Java开发网 - 求助：有关jsp的问题

Topic: 求助：有关jsp的问题

1.求助：有关jsp的问题

Posted by: chenchao100
Posted on: 2006-07-11 21:50

我写了个jsp程序，可是执行不了，不知道是什么原因，也找不出错误，请高手帮帮忙啊！程序是这样的：
<%@page contentType="text/html;charset=GB2312"%>
<html>
<body>
<body bgcolor=cyan><font size=4>
<p>请输入圆的半径：
<form action="" method=get name=form>
<input type="text" name="cat" value="1">
<input Type="submit" name="送出" value=submit></form>
<%!
public class Circle
{
double r;
Circle (double r)
{
this.r=r;
}
double mianji
{
return Math.PI*2*r;
}
double zhouchang
{
return Math.PI*2*r;

}
}
%>
<%
String str=request.getParameter("cat");
double r;
if(str!=null)
{
r=Double.parseDouble(str);
}
else
{
r=1;
}
Circle circle=new Circle(r);
%>
<p>圆的半径是：
<br>
<%=circle.mianji()%>
<p>圆的周长是：
<br>
<%=circle.zhouchang()%>
</font>

</body>
</html>

可是执行后的对话框为内容为：

HTTP Status 500 -

--------------------------------------------------------------------------------

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: Unable to compile class for JSP

An error occurred at line: 9 in the jsp file: /2_4.jsp
Generated servlet error:
Syntax error, insert ";" to complete FieldDeclaration

An error occurred at line: 9 in the jsp file: /2_4.jsp
Generated servlet error:
Void methods cannot return a value

An error occurred at line: 9 in the jsp file: /2_4.jsp
Generated servlet error:
Syntax error, insert ";" to complete FieldDeclaration

An error occurred at line: 9 in the jsp file: /2_4.jsp
Generated servlet error:
Void methods cannot return a value

An error occurred at line: 43 in the jsp file: /2_4.jsp
Generated servlet error:
The method mianji() is undefined for the type _2_005f4_jsp.Circle

An error occurred at line: 46 in the jsp file: /2_4.jsp
Generated servlet error:
The method zhouchang() is undefined for the type _2_005f4_jsp.Circle

  org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
  org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:328)
  org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:397)
  org.apache.jasper.compiler.Compiler.compile(Compiler.java:288)
  org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
  org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
  org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:556)
  org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:293)
  org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
  org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
  javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note The full stack trace of the root cause is available in the Apache Tomcat/5.5.9 logs.

--------------------------------------------------------------------------------

Apache Tomcat/5.5.9

2.Re:求助：有关jsp的问题 [Re: chenchao100]	Copy to clipboard
Posted by: InTheTerRan Posted on: 2006-07-15 14:46 double mianji { return Math.PI2r; } double zhouchang { return Math.PI2r; } 函数申明怎么没有() ? 应该double mianji() double zhouchang()