
Random random = new Random();
int fc0 = fc;
if (fc0 > 255) {
fc0 = 255;
}
int bc0 = bc;
if (bc0 > 255) {
bc0 = 255;
}
int r = fc0 + random.nextInt(bc0 - fc0);
int g = fc0 + random.nextInt(bc0 - fc0);
int b = fc0 + random.nextInt(bc0 - fc0);
return new Color(r, g, b);
}
}