最近需要做一个验证码信息，在网上找了些验证码组件，选择了SimpleCaptcha组件，java服务器端代码，简单方便使用。
对于此组件里的中文字的验证码，不是很合适，有时候会出现乱码情况，我认为如果想要加入中文字的验证，自己实现匹配就行了。
我这里只做抛砖引玉，贴出主要代码，源码包，SimpleCaptcha组件的源码和DOCS供参考使用(全包超过10mb，不让上传啊)。如果只是用数字和英文字母使用验证码，不用考虑自定义的验证码SimpleCaptchaFilter.java。后台代码很容易改成SpringMVC等使用，我就不多说啦，show me the code.
效果：
附件：Test.zip是我已实现的源码工程
docs.zip是组件文档
examples.zip是组件例子
Java.zip是组件源码
1.captcha.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>验证码</title>
<script type="text/javascript" src="<%=basePath %>/js/jquery.js" ></script>
</head>
<body>
<img id="code" style="cursor:pointer;" alt="看不清楚?点图标可以换一个" title="看不清楚?点图标可以换一个" />
<form action="<%=basePath %>/CheckCode" method="post">
<input id="answer" name="answer" />
<input id="submitBtn" type="button" value="提交" name="submit"/>
</form>
<script type="text/javascript">
$(function(){
var imgCode = $('#code');
$(imgCode).attr('src',"<%=basePath %>/simpleImg");
$(imgCode).click(function(){
$(this).attr('src',"<%=basePath %>/simpleImg");
});
$('#submitBtn').click(function(){
$.post('<%=basePath %>/CheckCode?answer='+$('#answer').val(),function(data){
if (data=='true'){
window.location.href="<%=basePath %>/captchaSuccess.jsp";
}else{
alert("验证码错误！");
return false;
}
});
});
});
</script>
</body>
</html>
2.captchaSuccess.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>验证码</title>
</head>
<body>
你成功了！
</body>
</html>
3.CheckCode.java
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;
import nl.captcha.Captcha;
/**
* Servlet implementation class CheckCode
*/
public class CheckCode extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public CheckCode() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Captcha captcha = (Captcha) request.getSession().getAttribute(Captcha.NAME);
request.setCharacterEncoding("UTF-8");
String answer = request.getParameter("answer");
System.out.println(captcha.isCorrect(answer));
PrintWriter writer = response.getWriter();
writer.print(captcha.isCorrect(answer));
writer.flush();
writer.close();
}
}
4.SimpleCaptchaFilter.java
import static nl.captcha.Captcha.NAME;
import java.awt.Color;
import java.awt.Font;
import java.awt.image.BufferedImage;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import nl.captcha.Captcha;
import nl.captcha.Captcha.Builder;
import nl.captcha.backgrounds.FlatColorBackgroundProducer;
import nl.captcha.gimpy.BlockGimpyRenderer;
import nl.captcha.servlet.CaptchaServletUtil;
import nl.captcha.text.producer.ChineseTextProducer;
import nl.captcha.text.producer.DefaultTextProducer;
import nl.captcha.text.renderer.ColoredEdgesWordRenderer;
import nl.captcha.text.renderer.WordRenderer;
/**
* @className:SimpleCaptchaFilter.java
* @classDescription: 扩展默认的simpleCaptcha
* @author:zz
* @createTime:2015-3-30
*/
public class SimpleCaptchaFilter extends HttpServlet{
private static final String PARAM_HEIGHT = "height"; //高度 默认为50
private static final String PARAM_WIDTH = "width";//宽度 默认为200
private static final String PAEAM_NOISE="noise";//干扰线条 默认是没有干扰线条
private static final String PAEAM_TEXT="text";//文本
protected int _width = 200;
protected int _height = 50;
protected boolean _noise=false;
protected String _text=null;
/**
* 初始化过滤器.将配置文件的参数文件赋值
* @throws ServletException
*/
@Override
public void init() throws ServletException {
if (getInitParameter(PARAM_HEIGHT) != null) {
_height = Integer.valueOf(getInitParameter(PARAM_HEIGHT));
}
if (getInitParameter(PARAM_WIDTH) != null) {
_width = Integer.valueOf(getInitParameter(PARAM_WIDTH));
}
if (getInitParameter(PAEAM_NOISE) != null) {
_noise = Boolean.valueOf(getInitParameter(PAEAM_NOISE));
}
if (getInitParameter(PAEAM_NOISE) != null) {
_text = String.valueOf(getInitParameter(PAEAM_TEXT));
}
}
/**
* 因为获取图片只会有get方法
*/
@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
Builder builder=new Captcha.Builder(_width, _height);
//增加边框
builder.addBorder();
//干扰线
/*CurvedLineNoiseProducer nosi = new CurvedLineNoiseProducer(Color.green,5);
builder.addNoise(nosi);*/
//是否增加干扰线条
if(_noise==true)
builder.addNoise();
//----------------自定义字体大小-----------
//自定义设置字体颜色和大小 最简单的效果 多种字体随机显示
List<Font> fontList = new ArrayList<Font>();
fontList.add(new Font("Arial", Font.ITALIC, 40));//可以设置斜体之类的
//fontList.add(new Font("Courier", Font.BOLD, 40));
/*List<Color> colorList = new ArrayList<Color>();
colorList.add(Color.green);
colorList.add(Color.BLUE);
DefaultWordRenderer dwr=new DefaultWordRenderer(colorList,fontList);*/
//加入多种颜色后会随机显示 字体空心
List<Color> colorList=new ArrayList<Color>();
colorList.add(Color.green);
// colorList.add(Color.white);
colorList.add(Color.blue);
ColoredEdgesWordRenderer cwr= new ColoredEdgesWordRenderer(colorList,fontList);
WordRenderer wr=cwr;
//增加文本，默认为5个随机字符.
if(_text==null){
builder.addText();
}else{
String[]ts=_text.split(",");
for(int i=0;i<ts.length;i++){
String[] ts1=ts[i].split(":");
if("chinese".equals(ts1[0])){
builder.addText(new ChineseTextProducer(Integer.parseInt(ts1[1])),wr);
}else if("number".equals(ts1[0])){
//这里没有0和1是为了避免歧义 和字母I和O
char[] numberChar = new char[] { '2', '3', '4', '5', '6', '7', '8' };
builder.addText(new DefaultTextProducer(Integer.parseInt(ts1[1]),numberChar),wr);
}else if("word".equals(ts1[0])){
//原理同上
char[] numberChar = new char[] {'a','A', 'b', 'B','c','C', 'd','D',
'e','E', 'f', 'F','g','G', 'h','H', 'k','K', 'm','M', 'n','N', 'p','P', 'r','R', 'w','W', 'x','X', 'y','Y' };
builder.addText(new DefaultTextProducer(Integer.parseInt(ts1[1]),numberChar),wr);
}/*else{
builder.addText(new DefaultTextProducer(Integer.parseInt(ts1[1])),wr);
}*/
}
}
//--------------添加背景-------------
//设置背景渐进效果 以及颜色 form为开始颜色，to为结束颜色
//GradiatedBackgroundProducer gbp=new GradiatedBackgroundProducer();
//gbp.setFromColor(Color.yellow);
// gbp.setToColor(Color.red);
//无渐进效果，只是填充背景颜色
// FlatColorBackgroundProducer fbp=new FlatColorBackgroundProducer(Color.red);
//加入网纹--一般不会用
// SquigglesBackgroundProducer sbp=new SquigglesBackgroundProducer();
// 没发现有什么用,可能就是默认的
// TransparentBackgroundProducer tbp = new TransparentBackgroundProducer();
//FlatColorBackgroundProducer fbp = new FlatColorBackgroundProducer();
//BufferedImage bufferedImage = ImageIO.read(new FileInputStream("E:\\eclipsespace2\\oms_portal\\WebContent\\images\\content\\table-info.png"));
//fbp.addBackground(bufferedImage);
//builder.addBackground(fbp);
//---------装饰字体---------------
// 字体边框齿轮效果 默认是3
builder.gimp(new BlockGimpyRenderer(1));
//波纹渲染 相当于加粗
// builder.gimp(new RippleGimpyRenderer());
//修剪--一般不会用
// builder.gimp(new ShearGimpyRenderer(Color.red));
//加网--第一个参数是横线颜色，第二个参数是竖线颜色
// builder.gimp(new FishEyeGimpyRenderer(Color.red,Color.yellow));
//加入阴影效果 默认3，75
// builder.gimp(new DropShadowGimpyRenderer());
//创建对象
Captcha captcha = builder .build();
CaptchaServletUtil.writeImage(resp, captcha.getImage());
req.getSession().setAttribute(NAME, captcha);
}
}
5.web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>Test</display-name> <!-- 默认简单的验证码处理 --> <servlet> <servlet-name>SimpleCaptcha</servlet-name> <servlet-class>nl.captcha.servlet.SimpleCaptchaServlet</servlet-class> <init-param> <param-name>width</param-name> <param-value>250</param-value> </init-param> <init-param> <param-name>height</param-name> <param-value>75</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>SimpleCaptcha</servlet-name> <url-pattern>/simpleImg</url-pattern> </servlet-mapping> <!-- 自定义验证码 --> <!-- <servlet> <servlet-name>SimpleCaptcha</servlet-name> <servlet-class>SimpleCaptchaFilter</servlet-class> <init-param> <param-name>width</param-name> <param-value>200</param-value> </init-param> <init-param> <param-name>height</param-name> <param-value>50</param-value> </init-param> 干扰线 <init-param> <param-name>noise</param-name> <param-value>true</param-value> </init-param> 意思是3个单词，3个数字 <init-param> <param-name>text</param-name> <param-value>word:3,number:3</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>SimpleCaptcha</servlet-name> <url-pattern>/simpleImg</url-pattern> </servlet-mapping> --> <!-- 验证码检验 --> <servlet> <description></description> <display-name>CheckCode</display-name> <servlet-name>CheckCode</servlet-name> <servlet-class>CheckCode</servlet-class> </servlet> <servlet-mapping> <servlet-name>CheckCode</servlet-name> <url-pattern>/CheckCode</url-pattern> </servlet-mapping> </web-app>
参考：