Http接口demo，servlet实现

请求URL样例https://IP:PORT/server?service=QueryService&method=QueryUserInfo¶m={user_id:123456}&sign=401821a49bcd375f47150f66f17ae966×tamp=12321313返回参数json格式样例：{state:’ok’,returnValue:{userName:’名字’}}{state:’error’,message:’出错信息’}