java急救聊天系统中如何实现服务器端转发数据

Problem to solve:
Write a stack-based Calculator program in Java to support the following operators for integer and floating point data: addition, multiplication, division, subtraction; modulo and square-root Also implement a print operator that prints out the entire stack and a pop operator that discards the top element on the stack Your program should be in pure Java, and can use any of the standard Java Development Kit class library elements Your operand stack should support mixed mode arithmetic and should promote integers to floating point numbers where appropriate Implement appropriate exception handling to cope with malformed input from the user
Specification:
Your program should accept textual input like:
1440 sqrt
120
10 20 add
30
2 3 4 add mult
14
print
12
30
14
pop
pop
20
mult
240
Where the bolded lines are representative of your program’s output See overleaf for further hints and specification notes See also the note on the paper web site on how to use the Java Compilation system

用view隔离区域数据库配置文件
用match-clients匹配网段
如
view “wan” ｛
match-clievts ｛ 19216810、24； ｝；
zone “shcom” IN {
type master;
file "shcomwan" ;
};
｝;
view "lan" {
match-clients { 19216820/24; };
zone "shcom" IN {
type master;
file "shcomlan";
};
};
然后分别建立区域数据库文件就好了；

DNS的那个域里要填上你所有要求的域的主机才行的。不然是没有指向的。。
比如，填上sinacom 19216811 mp3sinacom 19216811 等等都要加上才可以实现 的。。不然就会出现上面的你提到的。。
还可以让你的DNS自动更新。。自已不能解释的网址自动转发到其他DNS上。也是可以的。。。但你设置的sinacom这种域名你必须自已指定才可以。不然就访问不了。。因为别的DNS上没有这些信息。。。。。

在这里参照SLeung大师的帖子，并感谢大师支持：
>