我正在嘗試實現基本的 HelloServlet.java 程序。但它似乎產生了這些錯誤HelloServlet.java:7: error: cannot find symbolpublic class HelloServlet extends HttpServlet { ^ symbol: class HttpServletHelloServlet.java:11: error: cannot find symbol public void init() throws ServletException { ^ symbol: class ServletException location: class HelloServletHelloServlet.java:16: error: cannot find symbol public void doGet(HttpServletRequest request, HttpServletResponse response) ^ symbol: class HttpServletRequest location: class HelloServletHelloServlet.java:16: error: cannot find symbol public void doGet(HttpServletRequest request, HttpServletResponse response) ^ symbol: class HttpServletResponse location: class HelloServletHelloServlet.java:17: error: cannot find symbol throws ServletException, IOException { ^ symbol: class ServletException location: class HelloServletHelloServlet.java:3: error: package javax.servlet does not existimport javax.servlet.*;^HelloServlet.java:4: error: package javax.servlet.http does not existimport javax.servlet.http.*;^7 errors我已經為 jar 文件添加了 CLASSPATHnithinchandranp@b-40:~$ echo ${CLASSPATH}/home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/*nithinchandranp@b-40:~$ 現在我做錯了什么？請幫忙..
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小唯快跑啊
TA貢獻1863條經驗 獲得超2個贊
這是我的錯誤。
這就是我通過命令行創建 CLASSPATH 的方式
export CLASSPATH=/home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/*
我創建的目錄不是ApacheTomcat，而是Apache Tomcat（中間有一個空格）。
也許這就是 CLASSPATH 變量無法識別正確位置的原因。
我將目錄名稱更改為 ApacheTomcat（刪除了空格）。
現在我在 .bashrc 文件中定義了 CLASSPATH 變量，如下所示：
#classpath
export CLASSPATH=/home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/*
現在，當我執行 echo${CLASSPATH} 時，我得到了我提到的所有 jar 文件。
nithinchandranp@b-40:~$ echo ${CLASSPATH}
/home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/annotations-api.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/catalina-ant.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/catalina-ha.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/catalina.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/catalina-storeconfig.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/catalina-tribes.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/ecj-4.6.3.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/el-api.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/jasper-el.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/jasper.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/jaspic-api.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/jsp-api.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/servlet-api.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/tomcat-api.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/tomcat-coyote.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/tomcat-dbcp.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/tomcat-i18n-es.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/tomcat-i18n-fr.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/tomcat-i18n-ja.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/tomcat-i18n-ru.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/tomcat-jdbc.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/tomcat-jni.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/tomcat-util.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/tomcat-util-scan.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/tomcat-websocket.jar /home/nithinchandranp/ApacheTomcat/apache-tomcat-8.5.34/lib/websocket-api.jar
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