java 生成验证码程序

package esri;import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.File;import java.io.IOException;import java.util.Random;import javax.imageio.ImageIO;//javax.imageio/** *  * @author rjgcx * @version 1.0 * <p>this class use to generate the image that contains the validate code</p> */public class ImageValidate {private static final int WIDTH = 130;private static final int HEIGHT = 40;public static void main(String[] args) throws IOException {BufferedImage image = new BufferedImage(WIDTH, HEIGHT,BufferedImage.TYPE_INT_RGB);Graphics2D g2 = (Graphics2D) image.createGraphics();g2.setColor(Color.white);g2.fillRect(0, 0, WIDTH, HEIGHT);g2.setColor(Color.black);// generate ten [a-z]g2.setFont(new Font("DialogInput", Font.BOLD, 20));int[] drawLetter = new int[10];Random rand = new Random();for (int i = 0; i < 5; i++) {drawLetter[i] = 65 + rand.nextInt(24);g2.drawString(String.valueOf((char)drawLetter[i]),10 * i,15 + rand.nextInt(5));}g2.setFont(new Font("DialogInput", Font.PLAIN, 20));for (int i = 0; i < 5; i++) {drawLetter[i] = 65 + rand.nextInt(24);g2.drawString(String.valueOf((char)drawLetter[i]),80 + 10 * i,35);}//draw the linesg2.dispose();//write the image to the disk.ImageIO.write(image, "png", new File("validate.PNG"));}}

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