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 ();
The following fill 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 ();
JPEGImageEncoder encoder =jpegcodec.createjpegencoder (OutStream);
Encoder.encode (image);
Outstream.close ();
%>
The test.jsp file code is as follows:
<%@ page contenttype= "text/html; Charset=utf-8 "language=" java "import=" java.sql.* "errorpage=" "%>"
<title>untitled document</title>
<meta http-equiv= "Content-type" content= "text/html; charset=gb2312 ">
<body>
</body>
If you don't want to import Apache packages, you can compile the following file 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 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, 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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