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Partial Ajax refresh-simple logon example

Source: Internet
Author: User
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If you don't want to talk about it, just give it to the code. I believe all you need is code instead of a bunch of crap ...... 1. Java code:

Package tt;

Import java. Io. ioexception;
Import java. Io. printwriter;

Import javax. servlet. servletexception;
Import javax. servlet. http. httpservlet;
Import javax. servlet. http. httpservletrequest;
Import javax. servlet. http. httpservletresponse;

Public class Testa extends httpservlet {

Private Static final long serialversionuid =-7999241892841130740l;

Protected void doget (httpservletrequest request,
Httpservletresponse response) throws servletexception, ioexception {
Request. setcharacterencoding ("UTF-8 ");
String name = request. getparameter ("name ");

Response. setcontenttype ("text/XML; charset = UTF-8 ");
Response. setheader ("cache-control", "No-Cache ");
Printwriter out = response. getwriter ();
Out. println ("<pront> ");
If (name. Equals ("yangjinde ")){
Out. println ("<content>" + "sorry, 'yangjinde' has been registered" + "</content> ");
} Else {
Out. println ("<content>" + "can be registered" + "</content> ");
}
Out. println ("</pront> ");
Out. Close ();
}

}

2. JSP code:

<% @ Page Language = "Java" Import = "Java. util. *" pageencoding = "UTF-8" %>
<%
String Path = request. getcontextpath ();
String basepath = request. getscheme () + ": //" + request. getservername () + ":" + request. getserverport () + path + "/";
%>

<! Doctype HTML public "-// W3C // dtd html 4.01 transitional // en">
<HTML>
<Head>
<Base href = "<% = basepath %>">

<Title> my JSP 'index. jsp 'starting page </title>
<Meta http-equiv = "Pragma" content = "no-Cache">
<Meta http-equiv = "cache-control" content = "no-Cache">
<Meta http-equiv = "expires" content = "0">
<Meta http-equiv = "keywords" content = "keyword1, keyword2, keyword3">
<Meta http-equiv = "Description" content = "this is my page">
<SCRIPT>
// Set a variable
VaR xmlhttpreq = false;
// Create an XMLHTTPRequest object
Function createxmlhttprequest (){
If (window. XMLHttpRequest) {// Mozilla
Xmlhttpreq = new XMLHttpRequest ();
}
Else if (window. activexobject ){
Try {
Xmlhttpreq = new activexobject ("msxml2.xmlhttp ");
} Catch (e ){
Try {
Xmlhttpreq = new activexobject ("Microsoft. XMLHTTP ");
} Catch (e ){}
}
}
}
// Send the request Function
Function send (URL ){
Createxmlhttprequest ();
Xmlhttpreq. Open ("get", URL, true );
Xmlhttpreq. onreadystatechange = proce; // specify the Response Function
Xmlhttpreq. Send (null); // send the request
}
Function proce (){
If (xmlhttpreq. readystate = 4) {// object status
If (xmlhttpreq. Status = 200) {// The message is returned successfully. Start to process the information.
VaR res = xmlhttpreq. responsexml. getelementsbytagname ("content") [0]. firstchild. Data;
Window. Alert (RES );
Document. getelementbyid ("data"). innerhtml = res;
Document. getelementbyid ("name"). value = res;
} Else {
Window. Alert ("sorry, the requested page has an exception ");
}
}
}
// Authentication
Function check (){
VaR name = Document. getelementbyid ("name"). value;
If (name = ""){
Alert ("Enter the content ");
Return false;
}
Else {
Send ('login? Name = '+ name );
}
}

</SCRIPT>
</Head>

<Body>
<Form action = "login" method = "Post">
<Tr> <TD> name: <input id = "name" type = "text" name = "name"/>
<Input type = "button" value = "Click here to try" onclick = "check ()"/>
</TD>
</Tr>
<Tr> <TD> <Div id = "data"> I will change it later !! </Div> </TD> </tr>
</Form>
</Body>
</Html>

3. xml configuration file code:

<? XML version = "1.0" encoding = "UTF-8"?>
<Web-app version = "2.4"
Xmlns = "http://java.sun.com/xml/ns/j2ee"
Xmlns: xsi = "http://www.w3.org/2001/XMLSchema-instance"
Xsi: schemalocation = "http://java.sun.com/xml/ns/j2ee
Http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd>
<Servlet>
<Servlet-Name> login </servlet-Name>
<Servlet-class> TT. Testa </servlet-class>
</Servlet>

<Servlet-mapping>
<Servlet-Name> login </servlet-Name>
<URL-pattern>/login </url-pattern>
</Servlet-mapping>
<Welcome-file-List>
<Welcome-File> index. jsp </welcome-File>
</Welcome-file-List>
</Web-app>

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
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