我正在使用ubuntu,根据我的研究和之前有关编译问题的帖子,我一直在尝试进行编译。这次我怀疑是CLASSPATH,但无法弄清楚到底是什么问题。

(我要包含的Java文件)

/home/makun/tomcat/apache-tomcat-6.0.26/webapps/head_first
/src/com/masatosan/registerservlet/RegisterServlet.java

这是使用RequestDispatcher类扩展HttpServlet的servlet类。

我在tomcat目录中有servlet-api.jar:

/home/makun/tomcat/apache-tomcat-6.0.26/lib/servlet-api.jar

所以我将路径添加到CLASSPATH中,然后我的CLASSPATH看起来像:

CLASSPATH =/usr/bin;。;/home/makun/tomcat/apache-tomcat-6.0.26/webapps/head_first/src;/usr/share/java/lib;/home/makun/Desktop/java_run;/home/makun/tomcat/apache-tomcat-6.0.26/webapps/head_first/src;/usr/share/java/lib;/home/makun/tomcat/apache-tomcat-6.0.26/lib;/home/makun/tomcat/apache-tomcat-6.0.26/lib/servlet-api.jar

现在,我尝试从当前目录/home/makun/tomcat/apache-tomcat-6.0.26/webapps/head_first编译RegisterServlet.java
/src/com/masatosan/registerservlet

javac -verbose -cp。:/home/makun/tomcat/apache-tomcat-6.0.26/lib ./RegisterServlet.java

然后出现邪恶的错误...
makun /home/makun/tomcat/apache-tomcat-6.0.26/webapps/head_first/src/com/masatosan/registerservlet ->javac -verbose -cp .:/home/makun/tomcat/apache-tomcat-6.0.26/lib ./RegisterServlet.java
[parsing started ./RegisterServlet.java]
[parsing completed 81ms]
[search path for source files: .,/home/makun/tomcat/apache-tomcat-6.0.26/lib]
[search path for class files: /usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/resources.jar,/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/rt.jar,/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/sunrsasign.jar,/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/jsse.jar,/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/jce.jar,/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/charsets.jar,/usr/lib/jvm/java-6-sun-1.6.0.20/jre/classes,/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/ext/sunpkcs11.jar,/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/ext/sunjce_provider.jar,/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/ext/localedata.jar,/usr/lib/jvm/java-6-sun-1.6.0.20/jre/lib/ext/dnsns.jar,.,/home/makun/tomcat/apache-tomcat-6.0.26/lib]
[loading java/io/IOException.class(java/io:IOException.class)]
[loading java/util/ArrayList.class(java/util:ArrayList.class)]
[loading java/util/HashMap.class(java/util:HashMap.class)]
[loading java/util/List.class(java/util:List.class)]
[loading java/util/Map.class(java/util:Map.class)]
./RegisterServlet.java:9: package javax.servlet does not exist
import javax.servlet.RequestDispatcher;
                    ^
./RegisterServlet.java:10: package javax.servlet does not exist
import javax.servlet.ServletException;
                    ^
./RegisterServlet.java:11: package javax.servlet.http does not exist
import javax.servlet.http.HttpServlet;
                         ^
./RegisterServlet.java:12: package javax.servlet.http does not exist
import javax.servlet.http.HttpServletRequest;
                         ^
./RegisterServlet.java:13: package javax.servlet.http does not exist
import javax.servlet.http.HttpServletResponse;
                         ^
./RegisterServlet.java:16: cannot find symbol
symbol: class HttpServlet
public class RegisterServlet extends HttpServlet {
                                     ^
[loading java/lang/String.class(java/lang:String.class)]
./RegisterServlet.java:24: cannot find symbol
symbol  : class HttpServletRequest
location: class com.masatosan.registerservlet.RegisterServlet
 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
                   ^
./RegisterServlet.java:24: cannot find symbol
symbol  : class HttpServletResponse
location: class com.masatosan.registerservlet.RegisterServlet
 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
                                               ^
./RegisterServlet.java:24: cannot find symbol
symbol  : class ServletException
location: class com.masatosan.registerservlet.RegisterServlet
 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
                                                                                    ^
./RegisterServlet.java:28: cannot find symbol
symbol  : class HttpServletRequest
location: class com.masatosan.registerservlet.RegisterServlet
 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
                    ^
./RegisterServlet.java:28: cannot find symbol
symbol  : class HttpServletResponse
location: class com.masatosan.registerservlet.RegisterServlet
 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
                                                ^
./RegisterServlet.java:28: cannot find symbol
symbol  : class ServletException
location: class com.masatosan.registerservlet.RegisterServlet
 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
                                                                                     ^
[checking com.masatosan.registerservlet.RegisterServlet]
[loading java/util/AbstractMap.class(java/util:AbstractMap.class)]
[loading java/lang/Object.class(java/lang:Object.class)]
[loading java/lang/Exception.class(java/lang:Exception.class)]
[loading java/lang/Throwable.class(java/lang:Throwable.class)]
./RegisterServlet.java:55: cannot find symbol
symbol  : class RequestDispatcher
location: class com.masatosan.registerservlet.RegisterServlet
  RequestDispatcher dispatcher = request.getRequestDispatcher(address);
  ^
[loading java/lang/CharSequence.class(java/lang:CharSequence.class)]
[loading java/io/Serializable.class(java/io:Serializable.class)]
[loading java/lang/Comparable.class(java/lang:Comparable.class)]
[total 828ms]
13 errors

谁能帮我指出为什么我的编译器找不到RequestDispatcher?

编辑

根据建议,我在CLASSPATH中删除了分号并更改为冒号,还只运行了javac -verbose RegisterServlet.java即可成功编译。

最佳答案

 javac -verbose -cp .:/home/makun/tomcat/apache-tomcat-6.0.26/lib ./RegisterServlet.java

您将在此处覆盖CLASSPATH env变量。您似乎还用;分隔了类路径条目,在* nix上,您可能需要使用:。如果您的CLASSPATH env变量是exported,请执行
 javac -verbose RegisterServlet.java

要么
 javac -cp $CLASSPATH -verbose RegisterServlet.java

10-05 21:10
查看更多