​

旁白

今天将html代码改为jsp文件时，遇到报错，错误很低级，但是很深刻，特此将从csdn中查到的解决方案共享出来。

正题

在myeclipse中编写代码如下：

q1.html：



<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <title>q1.html</title>

    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="this is my page">
    <meta http-equiv="content-type" content="text/html; charset=UTF-8">
    
    <!--<link rel="stylesheet" type="text/css" href="./styles.css">-->

  </head>
  
  <body>
  <FORM METHOD=POST ACTION="q2.jsp">
  请输入您的姓名：
  <INPUT TYPE=TEXT NAME="thename">
  <INPUT TYPE=SUBMIT VALUE="SUBMIT">
  </FORM>
  </body>
</html>


q2.jsp:



<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1" pageEncoding="GBK"%>
<%
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>My JSP 'q2.jsp' starting page</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>&nbsp; 

  <% String name=""; %>
  <%
  name=request.getParameter("thename");
  session.putValue("thename",name); 
  %>
  Your name : <%= name %>
  <p>
  <FORM METHOD=POST ACTION="q3.jsp">
  The food you like :
  <INPUT TYPE=TEXT NAME="food">
  <P>
  <INPUT TYPE=SUBMIT VALUE="SUBMIT">
  </P>
  </FORM>
  </body>
</html>


但在浏览器浏览浏览q2.jsp时却出现如下错误:



HTTP Status 500 - 

--------------------------------------------------------------------------------

type Exception report

message 

description The server encountered an internal error () that prevented it from fulfilling this request.

exception 

org.apache.jasper.JasperException: /q2.jsp(1,1) Page directive must not have multiple occurrences of pageencoding
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:102)
org.apache.jasper.compiler.Validator$DirectiveVisitor.visit(Validator.java:194)
org.apache.jasper.compiler.Node$PageDirective.accept(Node.java:590)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2343)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2393)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2399)
org.apache.jasper.compiler.Node$Root.accept(Node.java:489)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2343)
org.apache.jasper.compiler.Validator.validate(Validator.java:1700)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:165)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:314)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:294)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:281)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)


note The full stack trace of the root cause is available in the Apache Tomcat/6.0.16 logs.


--------------------------------------------------------------------------------

Apache Tomcat/6.0.16


解决方案：

pageEncoding="ISO-8859-1" pageEncoding="GBK"%

不能指定多个pageEncoding

（/q2.jsp(1,1) Page directive must not have multiple occurrences of pageencoding）