help!解决思路
日期：2014-05-18 浏览次数：20721 次
help!!!!
<%@ page contentType= "text/html; charset=gb2312 " language= "java " import= "java.sql.* " errorPage= " " %>
<%@ page import= "java.awt.* " %>
<%@ page import= "java.io.* " %>
<%@ page import= "java.awt.image.* " %>
<%@ page import= "java.awt.geom.* " %>
<%@ page import= "com.sun.image.codec.jpeg.* " %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN " "http://www.w3.org/TR/html4/loose.dtd ">
<html>
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=gb2312 ">
<title> 无标题文档 </title>
</head>
<body>
<br> 观看旋转的椭圆
<form action= " " method= "post " name= "form ">
<input type= "submit " value= "观看 " name= "Submit " >
</form>
<%
String str=request.getParameter( "submit ");
if(str!=null)
{
response.setContentType( "image/jpeg ");
int width=260, height=260;
BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
g.setColor(Color.white);
g.fillRect(0, 0, width, height);
Graphics2D g_2d=(Graphics2D)g;
Ellipse2D ellipse=new Ellipse2D. Double (20,50,120,50);
g_2d.setColor(Color.blue);
AffineTransform trans=new AffineTransform();
for(int i=1;i <=24;i++)
{
trans.rotate(15.0*Math.PI/180,75,75);
g_2d.setTransform(trans);
g_2d.draw(ellipse);
}
g.dispose();
OutputStream outClient= response.getOutputStream();
JPEGImageEncoder encoder=JPEGCodec.createJPEGEncoder(outClient);
encoder.encode(image);
}
%>
</body>
</html>
原封不动的抄的 为什么看不到旋转的椭圆
------解决方案--------------------
<input type= "submit " value= "观看 " name= "Submit " >
Submit你是大写的
String str=request.getParameter( "submit ");
这里你是小写的。
改一下就行了
<%@ page contentType= "text/html; charset=gb2312 " language= "java " import= "java.sql.* " errorPage= " " %>
<%@ page import= "java.awt.* " %>
<%@ page import= "java.io.* " %>
<%@ page import= "java.awt.image.* " %>
<%@ page import= "java.awt.geom.* " %>
<%@ page import= "com.sun.image.codec.jpeg.* " %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN " "http://www.w3.org/TR/html4/loose.dtd ">
<html>
<head>
<meta http-equiv= "Content-Type " content= "text/html; charset=gb2312 ">
<title> 无标题文档 </title>
</head>
<body>
<br> 观看旋转的椭圆
<form action= " " method= "post " name= "form ">
<input type= "submit " value= "观看 " name= "Submit " >
</form>
<%
String str=request.getParameter( "submit ");
if(str!=null)
{
response.setContentType( "image/jpeg ");
int width=260, height=260;
BufferedImage image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
Graphics g = image.getGraphics();
g.setColor(Color.white);
g.fillRect(0, 0, width, height);
Graphics2D g_2d=(Graphics2D)g;
Ellipse2D ellipse=new Ellipse2D. Double (20,50,120,50);
g_2d.setColor(Color.blue);
AffineTransform trans=new AffineTransform();
for(int i=1;i <=24;i++)
{
trans.rotate(15.0*Math.PI/180,75,75);
g_2d.setTransform(trans);
g_2d.draw(ellipse);
}
g.dispose();
OutputStream outClient= response.getOutputStream();
JPEGImageEncoder encoder=JPEGCodec.createJPEGEncoder(outClient);
encoder.encode(image);
}
%>
</body>
</html>
原封不动的抄的 为什么看不到旋转的椭圆
------解决方案--------------------
<input type= "submit " value= "观看 " name= "Submit " >
Submit你是大写的
String str=request.getParameter( "submit ");
这里你是小写的。
改一下就行了
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