MyException - 我的异常网
当前位置:我的异常网» Java Web开发 » javabean调用的有关问题

javabean调用的有关问题

www.MyException.Cn  网友分享于:2013-12-22  浏览:5次
javabean调用的问题
javabean的程序如下:
package   datastructure;
import   java.awt.*;
import   java.awt.image.*;
import   java.io.*;
import   javax.imageio.*;
import   javax.servlet.*;
import   javax.servlet.http.*;
public   class   C1  
{
private   int   pictureWidth=400;
        private   int   pictureHeight=400;
public   void   draw(HttpServletResponse   response)
{
response.reset();
response.setContentType( "image/png ");
BufferedImage   image=new   BufferedImage(pictureWidth,pictureHeight,BufferedImage.TYPE_INT_RGB);
Graphics2D   g2d=image.createGraphics();
g2d.setPaint(Color.YELLOW);  
                g2d.fillRect(0,   0,   pictureWidth,   pictureHeight);  
                g2d.dispose();
                ServletOutputStream   sos=null;
                try  
                {
                sos=response.getOutputStream();
                        ImageIO.write(image, "PNG ",sos);
                        sos.close();
                }  
                catch   (IOException   ex)   {
                }
}
}

jsp的程序如下:
<%@   page   language= "java "   contentType= "text/html;charset=gb2312 "%>
<jsp:useBean   id= "make "   class= "datastructure.C1 "   scope= "application "/>
<html>
<%
String   k1=request.getParameter( "k1 ");
String   k2=request.getParameter( "k2 ");
String   k3=request.getParameter( "k3 ");
%>
<head>
<meta   http-equiv= "Content-Type "   content= "text/html;charset=gb2312 ">
</head>
<body   bgcolor= "#FFCCFF ">
<%
if(k3!=null)   make.draw(response);
else
{
    out.println( " <div   align= 'center '> ");
    out.println( " <br> <br> <br> <br> <br> <br> <br> <br> <br> ");
    out.println( " <font   size= '12 '   color= '#0033CC '> <b> 数据结构在线演示 </b> </font> ");
    out.println( " </div> ");
}
%>
</body>
</html>

有没有办法在上面的javabean中取得jsp中的k1和k2的?

------解决方案--------------------
public void draw(HttpServletResponse response,String k1,String k2)
{
response.reset();
response.setContentType( "image/png ");
BufferedImage image=new BufferedImage(pictureWidth,pictureHeight,BufferedImage.TYPE_INT_RGB);
Graphics2D g2d=image.createGraphics();
g2d.setPaint(Color.YELLOW);
g2d.fillRect(0, 0, pictureWidth, pictureHeight);
g2d.dispose();
ServletOutputStream sos=null;
try

文章评论

软件开发程序错误异常ExceptionCopyright © 2009-2015 MyException 版权所有