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org.apache.jasper.JasperException：无法编译 JSP 类：

发布于 2024-12-08 17:29:09 字数 2901 浏览 1 评论 0原文

可能的重复：
如何在JSP/Servlet中上传文件？

我使用的是 tomcat 6.0 我有以下 jsp 代码

 <%@ 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>

，但收到此错误

 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());%></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 文件位于 WEB-INF/classes/pkg 文件夹中 为什么我会收到此错误。以及为什么它显示 get1() 未定义。我在 data.java 中有 get1() 函数。 connectdb() 是 jdbc java 文件）。我已经编译了所有 java 类来获取 .class 文件。这个 while 循环会显示我的数据库的所有详细信息
data.java 的代码

 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;
}
}
原文

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());%></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;
}
}

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评论（2）

残龙傲雪 2024-12-15 17:29:09

List 接口 没有 get1() 和 get2() 方法。它所拥有的只是 a <代码>get()方法。也许您打算改用它：

<td><%out.print(da1.get(1));%></td>
<td><%out.print(da1.get(2));%></td>

请注意，列表索引以 0 开头，而不是 1。也许您也想改变这一点。

另请参阅：

不相关对于具体问题，我不知道你想做什么，但我只想提一下这段代码是一场灾难，并暴露了更多其他问题（首先，你认为用 while (da1 ！=空）？你想无限循环地展示它们吗？）。我强烈建议忘记这方面的 JSP，并将所有工作移至普通 Java 类，然后使用 main() 方法将其作为普通 Java 应用程序进行测试，该方法通过 打印结果>System.out.println()。这使得开发、使用和测试变得更加容易。一旦一切正常，您就可以在 servlet 中导入并调用该类，最终让 JSP 显示结果。

更新：

这是您通常希望循环列表的方式（我已经修复了可怕的命名约定基于最佳

List<Work> works = workService.list();

for (Work work : works) {
    System.out.println(work.getPropertyNumber());
    System.out.println(work.getStartDate());
}

href="https://stackoverflow.com/questions/7666544/use-jsp-as-both-view-and-controller">猜测，以便 通常会在 JSP 中对其进行循环

<c:forEach items="${works}" var="work">
    <td>${work.propertyNumber}</td>
    <td>${work.startDate}</td>
</c:forEach>

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:

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>
回复 原文
柠檬心 2024-12-15 17:29:09

da1 变量的类型为 List。它不包含方法 get1() 和 get2()。您可能想要的是 da1.get(1)、da1.get(2) 等。

<%out.print(da1.get(1));%>
<%out.print(da1.get(2));%>

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));%>
回复 原文
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