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Javaweb--Use the session to prevent the form from repeating the submission (episode)

repeat the submission.1.3: After the user clicks the Submit button, click the "Back button" of the browser to fall back to the submission page of the form page and submit again.The demo animation looks like this:Ii. using JavaScript to prevent forms from repeating submissionsSince there is the above-mentioned form of duplicate submission problem, then we have to

Javaweb Learning Summary (i)--use the session to prevent the form from repeating the submission

userName = Request.getparameter ("U Sername "); try {17//To allow the current thread to sleep for 3 seconds, simulating a network delay causing the form to repeat the behavior of Thread.Sleep (3*1000); 19} catch (Interruptedexception e) {e.printstacktrace ();}22 System.out.println ("Insert data into database:" + UserName);}24 public void DoPost (HttpServletRequest request, httpservletresponse response) THR oWS Servletexception, Ioexception {doget (request, response); 28}29 30} If you do not rep

Example of PHP preventing duplicate submission of forms

One of the limitations we can't ignore when we submit a form is to prevent users from repeatedly submitting the form, because it's possible that the user clicks the Submit button consecutively or that the attacker maliciously submits the data, so we get into trouble when we commit the data, such as modifying or adding data to the database. So how to circumvent the repeated submission of the form in this phenomenon? We can start from a number of aspec

hadoop2.x Yarn Job Submission (client)

The client submitting the yarn job still uses the Runjar class, and MR1, as can be referenced http://blog.csdn.net/lihm0_1/article/details/13629375 In the 1.x is submitted to the Jobtracker, and in 2.x replaced by ResourceManager, the client's proxy object also changed, replaced by Yarnrunner, but the approximate process and 1 similar, the main process focused on jobsubmitter.submitjobinternal , including checking output directory legality, setting up job su

hadoop2.x Yarn Job Submission (service side)

When RM receives a client job submission request, it responds via RPC server, in which case the client submits the job through the Applicationclientprotocol RPC client, and the client's submission process is shown in the previous article, in the submission phase of the Code, Getnewapplication is invoked first to obtain a getnewapplicationresponse that contains th

How to handle carriage return submission form by different browsers _javascript tips

Conditions are: under IE and Firefox 1, 2, there is a type= "submit" of "input". under the Chrome and Safari Meet the first one. (Note 1) Therefore, if you want to control the submission of the behavior (for example, before submitting check required to fill in), you can type= "submit" after "input" add JavaScript "OnXXX (such as onclick)" event. It is not valid if you need to use asynchronous interaction to detect related fields. Because return fa

Dmoz.org's website selection standard-DMOZ column

Here are guidelines for joining a specific website. These guidelines will help ensure that resources added to the ODP will meet the objectives of the directory.   sites that should be included The ODP has two objectives: to build the most

Input submit, button and enter key submission data detailed _ Basic tutorial

Submitted in this manner, when the input value is 22222222, the URL submitted later becomes localhost:3980/input.html?name=222222Some of the notable details include: When you set the Type=submit, the input control becomes a button with the text displayed as its value and the default value is submit.Form[method] The default is get, so the page jump is done using the gets method after submission.Input[type] The default value is text, so the first input is displayed as a text box. Input is actual

Ajax (c) Ajax submission form, AJAX implementation file upload

Type one: Use the Targer property of the From form + hidden iframe to achieve similar results, supporting the submission of complex forms containing files and common dataWay two: Use jquery's. Ajax (..), which supports the submission of regular forms, but does not support complex forms containing files; Ajax ({...}), which supports the submission of regular forms

DWZ (JUI) Tutorial general form submission

Recently some friends asked some regular form submission problems, I do some simple comb here, DWZ here form submission can be divided into two categories One is the normal form submission, the other is the list page form submission, mainly used to query the search list. Today I will briefly introduce the former. This

Hihocoder Question Bank 1051 Supplementary submission F card

Topics Time limit: 2000ms single point time limit: 1000ms memory limit: 256MB description Little Ho set himself a grand goal: 100 days in a row, insist on submitting a program on Hihocoder every day. 100 days later, Little Ho view their submission records found that there were n days because fun forgot to submit. So little Ho Ruanmoyingpao, to suppress the small hi despise the eyes from the young hi there to M Zhang "fill the card." Each "fill-in card

How to avoid duplicate submission of forms

Repeat | Repeat submit have you ever encountered a "repeat submission" problem? It is not difficult to solve the problem. Here's a simple way to avoid duplicate submissions of the same form. First, we can define a session variable to hold the submit sequence number of a form. Here I define "$userLastAction". Then add a hidden variable to the form and set the value to $userlastaction+1: Finally, determine if the form has been submitted before processin

Restricting duplicate submission of the same form in an ASP application

Program | repeat | Repeat submit | On the Internet we encounter countless forms every day, and most of them do not restrict users from submitting the same form multiple times. The lack of such restrictions can sometimes produce unexpected results, such as repeating a subscription to a mail service or repeating a ballot. Perhaps some ASP beginners are not clear how to limit the repeated submission of the same form in ASP applications, so here we introd

Jquery.form.js implement the method of submitting form submission to Ajax way _jquery

The example in this article describes the Jquery.form.js implementation method of submitting form submission to Ajax. Share to everyone for your reference. The specific analysis is as follows: This framework sets form to submit, verify, and upload functions.This framework must be combined with the full jquery version, otherwise the Min will not work.Principle: Using JS to assemble the form into Ajax URL and data, the principle or use Ajax to submit,

hihoCoder1051-Supplementary Submission card

Title: http://hihocoder.com/problemset/problem/1051 Description Small Ho set himself a grand goal: 100 days in a row to insist on the hihocoder on a daily basis to submit a program. 100 days passed, small Ho view of his submission record found that there are n days because fun forgot to submit. So small ho Ruanmoyingpao, endure little hi despise eyes from small hi there to come to M Zhang "submit card." Each "Supplementary

How PHP judges client IP to prevent duplicate submission of forms

The example of this paper is to analyze the way that PHP prevents form recurrence by recording IP. Share to everyone for your reference. The specific analysis is as follows: This principle is relatively simple is the first time the user submitted when we record the user's IP address, that way, if the user submits the form again within a fixed time, it prompts for a repeat submission, which is often used to support the application at the top, which is

Ext.Ajax.request and Formpanel.getform (). Submit () The similarities and differences between the two submission methods:

Ext.Ajax.request and Formpanel.getform (). Submit () The similarities and differences between the two submission methods:1, the same point:A) is the use of asynchronous submission method;b) The default is to use the Post method to submit data;2, different points:A) The request method cannot use the Waitmsg property to set the information that is displayed while waiting for a response, which is available whe

MyEclipse in the SVN update submission synchronization repository detailed explanation of their function

The principle is that the SVN server is generally placed on the public server, we even this server, myeclipse on the use of SVN control can download the project on the SVN to the local, so many companies will develop to use the software is put on SVN, a colleague to just connect the SVN You can get the things you need down.1.update UpdateUpdate, refers to the changes on the server and you do not change locally, you need to update ,2.commit SubmissionCommit, refers to the server does not have, th

HTML--the difference between get and post submission methods--

In the process of writing code, get and post are two different ways of committing. Below, the two different ways are listed.Method/Step Get is the data that is fetched from the server, and post is the data that is sent to the server. Get is the URL where the parameter data queue is added to the Action property of the submission form, and the value corresponds to the field one by one in the form, which is visible in the URL. Post is the HTTP post

Jquery.form.js Ajax Submission Upload file

Project recently useful to form submission, is with the image upload form input, the need for Ajax asynchronous submission, online to find a lot of examples are only to submit the upload field a message, here to tidy up a bit. There are plain text information fields in the form as well as image upload fields.1. JSP code--Introduce jquery and jquery.form.js method= "POST" action= "" enctype= "Multipart/form-

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