我是新手想请各位高手给点帮助
我是新手自己编写个小程序但有错误,请大家帮忙看看
%@ page contentType="text/html;charset=GBK" %>
<%@include file="a.html"%>
<html>
<head>
<title>表单和JSP结合</title>
</head>
<body>
<center>
<h1>玩具店</h1>
<form action="wan.jsp"method="get">
<p><input type="checkbox" name="wan1"value="绒毛熊">绒毛熊
<input type="checkbox" name="wan1"value="米老鼠">米老鼠
<p><input type="checkbox" name="wan1"value="小狗">小狗
<input type="checkbox" name="wan1"value="唐老鸭">唐老鸭
<p><input type="submit"value="购买"></p>
</form>
<p>现在购买的商品有：
<p><%
String aa[]=request.getParameterValues("wan1");
if(session.getAttribute("wan2") == null) {
session.setAttribute("wan2","ok");
}
session.setAttribute("wan2",session.getAttribute("wan2") +aa);
out.println(session.getAttribute("wan2") + "<br>");
%>
<a href="main.jsp">退出</a>
</html>
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: -1 in the jsp file: null
Generated servlet error:
[javac] Since fork is true, ignoring compiler setting.
[javac] Compiling 1 source file
[javac] Since fork is true, ignoring compiler setting.
[javac] E:\Program Files\Apache Group\Tomcat 4.1\work\Standalone\localhost\_\jsp作业\wan_jsp.java:99: operator + cannot be applied to java.lang.Object,java.lang.String[]
[javac] session.setAttribute("wan2",session.getAttribute("wan2") +aa);
[javac] ^
[javac] 1 error
