不说废话，直接来代码：
生产验证码
/**
* Copyright © 2012-2013 <a href="https://github.com/thinkgem/jeesite">JeeSite</a> All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
*/
package cn.creditharmoney.common.servlet;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Random;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.lang.math.NumberUtils;
import org.apache.commons.lang3.StringUtils;
/**
* 生成随机验证码
*/
@SuppressWarnings("serial")
public class ValidateCodeServlet extends HttpServlet {
public static final String VALIDATE_CODE = "validateCode";
private int w = 70;
private int h = 26;
public ValidateCodeServlet() {
super();
}
public void destroy() {
super.destroy();
}
public static boolean validate(HttpServletRequest request, String validateCode){
String code = (String)request.getSession().getAttribute(VALIDATE_CODE);
return validateCode.toUpperCase().equals(code);
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String validateCode = request.getParameter(VALIDATE_CODE); // AJAX验证，成功返回true
if (StringUtils.isNotBlank(validateCode)){
response.getOutputStream().print(validate(request, validateCode)?"true":"false");
}else{
this.doPost(request, response);
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
createImage(request,response);
}
private void createImage(HttpServletRequest request,
HttpServletResponse response) throws IOException {
response.setHeader("Pragma", "no-cache");
response.setHeader("Cache-Control", "no-cache");
response.setDateHeader("Expires", 0);
response.setContentType("image/jpeg");
/*
* 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
*/
String width = request.getParameter("width");
String height = request.getParameter("height");
if (StringUtils.isNumeric(width) && StringUtils.isNumeric(height)) {
w = NumberUtils.toInt(width);
h = NumberUtils.toInt(height);
}
BufferedImage image = new BufferedImage(w, h, BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
/*
* 生成背景
*/
createBackground(g);
/*
* 生成字符
*/
String s = createCharacter(g);
request.getSession().setAttribute(VALIDATE_CODE, s);
g.dispose();
OutputStream out = response.getOutputStream();
ImageIO.write(image, "JPEG", out);
out.close();
}
private Color getRandColor(int fc,int bc) {
int f = fc;
int b = bc;
Random random=new Random();
if(f>255) {
f=255;
}
if(b>255) {
b=255;
}
return new Color(f+random.nextInt(b-f),f+random.nextInt(b-f),f+random.nextInt(b-f));
}
private void createBackground(Graphics g) {
// 填充背景
g.setColor(getRandColor(220,250));
g.fillRect(0, 0, w, h);
// 加入干扰线条
for (int i = 0; i < 8; i++) {
g.setColor(getRandColor(40,150));
Random random = new Random();
int x = random.nextInt(w);
int y = random.nextInt(h);
int x1 = random.nextInt(w);
int y1 = random.nextInt(h);
g.drawLine(x, y, x1, y1);
}
}
private String createCharacter(Graphics g) {
char[] codeSeq = {'9' };
String[] fontTypes = {"\u5b8b\u4f53","\u65b0\u5b8b\u4f53","\u9ed1\u4f53","\u6977\u4f53","\u96b6\u4e66"};
Random random = new Random();
StringBuilder s = new StringBuilder();
for (int i = 0; i < 4; i++) {
String r = String.valueOf(codeSeq[random.nextInt(codeSeq.length)]);//random.nextInt(10));
g.setColor(new Color(50 + random.nextInt(100), 50 + random.nextInt(100), 50 + random.nextInt(100)));
g.setFont(new Font(fontTypes[random.nextInt(fontTypes.length)],Font.BOLD,26));
g.drawString(r, 15 * i + 5, 19 + random.nextInt(8));
// g.drawString(r, i*w/4, h-5);
s.append(r);
}
return s.toString();
}
}
验证随机验证码：
package cn.creditharmoney.common.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ValidateCodeSuccessServlet extends HttpServlet {
public static final String VALIDATE_CODE = "validateCode";
@Override
protected void service(HttpServletRequest arg0, HttpServletResponse arg1)
throws ServletException, IOException {
// TODO Auto-generated method stub
arg0.setCharacterEncoding("utf-8");
arg1.setContentType("text/html;charset=utf-8");
String str = (String) arg0.getParameter("captcha");
String code = (String)arg0.getSession().getAttribute(VALIDATE_CODE);
PrintWriter out = arg1.getWriter();
if(code.equals(str.toUpperCase())){
out.write("1");
}else{
out.write("2");
}
out.flush();
out.close();
}
}
前台验证：
$(function() {
$(".dsucess").hide();
$("#captcha").keyup(function() {
var captcha = $("#captcha").val();
if(captcha.length == 4){
$.ajax({
type : "POST",
url: "${ctx}/servlet/validateCodeSuccessServlet",
data : "captcha="+captcha,
dataType : 'json',
success: function(data,status){
if(data=="1"){
$(".dsucess").show();
}else{
$(".dsucess").hide();
}
}
});
}else{
$(".dsucess").hide();
}
});
});
web.xml配置
<!-- 随机验证码 -->
<servlet>
<servlet-name>ValidateCodeServlet</servlet-name>
<servlet-class>cn.creditharmoney.common.servlet.ValidateCodeServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ValidateCodeServlet</servlet-name>
<url-pattern>/servlet/validateCodeServlet</url-pattern>
</servlet-mapping>
<!-- 验证随机验证码 -->
<servlet>
<servlet-name>ValidateCodeSuccessServlet</servlet-name>
<servlet-class>cn.creditharmoney.common.servlet.ValidateCodeSuccessServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ValidateCodeSuccessServlet</servlet-name>
<url-pattern>/servlet/validateCodeSuccessServlet</url-pattern>
</servlet-mapping>
ok。搞定。大家有需要的就可以看看，有更好的验证码拿出来大家分享分享。