Class NetUtil

java.lang.Object

jodd.io.NetUtil

public class NetUtil
extends Object

Network utilities.

Field Summary

Fields

Modifier and Type	Field	Description
static final String	DEFAULT_MASK
static final int	INT_VALUE_127_0_0_1
private static final Pattern	ip4RegExp
static final String	LOCAL_HOST
static final String	LOCAL_IP

Constructor Summary

Constructors

Constructor	Description
NetUtil()

Method Summary

Modifier and Type	Method	Description
static byte[]	downloadBytes(String url)	Downloads resource as byte array.
static void	downloadFile(String url, File file)	Downloads resource to a file, potentially very efficiently.
static String	downloadString(String url)	Downloads resource as String.
static String	downloadString(String url, Charset encoding)	Downloads resource as String.
static int	getIpAsInt(String ipAddress)	Returns IP address as integer.
static int	getMaskAsInt(String mask)
static long	getRemoteFileSize(String url)	Get remote file size.
static boolean	isSocketAccessAllowed(int localIp, int socketIp, int mask)
static String	resolveHostName(byte[] ip)	Resolves host name from IP address bytes.
static String	resolveIpAddress(String hostname)	Resolves IP address from a hostname.
static boolean	validateIPv4(String input)	Checks given string against IP address v4 format.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

LOCAL_HOST

public static final String LOCAL_HOST

See Also:

• Constant Field Values

LOCAL_IP

public static final String LOCAL_IP

See Also:

• Constant Field Values

DEFAULT_MASK

public static final String DEFAULT_MASK

See Also:

• Constant Field Values

INT_VALUE_127_0_0_1

public static final int INT_VALUE_127_0_0_1

See Also:

• Constant Field Values

ip4RegExp

private static final Pattern ip4RegExp

Constructor Details

NetUtil

public NetUtil()

Method Details

resolveIpAddress

public static String resolveIpAddress(String hostname)

Resolves IP address from a hostname.

getIpAsInt

public static int getIpAsInt(String ipAddress)

Returns IP address as integer.

getMaskAsInt

public static int getMaskAsInt(String mask)

isSocketAccessAllowed

public static boolean isSocketAccessAllowed(int localIp,
 int socketIp,
 int mask)

validateIPv4

public static boolean validateIPv4(String input)

Checks given string against IP address v4 format.

Parameters:

input - an ip address - may be null

Returns:

true if param has a valid ip v4 format false otherwise

See Also:

• ip address v4

resolveHostName

public static String resolveHostName(byte[] ip)

Resolves host name from IP address bytes.

downloadBytes

public static byte[] downloadBytes(String url)
                            throws IOException

Downloads resource as byte array.

Throws:

IOException

downloadString

public static String downloadString(String url,
 Charset encoding)
                             throws IOException

Downloads resource as String.

Throws:

IOException

downloadString

public static String downloadString(String url)
                             throws IOException

Downloads resource as String.

Throws:

IOException

downloadFile

public static void downloadFile(String url,
 File file)
                         throws IOException

Downloads resource to a file, potentially very efficiently.

Throws:

IOException

getRemoteFileSize

public static long getRemoteFileSize(String url)
                              throws IOException

Get remote file size. Returns -1 if the content length is unknown

Parameters:

url - remote file url

Returns:

file size

Throws:

IOException - JDK-IOException