登陆验证码(struts2实现)
登陆验证码(struts2实现)
1.login.jsp
<%@ page language="java" import="java.util.*" pageEncoding="GBK"%><%@ taglib prefix ="s" uri="/struts-tags"%><html> <head><script type="text/javascript"> function changeValidateCode(obj) { /*** * 获取当前的时间作为参数，无具体意义 * 每次请求需要一个不同的参数，否则可能会返回同样的验证码 * 这和浏览器的缓存机制有关系，也可以把页面设置为不缓存，这样就不用这个参数了。 */var timenow = new Date().getTime(); obj.src="randPic.action?d="+timenow; } </script> </head> <body> <form name="" action="Login"> 验证码：<s:textfield name="code"></s:textfield><img src="randPic.action" onclick="changeValidateCode(this)" title="点击图片刷新验证码"/> <br/><input type="submit" value="登陆"/><input type="reset" value="重置"/> </form> </body></html><?xml version="1.0" encoding="UTF-8"?><web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping></web-app>
<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"><struts> <package name="iamge" extends="struts-default" namespace="/"> <action name="randPic" name="code">package com.org.momo.util ;import java.awt.Color;import java.awt.Font;import java.awt.Graphics;import java.awt.image.BufferedImage;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.util.Random;import javax.imageio.ImageIO;import javax.imageio.stream.ImageOutputStream;public class RandomNumUtil { private ByteArrayInputStream image;//图像 private String str;//验证码 private RandomNumUtil(){ init();//初始化属性 } /* * 取得RandomNumUtil实例 */ public static RandomNumUtil Instance(){ return new RandomNumUtil(); } /* * 取得验证码图片 */ public ByteArrayInputStream getImage(){ return this.image; } /* * 取得图片的验证码 */ public String getString(){ return this.str; } private void init() { // 在内存中创建图象 int width=85, height=20; BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); // 获取图形上下文 Graphics g = image.getGraphics(); // 生成随机类 Random random = new Random(); // 设定背景色 g.setColor(getRandColor(200,250)); g.fillRect(0, 0, width, height); // 设定字体 g.setFont(new Font("Times New Roman",Font.PLAIN,18)); // 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到 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); } // 取随机产生的认证码(6位数字) String sRand=""; for (int i=0;i<4;i++){ String rand=String.valueOf(random.nextInt(10)); sRand+=rand; // 将认证码显示到图象中 g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110))); // 调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成 g.drawString(rand,13*i+6,16); } //赋值验证码 this.str=sRand; //图象生效 g.dispose(); ByteArrayInputStream input=null; ByteArrayOutputStream output = new ByteArrayOutputStream(); try{ ImageOutputStream imageOut = ImageIO.createImageOutputStream(output); ImageIO.write(image, "JPEG", imageOut); imageOut.close(); input = new ByteArrayInputStream(output.toByteArray()); }catch(Exception e){ System.out.println("验证码图片产生出现错误："+e.toString()); } this.image=input;/* 赋值图像 */ } /* * 给定范围获得随机颜色 */ private 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); } } package com.org.momo.action ;import java.io.ByteArrayInputStream;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport;import com.org.momo.util.RandomNumUtil;public class RandomAction extends ActionSupport{ private ByteArrayInputStream inputStream; public String execute() throws Exception{ RandomNumUtil rdnu=RandomNumUtil.Instance(); this.setInputStream(rdnu.getImage());//取得带有随机字符串的图片 ActionContext.getContext().getSession().put("sessionCode", rdnu.getString());//取得随机字符串放入HttpSession return SUCCESS; } public void setInputStream(ByteArrayInputStream inputStream) { this.inputStream = inputStream; } public ByteArrayInputStream getInputStream() { return inputStream; } } package com.org.momo.action;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport;public class LoginAction extends ActionSupport{private String code; public String getCode() { return code; } public void setCode(String code) { this.code = code; } public String execute() throws Exception{ String sessionCode=(String)(ActionContext.getContext().getSession().get("sessionCode")); if(sessionCode.equals(this.getCode())) { return SUCCESS; }else{ return ERROR; } }}