用javase写一个类实现自动生成验证码的功能，验证码随机自动生成；

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用java写一个类实现自动生成验证码的功能，验证码随机自动生成；

好了，直接上代码吧；//代码中有注释；有javase基础都可以看懂的；

package cn.mike.javase.vefification_code;import java.awt.Color;import java.awt.Font;import java.awt.Graphics2D;import java.awt.image.BufferedImage;import java.io.File;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;import java.io.OutputStream;import java.util.Random;import javax.imageio.ImageIO;import org.junit.Test;/** * @author : Administrator * @function : 这是用来测试随机生成验证码图片的类； */public class VerificationCode {/** * 单元测试，试一下能不能自动生成验证码图片 */@Testpublic void test_fun() {VerificationCode vc = new VerificationCode();BufferedImage image = vc.getImage();try {// 生成验证码图片，并保存到指定的路径VerificationCode.output(image, new FileOutputStream(new File(".\\image\\vcode_2.jpg")));} catch (FileNotFoundException e) {e.printStackTrace();}// 将随机生成的文本内容输出到控制台，用于校验System.out.println(vc.getText());}private int w = 70;// 宽private int h = 35;// 高private String text;// 文本内容(验证码字符串)private Random r = new Random();private String[] fontNames = { "宋体", "华文楷体", "黑体", "微软雅黑", "楷体_GB2312" };// 随机字符集合中不包括0和o，O，1和l，因为这些不易区分private String codes = "23456789abcdefghijkmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYXZ";// 验证码图片的背景色：白色private Color bgColor = new Color(255, 255, 255);/** * 返回一个验证码图片buffer对象：BufferedImage */public BufferedImage getImage() {BufferedImage image = createImage();// 获取绘图环境（画笔工具）Graphics2D g2 = (Graphics2D) image.getGraphics();// sb ： 用来保存验证码字符串文本内容StringBuilder sb = new StringBuilder();for (int i = 0; i < 4; ++i) {// 随机生成4个字符String s = randomChar() + "";sb.append(s);float x = i * 1.0F * w / 4;g2.setFont(randomFont());g2.setColor(randomColor());g2.drawString(s, x, h - 5);}this.text = sb.toString();// 记录验证码文本内容drawLine(image);// 画干扰线return image;}/** * @return 获取验证码文本内容 */public String getText() {return text;}/** * @param image * @param out *            将文本写到指定的输出流。比如本测试中FileOutputStream指定的保存路径 */public static void output(BufferedImage image, OutputStream out) {try {ImageIO.write(image, "jpeg", out);} catch (IOException e) {e.printStackTrace();}}private void drawLine(BufferedImage image) {Graphics2D g2 = (Graphics2D) image.getGraphics();for (int i = 0; i < 3; ++i) {// 画3条干扰线int x1 = r.nextInt(w);int y1 = r.nextInt(h);int x2 = r.nextInt(w);int y2 = r.nextInt(h);g2.setColor(Color.BLUE);g2.drawLine(x1, y1, x2, y2);}}private Color randomColor() {int red = r.nextInt(150);int green = r.nextInt(150);int blue = r.nextInt(150);return new Color(red, green, blue);}private Font randomFont() {int index = r.nextInt(fontNames.length);String fontName = fontNames[index];int style = r.nextInt(4);int size = r.nextInt(5) + 24;return new Font(fontName, style, size);}private char randomChar() {int index = r.nextInt(codes.length());return codes.charAt(index);}private BufferedImage createImage() {BufferedImage image = new BufferedImage(w, h,BufferedImage.TYPE_INT_RGB);Graphics2D g2 = (Graphics2D) image.getGraphics();g2.setColor(this.bgColor);g2.fillRect(0, 0, w, h);return image;}}

随机生成图片的效果图；

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