116 lines
3.0 KiB
Java
116 lines
3.0 KiB
Java
package com.xwbing.util.captcha;
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import javax.imageio.ImageIO;
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import java.awt.*;
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import java.awt.image.BufferedImage;
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import java.io.File;
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import java.io.FileOutputStream;
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import java.util.Random;
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/**
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* 说明:验证码工具类
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* 作者: xiangwb
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*/
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public class CaptchaUtil {
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// 随机产生的字符串
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private static final String RANDOM_STRS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
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private static final String FONT_NAME = "Fixedsys";
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private Random random = new Random();
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private static final int FONT_SIZE = 18;// 字体大小
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private static final int WIDTH = 80;// 图片宽
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private static final int HEIGHT = 25;// 图片高
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private static final int LINE_NUM = 50;// 干扰线数量
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private static final int STR_NUM = 4;// 随机产生字符数量
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/**
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* 生成随机图片
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*/
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public BufferedImage genRandomCodeImage(StringBuffer randomCode) {
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// BufferedImage类是具有缓冲区的Image类
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BufferedImage image = new BufferedImage(WIDTH, HEIGHT,
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BufferedImage.TYPE_INT_BGR);
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// 获取Graphics对象,便于对图像进行各种绘制操作
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Graphics g = image.getGraphics();
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// 设置背景色
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g.setColor(getRandColor(200, 250));
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// 填充矩形面积
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g.fillRect(0, 0, WIDTH, HEIGHT);
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// 设置干扰线的颜色
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g.setColor(getRandColor(110, 120));
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// 绘制干扰线
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for (int i = 0; i <= LINE_NUM; i++) {
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drowLine(g);
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}
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// 绘制随机字符
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g.setFont(new Font(FONT_NAME, Font.PLAIN, FONT_SIZE));
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for (int i = 1; i <= STR_NUM; i++) {
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randomCode.append(drowString(g, i));
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}
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g.dispose();
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return image;
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}
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/**
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* 给定范围获得随机颜色
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*/
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private Color getRandColor(int fc, int bc) {
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if (fc > 255) {
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fc = 255;
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}
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if (bc > 255) {
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bc = 255;
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}
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int r = fc + random.nextInt(bc - fc);
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int g = fc + random.nextInt(bc - fc);
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int b = fc + random.nextInt(bc - fc);
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return new Color(r, g, b);
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}
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/**
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* 绘制字符串
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*/
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private String drowString(Graphics g, int i) {
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g.setColor(new Color(random.nextInt(101), random.nextInt(111), random
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.nextInt(121)));
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String rand = String.valueOf(getRandomString(random.nextInt(RANDOM_STRS
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.length())));
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g.translate(random.nextInt(3), random.nextInt(3));
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g.drawString(rand, 13 * i, 16);
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return rand;
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}
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/**
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* 绘制干扰线
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*/
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private void drowLine(Graphics g) {
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int x = random.nextInt(WIDTH);
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int y = random.nextInt(HEIGHT);
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int x0 = random.nextInt(16);
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int y0 = random.nextInt(16);
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g.drawLine(x, y, x + x0, y + y0);
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}
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/**
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* 获取随机的字符
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*/
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private String getRandomString(int num) {
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return String.valueOf(RANDOM_STRS.charAt(num));
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}
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public static void main(String[] args) {
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CaptchaUtil tool = new CaptchaUtil();
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StringBuffer code = new StringBuffer();
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BufferedImage image = tool.genRandomCodeImage(code);
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System.out.println("random code : " + code);
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try {
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// 将内存中的图片通过流动形式输出到客户端
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ImageIO.write(image, "JPEG", new FileOutputStream(new File(
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"random-code.jpg")));
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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