总共分为三组代码 circle.jsp用于显示 Circle.java 用于定义类 radiusInput用于输入circle.jsp如下<%@ page language="java" import="circle.class" contentType="text/html;charset=GBK" pageEncoding="ISO-8859-1" session="True"%><jsp:useBean id="circleBean" scope="page" class="circle.Circle" type="java.lang.String" ></jsp:useBean></p><html><body><%int radius=Integer.parseInt(request.getParameter("radius"));circleBean.setRadius(radius);out.println("圆的半径是:"+circleBean.getRadius());out.println("圆的周长是:"+circleBean.getLength());out.println("圆的面积是:"+circleBean.getArea());%></body></html>我用的是Tomcat6.0已经把circle.class类放在了C:\Program Files\Apache Software Foundation\Tomcat 6.0\webapps\ROOT\WEB-INF\classes下 运行错误：org.apache.jasper.JasperException: /circle.jsp(2,0) The value for the useBean class attribute circle.Circle is invalid.org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:40)org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:407)org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:148)org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1272)org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1178)org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2361).........java程序如下：package circle;public class Circle{private int radius=1;public Circle(){}public int getRadius(){return radius;}public void setRadius(int rRadius){radius=rRadius;}public double circleLength(){return Math.PI*radius*2.0;}public double circleArea(){return Math.PI*radius*radius;}}radiusInput的jsp页面可以正确运行 代码我略去了。。。输入半径的代码我也发了吧：<body><form id="form1" name="form1" method="post" action="circle.jsp">请输入圆的半径:<input name="radius" type="text" id="radius"/><input type="submit" name="submit" value="开始计算"/></form></body>
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收到一只叮咚
TA贡献1821条经验 获得超4个赞
你好，我发现是这块出问题了，你也可以试试楼上的。
<%@ page language="java" import="circle.class" contentType="text/html;charset=GBK" pageEncoding="ISO-8859-1" session="True"%>
修改成下面的：
<%@ page language="java" import="circle.Circle" contentType="text/html;charset=GBK" pageEncoding="ISO-8859-1" session="True"%>
慕神8447489
TA贡献1780条经验 获得超1个赞
你好，
<jsp:useBean id="circleBean" scope="page" class="circle.Circle" type="java.lang.String" ></jsp:useBean>这里，把type="java.lang.String"删掉
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