登陆验证码(struts2实现)
2013-01-16 11:15
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原地址:/article/4148270.html
登陆验证码(struts2实现)
博客分类:小工具集合
struts
登陆验证码(struts2实现)
1.login.jsp
Java代码
<%@ 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>
<%@ 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>
2.web.xml
Java代码
<?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"?> <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>
3.struts.xml
Java代码
<?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" class="com.org.momo.action.RandomAction">
<result type="stream">
<param name="contentType">image/jpeg</param>
<param name="inputName">inputStream</param>
</result>
</action>
<action name="Login" class="com.org.momo.action.LoginAction">
<result name="success">/success.jsp</result>
<result name="error">/fail.jsp</result>
</action>
</package>
</struts>
<?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" class="com.org.momo.action.RandomAction"> <result type="stream"> <param name="contentType">image/jpeg</param> <param name="inputName">inputStream</param> </result> </action> <action name="Login" class="com.org.momo.action.LoginAction"> <result name="success">/success.jsp</result> <result name="error">/fail.jsp</result> </action> </package> </struts>
4.RandomNumUtil.java
Java代码
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.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); } }
5.RandomAction.java和LoginAction.java
Java代码
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;
}
}
}
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; } } }
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