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Java源代碼BC

我自己做的,在系統裏作為驗證碼的JSP。

& lt% @頁content type = " image/JPEG;charset = utf-8 " % & gt;

& lt%@page import="java.util.*,java.awt.*,java.awt.image.*,javax.imageio. * " % & gt

& lt% @ page import = " Java . io . output stream " % & gt;

& lthtml & gt

& ltbody & gt

& lt%!

Color getRandColor(int fc,int bc)

{

Random rd = new Random();

if(fc & gt;255)fc = 255;

if(BC & gt;255)BC = 255;

int red = fc+rd . nextint(BC-fc);

int green = fc+rd . nextint(BC-fc);

int blue = fc+rd . nextint(BC-fc);

返回新顏色(紅、綠、藍);

}

% & gt

& lt%

Random r = new Random();

response.addHeader("Pragma ","無緩存");

response . add header(" Cache-Control "," no-Cache ");

response . adddate header(" expires ",0);

int width = 90

int height = 23

BufferedImage pic = new buffered image(寬度,高度,buffered image。TYPE _ INT _ RGB);

graphics GC = pic . get graphics();

gc.setColor(getRandColor(200,250));

gc.fillRect(0,0,width,height);

String[] rNum ={"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”,“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”};

int[] style = {Font。普通字體。粗體,字體。斜體,字體。素色+字體。大膽,

字體。粗體+字體。斜體,字體。素色+字體。斜體,字體。素色+字體。粗體+字體。斜體};

gc.setColor(顏色。白色);

gc.drawLine(0,30,90,10);

GC . set color(getRandColor(160,200));

for(int I = 0;我& lt50;i++)

{

int x = r.nextInt(寬度);

int y = r . nextint(height);

int XL = r . nextint(10);

int yl = r . nextint(10);

gc.drawLine(x,y,x+xl,y+yl);

}

gc.setColor(getRandColor(60,150));

字符串rt =

for(int I = 0;我& lt4;i++){

string temp = rNum[r . nextint(62)];

rt = rt+temp;

GC . set Font(New Font(" Times New Roman ",style[r.nextInt(7)],15));

gc.drawString(temp,5+I * 15+r . nextint(10),10+r . nextint(10));

}

GC . dispose();

session.setAttribute("randNum ",rt);

output stream OS = response . get output stream();

ImageIO.write(pic,“JPEG”,OS);

System.out.println("當前驗證碼為:"+session . get attribute(" rand num "));

OS . flush();

OS . close();

os = null

response . flush buffer();

out . clear();

out = pagecontext . push body();

% & gt

& lt/body & gt;

& lt/html & gt;

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