Java开发网 - 这段程序哪里错了？('try' without 'catch' or 'finally')

Topic: 这段程序哪里错了？('try' without 'catch' or 'finally')

1.这段程序哪里错了？('try' without 'catch' or 'finally')

Posted by: yangxg_a
Posted on: 2005-11-27 13:59

下面这段程序哪里错了啊？


<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import="java.io.*" %>
<HTML>
<BODY BGCOLOR=cyan><FONT Size=4>
    <%!
      int number=0;
      File file=new File("count.txt");
      synchronized void countPeople()//计算访问次数的同步方法
      {
        if(!file.exists())
        {
          number++;
          try{
              file.createNewFile();
              FileOutputStream Out=new FileOutputStream("count.txt");
              DataOutputStream dataOut=new DataOutputStream(out);
              dataOut.writeInt(number);
              out.close();
              dataOut.close();
             }
          catch(IOException ee){}
        }
        else
        {
          try{
              FileInputStream in=new FileInputstream("count.txt");
              DataInputStream dataIn=new DataInputStream(in);
              number=dataIn.readInt();
              number++;
              in.close();
              dataIn.close();
              FileOutputStream out=new FileOutputStream("count.txt");
              DataOutputStream dataOut=new DataOutputStream(out);
              dataOut.writeInt(number);
              out.close();
              dataOut.close();
             }
         }
         catch(IOException ee){}
       }
     }
%>
<%
    countPeople();
%>
<P><P>您是第
  <%=number%>
      个访问本站的客户。
</FONT>
</BODY>
</HTML>

错误提示是：

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: 5 in the jsp file: /Example2_3.jsp
Generated servlet error:
E:\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\Example2_005f3_jsp.java:31: 'try' without 'catch' or 'finally'
try{
^

An error occurred at line: 5 in the jsp file: /Example2_3.jsp
Generated servlet error:
E:\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\Example2_005f3_jsp.java:45: 'catch' without 'try'
catch(IOException ee){}
^

Generated servlet error:
E:\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\Example2_005f3_jsp.java:49: 'class' or 'interface' expected
private static java.util.Vector _jspx_dependants;
^

Generated servlet error:
E:\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\Example2_005f3_jsp.java:51: 'class' or 'interface' expected
public java.util.List getDependants() {
^

Generated servlet error:
E:\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\Example2_005f3_jsp.java:111: 'class' or 'interface' expected
}
^

Generated servlet error:
E:\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\Example2_005f3_jsp.java:112: 'class' or 'interface' expected
^

Generated servlet error:
E:\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\Example2_005f3_jsp.java:8: org.apache.jsp.Example2_005f3_jsp should be declared abstract; it does not define getDependants() in org.apache.jsp.Example2_005f3_jsp
public final class Example2_005f3_jsp extends org.apache.jasper.runtime.HttpJspBase
^

An error occurred at line: 5 in the jsp file: /Example2_3.jsp
Generated servlet error:
E:\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\Example2_005f3_jsp.java:22: cannot resolve symbol
symbol : variable out
location: class org.apache.jsp.Example2_005f3_jsp
DataOutputStream dataOut=new DataOutputStream(out);
^

An error occurred at line: 5 in the jsp file: /Example2_3.jsp
Generated servlet error:
E:\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\Example2_005f3_jsp.java:24: cannot resolve symbol
symbol : variable out
location: class org.apache.jsp.Example2_005f3_jsp
out.close();
^

An error occurred at line: 5 in the jsp file: /Example2_3.jsp
Generated servlet error:
E:\Tomcat 5.0\work\Catalina\localhost\_\org\apache\jsp\Example2_005f3_jsp.java:32: cannot resolve symbol
symbol : class FileInputstream
location: class org.apache.jsp.Example2_005f3_jsp
FileInputStream in=new FileInputstream("count.txt");
^
10 errors

  org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
  org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:332)
  org.apache.jasper.compiler.Compiler.generateClass(Compiler.java:412)
  org.apache.jasper.compiler.Compiler.compile(Compiler.java:472)
  org.apache.jasper.compiler.Compiler.compile(Compiler.java:451)
  org.apache.jasper.compiler.Compiler.compile(Compiler.java:439)
  org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:511)
  org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:295)
  org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
  org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
  javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note The full stack trace of the root cause is available in the Apache Tomcat/5.0.28 logs.

2.Re:这段程序哪里错了？ [Re: yangxg_a]	Copy to clipboard
Posted by: yangxg_a Posted on: 2005-11-27 16:04 没人回答吗？自己顶。

3.Re:这段程序哪里错了？ [Re: yangxg_a]	Copy to clipboard
Posted by: yangxg_a Posted on: 2005-11-27 18:55 这个论坛怎么好像一点人气都没有啊？~~~~~~

4.Re:这段程序哪里错了？ [Re: yangxg_a]

Copy to clipboard

Posted by: why
Posted on: 2005-11-27 23:56


        else
        {
          try{
              FileInputStream in=new FileInputstream("count.txt");
              DataInputStream dataIn=new DataInputStream(in);
              number=dataIn.readInt();
              number++;
              in.close();
              dataIn.close();
              FileOutputStream out=new FileOutputStream("count.txt");
              DataOutputStream dataOut=new DataOutputStream(out);
              dataOut.writeInt(number);
              out.close();
              dataOut.close();
             }
         // } -- bogus }, please check carefully!
         catch(IOException ee){}
       }
     }

Please use [ code ] tag in the future.

5.Re:这段程序哪里错了？ [Re: yangxg_a]	Copy to clipboard
Posted by: why Posted on: 2005-11-28 00:04 yangxg_a wrote: 没人回答吗？自己顶。不到兩個小時便頂這種行為要不得如有再犯立即砍帖

6.Re:这段程序哪里错了？ [Re: why]	Copy to clipboard
Posted by: yangxg_a Posted on: 2005-11-28 09:53 why wrote: 不到兩個小時便頂這種行為要不得如有再犯立即砍帖呵呵，不好意思。我是急于解决这个问题，在线等的，见半天没人回复就急了。看来是我太粗心了，小弟才开始自学JSP，以后还要多多讨教。