JSP新手，要求帮助，十分感谢

2012-09-01 01:12:56 125 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

Servlet与JSP-JavaWeb项目食用指南本项目是基于Servlet+JSP+DataBase实现的一个商品管理系统，主要目的是学习JavaWeb入门的知识：Servlet、JSP以及EL表达式、Ajax和JSON。完成这个项目主要还是巩固练习JavaWeb的基础知识，为后面的JavaEE框架的学习做铺垫。所以以本人的学习经验来看，这是一个很好的上手Web的练习项目阅读详情

刚开始学习JSP，照书上编写第一个JSP小程，结果就运行不成功。请大家帮助看看，是什么原因？路过各位大侠，多谢了！
<%@ page import= "java.util.* " %>
<%@ page import= "java.math.* " %>
<%@ page import= "java.lang.* " %>
<htmL>
<head><title>MY first JSP</title></head>
<body>
<%! int angles[]={0,30,45,75,90};%>
<TABLE BORDER="2" ALIGN="center">
<th>angel</th><th>sine of angle</th>
<%for(int i=0;i<5;i++)%>
<tr><td><%=angles[i]%></td>
<td><%=Math.sin(Math.toRadians(angles[i]))%></td>
</tr>
</table>
</body>
</html>
上面是代码，下面是浏览器页面上的错误提示：
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: 11 in the jsp file: /1.jsp
i cannot be resolved to a variable
8: <TABLE BORDER="2" ALIGN="center">
9: <th>angel</th><th>sine of angle</th>
10: <%for(int i=0;i<5;i++)%>
11: <tr><td><%=angles[i]%></td>
12: <td><%=Math.sin(Math.toRadians(angles[i]))%></td>
13: </tr>
14: </table>

An error occurred at line: 12 in the jsp file: /1.jsp
i cannot be resolved to a variable
9: <th>angel</th><th>sine of angle</th>
10: <%for(int i=0;i<5;i++)%>
11: <tr><td><%=angles[i]%></td>
12: <td><%=Math.sin(Math.toRadians(angles[i]))%></td>
13: </tr>
14: </table>
15: </body>

Stacktrace:
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:102)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:331)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:457)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:378)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:353)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:340)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:646)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:357)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

note The full stack trace of the root cause is available in the Apache Tomcat/7.0.23 logs.

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