java data validation

First, the necessity of forms validation:Form validation on both the client and server side, client authentication is actually a direct call to the JavaScript script to verify the data entered by the user, and the server can also achieve data validation, but when the server pressure is too large, the resource loss will

So easy~--whFirst, what is the data check?This is a good understanding, is used to verify that the customer input data is legitimate, such as customer login, user name can not be empty, or can not exceed the specified length and other requirements, this is called data validation.The data check is divided into the clien

Microsoft Windows Presentation Foundation (WPF) has a rich data-binding system. In addition to being a key driver for loosely coupling UI definitions from support logic and data through the Model-view-viewmodel (MVVM) model, the data-binding system provides strong and flexible support for business data

The rules for executable validation areNotempty cannot be emptyNumber can only be an integerIsemail Mailbox address is correctWhether the Hasone is unique (duplicates, whether it already exists)Regex Custom Regular expression The format of the validation isArray (validation method, field name for validation, prompt fo

Source of demand:In the daily work, business process is often a lot of continuous data flow, processing, presentation process, in this process, the inevitable is the work of data validation. Data validation work is a tedious repetition of labor, there is no technical content

transferred to the server after the client's verification. We first verify that the user name is not empty, how to do it?To get the idea right, we can do it in 3 steps:1. Declare a custom attribute.2. Add a custom attribute to the user class.3, through the characteristics of the data to achieve the verification.Declares a custom attribute.1 [AttributeUsage (attributetargets.property)]2 classRequiredattribute:attribute3 {4 /// 5

length of 5 -Maxlength3:Ten, toCheckchartype: [true,false,false,NULL] + }, - "X.sex":{//input box that needs to be validated name theRequiredtrue,//verification Condition: Required *Minlength2:5,//validation Condition: Minimum length of 5 $Maxlength2:TenPanax Notoginseng }, - }, the messages:{ + "X.name":{ ARequired:"cannot be empty", theMinLength:"the minimum value is 5" + }, -

So easy~--whFirst, what is the data check?This is a good understanding, is used to verify that the customer input data is legitimate, such as customer login, user name can not be empty, or can not exceed the specified length and other requirements, this is called data validation.The data check is divided into the clien

Data validation includes server-side validation and client-side validation, and the implementation of data validation in the MVC database is described in this article. The client's unit vali