이미지 생성 (이미지에 글자 입력)
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<%@ page
import  = "com.mgame.mgcrypt"
import  = "java.io.*"
import  = "java.awt.*"
import  = "java.awt.image.*"
import  = "java.util.Random"
import  = "javax.imageio.*"
%><%
mgcrypt obj = new mgcrypt();

String txt = "";
try {
        txt        = (request.getParameter("viewString")).trim();
        txt        = (obj.setDecrypt(txt, 2000)).trim();
} catch(NullPointerException e) {
}

// 이미지 생성
int w = 202, h = 73;
BufferedImage image = new BufferedImage( w, h, BufferedImage.TYPE_INT_RGB );
Graphics2D g2 = image.createGraphics();

// 스트로크 생성
BasicStroke stoke1 = new BasicStroke(1.0f);
BasicStroke stoke2 = new BasicStroke(2.0f);
BasicStroke stoke3 = new BasicStroke(3.0f);

// 배경 생성
int inc = 205;
int x = 0;
for(int i=0;i<50;i++) {
        g2.setColor( new Color(inc+i,inc+i,inc+i) );
        g2.fillRect( x, 0, x+4, h );
        x += 4;
}

// 라인 생성
Random r = new Random();
g2.setColor( Color.lightGray );
int x1 = r.nextInt(197)+5;
int y1 = r.nextInt(68)+5;
for(int i=0;i<5;i++) {
        int x2 = r.nextInt(197)+5;
        int y2 = r.nextInt(68)+5;

        int st = r.nextInt(4)+1;
        if(st == 1) {
                g2.setStroke(stoke3);
        } else if(st == 2) {
                g2.setStroke(stoke2);
        } else {
                g2.setStroke(stoke1);
        }

        g2.drawLine( x1, y1, x2, y2 );
        x1 = x2; y1 = y2;
}

// 박스 생성
g2.setStroke(stoke2);
g2.setColor( Color.black );
g2.drawRect( 1, 1, w-2, h-2 );

// 텍스트 생성 - 1:+, 2:-, 3:>, 4:< (부등호는 무조건 왼쪽이 답)
String img_txt = "";
if(!txt.equals("") && txt != null) {
        String temp_txt1 = "";
        String temp_txt2 = txt.substring(4, 5);

        if(temp_txt2.equals("1")) {
                temp_txt1 = "과 ";
                temp_txt2 = "를 더한 수는?";
        } else if(temp_txt2.equals("2")) {
                temp_txt1 = "에서 ";
                temp_txt2 = "를 뺀 수는?";
        } else if(temp_txt2.equals("3")) {
                temp_txt1 = "과 ";
                temp_txt2 = "중 큰 수는?";
        } else if(temp_txt2.equals("4")) {
                temp_txt1 = "과 ";
                temp_txt2 = "중 작은 수는?";
        } else {
                temp_txt2 = "Error";
        }

        if(!temp_txt1.equals("")) {
                img_txt = txt.substring(0, 2) + temp_txt1 + txt.substring(2, 4) + temp_txt2;
                img_txt = new String(img_txt.getBytes("8859_1"),"euc-kr");
        } else {
                img_txt = temp_txt2;
        }
}

// BatangChe, DotumChe, GulimChe, GungsuhChe, Serif, SansSerif, Monospaced, Dialog, Dialog Input
g2.setColor( Color.black );
g2.setFont(new Font("DotumChe",Font.BOLD,17));
g2.drawString(img_txt, 8, 44 );

// png 가 훨 깨끗함.
response.setContentType("image/png");                                // jpg 로 바꿀때 image/png -> image/jpeg
OutputStream dest = response.getOutputStream();
ImageIO.write( image, "png", dest );                                // jpg 로 바꿀때 png -> jpg
dest.flush();
dest.close();
%>