io.polaris.core.net.Nets Maven / Gradle / Ivy
package io.polaris.core.net;
import io.polaris.core.io.IO;
import io.polaris.core.string.Strings;
import java.io.*;
import java.net.*;
import java.nio.channels.Channels;
import java.nio.channels.FileChannel;
import java.nio.channels.ReadableByteChannel;
import java.nio.file.StandardOpenOption;
import java.util.concurrent.ThreadLocalRandom;
import java.util.regex.Pattern;
import javax.annotation.Nonnull;
/**
* @author Qt
* @since 1.8
*/
public class Nets {
/** 默认最小端口，1024 */
public static final int PORT_RANGE_MIN = 1024;
/** 默认最大端口，65535 */
public static final int PORT_RANGE_MAX = 65535;
private static final String IPV4_BASIC_PATTERN_STRING =
"(([1-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){1}" + // initial first field, 1-255
"(([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\\.){2}" + // following 2 fields, 0-255 followed by .
"([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])"; // final field, 0-255
private static final Pattern IPV4_PATTERN = Pattern.compile("^" + IPV4_BASIC_PATTERN_STRING + "$");
private static final Pattern IPV4_MAPPED_IPV6_PATTERN = Pattern.compile("^::[fF]{4}:" + IPV4_BASIC_PATTERN_STRING + "$");
private static final Pattern IPV6_STD_PATTERN = Pattern.compile("^[0-9a-fA-F]{1,4}(:[0-9a-fA-F]{1,4}){7}$");
private static final Pattern IPV6_HEX_COMPRESSED_PATTERN = Pattern.compile(
"^(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)" + // 0-6 hex fields
"::" +
"(([0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){0,5})?)$"); // 0-6 hex fields
private static final char COLON_CHAR = ':';
private static final int MAX_COLON_COUNT = 7;
public static boolean isValidPort(int port) {
return port >= 0 && port <= PORT_RANGE_MAX;
}
public static boolean isUsableLocalPort(int port) {
if (!isValidPort(port)) {
return false;
}
try (ServerSocket ss = new ServerSocket(port);) {
ss.close();
return true;
} catch (Exception e) {
return false;
}
}
public static int getUsableLocalPort() {
return getUsableLocalPort(PORT_RANGE_MIN);
}
public static int getUsableLocalPort(int minPort) {
return getUsableLocalPort(minPort, PORT_RANGE_MAX);
}
public static int getUsableLocalPort(int minPort, int maxPort) {
for (int i = minPort; i <= maxPort; i++) {
if (isUsableLocalPort(i)) {
return i;
}
}
return -1;
}
public static int getRandomLocalPort() {
try (ServerSocket ss = new ServerSocket(0);) {
int port = ss.getLocalPort();
ss.close();
return port;
} catch (Exception e) {
return -1;
}
}
public static int getRandomLocalPort(int minPort, int maxPort) {
for (int i = minPort; i <= maxPort; i++) {
int port = ThreadLocalRandom.current().nextInt(minPort, maxPort + 1);
if (isUsableLocalPort(port)) {
return port;
}
}
return -1;
}
public static String getLocalMacAddress() throws UnknownHostException {
return getMacAddress(InetAddress.getLocalHost());
}
public static String getMacAddress(InetAddress inetAddress) {
return getMacAddress(inetAddress, "-");
}
public static String getMacAddress(InetAddress inetAddress, String separator) {
if (null == inetAddress) {
return null;
}
byte[] mac;
try {
mac = NetworkInterface.getByInetAddress(inetAddress).getHardwareAddress();
} catch (SocketException e) {
return null;
}
if (null != mac) {
final StringBuilder sb = new StringBuilder();
String s;
for (int i = 0; i < mac.length; i++) {
if (i != 0) {
sb.append(separator);
}
s = Integer.toHexString(mac[i] & 0xFF);
sb.append(s.length() == 1 ? 0 + s : s);
}
return sb.toString();
}
return null;
}
public static InetSocketAddress createAddress(String host, int port) {
if (Strings.isBlank(host)) {
return new InetSocketAddress(port);
}
return new InetSocketAddress(host, port);
}
public static String send(String host, final int port, final String content) throws IOException {
try (
Socket socket = new Socket(host, port);
BufferedReader reader = new BufferedReader(new InputStreamReader(socket.getInputStream()));
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(socket.getOutputStream()))
) {
writer.write(content);
writer.newLine();
writer.flush();
return IO.toString(reader);
}
}
public static byte[] downloadBytes(final String url) throws IOException {
try (InputStream inputStream = new URL(url).openStream()) {
return IO.toBytes(inputStream);
}
}
public static String downloadString(final String url, final String encoding) throws IOException {
try (InputStream inputStream = new URL(url).openStream()) {
return IO.toString(inputStream, encoding);
}
}
public static String downloadString(final String url) throws IOException {
try (InputStream inputStream = new URL(url).openStream()) {
return IO.toString(inputStream);
}
}
public static void downloadFile(final String url, final File file) throws IOException {
try (
InputStream inputStream = new URL(url).openStream();
ReadableByteChannel rbc = Channels.newChannel(inputStream);
FileChannel fileChannel = FileChannel.open(
file.toPath(),
StandardOpenOption.CREATE,
StandardOpenOption.TRUNCATE_EXISTING,
StandardOpenOption.WRITE)
) {
fileChannel.transferFrom(rbc, 0, Long.MAX_VALUE);
}
}
public static long getRemoteFileSize(String url) throws IOException {
HttpURLConnection connection = null;
try {
connection = (HttpURLConnection) new URL(url).openConnection();
return connection.getContentLengthLong();
} finally {
if (connection != null) {
connection.disconnect();
}
}
}
public static boolean isIPv4Address(final String input) {
return IPV4_PATTERN.matcher(input).matches();
}
public static boolean isIPv4MappedIPv64Address(final String input) {
return IPV4_MAPPED_IPV6_PATTERN.matcher(input).matches();
}
public static boolean isIPv6StdAddress(final String input) {
return IPV6_STD_PATTERN.matcher(input).matches();
}
public static boolean isIPv6HexCompressedAddress(final String input) {
int colonCount = 0;
for (int i = 0; i < input.length(); i++) {
if (input.charAt(i) == COLON_CHAR) {
colonCount++;
}
}
return colonCount <= MAX_COLON_COUNT && IPV6_HEX_COMPRESSED_PATTERN.matcher(input).matches();
}
public static boolean isIPv6Address(final String input) {
return isIPv6StdAddress(input) || isIPv6HexCompressedAddress(input);
}
}