java - 如何重写GenericServlet？

This question already has answers here:

Error: “<Class> is not abstract and does not override abstract method <method>”

(3个答案)


2年前关闭。




这是我的代码

public class hi extends GenericServlet{
    public void init(ServletConfig parm1){

    }

    @Override
    public void service(ServletRequest req,ServletRequest res){
        PrintWriter pw = res.getWriter();
        pw.println("hi");
    }
}

当我尝试对其进行编译时:

hi.java:16: error: hi is not abstract and does not override abstract method service(ServletRequest,ServletResponse) in GenericServlet
public class hi extends GenericServlet{
       ^
hi.java:21: error: method does not override or implement a method from a supertype
    @Override
    ^
hi.java:23: error: cannot find symbol
        PrintWriter pw = res.getWriter();
                            ^
  symbol:   method getWriter()
  location: variable res of type ServletRequest
3 errors

我想我已经重写了GenericServlet的service方法，但是编译器确实做到了，让我非常困惑...

最佳答案

服务方法的第二个参数应为ServletResponse

关于java - 如何重写GenericServlet？ ，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/49710390/