/**
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* Copyright © 2015-2020 <a href="http://www.jeeplus.org/">JeePlus</a> All rights reserved.
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*/
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package com.jeeplus.common.servlet;
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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.IOException;
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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.ServletException;
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import javax.servlet.http.HttpServlet;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import org.apache.commons.lang3.math.NumberUtils;
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import org.apache.commons.lang3.StringUtils;
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/**
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* 生成随机验证码
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* @author jeeplus
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* @version 2014-7-27
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*/
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@SuppressWarnings("serial")
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public class ValidateCodeServlet extends HttpServlet {
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public static final String VALIDATE_CODE = "validateCode";
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private int w = 70;
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private int h = 26;
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public ValidateCodeServlet() {
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super();
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}
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public void destroy() {
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super.destroy();
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}
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public static boolean validate(HttpServletRequest request, String validateCode){
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String code = (String)request.getSession().getAttribute(VALIDATE_CODE);
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return validateCode.toUpperCase().equals(code);
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}
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public void doGet(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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String validateCode = request.getParameter(VALIDATE_CODE); // AJAX验证，成功返回true
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if (StringUtils.isNotBlank(validateCode)){
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response.getOutputStream().print(validate(request, validateCode)?"true":"false");
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}else{
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this.doPost(request, response);
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}
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}
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public void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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createImage(request,response);
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}
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private void createImage(HttpServletRequest request,
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HttpServletResponse response) throws IOException {
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response.setHeader("Pragma", "no-cache");
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response.setHeader("Cache-Control", "no-cache");
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response.setDateHeader("Expires", 0);
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response.setContentType("image/jpeg");
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/*
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* 得到参数高，宽，都为数字时，则使用设置高宽，否则使用默认值
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*/
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String width = request.getParameter("width");
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String height = request.getParameter("height");
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if (StringUtils.isNumeric(width) && StringUtils.isNumeric(height)) {
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w = NumberUtils.toInt(width);
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h = NumberUtils.toInt(height);
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}
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BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
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Graphics g = image.getGraphics();
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/*
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* 生成背景
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*/
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createBackground(g);
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/*
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* 生成字符
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*/
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String s = createCharacter(g);
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request.getSession().setAttribute(VALIDATE_CODE, s);
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g.dispose();
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OutputStream out = response.getOutputStream();
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ImageIO.write(image, "JPEG", out);
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out.close();
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}
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private Color getRandColor(int fc,int bc) {
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int f = fc;
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int b = bc;
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Random random=new Random();
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if(f>255) {
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f=255;
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}
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if(b>255) {
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b=255;
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}
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return new Color(f+random.nextInt(b-f),f+random.nextInt(b-f),f+random.nextInt(b-f));
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}
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private void createBackground(Graphics g) {
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// 填充背景
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g.setColor(getRandColor(220,250));
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g.fillRect(0, 0, w, h);
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// 加入干扰线条
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for (int i = 0; i < 8; i++) {
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g.setColor(getRandColor(40,150));
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Random random = new Random();
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int x = random.nextInt(w);
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int y = random.nextInt(h);
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int x1 = random.nextInt(w);
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int y1 = random.nextInt(h);
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g.drawLine(x, y, x1, y1);
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}
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}
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private String createCharacter(Graphics g) {
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char[] codeSeq = {'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'J',
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'K', 'M', 'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
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'X', 'Y', 'Z', '2', '3', '4', '5', '6', '7', '8', '9' };
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String[] fontTypes = {"Arial","Arial Black","AvantGarde Bk BT","Calibri"};
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Random random = new Random();
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StringBuilder s = new StringBuilder();
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for (int i = 0; i < 4; i++) {
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String r = String.valueOf(codeSeq[random.nextInt(codeSeq.length)]);//random.nextInt(10));
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g.setColor(new Color(50 + random.nextInt(100), 50 + random.nextInt(100), 50 + random.nextInt(100)));
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g.setFont(new Font(fontTypes[random.nextInt(fontTypes.length)],Font.BOLD,26));
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g.drawString(r, 15 * i + 5, 19 + random.nextInt(8));
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// g.drawString(r, i*w/4, h-5);
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s.append(r);
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}
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return s.toString();
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}
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}
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