jsp页面验证码产生及刷新问题

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jsp验证码及刷新

2009-02-12 22:36:27| 分类： jsp|字号订阅

说明:生成验证码(image.jsp),用户注册(register.jsp) 验证(UserAction.java)

image.jsp:

<%@ page contentType="image/jpeg" pageEncoding="gb2312" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" %>
    <%!
    Color getRandColor(int fc,int bc){//给定范围获得随机颜色
            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);
            }
    %>
    <%
    //设置页面不缓存
    response.setHeader("Pragma","No-cache");
    response.setHeader("Cache-Control","no-cache");
    response.setDateHeader("Expires", 0);

    // 在内存中创建图象
    int width=60, 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));

    //画边框
    //g.setColor(new Color());
    //g.drawRect(0,0,width-1,height-1);

    // 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(4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);
    }

// 将认证码存入SESSION
session.setAttribute("sysValidation",sRand);

// 图象生效
g.dispose();

// 输出图象到页面
ImageIO.write(image, "JPEG", response.getOutputStream());
out.clear();
out = pageContext.pushBody();

register.jsp:

<%@ page language="java" contentType="text/html; charset=gb2312"
    pageEncoding="gb2312"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>添加后台管理员</title>
<script type="text/javascript">
function check(){
  username=document.manager.username;
  pwd=document.manager.password;
  repwd=document.manager.repassword;
  if(username.value.length==0){
   alert("用户名不能为空");
   username.focus();
   return false;
  }else if(username.value.length<6||username.value.lengh>30){
   alert("用户长度只在6到30之间");
   usernme.value="";
   pwd.focus();
   return false;
  }else if(pwd.value.length==0){
   alert("密码不能为空");
   pwd.focus();
   return false;
  }else if(pwd.value.length<6||pwd.value.lengh>30){
   alert("密码长度只在6到30之间");
   pwd.value="";repwd.value="";
   pwd.focus();
   return false;
  }
  else if(pwd.value!=repwd.value){
   alert("两次输入的密码不相等");
   pwd.value="";repwd.value="";
   pwd.focus();
   return false;
  }
  return true;
}
//验证码刷新
function reLoadImage(){document.getElementById("valimg").src="tool/image.jsp?r="+ Math.random();}

//注意后面的随机数,去掉则不能刷新，本人把Math.random()没写就一直刷新不出来，终于看到此文才改正过来了
</script>
</head>
<body>
<div>添加后台管理员</div>
<form name="manager" action="bbsmanageradd" method="post" onsubmit="return check();">
<div>用户名:<input type="text" name="username"></div>
<div>密码:<input type="password" name="password"></div>
<div>再次输入密码:<input type="password" name="repassword"></div>
<div>是否启用:<input type="radio" name="activestatus" value="1" checked>启用 <input type="radio" name="activestatus" value="0">暂不启用</div>
<div>管理员权限:</div>
<div>
<input type="checkbox" name="competence" value="1">用户管理
<input type="checkbox" name="competence" value="2">栏目管理
<input type="checkbox" name="competence" value="3">帖子管理
<input type="checkbox" name="competence" value="4">表情管理
</div>
<div>
<input type="checkbox" name="competence" value="5">通知管理
<input type="checkbox" name="competence" value="6">样式管理
<input type="checkbox" name="competence" value="7">关键字管理
</div>
<div>验证码:<input type="text" name="validation"> <img src="tool/image.jsp" title="点击刷新" name="valimg" id="valimg"> <a href="JavaScript:reLoadImage();">看不清</a> </div>

UserAction.java:

package bbs.action.admin;
import java.util.*;
import bbs.*;
import bbs.tool.*;
import com.opensymphony.xwork2.*;
public class BBSManagerAdd extends ActionSupport {
private Integer managerID;
private String username;
private String password;
private String competence;
private String activestatus;
private String validation;
public Integer getManagerID() {
  return managerID;
}
public void setManagerID(Integer managerID) {
  this.managerID = managerID;
}
public String getUsername() {
  return username;
}
public void setUsername(String username) {
  this.username = username;
}
public String getPassword() {
  return password;
}
public void setPassword(String password) {
  MD5 md5=new MD5();
  this.password = md5.getMD5ofStr(password);
}
public String getCompetence() {
  return competence;
}
public void setCompetence(String competence) {
  this.competence = competence;
}
public String getActivestatus() {
  return activestatus;
}
public void setActivestatus(String activestatus) {
  this.activestatus = activestatus;
}
public String getValidation() {
  return validation;
}
public void setValidation(String validation) {
  this.validation = validation;
}
public String execute(){
  Map session=ActionContext.getContext().getSession();
  String sysValidation=(String)session.get("sysValidation");
  if(sysValidation.equals(validation)){
   BBSManagerDAO bmd=new BBSManagerDAO();
   BBSManager manager=new BBSManager();
   manager.setUsername(username);
   manager.setPassword(password);
   try{
    competence=competence.replaceAll(" ", "");
   }catch(Exception e){
    competence="";
   }
   manager.setCompetence(competence);
   Integer active=Integer.parseInt(activestatus);
   manager.setActivestatus(active);
   bmd.add(manager);
   return SUCCESS;
  }else{
   return INPUT;
  }
}

}