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Jquery asynchronously calls post and get (important)

Source: Internet
Author: User
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SetJquery-1.7.2.js In the webroot directoryIn the scripts folder (ScriptsIs a self-created folder)

Place dom4j-1.6.1.jar under webroot/WEB-INF/lib


1. Compile the servlet: xmlservlet

Package com. xuankai. servlet;

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;

Import org. dom4j. Document;
Import org. dom4j. documenthelper;
Import org. dom4j. element;
Import org. dom4j. Io. outputformat;
Import org. dom4j. Io. xmlwriter;


// The following line imports another person class, containing the ID, name, age, and address attributes, and generates their get and set methods. (Code omitted)
Import com. xuankai. model. person;


Public class xmlservlet extends httpservlet
{
@ Override
Protected void dopost (httpservletrequest req, httpservletresponse resp)
Throws servletexception, ioexception
{
String name = Req. getparameter ("name ");

Person = new person ();

If ("zhangsan". Equals (name ))
{
Person. setid (1 );
Person. setname ("zhangsan ");
Person. setage (20 );
Person. setaddress ("Beijing ");
}
Else
{
Person. setid (2 );
Person. setname ("Lisi ");
Person. setage (25 );
Person. setaddress ("Tianjing ");
}

// Use dom4j to create XML

Document document = incluenthelper. createdocument ();

Element rootelement = Document. addelement ("users ");

Rootelement. addcomment ("this is comment! ");

Element userelement = rootelement. addelement ("user ");

Element idelement = userelement. addelement ("ID ");
Element nameelement = userelement. addelement ("name ");
Element ageelement = userelement. addelement ("Age ");
Element addresselement = userelement. addelement ("Address ");

Idelement. settext (person. GETID () + "");
Nameelement. settext (person. getname ());
Ageelement. settext (person. getage () + "");
Addresselement. settext (person. getaddress ());

Resp. setcontenttype ("text/XML; charset = UTF-8 ");
Resp. setheader ("Pragma", "No-Cache ");
Resp. setheader ("cache-control", "No-Cache ");

Printwriter out = resp. getwriter ();

// Set the output format

Outputformat format = outputformat. createprettyprint ();


// Set the encoding format

Format. setencoding ("UTF-8 ");

Xmlwriter = new xmlwriter (Out, format );

Xmlwriter. Write (document );

Out. Flush ();


}

@ Override
Protected void doget (httpservletrequest req, httpservletresponse resp)
Throws servletexception, ioexception
{
This. dopost (req, resp );
}
}

2. Compile JSP: XML. jsp

<% @ Page Language = "Java" Import = "Java. util. *" pageencoding = "UTF-8" %>
<HTML>
<Head>

<Title> my JSP 'xml. jsp 'starting page </title>

<SCRIPT type = "text/JavaScript" src = "scripts/jquery-1.7.2.js"> </SCRIPT>
<SCRIPT type = "text/JavaScript">
$ (Function (){


// Use method: $. Ajax () to do it !!
/*
$ ("# Button"). Click (function (){


$. Ajax ({

Type: "Post ",
URL: "xmlservlet ",
Datatype: "XML ",
Data: {Name: $ ("# name"). Val ()},
Success: function (returneddata ){

VaR id = $ (returneddata). Find ("ID"). Text ();
VaR name = $ (returneddata). Find ("name"). Text ();
VaR age = $ (returneddata). Find ("Age"). Text ();
VaR address = $ (returneddata). Find ("Address"). Text ();

VaR html = "<Table width = '000000' border = '1' align = 'center'> <tr> <TH> id </Th> <TH> name </Th> <TH> age </Th> <TH> address </Th> </tr> <TD> "+ ID +" </TD> <TD>" + name + "</TD> <TD>" + age + "</TD> <TD>" + address + "</TD> <tr> ";

$ ("# Body table: eq (0)"). Remove ();
$ ("# Body"). append (HTML );
}


});

});
*/

// Use method: $. Get () or $. Post () to do it !!

$ (Function (){

$ ("# Button"). Click (function (){

$. Get ("xmlservlet", {Name: $ ("# name"). Val ()},
Function (returneddata, status ){
VaR id = $ (returneddata). Find ("ID"). Text ();
VaR name = $ (returneddata). Find ("name"). Text ();
VaR age = $ (returneddata). Find ("Age"). Text ();
VaR address = $ (returneddata). Find ("Address"). Text ();

VaR html = "<Table width = '000000' border = '1' align = 'center'> <tr> <TH> id </Th> <TH> name </Th> <TH> age </Th> <TH> address </Th> </tr> <TD> "+ ID +" </TD> <TD>" + name + "</TD> <TD>" + age + "</TD> <TD>" + address + "</TD> <tr> ";

$ ("# Body table: eq (0)"). Remove ();
$ ("# Body"). append (HTML );
}
);
});
});
});


</SCRIPT>

</Head>

<Body id = "body">

<Select id = "name">
<Option value = "zhangsan"> zhangsan </option>
<Option value = "Lisi"> Lisi </option>
</SELECT>

<Input type = "button" value = "get content from server" id = "button">

</Body>
</Html>


The running result is:

The result of selecting zhangsan from the drop-down menu is:

When Lisi is selected from the drop-down menu, the result is:

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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