登陆验证码(struts2实现)

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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"%>

  
   

  
  
   
  
  验证码： 
    

  
 
  

2.web.xml

  
    index.jsp
  

  
  	struts2
  	org.apache.struts2.dispatcher.FilterDispatcher
  
  
  	struts2
  	/*
  

3.struts.xml

    
              
                
            image/jpeg      
            inputStream      
           
          

        
            /success.jsp
            /fail.jsp
        
    

4.RandomNumUtil.java

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

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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