Spring Mvc Captcha验证码实现(附Servlet实现方式)

注意了, 这里是Spring MVC是通过注解的方式实现的, 如果想知道如何使用Spring注解,自己去别的地方看看, 或者之后我会再写一篇新的文章!

前提: 需要jar包 kaptcha-2.3.2.jar 下载地址如下: 

http://code.google.com/p/kaptcha/downloads/list

1. Servlet实现方式

1.1web.xml如下:

	
		
		kaptcha
		com.google.code.kaptcha.servlet.KaptchaServlet
		
			
			kaptcha.border
			yes
		
		
			
			kaptcha.border.color
			105,179,90
				
		
			
			kaptcha.textproducer.font.color
			red
		
		
			
			kaptcha.image.width
			250
		
		
			
			kaptcha.image.height
			90
		
		
			
			kaptcha.textproducer.font.size
			70
		
		
			
			kaptcha.session.key
			code
		
		
			
			kaptcha.textproducer.char.length
			4
		
		
			
			kaptcha.textproducer.font.names
			宋体,楷体,微软雅黑
				
	

    
		kaptcha
		/kaptcha/kaptcha.jpg
	

1.2 JSP代码如下:

	

			

				

				

			
					

						
sec code:

						
					
				
			
		
	

		




		
		<%
			String c = (String)session.getAttribute(com.google.code.kaptcha.Constants.KAPTCHA_SESSION_KEY);
			String parm = (String) request.getParameter("kaptchafield");
			
			out.println("Parameter: " + parm + " ? Session Key: " + c + " : ");
			
			if (c != null && parm != null) {
				if (c.equals(parm)) {
					out.println("true");
				} else {
					out.println("false");
				}
			
		%>

二. Spring Mvc的实现

2.1 spring配置文件

	
		
			
				
					
						yes
						105,179,90
						blue
						125
						45
						45
						code
						4
						宋体,楷体,微软雅黑
					
				
			
		
	

2.2 Controller的实现

package com.vopzoon.app.base.captcha;

import java.awt.image.BufferedImage;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;

/**
 * 防止Captcha机器人登陆
 * @author liuwang
 *
 */
@Controller
@RequestMapping("/kaptcha/*")
public class CaptchaController {
	
	@Autowired
	private Producer captchaProducer = null;

	@RequestMapping
	public ModelAndView getKaptchaImage(HttpServletRequest request, HttpServletResponse response) throws Exception {
		HttpSession session = request.getSession();
		String code = (String)session.getAttribute(Constants.KAPTCHA_SESSION_KEY);
		System.out.println("******************验证码是: " + code + "******************");
		
		response.setDateHeader("Expires", 0);
		
		// Set standard HTTP/1.1 no-cache headers.
		response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
		
		// Set IE extended HTTP/1.1 no-cache headers (use addHeader).
		response.addHeader("Cache-Control", "post-check=0, pre-check=0");
		
		// Set standard HTTP/1.0 no-cache header.
		response.setHeader("Pragma", "no-cache");
		
		// return a jpeg
		response.setContentType("image/jpeg");
		
		// create the text for the image
		String capText = captchaProducer.createText();
		
		// store the text in the session
		session.setAttribute(Constants.KAPTCHA_SESSION_KEY, capText);
		
		// create the image with the text
		BufferedImage bi = captchaProducer.createImage(capText);
		ServletOutputStream out = response.getOutputStream();
		
		// write the data out
		ImageIO.write(bi, "jpg", out);
		try {
			out.flush();
		} finally {
			out.close();
		}
		return null;
	}

}

2.3 JSP代码

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>











		

      验证码:
                   
      
      

      
      看不清?换一张

哦, 差点忘记了, 不好意思, 这个东西我是抄袭他的, 地址如下:

http://ttaale.iteye.com/blog/808719