ajax jsp无刷新验证码实例 -凯发k8网页登录

																
<%@ page contenttype="text/html; charset=gbk" language="java" 
																
import="java.sql.*" errorpage="" pageencoding="gbk"%>

<%

//set chinese char 

//cody by ;

//homepage:jiarry.126.com

request.setcharacterencoding("gbk");

response.setcharacterencoding("gbk");

response.setcontenttype("text/html; charset=gbk");

%>












																


ajax(无刷新及时提示)验证码实例！cody by jarry



<%

string num=request.getparameter("num");

string random=(string)session.getattribute("random");

string name=request.getparameter("name");

if(num!=null&&random!=null&&name!=null)

{

if(num.equals(random))

{  

out.println("
																
恭喜您，验证码输入成功，这里是提交结果页面，可以写入数据库了！ 
																

");

out.println("您的名字是：" name);

out.println("
");

out.println("您输入的是：" num);

out.println("验证码是：" random);

out.println("");

return;//javascript:history.go(-1)

}

}

%>




																
onsubmit="return validata(this);">

您的姓名： (为了更好地说明此例，特加姓名一项)


验 证 码： 
																
 
																




 









														

																
<%@ page contenttype="text/html; charset=gbk" language="java" 
																
import="java.sql.*" errorpage="" pageencoding="gbk"%>

<%

//set chinese char 

//cody by ;

//homepage:jiarry.126.com

request.setcharacterencoding("gbk");

response.setcharacterencoding("gbk");

response.setcontenttype("text/html; charset=gbk");

%>

<%

string num=request.getparameter("num");

string random=(string)session.getattribute("random");
																
if(num!=null&&random!=null)

{

if(!num.equals(random))

{

/*

out.println("");

out.println("");

//response.sendredirect("img.jsp");

*/

out.print("validate_failed:" random);

}

else

{

//out.println("
验证成功！");

out.print("validate_successful:" random);

}

}

%>
														

																
com.sun.image.codec.jpeg.*,java.util.*" %>]]>
																
<%@ page autoflush="false"  import="java.util.*,java.awt.*,
																
java.awt.image.*,com.sun.image.codec.jpeg.*,java.util.*" %>
																
<%

//set chinese char 

//cody by ;

//homepage:jiarry.126.com

request.setcharacterencoding("gbk");

response.setcharacterencoding("gbk");

response.setcontenttype("text/html; charset=gbk");

%>

<%

string chose="0123456789abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz";
																
char display[]={'0',' ','0',' ','0',' ','0'},ran[]={'0','0','0','0'},temp;
																
random rand=new random();
																
for(int i=0;i<4;i  )

{
																
temp=chose.charat(rand.nextint(chose.length()));
																
display[i*2]=temp;
																
ran[i]=temp;

}



string random=string.valueof(display);
																
session.setattribute("random",string.valueof(ran));

%>

<%
																
out.clear();

response.setcontenttype("image/jpeg");

response.addheader("pragma","no-cache");

response.addheader("cache-control","no-cache");

response.adddateheader("expries",0);

int width=80, height=30;

bufferedimage image = new bufferedimage(width, height, 
																
bufferedimage.type_int_rgb);

graphics g = image.getgraphics();

//以下填充背景颜色

g.setcolor(color.green);

g.fillrect(0, 0, width, height);

//设置字体颜色

g.setcolor(color.red);

font font=new font("arial",font.plain,20);

g.setfont(font);

//g.drawstring(random,5,14);

g.drawstring(random,5,20);

g.dispose();

servletoutputstream outstream = response.getoutputstream();

jpegimageencoder encoder =jpegcodec.createjpegencoder(outstream);

encoder.encode(image);

outstream.close();

%>
														

																
/* namespacing object */

var net=new object();



net.ready_state_uninitialized=0;

net.ready_state_loading=1;

net.ready_state_loaded=2;

net.ready_state_interactive=3;

net.ready_state_complete=4;

/*--- content loader object for cross-browser requests ---*/

net.contentloader=function(url,on_load,on_error,method,params,contenttype){

this.req=null;

this.on_load=on_load;

this.on_error=(on_error) ? on_error : this.defaulterror;

this.loadxmldoc(url,method,params,contenttype);

}

net.contentloader.prototype.loadxmldoc=function(url,method,params,contenttype){

if (!method)

{

method="get";

}

if (!contenttype && method=="post")

{

contenttype='application/x-www-form-urlencoded';

}

if (window.xmlhttprequest)

{

this.req=new xmlhttprequest();

}

else if (window.activexobject)

{

//add try catch;

try {

this.req = new activexobject("msxml2.xmlhttp");

}catch (e1){

try {

this.req = new activexobject("microsoft.xmlhttp");     

} catch (e2){

}

}

//

//this.req=new activexobject("microsoft.xmlhttp");

}

if (this.req)

{

try

{

var loader=this;

this.req.onreadystatechange=function()

{

net.contentloader.onreadystate.call(loader);

}

this.req.open(method,url,true);

if (contenttype)

{

this.req.setrequestheader('content-type', contenttype);

}

this.req.send(params);

}

catch (err)

{

this.on_error.call(this);

}

}

}

net.contentloader.onreadystate=function(){

var req=this.req;

var ready=req.readystate;

if (ready==net.ready_state_complete){

var httpstatus=req.status;

if (httpstatus==200 || httpstatus==0){

this.on_load.call(this);

}else{

this.on_error.call(this);

}

}

}

net.contentloader.prototype.defaulterror=function(){

alert("error fetching data!"

 "\n\nreadystate:" this.req.readystate

 "\nstatus: " this.req.status

 "\nheaders: " this.req.getallresponseheaders());

}