Create VerifyCode by jsp of java

자바 로 VerifyCode 생 성
VerifyCode.jsp

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@ page contentType="image/jpeg" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" pageEncoding="UTF-8" %>
<%!
Color getRandColor(int fc,int bc){
		//          
        Random random = new Random();
        if(fc>255) fc=255;
        if(bc>255) bc=255;
        int r=fc+random.nextInt(bc-fc);
        int g=fc+random.nextInt(bc-fc);
        int b=fc+random.nextInt(bc-fc);
        return new Color(r,g,b);
        }
%>
<%
try
{
//       
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);

out.println("01 _  verifyCode has created!!!");

String verifyCode = "9657";//(String)request.getSession().getAttribute(SessionConstant.LOGIN_USER_VERIFYCODE);
//End Modify 

//         
int width=60, height=20;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

//        
Graphics g = image.getGraphics();

//     
Random random = new Random();

//      
g.setColor(getRandColor(200,250));
g.fillRect(0, 0, width, height);

//    
g.setFont(new Font("Times New Roman",Font.PLAIN,18));

//   
//g.setColor(new Color());
//g.drawRect(0,0,width-1,height-1);


//     155    ，                  
g.setColor(getRandColor(160,200));
for (int i=0;i<155;i++)
{
	int x = random.nextInt(width);
	int y = random.nextInt(height);
	int xl = random.nextInt(12);
	int yl = random.nextInt(12);
	g.drawLine(x,y,x+xl,y+yl);
}


String num = "";
for (int i=0;i<4;i++){
    num = verifyCode.substring(i, i+1);
    //           
    g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));//           ，          ，        
    g.drawString(num,13*i+6,16);
}

//     
g.dispose();
//        
ServletOutputStream os = response.getOutputStream();
ImageIO.write(image, "JPEG", os);
out.println("verifyCode has created!!!");
//                  IllegalStateException
os.flush(); 
os.close(); 
os=null; 
response.flushBuffer(); 
out.clear(); 
out = pageContext.pushBody();
}
catch(Exception ex)
{
	out.println("Exception:" + ex.toString());
}

%>

호출 방법: VerifyCode 를 호출 해 야 하 는 페이지 에서 < image src = "VerifyCode. jsp" / > 를 사용 하면 됩 니 다.

Create VerifyCode by jsp of java

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