为什么在编译Java Servlet时会出现错误？
我创建了一个名为TestingServlet的Java Servlet，并在尝试编译文件时会出现错误。我已经为Servlet-api.jar设置了classPath，并在编译时也尝试了包括class路径：
javac -cp "C:\Program Files\Apache Software Foundation\Tomcat 10.0\lib\servlet-api.jar" TestingServlet.java
代码为：
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
public class TestingServlet extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
PrintWriter out = response.getWriter();
out.println("<HTML>");
out.println("<HEAD>");
out.println("<TITLE>Servlet Testing</TITLE>");
out.println("</HEAD>");
out.println("<BODY>");
out.println("Welcome to the Servlet Testing Center");
out.println("</BODY>");
out.println("</HTML>");
}
}
错误是：
TestingServlet.java:6: error: cannot find symbol
public class TestingServlet extends HttpServlet {
^
symbol: class HttpServlet
TestingServlet.java:8: error: cannot find symbol
public void doGet(HttpServletRequest request,
^
symbol: class HttpServletRequest
location: class TestingServlet
TestingServlet.java:9: error: cannot find symbol
HttpServletResponse response)
^
symbol: class HttpServletResponse
location: class TestingServlet
TestingServlet.java:10: error: cannot find symbol
throws ServletException, IOException {
^
symbol: class ServletException
location: class TestingServlet
TestingServlet.java:1: error: package javax.servlet does not exist
import javax.servlet.*;
^
TestingServlet.java:2: error: package javax.servlet.http does not exist
import javax.servlet.http.*;
^
6 errors
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tomcat 10 Servlet API使用新的
jakarta命名空间，因此包装名称更改，如 Tomcat 10 Page ：所以在你的情况下
Tomcat 10 Servlet API uses the new
jakartanamespace, so the package names changed, as explained in the Tomcat 10 page:So in your case