Caching problem:
What is a caching problem? That is, when the browser's input is the same, that is, the requested URL is the same, so that the browser will read the cache, two of times, the same content, will not interact with the server side.
Workaround: Add a timestamp to the requested URL.
Through my test, IE, 3,602 times user name input is consistent and will not interact with the server side, Firefox, even if two user name input, will still interact with the server side.
That is: Firefox in the server side of the return of the temp value will be added 1,ie, 360 will not change. So plus timestamp in these three browsers will no longer have caching problems.
Modified code:
Ajaxserver.java
Caching problems
Copy Code code as follows:
Cache problem plus the test code input content unchanged IE, 360 times the number does not increase, Firefox will increase
Integer inte= (integer) request.getsession (). getattribute ("Total");
int temp=0;
if (inte==null) {
Temp=1;
}else{
Temp=inte.intvalue () +1;
}
Request.getsession (). setattribute ("Total", temp);
Add the above code to the Ajaxserver.java and return the TEMP variable to the client while out.println.
In this way, if the client's temp value is joined, it means that the client and server side are interacting, otherwise there is no.
Verify.js
Copy Code code as follows:
<!--cache problem, use time stamp to solve-->
Add timestamp to URL address, cheat browser, do not read cache
function Converturl (URL) {
Get time stamp
var timestamp= (new Date (). valueof ());
To stitch timestamp information to a URL
Url= "Ajaxserver"
if (Url.indexof ("?") >=0) {
url=url+ "&t=" +TIMESTAMP;
}else{
url=url+ "t=" +TIMESTAMP;
}
return URL;
}
function Verifycache () {
var url= "ajaxserver?name=" +$ ("#username"). Val ();
Url=converturl (URL); Cache
$.get (url,null,function (data) {
$ ("#result"). HTML (data);
});
}
In order to illustrate the problem by simply asking for verification and introduction of caching issues, the verification method used is jquery encapsulation Ajax to receive server-side text data.
Also, don't forget to modify the method called in ajax.html, change the name to Verifycache in the script above ()
Chinese questions:
There are two ways to solve this problem:
First: The page end uses a encodeURI, server-side with string Name=new string (old.getbytes ("iso8859-1"), "UTF-8");
Chinese 1
Copy Code code as follows:
function verifychinese1{
var url= "Ajaxserver?name=" +encodeuri ($ ("#username"). Val ());
Url=converturl (URL); Cache
$.get (url,null,function (data) {
$ ("#result"). HTML (data);
});
", adding the above method to the Verify.js, while
String Name=new string (old.getbytes ("iso8859-1"), "UTF-8");
Add to the appropriate location in the Ajaxserver.java class. For example, put it behind the PrintWriter code.
Again, in the first way, don't forget to modify the method called in Ajax.html, the name changed to the verifychinese1 in the script above ()
The second type: page end uses two times encodeURI, server end uses string name= Urldecoder.decode (old, "UTF-8");
Chinese 2
Copy Code code as follows:
function Verifychinese2 () {
var url= "Ajaxserver?name=" +encodeuri (encodeURI ($ ("#username"). Val ());
Url=converturl (URL); Cache
$.get (url,null,function (data) {
$ ("#result"). HTML (data);
});
}
", adding the above method to the Verify.js, while
String name= urldecoder.decode (old, "UTF-8");
Add to the appropriate location in the Ajaxserver.java class. For example, put it behind the PrintWriter code.
Again, in the second way, don't forget to modify the method called in ajax.html, and change the name to Verifychinese2 in the script above ()
Need the source code can leave a message.
Through a few days of learning, Ajax dynamic verification of basic understanding, follow-up will be based on the situation to increase the corresponding content.
