最近写jsp遇到一系列的低级错误，记录下来权当前车之鉴吧。

错误提示：

SEVERE: Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: /jsp04/Zj04_sj_test1_1.jsp(2,1) Page directive must not have multiple occurrences of pageencoding

程序代码如下：

 <%@ page language="java" import="java.util.*" pageEncoding="gbk"%>

 <%@ page language="java" import="jsp04.*" pageEncoding="gbk"%>

  <%@ page import="javax.servlet.jsp.jstl.sql.Result;"%>

 <%

 String path = request.getContextPath();

 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

 %>

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

 <html>

   <head>

     <base href="<%=basePath%>">

     <title>民意调查</title>

     <meta http-equiv="pragma" content="no-cache">

     <meta http-equiv="cache-control" content="no-cache">

     <meta http-equiv="expires" content="0">

     <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

     <meta http-equiv="description" content="This is my page">

     <!--

     <link rel="stylesheet" type="text/css" href="styles.css">

     -->

   </head>

   <body>

    <br>

     在校大学生是否适合做兼职 <br>

    <br>

    <%

    //构造sql语句，取出调查

    String sql="select * from surveyItem where surveyID=1";

    Object params[]={};

    //获取调查项列表

    Result result=DBHelp.runSelectSql(sql,params);

    Map[] rows=result.getRows();

    //循环访问每一个调查项

    for(int i=0;i<rows.length;i++){

        //得到调查项目的ID

        int id=Integer.parseInt(rows[i].get("id").toString());

        //得到调查项

        String item=rows[i].get("item").toString();

    %>

     <input type="radio" name="radsurver" value="<%=id %>"><%=item %>

    <%

    }

    %><br>

     <input type="submie" name="Submit" value="提交">

     <input type="reset" name="Submit2" value="重置">

   </body>

 </html>
首先，org.apache.jasper.JasperException 中的JasperException
这个异常时jsp引擎解析jsp页面生成servlet时产生的，故错误是在转译阶段，应该是页面的语法有问题，而不是执行阶段出错
然后，检查一下配置，发现页面编码设置了两次，虽然是一样的编码，但还是不被允许的
最后，第二行改为：
　　
<%@ page import="jsp04.*" %>

OK  ！

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