requestgetRemoteAddr(); IP获取
requestgetRemotePort(): 端口号
Java是一种可以撰写跨平台应用软件的面向对象的程序设计语言。
Java 技术具有卓越的通用性、高效性、平台移植性和安全性,广泛应用于PC、数据中心、游戏控制台、科学超级计算机、移动电话和互联网,同时拥有全球最大的开发者专业社群。
Java分为三个体系:
1Java SE(J2SE,Java2 Platform Standard Edition,标准版),
2JavaEE(J2EE,Java 2 Platform, Enterprise Edition,企业版),
3Java ME(J2ME,Java 2 Platform Micro Edition,微型版)。
java获取本机的外网ip示例:
import javaioIOException;
import javaioInputStream;
import javanet>
方法如下:
方法一,使用CMD命令:
public static String getLocalIPForCMD(){
StringBuilder sb = new StringBuilder();
String command = "cmdexe /c ipconfig | findstr IPv4";
try {
Process p = RuntimegetRuntime()exec(command);
BufferedReader br = new BufferedReader(new InputStreamReader(pgetInputStream()));
String line = null;
while((line = brreadLine()) != null){
line = linesubstring(linelastIndexOf(":")+2,linelength());
sbappend(line);
}
brclose();
pdestroy();
} catch (IOException e) {
eprintStackTrace();
}
return sbtoString();
}
方法二,使用Java方法:
public static String getLocalIPForJava(){
StringBuilder sb = new StringBuilder();
try {
Enumeration<NetworkInterface> en = NetworkInterfacegetNetworkInterfaces();
while (enhasMoreElements()) {
NetworkInterface intf = (NetworkInterface) ennextElement();
Enumeration<InetAddress> enumIpAddr = intfgetInetAddresses();
while (enumIpAddrhasMoreElements()) {
InetAddress inetAddress = (InetAddress) enumIpAddrnextElement();
if (!inetAddressisLoopbackAddress() && !inetAddressisLinkLocalAddress()
&& inetAddressisSiteLocalAddress()) {
sbappend(inetAddressgetHostAddress()toString()+"\n");
}
}
}
} catch (SocketException e) { }
return sbtoString();
}
第一种:获取本机的IP
Enumeration<NetworkInterface>
netInterfaces
=
null;
try
{
netInterfaces
=
NetworkInterfacegetNetworkInterfaces();
while
(netInterfaceshasMoreElements())
{
NetworkInterface
ni
=
netInterfacesnextElement();
Systemoutprintln("DisplayName:"
+
nigetDisplayName());
Systemoutprintln("Name:"
+
nigetName());
Enumeration<InetAddress>
ips
=
nigetInetAddresses();
while
(ipshasMoreElements())
{
Systemoutprintln("IP:"
+
ipsnextElement()getHostAddress());
ipTemp=
nigetInetAddresses()nextElement()getHostAddress();
if(ipTemp!="127001"
&&
!"127001"equals(ipTemp))
{
ip=ipTemp;
}
}
}
}catch(Exception
ee)
{
eeprintStackTrace();
}
第二种:也是本机的:
InetAddress
addr
=
InetAddressgetLocalHost();
ip=addrgetHostAddress()toString();//获得本机IP
1得到局域网网段,可由自己机器的IP来确定 (也可以手动获取主机IP-CMD-ipconfig /all)
2根据IP类型,一次遍历局域网内IP地址
JAVA类,编译之后直接运行便可以得到局域网内所有IP,具体怎样使用你自己编写相应代码调用便可
代码如下::
package bean;
import javaio;
import javautil;
public class Ip{
static public HashMap ping; //ping 后的结果集
public HashMap getPing(){ //用来得到ping后的结果集
return ping;
}
//当前线程的数量, 防止过多线程摧毁电脑
static int threadCount = 0;
public Ip() {
ping = new HashMap();
}
public void Ping(String ip) throws Exception{
//最多30个线程
while(threadCount>30)
Threadsleep(50);
threadCount +=1;
PingIp p = new PingIp(ip);
pstart();
}
public void PingAll() throws Exception{
//首先得到本机的IP,得到网段
InetAddress host = InetAddressgetLocalHost();
String hostAddress = hostgetHostAddress();
int k=0;
k=hostAddresslastIndexOf("");
String ss = hostAddresssubstring(0,k+1);
for(int i=1;i <=255;i++){ //对所有局域网Ip
String iip=ss+i;
Ping(iip);
}
//等着所有Ping结束
while(threadCount>0)
Threadsleep(50);
}
public static void main(String[] args) throws Exception{
Ip ip= new Ip();
ipPingAll();
javautilSet entries = pingentrySet();
Iterator iter=entriesiterator();
String k;
while(iterhasNext()){
MapEntry entry=(MapEntry)iternext();
String key=(String)entrygetKey();
String value=(String)entrygetValue();
if(valueequals("true"))
Systemoutprintln(key+"-->"+value);
}
}
class PingIp extends Thread{
public String ip; // IP
public PingIp(String ip){
thisip=ip;
}
public void run(){
try{
Process p= RuntimegetRuntime()exec ("ping "+ip+ " -w 300 -n 1");
InputStreamReader ir = new InputStreamReader(pgetInputStream());
LineNumberReader input = new LineNumberReader (ir);
//读取结果行
for (int i=1 ; i <7; i++)
inputreadLine();
String line= inputreadLine();
if (linelength() <17 || linesubstring(8,17)equals("timed out"))
pingput(ip,"false");
else
pingput(ip,"true");
//线程结束
threadCount -= 1;
}catch (IOException e){}
}
}
}
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