本文共 3770 字，大约阅读时间需要 12 分钟。

代码如下：

package com.Kit.yan;import javax.imageio.ImageIO;import java.awt.*;import java.awt.image.BufferedImage;import java.io.IOException;import java.io.OutputStream;import java.util.Random;public class VerifyCode {
       private int w = 70;    private int h = 35;    private Random r = new Random();    // {"宋体", "华文楷体", "黑体", "华文新魏", "华文隶书", "微软雅黑", "楷体_GB2312"}    private String[] fontNames =            {
    "宋体", "华文楷体", "黑体", "微软雅黑", "楷体_GB2312" };    // 可选字符    private String codes = "23456789abcdefghjkmnopqrstuvwxyzABCDEFGHJKMNPQRSTUVWXYZ";    // 背景色    private Color bgColor = new Color(255, 255, 255);    // 验证码上的文本    private String text;    // 生成随机的颜色    private Color randomColor() {
           int red = r.nextInt(150);        int green = r.nextInt(150);        int blue = r.nextInt(150);        return new Color(red, green, blue);    }    // 生成随机的字体    private Font randomFont() {
           int index = r.nextInt(fontNames.length);        String fontName = fontNames[index];// 生成随机的字体名称        int style = r.nextInt(4);// 生成随机的样式, 0(无样式), 1(粗体), 2(斜体), 3(粗体+斜体)        int size = r.nextInt(5) + 24; // 生成随机字号, 24 ~ 28        return new Font(fontName, style, size);    }    // 画干扰线    private void drawLine(BufferedImage image) {
           int num = 3;// 一共画3条        Graphics2D g2 = (Graphics2D) image.getGraphics();        for (int i = 0; i < num; i++) {
   // 生成两个点的坐标，即4个值            int x1 = r.nextInt(w);            int y1 = r.nextInt(h);            int x2 = r.nextInt(w);            int y2 = r.nextInt(h);            g2.setStroke(new BasicStroke(1.5F));            g2.setColor(Color.BLUE); // 干扰线是蓝色            g2.drawLine(x1, y1, x2, y2);// 画线        }    }    // 随机生成一个字符    private char randomChar() {
           int index = r.nextInt(codes.length());        return codes.charAt(index);    }    // 创建BufferedImage    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;    }    // ！调用这个方法得到验证码    public BufferedImage getImage() {
           BufferedImage image = createImage();// 创建图片缓冲区        Graphics2D g2 = (Graphics2D) image.getGraphics();// 得到绘制环境        StringBuilder sb = new StringBuilder();// 用来装载生成的验证码文本        // 向图片中画4个字符        for (int i = 0; i < 4; i++) {
   // 循环四次，每次生成一个字符            String s = randomChar() + "";// 随机生成一个字母            sb.append(s); // 把字母添加到sb中            float x = i * 1.0F * w / 4; // 设置当前字符的x轴坐标            g2.setFont(randomFont()); // 设置随机字体            g2.setColor(randomColor()); // 设置随机颜色            g2.drawString(s, x, h - 5); // 画图        }        this.text = sb.toString(); // 把生成的字符串赋给了this.text        drawLine(image); // 添加干扰线        return image;    }    // 返回验证码图片上的文本    public String getText() {
           return text;    }    // 保存图片到指定的输出流    public static void output(BufferedImage image, OutputStream out)            throws IOException {
           ImageIO.write(image, "JPEG", out);    }}

测试函数：

import com.Kit.yan.VerifyCode;import javax.imageio.ImageIO;import java.awt.*;import java.awt.image.BufferedImage;import java.io.*;import java.util.ArrayList;import java.util.List;import java.util.Queue;public class Test {
       public static void main(String[] args) throws IOException {
           fun1();    }    public static void fun1() throws FileNotFoundException, IOException {
           VerifyCode verifyCode = new VerifyCode();        //这里就会把test生成在默认的当前路径下，而命令行这边就是输入的是text文字        verifyCode.output(verifyCode.getImage(), new FileOutputStream("test.jpg"));        String str = verifyCode.getText();        System.out.println(str);    }}

参考自：

转载地址：http://gifen.baihongyu.com/