编译错误-Tomcat、jsp
所有，
我刚刚安装了apache tomcat并且测试安装确实显示了“成功安装”apache页面。我确实执行了 HelloWorld 示例，没有任何问题。现在，我在 \apache-tomcat-XXX\webapps\mine 下创建了自己的 Web 应用程序，其中包含以下 2 个子文件夹：
\apache-tomcat-XXX\webapps\mine\classes >\apache-tomcat-XXX\webapps\mine\lib
我创建了一个新的类文件 HelloWorldAgain.java ，其内容如下：
import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
/**
* My test servlet
*
* @author Liz Warner
*/
public class Hi extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>Hola</title>");
out.println("</head>");
out.println("<body bgcolor=\"white\">");
out.println("<h1> Hi </h1>");
out.println("</body>");
out.println("</html>");
}
}
但是，当我从命令行编译代码时，我收到与
> Hi.java:4: package javax.servlet does not exist
import javax.servlet.*;
^
Hi.java:5: package javax.servlet.http does not exist
import javax.servlet.http.*;
^
Hi.java:13: cannot find symbol
symbol: class HttpServlet
public class Hi extends HttpServlet {
^
Hi.java:15: cannot find symbol
symbol : class HttpServletRequest
location: class Hi
public void doGet(HttpServletRequest request,
^
Hi.java:16: cannot find symbol
symbol : class HttpServletResponse
location: class Hi
HttpServletResponse response)
^
Hi.java:17: cannot find symbol
symbol : class ServletException
location: class Hi
throws IOException, ServletException
我设置了以下环境（Windows XP 环境）变量相关的错误：
JAVA_HOME: C:\Program Files\Java\jdk1.6.0_21 CATALINA_HOME: C:\Apache Tomcat\apache-tomcat-7.0.22
All,
I just installed apache tomcat and testing the installtion did show the "Successfully installed" apache page. I did execute the HelloWorld example without any issues. So now, I created my own web application under \apache-tomcat-XXX\webapps\mine with following 2 subfolders:
\apache-tomcat-XXX\webapps\mine\classes\apache-tomcat-XXX\webapps\mine\lib
I created a new class file HelloWorldAgain.java with following contents:
import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
/**
* My test servlet
*
* @author Liz Warner
*/
public class Hi extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws IOException, ServletException
{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html>");
out.println("<head>");
out.println("<title>Hola</title>");
out.println("</head>");
out.println("<body bgcolor=\"white\">");
out.println("<h1> Hi </h1>");
out.println("</body>");
out.println("</html>");
}
}
However, when I compile the code from command line, I get errors related to
> Hi.java:4: package javax.servlet does not exist
import javax.servlet.*;
^
Hi.java:5: package javax.servlet.http does not exist
import javax.servlet.http.*;
^
Hi.java:13: cannot find symbol
symbol: class HttpServlet
public class Hi extends HttpServlet {
^
Hi.java:15: cannot find symbol
symbol : class HttpServletRequest
location: class Hi
public void doGet(HttpServletRequest request,
^
Hi.java:16: cannot find symbol
symbol : class HttpServletResponse
location: class Hi
HttpServletResponse response)
^
Hi.java:17: cannot find symbol
symbol : class ServletException
location: class Hi
throws IOException, ServletException
I have set the following environement (Windows XP env.) variables:
JAVA_HOME: C:\Program Files\Java\jdk1.6.0_21
CATALINA_HOME: C:\Apache Tomcat\apache-tomcat-7.0.22
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您的 Java 类使用不属于 Java SE 的其他 Java 类（“普通”或“桌面”Java），例如
javax.servlet中的 Java EE 类。因此，编译器不知道它们，除非您告诉它在哪里查找这些类。您需要找到类似javaee.jar或servlet.jar的东西——Tomcat 应该将它们包含在其libs/目录中，尽管我忘记了正是他们的名字。然后，您可以使用
javac -cp path/to/javaee.jar... 将它们添加到编译命令中。这实际上与 Tomcat 或 J2EE 无关，它只是基本的 Java 编译。
Your Java class uses other Java classes that are not part of Java SE ("normal" or "desktop" Java) -- the Java EE classes in
javax.servletfor example. So, the compiler doesn't know about them unless you tell it where to look for those classes. You need to find something likejavaee.jarorservlet.jar-- Tomcat ought to contain them in itslibs/dir, though I forget exactly what they are called.Then you add them to your compile command with
javac -cp path/to/javaee.jar... for example.This is really nothing specific to Tomcat or J2EE, it's just basic Java compiling.