JavaBean有关问题

2013-09-11

JavaBean问题?javaBeanimportjava.io.*publicclassCircle{intradiuspublicCircle(){radius1}publici

JavaBean问题?
javaBean==
import java.io.*;
public class Circle
{
int radius;
public Circle()
{
radius=1;
}
public int getRadius()
{
return radius;
}
public void setRadius(int newRadius)
{
radius=newRadius;
}
public double circleArea()
{
return Math.PI*radius*radius;
}
public double circleLength()
{
return 2.0*Math.PI*radius;
}
}
======
<%@ page contentType= "text/html;charset=GB2312 "%>
<%@ page import= "Circle "%>

<html>
<body bgcolor= "cyan "> 
<jsp:useBean id= "girl " class= "Circle " scope= "page "/>
<%//设置园的半径
girl.setRadius(100);
%>
 圆的半径是：
<%=girl.getRadius()%>
 圆的周长是：
<%=girl.circleLength()%>
 圆的面积是：
<%=girl.circleArea()%>
</body>
</html>
-=-=-=-=-=-=-=-=
org.apache.jasper.JasperException: Unable to compile class for JSP

Generated servlet error:
E:\Tomcat 5.0\work\Catalina\localhost\tow\org\apache\jsp\useBeans_jsp.java:6: '. ' expected
import Circle;
^
1 error
我好几个地方都碰到了,请问怎么回事?

[解决办法]
<%@ page contentType= "text/html;charset=GB2312 "%>
<%@ page import= "csdn002.Circle "%>
<html>
<body bgcolor= "cyan ">

<jsp:useBean id= "girl " class= "Circle " scope= "page "/>
<%//设置园的半径
girl.setRadius(100);
%>
 圆的半径是：
<%=girl.getRadius()%>
 圆的周长是：
<%=girl.circleLength()%>
 圆的面积是：
<%=girl.circleArea()%>

</body>
</html>
[解决办法]
<%@ page import= "csdn002.Circle "%>
加上包名
[解决办法]
把你的BEAN加个包名试试.
[解决办法]
好像JSP用到的javaBean需要加包名

试试如下
package test;
import java.io.*;
public class Circle
{
int radius;
public Circle()
{
radius=1;
}
public int getRadius()
{
return radius;
}
public void setRadius(int newRadius)
{
radius=newRadius;
}
public double circleArea()
{
return Math.PI*radius*radius;
}
public double circleLength()
{
return 2.0*Math.PI*radius;
}
}
======
<%@ page contentType= "text/html;charset=GB2312 "%>
<%@ page import= "test.Circle "%>

<html>
<body bgcolor= "cyan "> 
<jsp:useBean id= "girl " class= "Circle " scope= "page "/>
<%//设置园的半径
girl.setRadius(100);
%>
 圆的半径是：
<%=girl.getRadius()%>

圆的周长是：
<%=girl.circleLength()%>
 圆的面积是：
<%=girl.circleArea()%>
</body>
</html>

[解决办法]
=========JSP页面代码应为
<%@ page contentType= "text/html;charset=GB2312 "%>
<%@ page import= "test.Circle "%>

<html>
<body bgcolor= "cyan "> 
<jsp:useBean id= "girl " class= "test.Circle " scope= "page "/>
<%//设置园的半径
girl.setRadius(100);
%>
 圆的半径是：
<%=girl.getRadius()%>
 圆的周长是：
<%=girl.circleLength()%>
 圆的面积是：
<%=girl.circleArea()%>
</body>
</html>

[解决办法]
其中 <%@ page import= "test.Circle "%> 这行可以去掉
[解决办法]
每看出有什么错误,会不会是环境的配置问题
[解决办法]
要加上package
我的异常网推荐解决方案：org.apache.jasper.JasperException: Unable to compile class,http://www.myexception.cn/j2ee/2308.html

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