How to write code to get verification code?

Question: How to write the code that shows the verification code in jsp? Import java.awt.color; Import java.awt.font; Import java.awt.graphics; Import java.awt.image.buffered image; Import java.io.ioexception; Import java.io.outputstream; Import java.util.random; Import javax.imageio.imageio; /* Generate verification code picture */Public class MakeCertPic {The character set that can appear in the verification code picture can be modified as needed. ] = {'a',' b',' c',' d',' e',' f',' g',' h',' I' and' j'. p '，' q '，' r '，' s '，' t '，' u '，' v '，' w '，' x '，' y '，' z '，' 0 '，' 1 '，' 2 '，' 3 '，' 4 '，' 5 '，' 6 '，' 7 '，' 8 '，' 9 ' }； /* function: generate color verification code picture parameter wedth is the width of generated picture, parameter height is the height of generated picture, and parameter os is the output stream of page */public string getcertpic (int width, int height, output stream OS) {if (width >).

Question 2: How to write the html of verification code JS to generate verification code? code { background-image:URL(code . jpg)； Font family: Arial font style: italic; Color: red; Border: 0; Fill: 2px 3px letter spacing: 3px font thickness: bold; }. unchanged {border: 0; } var code; Define the captcha function createcode () {code =; Var code length = 6; The length of the verification code var checkcode = document.getelementbyid (checkcode); var selectChar = new Array(0， 1，2，3，4，5，6，7，8，9，' A '，' B '，' C '，' D '，' E '，' F '，' G '，' H '，' I '，' J '，' K '，' L '，' M '，' N '，' O '， ' P '，' Q '，' R '，' S '，' T '，' U '，' V '，' W '，' X '，' Y '，' Z ')； Of course, all the characters that are candidates for verification codes can also be used in Chinese (var I = 0；; I>

Question 3: How to write the code that has obtained the mobile phone verification code according to the verification code?

Question php how to get the value of the verification code, and then how to write the verification code is generally saved in the session. Print the value of the session to view the fields and values corresponding to the verification code;

Dump ($ _ session);

Question 5: How to write verification code in html? Html can't write. You need a dynamic script to write, such as jsp, php, asp, aspx, c#, but the server needs to parse the script function to make a dynamic site. I don't know what language your website is in.

Please accept it, thank you!

Question 6: How to write the verification code? First, create a ValidateCode.aspx web page; Then at the bottom of your registration page: enter this code verification code: this code is to display the four-digit verification code on the registration page! Then enter the following code in the verification code class: Use System to use the system. Data; Use the system. Configuration; Use the system.

Question How to write java login verification code: 1. Random class is used to randomly generate four numbers. 2. Set the font format for these four numbers. 3. Change the font color with setColor and randomly generate the color code as follows: packages s1; Import java.awt.color; Import java.awt.font; Import java.awt.graphics; Import java.a

Question 8: How to register and obtain the verification code in the ios login interface can refer to the following example:

# # Create a new project

Now xcode's new projects have their own storyboards, which are not very convenient to operate. Let's speak and write code instead.

Open the AppDelegate.h file and add the following code.

-(BOOL)application:(ui application *)application diddfinishlaunchingwithoptions:(ns dictionary *)launch options { self . window =[[ui window alloc]initWithFrame:[[ui screen main screen]bounds]]； self . window . root view controller =[[view controller alloc]init]； [self . window makeKeyAndVisible]； Return YES}

This completes the first step of handwritten code.

Add input boxes and buttons

Add the following code to ViewController.h

# import ViewController.h

@interface ViewController()

@property (nonatomic，strong)UITextField * account；

@property (non-atomic, strong) UITextField * password

@property (nonatomic，strong)ui button * log in button；

@end

@ Implement View Controller

- (void)viewDidLoad {

[super viewdidload];

[self . view setbackground color:[ui color colorWithRed:5 1/255.0 green:204/255.0 blue:255/255.0 alpha: 1]]；

_ account =[[UITextField alloc]initWithFrame:CGRectMake(20，200，self.view.frame.size.width-40，50)]；

_ account . background color =[ui color white color]；

_ account . placeholder =[ns string string with format:@ Email]；

[self . view addSubview:_ account]；

_ password =[[UITextField alloc]initWithFrame:CGRectMake(20，260，self.view.frame.size.width-40，50)]；

_ password . background color =[ui color white color]；

_ Password . placeholder =[ns string string with format:@ Password]；

[self . view addSubview:_ password]；

_ log in button =[ui button button with type:uibuttontypearounderect]；

[_ log in button set frame:CGRectMake......& gt& gt

Question 9: You can get the verification code by inserting an input directly into the code of the button html. This input doesn't add any style, but only adds a definition of width and height at most.

I just tried it, and the width and height were not added.

Question 10: How to write the verification code in the webpage? You can look at the code generated by the verification code I quoted: create a new yanzhengma 1.aspx.cs file, and write the code: use the System to use the system. Collection; Use the system. Configuration; Use the system. Data; Use the system. Linq uses the system. Web usage system. Network security; Use the system. Web. UI uses the system. Web. UI.HtmlControls uses the system. Web. UI.WebControls uses the system. web . ui . web controls . web parts； Use the system. Xml. Linq uses the system. Drawing; Yan Zhengma, a public partial: system. Web.UI.Page {private system. IO.MemoryStream ms = newSystem。 IO . memory stream()； protected void Page _ Load(object sender，EventArgs e) { if(！ IsPostBack){ yanzhengmayzm = new yanzhengma()； Session [code 1] = yzm. CreateImage(5，ValidType。 Numerical value); }}//Type of verification code /public enum valid Type {// Numbers/values only,//Numbers and English characters /NumericAndEnglishChar,//Chinese characters /ChineseChar }// Generate random text pictures. Number of words saved in the session [code 1]// picture/generated text public string create image (int count, valid type type) {string valid code = gen code (count, type); Switch (Type)>& gt