JSP Chinese Verification Code

<% @ Page pageEncoding = "gb2312" contentType = "image/jpeg" import = "javax. imageio. *, java. util. *, java. awt. image. *, java. awt. * "%>
<%!
// Obtain and generate a random color here
Color getRandColor (Random random, int ff, int cc ){
'If (ff> 255)
Ff = 255;
If (HTTP> 255)
Cc = 255;
Int r = ff + random. nextInt (cc-ff );
Int g = ff + random. nextInt (cc-ff );
Int B = ff + random. nextInt (cc-ff );
Return new Color (r, g, B );
} %>
<%
// Set no cache for the JSP page here
Response. setHeader ("Pragma", "No-cache ");
Response. setHeader ("Cache-Control", "no-cache ");
Response. setDateHeader ("Expires", 0 );
// Set the length and width of the image
Int width = 130;
Int height = 30;
// Set the randomly selected Chinese text. The text content here is too many and is not listed one by one, just for example.
String base = "\ u9752 \ u534a \ u706b \ u6cd5 \ signature \ u5efa \ signature \ u5531 \ signature \ u5973 \ signature \ u4ef6 \ u611f \ u51c6 \ u97f3 \ u7b54 \ u54e5 \ u9645 \ u65e7 \ u795e \ u5ea7 \ u7ae0 \ u538b \ u6162 \ u53d4 \ u80cc \ u7ec6 ";
// Set the number of alternative random Chinese Characters
Int length = base. length ();
// Create a cache Image
BufferedImage image = new BufferedImage (width, height, BufferedImage. TYPE_INT_RGB );
// Obtain the image object
Graphics g = image. getGraphics ();
// Create a random function
Random random = new Random ();
// Set the background color of the image
G. setColor (getRandColor (random, 188,235 ));
G. fillRect (0, 0, width, height );
// Set the random alternative font type
String [] fontTypes = {"\ u5b8b \ u4f53", "\ u65b0 \ u5b8b \ u4f53 ",
"\ U9ed1 \ u4f53", "\ u6977 \ u4f53", "\ u96b6 \ u4e66 "};
Int fontTypesLength = fontTypes. length;
// Add noise on the image background to increase the difficulty of Image Analysis
G. setColor (getRandColor (random, 180,199 ));
G. setFont (new Font ("Times New Roman", Font. PLAIN, 14 ));
For (int I = 0; I <4; I ++ ){
G. drawString ("@*@*@*@*@*@*@*",
0, 5 * (I + 2 ));
}
// Obtain the randomly generated Verification Code (4 Chinese characters)
// Save the Generated Chinese character string
String sRand = "";
For (int I = 0; I <4; I ++ ){
Int start = random. nextInt (length );
String rand = base. substring (start, start + 1 );
SRand + = rand;
// Set the font color of the image.
G. setColor (getRandColor (random, 10,150 ));
// Set the font format
G. setFont (new Font (fontTypes [random. nextInt (fontTypesLength)],
Font. BOLD, 18 + random. nextInt (6 )));
// Draw the Chinese character on the verification Image
G. drawString (rand, 24 * I + 10 + random. nextInt (8), 24 );
}
// Save the verification code to S ession
Session. setAttribute ("rand", sRand );
G. dispose ();
// Output the image to the JSP page
ImageIO. write (image, "JPEG", response. getOutputStream ());
// Close the stream
Out. clear ();
Out = pageContext. pushBody ();
%>
<% @ Page pageEncoding = "gb2312" contentType = "image/jpeg" import = "javax. imageio. *, java. util. *, java. awt. image. *, java. awt. * "%>
<%!
// Obtain and generate a random color here
Color getRandColor (Random random, int ff, int cc ){
'If (ff> 255)
Ff = 255;
If (HTTP> 255)
Cc = 255;
Int r = ff + random. nextInt (cc-ff );
Int g = ff + random. nextInt (cc-ff );
Int B = ff + random. nextInt (cc-ff );
Return new Color (r, g, B );
} %>
<%
// Set no cache for the JSP page here
Response. setHeader ("Pragma", "No-cache ");
Response. setHeader ("Cache-Control", "no-cache ");
Response. setDateHeader ("Expires", 0 );
// Set the length and width of the image to www.2cto.com.
Int width = 130;
Int height = 30;
// Set the randomly selected Chinese text. The text content here is too many and is not listed one by one, just for example.
String base = "\ u9752 \ u534a \ u706b \ u6cd5 \ signature \ u5efa \ signature \ u5531 \ signature \ u5973 \ signature \ u4ef6 \ u611f \ u51c6 \ u97f3 \ u7b54 \ u54e5 \ u9645 \ u65e7 \ u795e \ u5ea7 \ u7ae0 \ u538b \ u6162 \ u53d4 \ u80cc \ u7ec6 ";
// Set the number of alternative random Chinese Characters
Int length = base. length ();
// Create a cache Image
BufferedImage image = new BufferedImage (width, height, BufferedImage. TYPE_INT_RGB );
// Obtain the image object
Graphics g = image. getGraphics ();
// Create a random function
Random random = new Random ();
// Set the background color of the image
G. setColor (getRandColor (random, 188,235 ));
G. fillRect (0, 0, width, height );
// Set the random alternative font type
String [] fontTypes = {"\ u5b8b \ u4f53", "\ u65b0 \ u5b8b \ u4f53 ",
"\ U9ed1 \ u4f53", "\ u6977 \ u4f53", "\ u96b6 \ u4e66 "};
Int fontTypesLength = fontTypes. length;
// Add noise on the image background to increase the difficulty of Image Analysis
G. setColor (getRandColor (random, 180,199 ));
G. setFont (new Font ("Times New Roman", Font. PLAIN, 14 ));
For (int I = 0; I <4; I ++ ){
G. drawString ("@*@*@*@*@*@*@*",
0, 5 * (I + 2 ));
}
// Obtain the randomly generated Verification Code (4 Chinese characters)
// Save the Generated Chinese character string
String sRand = "";
For (int I = 0; I <4; I ++ ){
Int start = random. nextInt (length );
String rand = base. substring (start, start + 1 );
SRand + = rand;
// Set the font color of the image.
G. setColor (getRandColor (random, 10,150 ));
// Set the font format
G. setFont (new Font (fontTypes [random. nextInt (fontTypesLength)],
Font. BOLD, 18 + random. nextInt (6 )));
// Draw the Chinese character on the verification Image
G. drawString (rand, 24 * I + 10 + random. nextInt (8), 24 );
}
// Save the verification code to S ession
Session. setAttribute ("rand", sRand );
G. dispose ();
// Output the image to the JSP page
ImageIO. write (image, "JPEG", response. getOutputStream ());
// Close the stream
Out. clear ();
Out = pageContext. pushBody ();
%>

 

 

 

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