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This article shows you how to log in in the local refresh application of Ajax. The content is concise and easy to understand, which will definitely brighten your eyes. I hope you can get something through the detailed introduction of this article.

Don't say a word, just give it to the code. I believe all you need is code rather than a pile of nonsense.

1.java Code:

The code is as follows:

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 ("")

If (name.equals ("yangjinde")) {

Out.println ("+" Sorry, the name 'yangjinde' is already registered "+")

} else {

Out.println ("+" can register with "+")

}

Out.println ("")

Out.close ()

}

}

2.jsp Code:

The copy code is as follows:

My JSP 'index.jsp' starting page

/ / set a variable

Var XMLHttpReq=false

/ / create a 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 request function

Function send (url) {

CreateXMLHttpRequest ()

XMLHttpReq.open ("GET", url,true)

XMLHttpReq.onreadystatechange=proce; / / specify the function of the response

XMLHttpReq.send (null); / / send request

}

Function proce () {

If (XMLHttpReq.readyState==4) {/ / object status

If (XMLHttpReq.status==200) {/ / the information has been returned successfully. Start processing the information.

Var res=XMLHttpReq.responseXML.getElementsByTagName ("content") [0] .firstChild.data

Window.alert (res)

Document.getElementById ("data") [xss_clean] = 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 ("Please enter content")

Return false

}

Else {

Send ('login?name='+name)

}

}

Name:

I will change later!

3.xml profile Code:

The code is as follows:

Login

Tt.TestA

Login

/ login

Index.jsp

The above content is how to simply login in the Ajax local refresh application. Have you learned the knowledge or skills? If you want to learn more skills or enrich your knowledge reserve, you are welcome to follow the industry information channel.

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