Possible Duplicate:
How to upload files in JSP/Servlet?
I am using tomcat 6.0 I have the following jsp code
<%@ page import="java.util.*" %>
<!doctype HTML public "-//W3C//DTD HTML 4.0 Frameset//EN">
<html>
<head>
</head>
<body>
<table>
<tr>
<td>Name</td>
<td>Start Date</td>
</tr>
<%
List<data> da1 = conb.dat();
while(da1 != null) {
%>
<tr>
<td><%out.print(da1.get1());%></td>
<td><%out.print(da1.get2());%></td>
</tr>
<%
}
%>
</table>
</body>
</html>
and i am getting this error
org.apache.jasper.JasperException: Unable to compile class for JSP:
An error occurred at line: 68 in the jsp file: /trands.jsp
The method get1() is undefined for the type List<data>
65: <%
66: data da = new pkg.data();
67: List<data> da1 = conb.dat();
68: while(da1 != null) {
69: %>
70: <tr>
71: <td><%out.print(da1.get1());%>&开发者_运维问答lt;/td>
An error occurred at line: 69 in the jsp file: /trands.jsp
The method get2() is undefined for the type List<data>
66: data da = new data();
67: List<data> da1 = conb.dat();
68: while(da1 != null) {
69: %>
70: <tr>
71: <td><%out.print(da1.get1());%></td>
72: <td><%out.print(da1.get2());%></td>
Stacktrace:
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java: 92)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:439)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:356)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:334)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:321)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:592)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:328)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
java files are in WEB-INF/classes/pkg folder why am i getting this error. and why its showing that get1() is undefined. i have get1() function in data.java. connectdb() is jdbc java file). I have compiled all the java class to get the .class files. and will this while loop show me all the details of my database
CODE FOR data.java package pkg;
public class data
{
public String propn;
public String startd;
public data()
{
}
public void set1(String a)
{
propn=a;
}
public String get1()
{
return propn;
}
public void set2(String b)
{
startd=b;
}
public String get2()
{
return startd;
}
}
The List interface does not have get1() and get2() methods. All it has is a get() method. Perhaps you intended to use that instead:
<td><%out.print(da1.get(1));%></td>
<td><%out.print(da1.get(2));%></td>
Note that the list index starts with 0, not 1. Perhaps you'd like to change that as well.
See also:
- Java Collections Tutorial
Unrelated to the concrete problem, I have no idea what you're trying to do, but I would only mention that this code is a disaster and exposes more other problems (to start, what did you think to achieve with while (da1 != null)? did you want to show them in an infinite loop?). I'd strongly recommend to forget JSP for this bit and move all the work to a normal Java class which you in turn test as normal Java application with a main() method which prints the results by System.out.println(). That's much easier developing, playing and testing. Once you got it all to work, then you can import and call that class in a servlet which ultimately lets the JSP display the results.
Update:
Here's how you would normally like to loop over a list (I've fixed the terrible naming conventions for you based on best guesses so that the code is more self-documenting):
List<Work> works = workService.list();
for (Work work : works) {
System.out.println(work.getPropertyNumber());
System.out.println(work.getStartDate());
}
And here's how you would normally loop over it in a JSP
<c:forEach items="${works}" var="work">
<td>${work.propertyNumber}</td>
<td>${work.startDate}</td>
</c:forEach>
The da1 variable is of type List. It does not contain method get1() and get2(). What you probably want is da1.get(1), da1.get(2) etc.
<%out.print(da1.get(1));%>
<%out.print(da1.get(2));%>
![Interactive visualization of a graph in python [closed]](https://www.devze.com/res/2023/04-10/09/92d32fe8c0d22fb96bd6f6e8b7d1f457.gif)
加载中,请稍侯......
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