跪求！！！有哪位做过的高手指点一下啊！

yamengli 2012-05-11 10:36:06

请问哪位前辈做过关于验证码方面的东西，用java实现的最好，请指点一下，太谢谢你们了！

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X497347200 2012-05-13

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	<tr>

								<td valign="middle" align="right">

									验证码:

									

								</td>

								<td valign="middle" align="left">

									<input type="text" class="inputgri" name="number" /><span><c:if test="${empty error}" var="e" scope="request"></c:if>

						<c:if test="${!e}">${error}</c:if></span><img id="num" src="checkcode" />

									<a href="javascript:;" onclick="document.getElementById('num').src = 'checkcode?'+(new Date()).getTime()">换一张</a>

								</td>

							</tr>



<servlet>

    <description>This is the description of my J2EE component</description>

    <display-name>This is the display name of my J2EE component</display-name>

    <servlet-name>CheckCodeServlet</servlet-name>

    <servlet-class>servlet.CheckCodeServlet</servlet-class>

  </servlet>



  <servlet-mapping>

    <servlet-name>CheckCodeServlet</servlet-name>

    <url-pattern>/checkcode</url-pattern>

  </servlet-mapping>

X497347200 2012-05-13

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package 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;

import javax.servlet.http.HttpSession;



import java.awt.Color; 

import java.awt.Graphics; 

import java.awt.image.BufferedImage; 

import java.io.IOException; 

import java.io.OutputStream; 

import java.util.Random; 



import com.sun.image.codec.jpeg.JPEGCodec; 

import com.sun.image.codec.jpeg.JPEGImageEncoder; 



public class CheckCodeServlet extends HttpServlet {



	

	@Override

	protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

		//设置content-type消息头，告诉浏览器， 

		//返回的数据类型 

		response.setContentType("image/jpeg"); 

		// 图片的内存映像 

		BufferedImage image = 

			new BufferedImage(60, 20, 

				BufferedImage.TYPE_INT_RGB); 

		// 获得画笔对象 

		Random r = new Random(); 

		Graphics g = image.getGraphics(); 

		g.setColor( 

				new Color(r.nextInt(255), 

						r.nextInt(255), r.nextInt(255))); 

		g.fillRect(0, 0, 60, 20); 

		g.setColor(new Color(0,0,0)); 

		String number = String.valueOf( 

				r.nextInt(99999)); 

		HttpSession session=request.getSession();

		session.setAttribute("number",number);

		g.drawString(number, 5, 15); 



		// 压缩成jpeg格式 

		OutputStream os = response 

		.getOutputStream(); 

		JPEGImageEncoder encoder = 

			JPEGCodec.createJPEGEncoder(os); 

		// 把BufferedImage对象中的图像信息编码后 

		// 向创建该对象(encoder)时指定的输出流输出 

		encoder.encode(image); 

	}



	public CheckCodeServlet() {

		super();

	}



	/**

	 * Destruction of the servlet. <br>

	 */

	public void destroy() {

		super.destroy(); // Just puts "destroy" string in log

		// Put your code here

	}



	/**

	 * The doGet method of the servlet. <br>

	 *

	 * This method is called when a form has its tag value method equals to get.

	 * 

	 * @param request the request send by the client to the server

	 * @param response the response send by the server to the client

	 * @throws ServletException if an error occurred

	 * @throws IOException if an error occurred

	 */

	public void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {



		response.setContentType("text/html");

		PrintWriter out = response.getWriter();

		out

				.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");

		out.println("<HTML>");

		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");

		out.println("  <BODY>");

		out.print("    This is ");

		out.print(this.getClass());

		out.println(", using the GET method");

		out.println("  </BODY>");

		out.println("</HTML>");

		out.flush();

		out.close();

	}



	/**

	 * The doPost method of the servlet. <br>

	 *

	 * This method is called when a form has its tag value method equals to post.

	 * 

	 * @param request the request send by the client to the server

	 * @param response the response send by the server to the client

	 * @throws ServletException if an error occurred

	 * @throws IOException if an error occurred

	 */

	public void doPost(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {



		response.setContentType("text/html");

		PrintWriter out = response.getWriter();

		out

				.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");

		out.println("<HTML>");

		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");

		out.println("  <BODY>");

		out.print("    This is ");

		out.print(this.getClass());

		out.println(", using the POST method");

		out.println("  </BODY>");

		out.println("</HTML>");

		out.flush();

		out.close();

	}



	/**

	 * Initialization of the servlet. <br>

	 *

	 * @throws ServletException if an error occure

	 */

	public void init() throws ServletException {

		// Put your code here

	}



}

heroleader 2012-05-13

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楼主，，我的博客里面有详细内容，，一定能帮到你

http://blog.csdn.net/wangbaoyin/article/details/7541436

BankingRegulatorLLM 2012-05-13

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上个月刚做完的一个验证码程序，完整的，
用的是struts做的，你下下来直接部署到myeclise里就可以看效果了。。
http://download.csdn.net/detail/fengjssy/4162134

不懂的留言。

MiceRice 2012-05-11

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大多数人都做过，其实并不复杂，关键是你要知道大致原理。

主页面index.jsp：包含<img src="code.jsp">片段，用于显示验证码图片；以及FORM表单，将用户输入的验证码值，提交给check.jsp进行检查
验证码页面code.jsp：用随机数生成验证码值，并将验证码的值保存在session中；然后以图片形式生成验证码内容（Google大把源代码)，发送给浏览器；
检查页面check.jsp：从session中取回所生成的验证码值，与用户所输入的验证码值进行比较。

先理解总体框架。