package xx.yy;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class hello extends HttpServlet{
public void init(ServletConfig config) throws ServletException{
super.init(config);
}
public void service(HttpServletRequest requert,HttpServletResponse response)
throws IOException{
response.setContentType("text/html;charset=GB2312");
PrintWriter out = response.getWriter();
out.println("<html><body>");
out.println("<h2>北京欢迎你!</h2>");
out.println("</body></html>");
}
}
就是这个,hello下面有红线,说是可序列化的类 hello 未声明类型为 long 的静态终态 serialVersionUID 字段,请问这是为什么,我不会用这个,怎么解决呢