java中如何从ip地址获取子网
我获得ip（ipv4，如192.168.161.125），如何获得我的电脑所在的子网？ 首选java方法和字符串格式的结果 子网是使用ip地址和子网掩码计算的网络java中如何从ip地址获取子网,java,networking,ip,ipv4,subnet,Java,Networking,Ip,Ipv4,Subnet,我获得ip（ipv4，如192.168.161.125），如何获得我的电脑所在的子网？ 首选java方法和字符串格式的结果 子网是使用ip地址和子网掩码计算的网络 谢谢。这是您在Java中的实现方式 import java.util.ArrayList; import java.util.List; public class IPv4 { int baseIPnumeric; int netmaskNumeric; public IPv4(String symbolic
谢谢。这是您在Java中的实现方式
import java.util.ArrayList;
import java.util.List;
public class IPv4 {
int baseIPnumeric;
int netmaskNumeric;
public IPv4(String symbolicIP, String netmask) throws NumberFormatException {
/* IP */
String[] st = symbolicIP.split("\\.");
if (st.length != 4)
throw new NumberFormatException("Invalid IP address: " + symbolicIP);
int i = 24;
baseIPnumeric = 0;
for (int n = 0; n < st.length; n++) {
int value = Integer.parseInt(st[n]);
if (value != (value & 0xff)) {
throw new NumberFormatException("Invalid IP address: "+ symbolicIP);
}
baseIPnumeric += value << i;
i -= 8;
}
/* Netmask */
st = netmask.split("\\.");
if (st.length != 4)
throw new NumberFormatException("Invalid netmask address: "
+ netmask);
i = 24;
netmaskNumeric = 0;
if (Integer.parseInt(st[0]) < 255) {
throw new NumberFormatException(
"The first byte of netmask can not be less than 255");
}
for (int n = 0; n < st.length; n++) {
int value = Integer.parseInt(st[n]);
if (value != (value & 0xff)) {
throw new NumberFormatException("Invalid netmask address: " + netmask);
}
netmaskNumeric += value << i;
i -= 8;
}
/*
* see if there are zeroes inside netmask, like: 1111111101111 This is
* illegal, throw exception if encountered. Netmask should always have
* only ones, then only zeroes, like: 11111111110000
*/
boolean encounteredOne = false;
int ourMaskBitPattern = 1;
for (i = 0; i < 32; i++) {
if ((netmaskNumeric & ourMaskBitPattern) != 0) {
encounteredOne = true; // the bit is 1
} else { // the bit is 0
if (encounteredOne == true)
throw new NumberFormatException("Invalid netmask: " + netmask + " (bit " + (i + 1) + ")");
}
ourMaskBitPattern = ourMaskBitPattern << 1;
}
}
/**
* Specify IP in CIDR format like: new IPv4("10.1.0.25/16");
*
*@param IPinCIDRFormat
*/
public IPv4(String IPinCIDRFormat) throws NumberFormatException {
String[] st = IPinCIDRFormat.split("\\/");
if (st.length != 2)
throw new NumberFormatException("Invalid CIDR format '"
+ IPinCIDRFormat + "', should be: xx.xx.xx.xx/xx");
String symbolicIP = st[0];
String symbolicCIDR = st[1];
Integer numericCIDR = new Integer(symbolicCIDR);
if (numericCIDR > 32)
throw new NumberFormatException("CIDR can not be greater than 32");
/* IP */
st = symbolicIP.split("\\.");
if (st.length != 4)
throw new NumberFormatException("Invalid IP address: " + symbolicIP);
int i = 24;
baseIPnumeric = 0;
for (int n = 0; n < st.length; n++) {
int value = Integer.parseInt(st[n]);
if (value != (value & 0xff)) {
throw new NumberFormatException("Invalid IP address: " + symbolicIP);
}
baseIPnumeric += value << i;
i -= 8;
}
/* netmask from CIDR */
if (numericCIDR < 8)
throw new NumberFormatException("Netmask CIDR can not be less than 8");
netmaskNumeric = 0xffffffff;
netmaskNumeric = netmaskNumeric << (32 - numericCIDR);
}
/**
* Get the IP in symbolic form, i.e. xxx.xxx.xxx.xxx
*
*@return
*/
public String getIP() {
return convertNumericIpToSymbolic(baseIPnumeric);
}
private String convertNumericIpToSymbolic(Integer ip) {
StringBuffer sb = new StringBuffer(15);
for (int shift = 24; shift > 0; shift -= 8) {
// process 3 bytes, from high order byte down.
sb.append(Integer.toString((ip >>> shift) & 0xff));
sb.append('.');
}
sb.append(Integer.toString(ip & 0xff));
return sb.toString();
}
/**
* Get the net mask in symbolic form, i.e. xxx.xxx.xxx.xxx
*
*@return
*/
public String getNetmask() {
StringBuffer sb = new StringBuffer(15);
for (int shift = 24; shift > 0; shift -= 8) {
// process 3 bytes, from high order byte down.
sb.append(Integer.toString((netmaskNumeric >>> shift) & 0xff));
sb.append('.');
}
sb.append(Integer.toString(netmaskNumeric & 0xff));
return sb.toString();
}
/**
* Get the IP and netmask in CIDR form, i.e. xxx.xxx.xxx.xxx/xx
*
*@return
*/
public String getCIDR() {
int i;
for (i = 0; i < 32; i++) {
if ((netmaskNumeric << i) == 0)
break;
}
return convertNumericIpToSymbolic(baseIPnumeric & netmaskNumeric) + "/" + i;
}
/**
* Get an arry of all the IP addresses available for the IP and netmask/CIDR
* given at initialization
*
*@return
*/
public List<String> getAvailableIPs(Integer numberofIPs) {
ArrayList<String> result = new ArrayList<String>();
int numberOfBits;
for (numberOfBits = 0; numberOfBits < 32; numberOfBits++) {
if ((netmaskNumeric << numberOfBits) == 0)
break;
}
Integer numberOfIPs = 0;
for (int n = 0; n < (32 - numberOfBits); n++) {
numberOfIPs = numberOfIPs << 1;
numberOfIPs = numberOfIPs | 0x01;
}
Integer baseIP = baseIPnumeric & netmaskNumeric;
for (int i = 1; i < (numberOfIPs) && i < numberofIPs; i++) {
Integer ourIP = baseIP + i;
String ip = convertNumericIpToSymbolic(ourIP);
result.add(ip);
}
return result;
}
/**
* Range of hosts
*
*@return
*/
public String getHostAddressRange() {
int numberOfBits;
for (numberOfBits = 0; numberOfBits < 32; numberOfBits++) {
if ((netmaskNumeric << numberOfBits) == 0)
break;
}
Integer numberOfIPs = 0;
for (int n = 0; n < (32 - numberOfBits); n++) {
numberOfIPs = numberOfIPs << 1;
numberOfIPs = numberOfIPs | 0x01;
}
Integer baseIP = baseIPnumeric & netmaskNumeric;
String firstIP = convertNumericIpToSymbolic(baseIP + 1);
String lastIP = convertNumericIpToSymbolic(baseIP + numberOfIPs - 1);
return firstIP + " - " + lastIP;
}
/**
* Returns number of hosts available in given range
*
*@return number of hosts
*/
public Long getNumberOfHosts() {
int numberOfBits;
for (numberOfBits = 0; numberOfBits < 32; numberOfBits++) {
if ((netmaskNumeric << numberOfBits) == 0)
break;
}
Double x = Math.pow(2, (32 - numberOfBits));
if (x == -1)
x = 1D;
return x.longValue();
}
/**
* The XOR of the netmask
*
*@return wildcard mask in text form, i.e. 0.0.15.255
*/
public String getWildcardMask() {
Integer wildcardMask = netmaskNumeric ^ 0xffffffff;
StringBuffer sb = new StringBuffer(15);
for (int shift = 24; shift > 0; shift -= 8) {
// process 3 bytes, from high order byte down.
sb.append(Integer.toString((wildcardMask >>> shift) & 0xff));
sb.append('.');
}
sb.append(Integer.toString(wildcardMask & 0xff));
return sb.toString();
}
public String getBroadcastAddress() {
if (netmaskNumeric == 0xffffffff)
return "0.0.0.0";
int numberOfBits;
for (numberOfBits = 0; numberOfBits < 32; numberOfBits++) {
if ((netmaskNumeric << numberOfBits) == 0)
break;
}
Integer numberOfIPs = 0;
for (int n = 0; n < (32 - numberOfBits); n++) {
numberOfIPs = numberOfIPs << 1;
numberOfIPs = numberOfIPs | 0x01;
}
Integer baseIP = baseIPnumeric & netmaskNumeric;
Integer ourIP = baseIP + numberOfIPs;
String ip = convertNumericIpToSymbolic(ourIP);
return ip;
}
private String getBinary(Integer number) {
String result = "";
Integer ourMaskBitPattern = 1;
for (int i = 1; i <= 32; i++) {
if ((number & ourMaskBitPattern) != 0) {
result = "1" + result; // the bit is 1
} else { // the bit is 0
result = "0" + result;
}
if ((i % 8) == 0 && i != 0 && i != 32)
result = "." + result;
ourMaskBitPattern = ourMaskBitPattern << 1;
}
return result;
}
public String getNetmaskInBinary() {
return getBinary(netmaskNumeric);
}
/**
* Checks if the given IP address contains in subnet
*
*@param IPaddress
*@return
*/
public boolean contains(String IPaddress) {
Integer checkingIP = 0;
String[] st = IPaddress.split("\\.");
if (st.length != 4)
throw new NumberFormatException("Invalid IP address: " + IPaddress);
int i = 24;
for (int n = 0; n < st.length; n++) {
int value = Integer.parseInt(st[n]);
if (value != (value & 0xff)) {
throw new NumberFormatException("Invalid IP address: "
+ IPaddress);
}
checkingIP += value << i;
i -= 8;
}
if ((baseIPnumeric & netmaskNumeric) == (checkingIP & netmaskNumeric))
return true;
else
return false;
}
public boolean contains(IPv4 child) {
Integer subnetID = child.baseIPnumeric;
Integer subnetMask = child.netmaskNumeric;
if ((subnetID & this.netmaskNumeric) == (this.baseIPnumeric & this.netmaskNumeric)) {
if ((this.netmaskNumeric < subnetMask) == true
&& this.baseIPnumeric <= subnetID) {
return true;
}
}
return false;
}
/**
*@param args
*/
public static void main(String[] args) {
IPv4 ipv4 = new IPv4("192.168.161.125/30"); //30 is the CIDR for Mask 255.255.255.252
System.out.println(ipv4.getCIDR());
System.out.println(ipv4.getNetmask());
System.out.println(ipv4.getNumberOfHosts());
System.out.println(ipv4.getWildcardMask());
System.out.println(ipv4.getBroadcastAddress());
System.out.println(ipv4.getHostAddressRange());
}
}
import java.util.ArrayList；
导入java.util.List；
公共类IPv4{
int baseIPnumeric；
int netmaskNumeric；
公共IPv4（字符串符号CIP、字符串网络掩码）引发NumberFormatException{
/*知识产权*/
字符串[]st=symbolicIP.split（“\\”）；
如果（标准长度！=4）
抛出新的NumberFormatException（“无效IP地址：+symbolicIP”）；
int i=24；
baseIPnumeric=0；
对于（int n=0；n0；shift-=8）{
//处理3个字节，从高阶字节向下。
sb.append（Integer.toString（（netmaskNumeric>>>shift）&0xff））；
某人附加（'.'）；
}
sb.append（Integer.toString（netmaskNumeric&0xff））；
使某人返回字符串（）；
}
/**
*以CIDR格式获取IP和网络掩码，即xxx.xxx.xxx.xxx/xx
*
*@返回
*/
公共字符串getCIDR（）{
int i；
对于（i=0；i<32；i++）{
如果（（netmaskNumeric这是在Java中执行的方式
import java.util.ArrayList;
import java.util.List;
public class IPv4 {
int baseIPnumeric;
int netmaskNumeric;
public IPv4(String symbolicIP, String netmask) throws NumberFormatException {
/* IP */
String[] st = symbolicIP.split("\\.");
if (st.length != 4)
throw new NumberFormatException("Invalid IP address: " + symbolicIP);
int i = 24;
baseIPnumeric = 0;
for (int n = 0; n < st.length; n++) {
int value = Integer.parseInt(st[n]);
if (value != (value & 0xff)) {
throw new NumberFormatException("Invalid IP address: "+ symbolicIP);
}
baseIPnumeric += value << i;
i -= 8;
}
/* Netmask */
st = netmask.split("\\.");
if (st.length != 4)
throw new NumberFormatException("Invalid netmask address: "
+ netmask);
i = 24;
netmaskNumeric = 0;
if (Integer.parseInt(st[0]) < 255) {
throw new NumberFormatException(
"The first byte of netmask can not be less than 255");
}
for (int n = 0; n < st.length; n++) {
int value = Integer.parseInt(st[n]);
if (value != (value & 0xff)) {
throw new NumberFormatException("Invalid netmask address: " + netmask);
}
netmaskNumeric += value << i;
i -= 8;
}
/*
* see if there are zeroes inside netmask, like: 1111111101111 This is
* illegal, throw exception if encountered. Netmask should always have
* only ones, then only zeroes, like: 11111111110000
*/
boolean encounteredOne = false;
int ourMaskBitPattern = 1;
for (i = 0; i < 32; i++) {
if ((netmaskNumeric & ourMaskBitPattern) != 0) {
encounteredOne = true; // the bit is 1
} else { // the bit is 0
if (encounteredOne == true)
throw new NumberFormatException("Invalid netmask: " + netmask + " (bit " + (i + 1) + ")");
}
ourMaskBitPattern = ourMaskBitPattern << 1;
}
}
/**
* Specify IP in CIDR format like: new IPv4("10.1.0.25/16");
*
*@param IPinCIDRFormat
*/
public IPv4(String IPinCIDRFormat) throws NumberFormatException {
String[] st = IPinCIDRFormat.split("\\/");
if (st.length != 2)
throw new NumberFormatException("Invalid CIDR format '"
+ IPinCIDRFormat + "', should be: xx.xx.xx.xx/xx");
String symbolicIP = st[0];
String symbolicCIDR = st[1];
Integer numericCIDR = new Integer(symbolicCIDR);
if (numericCIDR > 32)
throw new NumberFormatException("CIDR can not be greater than 32");
/* IP */
st = symbolicIP.split("\\.");
if (st.length != 4)
throw new NumberFormatException("Invalid IP address: " + symbolicIP);
int i = 24;
baseIPnumeric = 0;
for (int n = 0; n < st.length; n++) {
int value = Integer.parseInt(st[n]);
if (value != (value & 0xff)) {
throw new NumberFormatException("Invalid IP address: " + symbolicIP);
}
baseIPnumeric += value << i;
i -= 8;
}
/* netmask from CIDR */
if (numericCIDR < 8)
throw new NumberFormatException("Netmask CIDR can not be less than 8");
netmaskNumeric = 0xffffffff;
netmaskNumeric = netmaskNumeric << (32 - numericCIDR);
}
/**
* Get the IP in symbolic form, i.e. xxx.xxx.xxx.xxx
*
*@return
*/
public String getIP() {
return convertNumericIpToSymbolic(baseIPnumeric);
}
private String convertNumericIpToSymbolic(Integer ip) {
StringBuffer sb = new StringBuffer(15);
for (int shift = 24; shift > 0; shift -= 8) {
// process 3 bytes, from high order byte down.
sb.append(Integer.toString((ip >>> shift) & 0xff));
sb.append('.');
}
sb.append(Integer.toString(ip & 0xff));
return sb.toString();
}
/**
* Get the net mask in symbolic form, i.e. xxx.xxx.xxx.xxx
*
*@return
*/
public String getNetmask() {
StringBuffer sb = new StringBuffer(15);
for (int shift = 24; shift > 0; shift -= 8) {
// process 3 bytes, from high order byte down.
sb.append(Integer.toString((netmaskNumeric >>> shift) & 0xff));
sb.append('.');
}
sb.append(Integer.toString(netmaskNumeric & 0xff));
return sb.toString();
}
/**
* Get the IP and netmask in CIDR form, i.e. xxx.xxx.xxx.xxx/xx
*
*@return
*/
public String getCIDR() {
int i;
for (i = 0; i < 32; i++) {
if ((netmaskNumeric << i) == 0)
break;
}
return convertNumericIpToSymbolic(baseIPnumeric & netmaskNumeric) + "/" + i;
}
/**
* Get an arry of all the IP addresses available for the IP and netmask/CIDR
* given at initialization
*
*@return
*/
public List<String> getAvailableIPs(Integer numberofIPs) {
ArrayList<String> result = new ArrayList<String>();
int numberOfBits;
for (numberOfBits = 0; numberOfBits < 32; numberOfBits++) {
if ((netmaskNumeric << numberOfBits) == 0)
break;
}
Integer numberOfIPs = 0;
for (int n = 0; n < (32 - numberOfBits); n++) {
numberOfIPs = numberOfIPs << 1;
numberOfIPs = numberOfIPs | 0x01;
}
Integer baseIP = baseIPnumeric & netmaskNumeric;
for (int i = 1; i < (numberOfIPs) && i < numberofIPs; i++) {
Integer ourIP = baseIP + i;
String ip = convertNumericIpToSymbolic(ourIP);
result.add(ip);
}
return result;
}
/**
* Range of hosts
*
*@return
*/
public String getHostAddressRange() {
int numberOfBits;
for (numberOfBits = 0; numberOfBits < 32; numberOfBits++) {
if ((netmaskNumeric << numberOfBits) == 0)
break;
}
Integer numberOfIPs = 0;
for (int n = 0; n < (32 - numberOfBits); n++) {
numberOfIPs = numberOfIPs << 1;
numberOfIPs = numberOfIPs | 0x01;
}
Integer baseIP = baseIPnumeric & netmaskNumeric;
String firstIP = convertNumericIpToSymbolic(baseIP + 1);
String lastIP = convertNumericIpToSymbolic(baseIP + numberOfIPs - 1);
return firstIP + " - " + lastIP;
}
/**
* Returns number of hosts available in given range
*
*@return number of hosts
*/
public Long getNumberOfHosts() {
int numberOfBits;
for (numberOfBits = 0; numberOfBits < 32; numberOfBits++) {
if ((netmaskNumeric << numberOfBits) == 0)
break;
}
Double x = Math.pow(2, (32 - numberOfBits));
if (x == -1)
x = 1D;
return x.longValue();
}
/**
* The XOR of the netmask
*
*@return wildcard mask in text form, i.e. 0.0.15.255
*/
public String getWildcardMask() {
Integer wildcardMask = netmaskNumeric ^ 0xffffffff;
StringBuffer sb = new StringBuffer(15);
for (int shift = 24; shift > 0; shift -= 8) {
// process 3 bytes, from high order byte down.
sb.append(Integer.toString((wildcardMask >>> shift) & 0xff));
sb.append('.');
}
sb.append(Integer.toString(wildcardMask & 0xff));
return sb.toString();
}
public String getBroadcastAddress() {
if (netmaskNumeric == 0xffffffff)
return "0.0.0.0";
int numberOfBits;
for (numberOfBits = 0; numberOfBits < 32; numberOfBits++) {
if ((netmaskNumeric << numberOfBits) == 0)
break;
}
Integer numberOfIPs = 0;
for (int n = 0; n < (32 - numberOfBits); n++) {
numberOfIPs = numberOfIPs << 1;
numberOfIPs = numberOfIPs | 0x01;
}
Integer baseIP = baseIPnumeric & netmaskNumeric;
Integer ourIP = baseIP + numberOfIPs;
String ip = convertNumericIpToSymbolic(ourIP);
return ip;
}
private String getBinary(Integer number) {
String result = "";
Integer ourMaskBitPattern = 1;
for (int i = 1; i <= 32; i++) {
if ((number & ourMaskBitPattern) != 0) {
result = "1" + result; // the bit is 1
} else { // the bit is 0
result = "0" + result;
}
if ((i % 8) == 0 && i != 0 && i != 32)
result = "." + result;
ourMaskBitPattern = ourMaskBitPattern << 1;
}
return result;
}
public String getNetmaskInBinary() {
return getBinary(netmaskNumeric);
}
/**
* Checks if the given IP address contains in subnet
*
*@param IPaddress
*@return
*/
public boolean contains(String IPaddress) {
Integer checkingIP = 0;
String[] st = IPaddress.split("\\.");
if (st.length != 4)
throw new NumberFormatException("Invalid IP address: " + IPaddress);
int i = 24;
for (int n = 0; n < st.length; n++) {
int value = Integer.parseInt(st[n]);
if (value != (value & 0xff)) {
throw new NumberFormatException("Invalid IP address: "
+ IPaddress);
}
checkingIP += value << i;
i -= 8;
}
if ((baseIPnumeric & netmaskNumeric) == (checkingIP & netmaskNumeric))
return true;
else
return false;
}
public boolean contains(IPv4 child) {
Integer subnetID = child.baseIPnumeric;
Integer subnetMask = child.netmaskNumeric;
if ((subnetID & this.netmaskNumeric) == (this.baseIPnumeric & this.netmaskNumeric)) {
if ((this.netmaskNumeric < subnetMask) == true
&& this.baseIPnumeric <= subnetID) {
return true;
}
}
return false;
}
/**
*@param args
*/
public static void main(String[] args) {
IPv4 ipv4 = new IPv4("192.168.161.125/30"); //30 is the CIDR for Mask 255.255.255.252
System.out.println(ipv4.getCIDR());
System.out.println(ipv4.getNetmask());
System.out.println(ipv4.getNumberOfHosts());
System.out.println(ipv4.getWildcardMask());
System.out.println(ipv4.getBroadcastAddress());
System.out.println(ipv4.getHostAddressRange());
}
}
import java.util.ArrayList；
导入java.util.List；
公共类IPv4{
int baseIPnumeric；
int netmaskNumeric；
公共IPv4（字符串符号CIP、字符串网络掩码）引发NumberFormatException{
/*知识产权*/
字符串[]st=symbolicIP.split（“\\”）；
如果（标准长度！=4）
抛出新的NumberFormatException（“无效IP地址：+symbolicIP”）；
int i=24；
baseIPnumeric=0；
对于（int n=0；n0；shift-=8）{
//处理3个字节，从高阶字节向下。
sb.append（Integer.toString（（netmaskNumeric>>>shift）&0xff））；
某人附加（'.'）；
}
sb.append（Integer.toString（netmaskNumeric&0xff））；
使某人返回字符串（）；
}
/**
*以CIDR格式获取IP和网络掩码，即xxx.xxx.xxx.xxx/xx
*
*@返回
*/
公共字符串getCIDR（）{
int i；
对于（i=0；i<32；i++）{
if（（netmaskNumeric是一种简单的方法。假设我们将子网掩码和ip地址分成两个字符串：
String[] mask = subnetMaskString.split("\\.");
String[] ipAddress = ipAddressString.split("\\.");
StringBuffer ipSubnet = new StringBuffer();
for(int i=0; i<4; i++)
try{
if(ipSubnet.length()>0)
ipSubnet.append('.');
ipSubnet.append(Integer.parseInt(ipAddress[i]) & Integer.parseInt(mask[i]));
}catch(Exception x){
//Integer parsing exception, wrong ipaddress or mask
break;
}
// if no exception ipSubnet.toString() is the subnet ip //
String[]mask=subnetMaskString.split（“\\”）；
字符串[]ipAddress=ipAddressString.split（“\\”）；
StringBuffer ipSubnet=新的StringBuffer（）；
对于（int i=0；i0）
ipSubnet.append（'.'）；
append（Integer.parseInt（ipAddress[i]）和Integer.parseInt（mask[i]）；
}捕获（异常x）{
//整数解析异常，IP地址或掩码错误
打破
}
//如果没有异常，ipSubnet.toString（）是子网ip//
一种简单的方法。假设我们将子网掩码和ip地址分成两个字符串：
String[] mask = subnetMaskString.split("\\.");
String[] ipAddress = ipAddressString.split("\\.");
StringBuffer ipSubnet = new StringBuffer();
for(int i=0; i<4; i++)
try{
if(ipSubnet.length()>0)
ipSubnet.append('.');
ipSubnet.append(Integer.parseInt(ipAddress[i]) & Integer.parseInt(mask[i]));
}catch(Exception x){
//Integer parsing exception, wrong ipaddress or mask
break;
}
// if no exception ipSubnet.toString() is the subnet ip //
String[]mask=subnetMaskString.split（“\\”）；
字符串[]ipAddress=ipAddressString.split（“\\”）；
StringBuffer ipSubnet=新的StringBuffer（）；
对于（int i=0；i0）
ipSubnet.append（'.'）；
append（Integer.parseInt（ipAddress[i]）和Integer.parseInt（mask[i]）；
}捕获（异常x）{
//整数解析异常，IP地址或掩码错误
打破
}
//如果没有异常，ipSubnet.toString（）是子网ip//
以多态方式支持IPv4和IPv6子网。免责声明：我是项目经理
下面是您的示例的示例代码，地址为192.168.161.125，子网掩码为255.255.255.252
第一个方法解析字符串addr/mask：
public static String getNetwork1(String addrStr, String maskStr) throws AddressStringException {
IPAddressString addrString = new IPAddressString(addrStr + IPAddress.PREFIX_LEN_SEPARATOR + maskStr);
IPAddress addr = addrString.toAddress();
IPAddress subnet = addr.toPrefixBlock();
return subnet.toString();
}
第二种方法屏蔽地址以获取网络：
public static String getNetwork2(String addrStr, String maskStr) throws AddressStringException {
IPAddressString addrString = new IPAddressString(addrStr);
IPAddressString maskString = new IPAddressString(maskStr);
IPAddress addr = addrString.toAddress();
IPAddress mask = maskString.toAddress();
IPAddress masked = addr.mask(mask);
return masked.toString();
}
public static String getNetwork3(String addrStr, String maskStr) throws AddressStringException {
IPAddressString addrString = new IPAddressString(addrStr);
IPAddressString maskString = new IPAddressString(maskStr);
IPAddress addr = addrString.toAddress();
IPAddress mask = maskString.toAddress();
Integer prefLen = mask.getBlockMaskPrefixLength(true);
IPAddress subnet = addr.setPrefixLength(prefLen).toPrefixBlock();
return subnet.toString();
}
第三种方法从掩码获取前缀长度以获取网络：
public static String getNetwork2(String addrStr, String maskStr) throws AddressStringException {
IPAddressString addrString = new IPAddressString(addrStr);
IPAddressString maskString = new IPAddressString(maskStr);
IPAddress addr = addrString.toAddress();
IPAddress mask = maskString.toAddress();
IPAddress masked = addr.mask(mask);
return masked.toString();
}
public static String getNetwork3(String addrStr, String maskStr) throws AddressStringException {
IPAddressString addrString = new IPAddressString(addrStr);
IPAddressString maskString = new IPAddressString(maskStr);
IPAddress addr = addrString.toAddress();
IPAddress mask = maskString.toAddress();
Integer prefLen = mask.getBlockMaskPrefixLength(true);
IPAddress subnet = addr.setPrefixLength(prefLen).toPrefixBlock();
return subnet.toString();
}
使用三个选项：
String addrString = "192.168.161.125";
String maskString = "255.255.255.252";
System.out.println(getNetwork1(addrString, maskString));
System.out.println(getNetwork2(addrString, maskString));
System.out.println(getNetwork3(addrString, maskString));
我们得到的结果是：
192.168.161.124/30
192.168.161.124
192.168.161.124/30
要删除第一个和第三个地址结果上的前缀长度，可以使用withoutPrefixLength（）。以多态方式支持IPv4和IPv6子网。免责声明：我是项目经理
下面是您的示例的示例代码，地址为192.168.161.125，子网掩码为255.255.255.252
第一个方法解析字符串addr/mask：
public static String getNetwork1(String addrStr, String maskStr) throws AddressStringException {
IPAddressString addrString = new IPAddressString(addrStr + IPAddress.PREFIX_LEN_SEPARATOR + maskStr);
IPAddress addr = addrString.toAddress();
IPAddress subnet = addr.toPrefixBlock();
return subnet.toString();
}
第二种方法屏蔽地址以获取网络：
public static String getNetwork2(String addrStr, String maskStr) throws AddressStringException {
IPAddressString addrString = new IPAddressString(addrStr);
IPAddressString maskString = new IPAddressString(maskStr);
IPAddress addr = addrString.toAddress();
IPAddress mask = maskString.toAddress();
IPAddress masked = addr.mask(mask);
return masked.toString();
}
public static String getNetwork3(String addrStr, String maskStr) throws AddressStringException {
IPAddressString addrString = new IPAddressString(addrStr);
IPAddressString maskString = new IPAddressString(maskStr);
IPAddress addr = addrString.toAddress();
IPAddress mask = maskString.toAddress();
Integer prefLen = mask.getBlockMaskPrefixLength(true);
IPAddress subnet = addr.setPrefixLength(prefLen).toPrefixBlock();
return subnet.toString();
}
第三种方法从掩码获取前缀长度以获取网络：
public static String getNetwork2(String addrStr, String maskStr) throws AddressStringException {
IPAddressString addrString = new IPAddressString(addrStr);
IPAddressString maskString = new IPAddressString(maskStr);
IPAddress addr = addrString.toAddress();
IPAddress mask = maskString.toAddress();
IPAddress masked = addr.mask(mask);
return masked.toString();
}
public static String getNetwork3(String addrStr, String maskStr) throws AddressStringException {
IPAddressString addrString = new IPAddressString(addrStr);
IPAddressString maskString = new IPAddressString(maskStr);
IPAddress addr = addrString.toAddress();
IPAddress mask = maskString.toAddress();
Integer prefLen = mask.getBlockMaskPrefixLength(true);
IPAddress subnet = addr.setPrefixLength(prefLen).toPrefixBlock();
return subnet.toString();
}
使用三个选项：
String addrString = "192.168.161.125";
String maskString = "255.255.255.252";
System.out.println(getNetwork1(addrString, maskString));
System.out.println(getNetwork2(addrString, maskString));
System.out.println(getNetwork3(addrString, maskString));
我们得到的结果是：
192.168.161.124/30
192.168.161.124
192.168.161.124/30
要删除第一个和第三个地址结果上的前缀长度，不带outprefixlength（）可以使用。你好，谢谢。但是我想要的是我的电脑所在的子网。例如，我的电脑的ip是192.168.161.125，子网掩码是255.255.255.252，然后子网是192.168.161.124，它的十六进制前体是c0a8a17b。这是关于位计算的，我不熟悉。你能给我一些建议吗