代码还有改进的地方,如生成每个字符串的字体,样式,颜色等,此处只做简单的生成。
package image;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Random;
import javax.imageio.ImageIO;
public class DrawImage {
public static void main(String[] args) throws FileNotFoundException, IOException {
// 得到图片缓冲区
BufferedImage bufferedImage = new BufferedImage(100, 50, BufferedImage.TYPE_3BYTE_BGR);
// 得到它的绘制环境(画笔)
Graphics2D graphics2d = (Graphics2D) bufferedImage.getGraphics();
// 设置颜色
graphics2d.setColor(Color.white);
// 填充区域
graphics2d.fillRect(0, 0, 100, 50);
// 设置颜色
graphics2d.setColor(Color.black);
// 设置字体样式
graphics2d.setFont(new Font(Font.SANS_SERIF, Font.BOLD, 30));
//设置边框
graphics2d.drawRect(0, 0, 99, 49);
// 获取随机生成String内容并在图片上画上字符串
graphics2d.drawString(getCheckNum(), 10, 30);
// 设置保存路径
ImageIO.write(bufferedImage, "JPEG", new FileOutputStream("C:\\Users\\lenovo\\Desktop\\check.jpg"));
}
private static String getCheckNum() {
// TODO 自动生成的方法存根
char[] ch = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o',
'p', 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', 'z', 'x', 'c', 'v', 'b', 'n', 'm' };
char[] newC = new char[4];
for (int i = 0; i < 4; i++) {
Random r = new Random();
int randomInt = r.nextInt(ch.length);
newC[i] = ch[randomInt];
}
String s = String.valueOf(newC);
return s;
}
}