Using the IFRAME implementation, click on the JSP page in the code refresh __jsp

This function mainly uses the JSP page to generate the verification code, realizes the page to refresh through the original javascript+iframe. The steps are as follows:

1. Verification Code Generation page valicode.jsp:

<%@ page language= "java" import= "java.util.*,java.io.*,com.sun.image.codec.jpeg.*,java.awt.*,java.awt.image.*" pageencoding= "GB18030"%>
<%
	String s= "";
	int count=0;
	Random rand=new Random ();
	Count=rand.nextint (9999);
	while (count<1000) {
		count=rand.nextint (9999);
	}
	S+=count;
	Session.setattribute ("Validate", s);
	Response.setcontenttype ("Image/gif");
	BufferedImage image=new BufferedImage (65,30,BUFFEREDIMAGE.TYPE_INT_RGB);
	Graphics gra=image.getgraphics ();
	Gra.setcolor (color.red);
	Gra.fillrect (1,1,63,28);
	Gra.setcolor (color.orange);
	Gra.setfont (New Font ("Official script", font.plain,28));
	char c;
	for (int i=0;i<4;i++) {
		C=s.charat (i);
		Gra.drawstring (c+ "", i*15+4,23);
	}
	OutputStream Toclient=response.getoutputstream ();
	JPEGImageEncoder Jpg=jpegcodec.createjpegencoder (toclient);
	Jpg.encode (image);
	Toclient.close ();
	Out.clear ();
	Out=pagecontext.pushbody ();
	
%>

2, set refresh page code.jsp:

The main introduction of the Verification code picture, click Refresh.

 

3, in the theme page index.jsp surface using IFRAME, the introduction of verification code

<iframe id= "MyFrame" width= "height=" src= "/company/code.jsp" scrolling= "no" ></iframe>


4, click can realize refresh. 


5, a more simple way, in the theme page index.jsp page can be directly using the OnClick implementation request Refresh

valicode.jsp' onclick= ' document.getElementById (' Imgvcode '). src = ' valicode.jsp? ' + (new Date ()). GetTime () "/>

Later time can change the address, the equivalent of a different request, the page to achieve the refresh effect.