2019独角兽企业重金招聘Python工程师标准>>> 
package photo;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.util.Random;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
public class ImageCodeAction {
private InputStream input;
private static int WIDTH = 300;
private static int HEIGHT = 100;
private static int NUM = 4;
private static char[] seq = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I',
'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V',
'W', 'X', 'Y', 'Z', '0', '1', '2', '3', '4', '5', '6', '7', '8',
'9' };
public String execute() {
byte[] image = randomImage();
input = new ByteArrayInputStream(image);
return "success";
}
/**
*
* @return
*/
private byte[] randomImage() {
Random r = new Random();
// 图片的内存映像
BufferedImage image = new BufferedImage(WIDTH, HEIGHT,
BufferedImage.TYPE_INT_RGB);
// 获得画笔对象
Graphics g = image.getGraphics();
g.setColor(randomColor(r));
g.fillRect(0, 0, WIDTH, HEIGHT);
g.setColor(new Color(0, 0, 0));
// 用于存储随机生成的验证码
StringBuffer number = new StringBuffer();
// 绘制验证码
for (int i = 0; i < NUM; i++) {
g.setColor(randomColor(r));
int h = (int) ((HEIGHT * 60 / 100) * r.nextDouble() + (HEIGHT * 30 / 100));
g.setFont(new Font(null, Font.BOLD | Font.ITALIC, h));
String ch = String.valueOf(seq[r.nextInt(seq.length)]);
number.append(ch);
g.drawString(ch, i * WIDTH / NUM * 90 / 100, h);
}
session.put("code", number.toString());
System.out.println(number.toString());
// 绘制干扰线
for (int i = 0; i <= 12; i++) {
g.setColor(randomColor(r));
g.drawLine(r.nextInt(WIDTH), r.nextInt(HEIGHT), r.nextInt(WIDTH), r
.nextInt(HEIGHT));
}
ByteArrayOutputStream os = new ByteArrayOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(os);
// 把BufferedImage对象中的图像信息编码后
// 向创建该对象(encoder)时指定的输出流输出
try {
encoder.encode(image);
return os.toByteArray();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private Color randomColor(Random r) {
return new Color(r.nextInt(255), r.nextInt(255), r.nextInt(255));
}
public InputStream getInput() {
return input;
}
public void setInput(InputStream input) {
this.input = input;
}
}