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我正在尝试编译要在 webapp 中使用的源代码。我知道 Ubuntu 中的东西不像 Windows 中的东西，classpath永久设置不是一件好事，所以我决定暂时设置标志。这是我在终端中的命令：

littlejavachild@ubuntu:~/LittleJavaChild/ServletProjects/beerV1$ javac -cp "/usr/share/tomcat7/servlet-api.jar" -d classes src/com/example/*.java

我想要实现的是：

  • 编译.java包中的所有文件com.example
  • 将.class文件直接发送到适当的目录
  • 将classes文件夹复制到WEB-INF文件夹

    • 尽管设置了classpath我得到的错误： 

    src/com/example/ListenerTester.java:3: error: package javax.servlet does not exist
import javax.servlet.*;
^
src/com/example/ListenerTester.java:4: error: package javax.servlet.http does not exist
import javax.servlet.http.*;
^
src/com/example/ListenerTester.java:7: error: cannot find symbol
public class ListenerTester extends HttpServlet{
                                    ^
  symbol: class HttpServlet
src/com/example/ListenerTester.java:8: error: cannot find symbol
    public void doGet(HttpServletRequest request,
                      ^
  symbol:   class HttpServletRequest
  location: class ListenerTester
src/com/example/ListenerTester.java:9: error: cannot find symbol
                HttpServletResponse response) throws IOException, ServletException {
                ^
  symbol:   class HttpServletResponse
  location: class ListenerTester
src/com/example/ListenerTester.java:9: error: cannot find symbol
                HttpServletResponse response) throws IOException, ServletException {
                                                                  ^
  symbol:   class ServletException
  location: class ListenerTester
src/com/example/MyServletContextListener.java:2: error: package javax.servlet does not exist
import javax.servlet.*;
^
src/com/example/MyServletContextListener.java:4: error: cannot find symbol
public class MyServletContextListener implements ServletContextListener{
                                                 ^
  symbol: class ServletContextListener
src/com/example/MyServletContextListener.java:5: error: cannot find symbol
    public void contextInitialized(ServletContextEvent event){
                                   ^
  symbol:   class ServletContextEvent
  location: class MyServletContextListener
src/com/example/MyServletContextListener.java:12: error: cannot find symbol
    public void contextDestroyed(ServletContextEvent event){
                                 ^
  symbol:   class ServletContextEvent
  location: class MyServletContextListener
src/com/example/ListenerTester.java:14: error: cannot find symbol
        Dog dog = (Dog) getServletContext().getAttribute("dog");
                        ^
  symbol:   method getServletContext()
  location: class ListenerTester
src/com/example/MyServletContextListener.java:6: error: cannot find symbol
        ServletContext sc = event.getServletContext();
        ^
  symbol:   class ServletContext
  location: class MyServletContextListener

    我知道当类路径设置不正确时会发生这些错误。请帮我解决一下这个。告诉我哪里出了问题，我该如何纠正它以及将来如何避免它。

    使用 -verbose 更新

    【类文件的搜索路径：/usr/lib/jvm/java-7-openjdk-i386/jre/lib/resources.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/rt .jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/sunrsasign.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/jsse.jar,/ usr/lib/jvm/java-7-openjdk-i386/jre/lib/jce.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/charsets.jar,/usr/lib/ jvm/java-7-openjdk-i386/jre/lib/netx.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/plugin.jar,/usr/lib/jvm/java- 7-openjdk-i386/jre/lib/rhino.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/jfr.jar,/usr/lib/jvm/java-7-openjdk- i386/jre/classes,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/ext/localedata.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/ ext/sunjce_provider.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/ext/dnsns.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/ ext/java-atk-wrapper.jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/ext/pulse-java.jar，/usr/lib/jvm/java-7-openjdk-i386/jre/lib/ext/sunpkcs11。 jar,/usr/lib/jvm/java-7-openjdk-i386/jre/lib/ext/zipfs.jar,.,/usr/share/tomcat7/servlet-api.jar]

    4

    2 回答 2

    4

    将任务分成几部分，让我们先尝试编译 java 文件。稍后检查如何移动类文件。

    该错误确实表明它没有找到所需的类，因此 jar 未正确添加到类路径中。检查这个

    javac -classpath .:/usr/share/tomcat7/servlet-api.jar src/com/example/*.java

    确保罐子存在于给定位置。还可以尝试从 src 文件夹运行它并将路径指定为 com/example/*.java

    于 2013-02-26T07:05:12.133 回答
    2

    我会尝试使用-classpath而不是-cp. javac的Ubuntu 手册页没有指明-cp选项。您还可以添加-verbose以从javac.

    注意：我的 mac 上的 javac 实现不同意，但我不在 ubuntu 机器 atm 上。

    于 2013-02-26T07:06:58.777 回答