共享资源
集中软件管理
IP地址
协议
端口号
MAC地址
面向连接的无连接协议
Socket
TCP
FTP
Telnet
SMTP
POP等。
验证者
CacheRequest
CacheResponse
ContentHandler
CookieHandler
CookieManager
DatagramPacket
DatagramSocket
DatagramSocketImpl
InterfaceAddress
JarURLConnection
MulticastSocket
InetSocketAddress
InetAddress
Inet4Address
Inet6Address
IDN
HttpURLConnection
HttpCookie
NetPermission
NetworkInterface
密码验证
代理
ProxySelector
ResponseCache
SecureCacheResponse
ServerSocket
套接字
SocketAddress
SocketImpl
SocketPermission
StandardSocketOptions
URI
URL
URLClassLoader
URLConnection
URLDecoder
URLEncoder
URLStreamHandler
Java Socket
Java URL
Java URLConnection
Java HttpURLConnection
Java InetAddress
Java DatagramSocket和DatagramPacket