package com.matrix.system.hive.plugin.util;
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import java.awt.Color;
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import java.awt.Font;
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import java.awt.Graphics;
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import java.awt.image.BufferedImage;
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import java.io.OutputStream;
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import java.util.Random;
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import javax.imageio.ImageIO;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpSession;
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/**
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*
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* @author Matrxi-J
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* @createTime 2014.08.30
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*/
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public class RandomValidateCode {
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public static final String RANDOMCODEKEY = "RANDOMVALIDATECODEKEY";// 放到session中的key
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private static Random random = new Random();
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// private String randString = "23456789ABCDEFGHJKLMNPQRSTUVWXYZ";//随机产生的字符串
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private static String randString = "0123456789";
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private static int width = 95;// 图片
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private static int height = 30;// 图片
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private static int lineSize = 40;// 干扰线数
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private static int stringNum = 4;// 随机产生字符数量
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/*
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* 获得字体
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*/
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private static Font getFont() {
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return new Font("Fixedsys", Font.CENTER_BASELINE, 24);
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}
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/*
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* 获得颜色
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*/
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private static Color getRandColor(int fc, int bc) {
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if (fc > 255)
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fc = 255;
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if (bc > 255)
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bc = 255;
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int r = fc + random.nextInt(bc - fc - 16);
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int g = fc + random.nextInt(bc - fc - 14);
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int b = fc + random.nextInt(bc - fc - 18);
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return new Color(r, g, b);
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}
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/**
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* 生成随机图片
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*/
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public static void newValidateImg(HttpServletRequest request, HttpServletResponse response) {
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HttpSession session = request.getSession();
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// BufferedImage类是具有缓冲区的ImageImage类是用于描述图像信息的类
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BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_BGR);
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Graphics g = image.getGraphics();// 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操
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g.fillRect(0, 0, width, height);
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g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 24));
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g.setColor(getRandColor(110, 133));
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// 绘制干扰
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for (int i = 0; i <= lineSize; 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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String randomString = "";
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for (int i = 1; i <= stringNum; i++) {
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randomString = drowString(g, randomString, i);
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}
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session.removeAttribute(RANDOMCODEKEY);
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session.setAttribute(RANDOMCODEKEY, randomString);
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g.dispose();
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try {
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OutputStream out = response.getOutputStream();
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ImageIO.write(image, "JPEG", out);// 将内存中的图片过流动形式输出到客户
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out.flush();
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out.close();
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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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* 绘制字符
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*/
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private static String drowString(Graphics g, String randomString, int i) {
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g.setFont(getFont());
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g.setColor(new Color(random.nextInt(101), random.nextInt(111), random.nextInt(121)));
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String rand = String.valueOf(getRandomString(random.nextInt(randString.length())));
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randomString += rand;
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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 randomString;
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}
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/*
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* 绘制干扰
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*/
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private static 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 xl = random.nextInt(13);
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int yl = random.nextInt(15);
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g.drawLine(x, y, x + xl, y + yl);
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}
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/*
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* 获取随机的字
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*/
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private static String getRandomString(int num) {
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return String.valueOf(randString.charAt(num));
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}
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}
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