package first;
import javax.servlet.*;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
public class HelloServlet extends HttpServlet{
public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException,IOException{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<h1>Hello World!</h1>");
out.close();
}
}
我一开始用txt写怎么也javac不了,后来搬到eclipse里面写,发现:
为什么一定要重复的导javax.servlet.*;这一行下面那三行的包?
这一行不是应该已经包含下面三个包了吗?
这三行随便我注掉哪一行下面的代码就要报错。这是为什么?