二利用servlet生成简单的注册码

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Servlet Cache Web HTML

Java代码

<servlet-name>image</servlet-name>

<servlet-class >org.test.web.AuthImage</servlet- class >

</servlet>

<servlet-mapping>

<servlet-name>image</servlet-name>

<url-pattern>/authImage</url-pattern>

</servlet-mapping>

其servlet源代码:

Java代码

public class AuthImage extends HttpServlet

{

private static final String CONTENT_TYPE = “text/html; charset=gb2312″ ;

//设置字母的大小,大小

private Font mFont = new Font( “Times New Roman” , Font.PLAIN, 17 );

public void init() throws ServletException

{

super .init();

}

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);

}

public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException

{

response.setHeader(“Pragma” , “No-cache” );

response.setHeader(“Cache-Control” , “no-cache” );

response.setDateHeader(“Expires” , 0 );

//表明生成的响应是图片

response.setContentType(“image/jpeg” );

int width= 100 , height= 18 ;

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(1 , 1 , width- 1 , height- 1 );

g.setColor(new Color( 102 , 102 , 102 ));

g.drawRect(0 , 0 , width- 1 , height- 1 );

g.setFont(mFont);

g.setColor(getRandColor(160 , 200 ));

//画随机线

for ( int i= 0 ;i< 155 ;i++)

{

int x = random.nextInt(width - 1 );

int y = random.nextInt(height - 1 );

int xl = random.nextInt( 6 ) + 1 ;

int yl = random.nextInt( 12 ) + 1 ;

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

}

//从另一方向画随机线

for ( int i = 0 ;i < 70 ;i++)

{

int x = random.nextInt(width - 1 );

int y = random.nextInt(height - 1 );

int xl = random.nextInt( 12 ) + 1 ;

int yl = random.nextInt( 6 ) + 1 ;

g.drawLine(x,y,x - xl,y - yl);

}

//生成随机数,并将随机数字转换为字母

String sRand=“” ;

for ( int i= 0 ;i< 6 ;i++)

{

int itmp = random.nextInt( 26 ) + 65 ;

char ctmp = ( char )itmp;

sRand += String.valueOf(ctmp);

g.setColor(new Color( 20 +random.nextInt( 110 ), 20 +random.nextInt( 110 ), 20 +random.nextInt( 110 )));

g.drawString(String.valueOf(ctmp),15 *i+ 10 , 16 );

}

HttpSession session = request.getSession(true );

session.setAttribute(“rand” ,sRand);

g.dispose();

ImageIO.write(image, “JPEG” , response.getOutputStream());

}

public void destroy()

{

}

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用js实现密码强度验证 | Java/JSP中文乱码问题解决心

2009-01-09 22:55
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