jsp验证码
请教大家这样的验证码用jsp怎么做啊，这个是php的
[解决办法]
jCaptcha 和 patchca :
jCaptcha: http://jcaptcha.sourceforge.net/
patchca: http://code.google.com/p/patchca/
[解决办法]
我这里有以前项目里用过的，与大家分享一下：
文件上传处理页面：
<body>
<%
// 新建一个SmartUpload对象
SmartUpload su = new SmartUpload();
// 上传初始化
su.initialize(pageContext);
// 设定上传限制
// 1.限制每个上传文件的最大长度。
// su.setMaxFileSize(10000);
// 2.限制总上传数据的长度。
// su.setTotalMaxFileSize(20000);
// 3.设定允许上传的文件（通过扩展名限制）,仅允许doc,txt文件。
// su.setAllowedFilesList("doc,txt");
// 4.设定禁止上传的文件（通过扩展名限制）,禁止上传带有exe,bat,
jsp,htm,html扩展名的文件和没有扩展名的文件。
// su.setDeniedFilesList("exe,bat,jsp,htm,html,,");
// 上传文件
su.upload();
// 将上传文件全部保存到指定目录
int count = su.save("/upload");
out.println(count+"个文件上传成功！<br>");
// 利用Request对象获取参数之值
out.println("TEST="+su.getRequest().getParameter("TEST")
+"<BR><BR>");
// 逐一提取上传文件信息，同时可保存文件。
for (int i=0;i<su.getFiles().getCount();i++)
{
com.jspsmart.upload.File file = su.getFiles().getFile(i);
// 若文件不存在则继续
if (file.isMissing()) continue;
// 显示当前文件信息
out.println("<TABLE BORDER=1>");
out.println("<TR><TD>表单项名（FieldName）</TD><TD>"
+ file.getFieldName() + "</TD></TR>");
out.println("<TR><TD>文件长度（Size）</TD><TD>" +
file.getSize() + "</TD></TR>");
out.println("<TR><TD>文件名（FileName）</TD><TD>"
+ file.getFileName() + "</TD></TR>");
out.println("<TR><TD>文件扩展名（FileExt）</TD><TD>"
+ file.getFileExt() + "</TD></TR>");
out.println("<TR><TD>文件全名（FilePathName）</TD><TD>"
+ file.getFilePathName() + "</TD></TR>");
out.println("</TABLE><BR>");
// 将文件另存
// file.saveAs("/upload/" + myFile.getFileName());
// 另存到以WEB应用程序的根目录为文件根目录的目录下
// file.saveAs("/upload/" + myFile.getFileName(),
su.SAVE_VIRTUAL);
// 另存到操作系统的根目录为文件根目录的目录下
// file.saveAs("c:\\temp\\" + myFile.getFileName(),
su.SAVE_PHYSICAL);
}
%>
</body>
提交页面：
<%
request.setCharacterEncoding("utf-8");
//获取Session会话中缓存的验证码
String rand = (String)session.getAttribute("rand");
if(rand==null){
System.out.print("问题出现");
}
//获取用户输入的验证码
String input = request.getParameter("input");
if (rand.equals(input)) {
out.println("验证成功！！");
}else{
out.println("验证失败！！");
}
%>
显示页面：doTest。jsp
<html>
<head>
<title>登录页面</title>
<script language="javascript">
/*在文字上使验证码刷新 */
function reloadImage(url){
var img = document.getElementById("img");
img.src = url+"?" + Math.random();
}
</script>
</head>
<body>
<form id="dForm" method="post" action="doTest.jsp">
验证码:
<input type="text" name="input" size="12" >
<img id="img" border=0 src="code.jsp" />
<a href="javaScript:reloadImage('code.jsp');">看不清</a>
<input type="button" value="看不清"
onclick="javascript:document.getElementById('img').src='code.jsp?'+Math.random()">
<br/>
<input type="submit" value="验证测试">
</form>
</body>
</html>
[解决办法]
patchca的例子的源码:
- Java code
package org.patchca.demo;import java.awt.BorderLayout;import java.awt.Button;import java.awt.Color;import java.awt.Dimension;import java.awt.Frame;import java.awt.Graphics;import java.awt.Panel;import java.awt.Toolkit;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.WindowAdapter;import java.awt.event.WindowEvent;import java.awt.image.BufferedImage;import org.patchca.color.SingleColorFactory;import org.patchca.filter.predefined.CurvesRippleFilterFactory;import org.patchca.filter.predefined.DiffuseRippleFilterFactory;import org.patchca.filter.predefined.DoubleRippleFilterFactory;import org.patchca.filter.predefined.MarbleRippleFilterFactory;import org.patchca.filter.predefined.WobbleRippleFilterFactory;import org.patchca.service.ConfigurableCaptchaService;public class PatchcaFilterDemo extends Frame implements ActionListener { private static final long serialVersionUID = 6698906953413370733L; private BufferedImage img; private Button reloadButton; private int counter; public PatchcaFilterDemo() { super("Patchca demo"); setSize(200, 140); Dimension dim = Toolkit.getDefaultToolkit().getScreenSize(); int x = (dim.width-this.getSize().width)/2; int y = (dim.height-this.getSize().height)/2; setLocation(x, y); Panel bottom = new Panel(); reloadButton = new Button("Next filter"); reloadButton.addActionListener(this); bottom.add(reloadButton); add(BorderLayout.SOUTH, bottom); addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent we) { dispose(); } }); } public void update(Graphics g) { paint(g); } public void paint(Graphics g) { if (img == null) { createImage(); } if (img != null) { g.drawImage(img, 20, 30, this); } } public void createImage() { ConfigurableCaptchaService cs = new ConfigurableCaptchaService(); cs.setColorFactory(new SingleColorFactory(new Color(25, 60, 170))); switch (counter % 5) { case 0: cs.setFilterFactory(new CurvesRippleFilterFactory(cs.getColorFactory())); break; case 1: cs.setFilterFactory(new MarbleRippleFilterFactory()); break; case 2: cs.setFilterFactory(new DoubleRippleFilterFactory()); break; case 3: cs.setFilterFactory(new WobbleRippleFilterFactory()); break; case 4: cs.setFilterFactory(new DiffuseRippleFilterFactory()); break; } img = cs.getCaptcha().getImage(); counter++; } @Override public void actionPerformed(ActionEvent evt) { if (evt.getSource() == reloadButton) { createImage(); repaint(); } } public static void main(String[] args) { PatchcaFilterDemo f = new PatchcaFilterDemo(); f.setVisible(true); }}
[解决办法]
写了个使用patchca生成验证码，然后进行验证的例子，可以参考一下：http://www.cppblog.com/biao/archive/2010/12/28/137589.html
[解决办法]
image.jsp
<%@ page contentType="image/jpeg" import="java.awt.*,
java.awt.image.*,java.util.*,javax.imageio.*" %>
<%!
Color getRandColor(int fc,int bc)
{
Random random = new Random();
if(fc>255) fc=255;
if(bc>255) bc=255;
int r=fc+random.nextInt(bc-fc);
int g=fc+random.nextInt(bc-fc);
int b=fc+random.nextInt(bc-fc);
return new Color(r,g,b);
}
%>
<%
out.clear();//这句针对resin服务器，如果是tomacat可以不要这句
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
int width=60, height=20;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
Random random = new Random();
g.setColor(getRandColor(200,250));
g.fillRect(0, 0, width, height);
g.setFont(new Font("Times New Roman",Font.PLAIN,18));
g.setColor(getRandColor(160,200));
for (int i=0;i<155;i++)
{
int x = random.nextInt(width);
int y = random.nextInt(height);
int xl = random.nextInt(12);
int yl = random.nextInt(12);
g.drawLine(x,y,x+xl,y+yl);
}
String sRand="";
for (int i=0;i<4;i++){
String rand=String.valueOf(random.nextInt(10));
sRand+=rand;
g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
g.drawString(rand,13*i+6,16);
}
// 将认证码存入SESSION
session.setAttribute("rand",sRand);
g.dispose();
ImageIO.write(image, "JPEG", response.getOutputStream());
%>