jsp form表单submit后 request.getParameter获取的值为null

Question

public class ReverseString{
public static String reverse(String s){
char []c=new char[s.length()];
for(int i=0;i<s.length();i++)
c[i]=s.charAt(s.length()-1-i);
return String.valueOf(c);
}
public static void main(String[] args){
String s="abc";
s=reverse(s);
System.out.println(s);
}
}

Answer 1

1、jsp页面代码是怎么写的
2、name是否正确