BlogJava-xwgong-文章分类-jsphttp://www.blogjava.net/g710246442/category/54442.html向javaEE前进zh-cnWed, 23 Jul 2014 14:45:11 GMTWed, 23 Jul 2014 14:45:11 GMT60frameset框架如何在session过期后跳入到顶层页面http://www.blogjava.net/g710246442/articles/401355.html龚小伟龚小伟Tue, 09 Jul 2013 03:43:00 GMThttp://www.blogjava.net/g710246442/articles/401355.htmlhttp://www.blogjava.net/g710246442/comments/401355.htmlhttp://www.blogjava.net/g710246442/articles/401355.html#Feedback0http://www.blogjava.net/g710246442/comments/commentRss/401355.htmlhttp://www.blogjava.net/g710246442/services/trackbacks/401355.html
转自:http://martinwu.blog.163.com/blog/static/2147211482013324111017321/
frameset框架如何在session过期后跳入到顶层页面

例如：在Java Web开发中后台管理系统用的frameset作为框架来展现整个后台的操作功能，但是现在我们利用servlet的过滤器来控制所有页面的session是否过期，如果过期则需要跳入到顶层的登录页面

往往在完成这个操作的时候有一定问题我们需要解决，即：当出现session过期后，登录页面会在当前的frame子

框架中显示。这样子非常不好。

简单的解决方法：在登录页面中的JavaScript中加入一个判断

<script type="text/javascript">
	if (top.location != self.location){ 
		top.location=self.location; 
	}
</script>


龚小伟 2013-07-09 11:43 发表评论
]]>无刷新更换页面验证码http://www.blogjava.net/g710246442/articles/394650.html龚小伟龚小伟Wed, 23 Jan 2013 07:16:00 GMThttp://www.blogjava.net/g710246442/articles/394650.htmlhttp://www.blogjava.net/g710246442/comments/394650.htmlhttp://www.blogjava.net/g710246442/articles/394650.html#Feedback0http://www.blogjava.net/g710246442/comments/commentRss/394650.htmlhttp://www.blogjava.net/g710246442/services/trackbacks/394650.html<img src=“路径.jsp或者action或者servlet” id=“img”/>
<a href="#" onclick="refresh()">看不清？</a>
//js代码
<script type="text/javascript">
function refresh(){
    document.getElementById("img").src="路径.jsp？参数="+Math.random（）;
}
</script>

//验证码生成页面
<%@ page  import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" %>  
<%@ page import="java.io.OutputStream" %>  
<%!  
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);  
}  
%>  
<%  
try{  
response.setHeader("Pragma","No-cache");  
response.setHeader("Cache-Control","no-cache");  
response.setDateHeader("Expires", 0);  
String codelist = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz1234567890";
int width=60, height=20;  
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);  
OutputStream os=response.getOutputStream();  
Graphics g = image.getGraphics();  
Random random = new Random();  
g.setColor(getRandColor(200,250));  
g.fillRect(0, 0, width, height);  
 
g.setFont(new Font("Times New Roman",Font.PLAIN,18));  
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);  
}
String sRand="";  
for (int i=0;i<4;i++){  
 int rand=random.nextInt(codelist.length());
    String strRand=codelist.substring(rand,rand+1);
    sRand+=strRand;  
g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));  
g.drawString(strRand,13*i+6,16);
}
session.setAttribute("rand",sRand);  
g.dispose();  
 
ImageIO.write(image, "JPEG",os);  
 
os.flush();  
os.close();  
os=null;  
response.flushBuffer();  
out.clear();  
out = pageContext.pushBody();  
}  
catch(IllegalStateException e)  
{  
System.out.println(e.getMessage());  
e.printStackTrace();  
}%> 

龚小伟 2013-01-23 15:16 发表评论
]]>