JSP第四周

<%@page import="com.sun.xml.internal.ws.util.StringUtils"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>


<%
    String name = request.getParameter("address");
    String pwd = request.getParameter("password");
  

    if (null != name&&null!=pwd) {
         /*  out.println("请输入账号密码");
        }  else{
             if(null!=incode&&null!=rightcode){
                 out.println("请输入验证码");
              }else{
                   if(incode.equals(rightcode)) {
                           //      out.println("验证码输入正确！");   */  
                          if (name.equals("zs") && pwd.equals("123")) {
                                     pageContext.forward("login.jsp");
                              }else {
                                      out.println("您输入的账号或密码有误，请重新输入！");
                              }
                 /*   }else{  
                             out.println("验证码输入不正确，请重新输入！");  
                    }         */
       
          //    } 
        }
%>

 <%  
    String incode = (String)request.getParameter("code");   
    String rightcode = (String)session.getAttribute("rCode");
      
    if(incode != null && rightcode != null){  
        if(incode.equals(rightcode)){  
            out.println("验证码输入正确！");  
        }else{  
            out.println("验证码输入不正确，请重新输入！");  
        }  
    }  
  %>  
<html>
<head>
</head>
<body style="background:url(image/why.png);">
<form action="index.jsp" method="post">
    账号： 
    <input type="text" name="address" size="20"><br>
    密码： 
    <input type="password" name="password" size="20"><br>
    验证码： 
    <input type="text" name="code" size="10"> 
    <img  src="num.jsp" width="60px" height="40px" />换一张<br>
     <input type="submit" value="登录" name="login"  >
</form>
</body>

</html>

<%@ page contentType="image/jpeg" language="java" import="java.util.*,java.awt.*,java.awt.image.*,javax.imageio.*" pageEncoding="utf-8"%>  
  
<%!  
    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);  
    }  
%>  
  
<%   
    //设置页面不缓存  
    response.setHeader("Pragma","no-cache");  
    response.setHeader("Cache-Control","no-catch");  
    response.setDateHeader("Expires",0);  
      
    //在内存中创建图象  
    int width = 60;  
    int height = 20;  
    BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);  
      
    //创建图象  
    Graphics g = image.getGraphics();  
    //生成随机对象  
    Random random = new Random();  
    //设置背景色  
    g.setColor(getRandColor(200,250));  
    g.fillRect(0,0,width,height);  
    //设置字体  
    g.setFont(new Font("Tines Nev Roman",Font.PLAIN,18));  
    //随机产生干扰线  
    g.setColor(getRandColor(160,200));  
    for(int i = 0; i < 255; i++){  
        int x = random.nextInt(width);  
        int y = random.nextInt(height);  
        int xl = random.nextInt(12);  
        int yl = random.nextInt(12);  
    }  
    //随机产生认证码,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)));  
        g.drawString(rand,13*i+6,16);  
    }  
    session.setAttribute("rCode",sRand);  
    //图像生效  
    g.dispose();  
    //输出图像到页面  
    ImageIO.write(image,"JPEG",response.getOutputStream());  
    out.clear();  
    out = pageContext.pushBody();  
%>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
  <head>
    
  </head>
  
  <body style="background:url(image/why.png)">
   <h1> 欢迎登录</h1>
</body>
</html>