Random. jsp file code:
<% @ Page autoflush = "false" Import = "Java. AWT. *, java. AWT. image. *, com.sun.image.codec.jpeg. *, java. util. *" %>
<% @ Page import = "org. Apache. commons. Lang. randomstringutils" %>
<%
Randomstringutils rs = new randomstringutils ();
String random = Rs. randomalphanumeric (4 );
Session. setattribute ("random", random );
%>
<%
Out. Clear ();
Response. setcontenttype ("image/JPEG ");
Response. addheader ("Pragma", "No-Cache ");
Response. addheader ("cache-control", "No-Cache ");
Response. adddateheader ("expries", 0 );
Int width = 100, Height = 40;
Bufferedimage image = new bufferedimage (width, height, bufferedimage. type_int_rgb );
Graphics G = image. getgraphics ();
// Fill in the following background? Color
G. setcolor (color. Gray );
Font defont = new font ("sansserif", Font. Plain, 32 );
G. setfont (defont );
G. fillrect (0, 0, width, height );
//? Font? Color
G. setcolor (color. Red );
G. drawstring (random, 3,30 );
G. Dispose ();
Servletoutputstream outstream = response. getoutputstream ();
Required imageencoder encoder = required codec. createjpegencoder (outstream );
Encoder. encode (image );
Outstream. Close ();
%>
The code for the test. jsp file is as follows:
<% @ Page contenttype = "text/html; charset = UTF-8" Language = "Java" Import = "Java. SQL. *" errorpage = "" %>
<HTML>
<Head>
<Title> untitled document </title>
<Meta http-equiv = "Content-Type" content = "text/html; charset = gb2312">
</Head>
<Body>
</Body>
</Html>
If you do not want to import Apache packages, compile the following file by yourself.
// Frontend plus GUI for Jad
// Decompiled: randomstringutils. Class
Package org. Apache. commons. Lang;
Import java. util. Random;
Public class randomstringutils
{
Private Static final random = new random ();
Public randomstringutils ()
{
}
Public static string random (INT count)
{
Return random (count, false, false );
}
Public static string randomascii (INT count)
{
Return random (count, 32,127, false, false );
}
Public static string randomalphabetic (INT count)
{
Return random (count, true, false );
}
Public static string randomalphanumeric (INT count)
{
Return random (count, true, true );
}
Public static string randomnumeric (INT count)
{
Return random (count, false, true );
}
Public static string random (INT count, Boolean letters, Boolean numbers)
{
Return random (count, 0, 0, letters, numbers );
}
Public static string random (INT count, int start, int end, Boolean letters, Boolean numbers)
{
Return random (count, start, end, letters, numbers, null );
}
Public static string random (INT count, int start, int end, Boolean letters, Boolean numbers, char set [])
{
If (START = 0 & End = 0)
{
End = 122;
Start = 32;
If (! Letters &&! Numbers)
{
Start = 0;
End = 0x7fffffff;
}
}
Stringbuffer buffer = new stringbuffer ();
Int Gap = end-start;
While (count --! = 0)
{
Char ch;
If (set = NULL)
Ch = (char) (random. nextint (GAP) + start );
Else
Ch = set [random. nextint (GAP) + start];
If (letters & numbers & character. isletterordigit (CH) | Letters & character. isletter (CH) | numbers & character. isdigit (CH) |! Letters &&! Numbers)
Buffer. append (CH );
Else
Count ++;
}
Return buffer. tostring ();
}
Public static string random (INT count, string set)
{
Return random (count, set. tochararray ());
}
Public static string random (INT count, char set [])
{
Return random (count, 0, set. Length-1, false, false, set );
}
}
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