用于多方多媒体通信的框架协议。它是一个基于文本的应用层控制协议, 独立于底层传输协议, 用于建立、修改和终止IP网络上的双方或多方多媒体会话。 1.
1. final final 意为最终的、不可更改的,它可以用来修饰类、方法、属性、局部变量等。 .1. 修饰类 被 final 修改的类不能被其它类所继承,如 Integer、Strin
学习记录javaUtil各种工具使用; 1. StringRelative 1.1. StringTokenizer **StringTokenizer(String str):**构造一个用来解析str的StringTokenizer对象。java默认的分隔
WebRTC,名称源自网页实时通信(Web Real-Time Communication)的缩写,是一项实时通讯技术,它允许网络应用或者站点,在不借助中间媒介
1. MapReduce The key and value classes have to be serializable by the framework and hence need to implement the Writable interface. Additionally, the key classes have to implement the WritableComparable interface to facilitate sorting by the framework. Input and Output types of a MapReduce job. import java.io.IOException; import java.util.Random; import java.util.StringTokenizer; import java.util.Iterator; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.Path; import org.apache.hadoop.io.IntWritable; import org.apache.hadoop.io.Text; import org.apache.hadoop.io.WritableComparable; import org.apache.hadoop.mapreduce.Job; import org.apache.hadoop.mapreduce.Mapper; import org.apache.hadoop.mapreduce.Reducer;
1. VirtualBox配置SSH远程登录 sudo apt-get install openssh-server sudo apt-get install openssh-client sudo apt-get install ssh ssh localhost #ssh: connect to hostlocalhost port 22: Connection refused 表示没有安装成功 #关闭防火墙 sudo ufw disable #-----桥接方式网