servlet验证码生成.docVIP

package servlet.soft03.qtc; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.io.IOException; import java.io.OutputStream; import java.util.Random; import javax.imageio.ImageIO; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class validateServlet extends HttpServlet { /** * The doGet method of the servlet. br * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred * * */ private static String chars=avsdkjiew.@R%12460yery; private static Color getRundomColor(int maxColor,int minColor){ if(maxColor255){ maxColor=255; } if(minColor255){ minColor=255; } Random r=new Random(); int red=minColor+r.nextInt(maxColor-minColor); int green=minColor+r.nextInt(maxColor-minColor); int blue=minColor+r.nextInt(maxColor-minColor); return new Color(red,green,blue); } protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { int height=20; int width=150; BufferedImage image=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB); Graphics g=image.getGraphics(); g.setColor(getRundomColor(150,120)); g.fillRect(0, 0, width, height+10); g.setColor(getRundomColor(150,100)); g.setFont(new Font(Times New Roman,Font.ITALIC,height)); Random ra=new Random(); StringBuffer string=new StringBuffer(); int length=chars.length(); for(int i=0;i5;i++){ char a=chars.charAt(ra.nextInt(length)); string.append(a); g.setColor(getRundomColor(50,10));