Develop Reference

Using dnsjava to query using java?

I am trying to query using the google public dns server (8.8.8.8) to get the IP address of some known URL. However, it seems like I am not able to get that using the following code? I am using the dnsjava java library. This is my current code
The results
Lookup lookup = new Lookup("stackoverflow.com", Type.NS);
SimpleResolver resolver=new SimpleResolver("8.8.8.8");
lookup.setDefaultResolver(resolver);
lookup.setResolver(resolver);
Record [] records = lookup.run();
for (int i = 0; i < records.length; i++) {
Record r = (Record ) records[i];
System.out.println(r.getName()+","+r.getAdditionalName());
}
}
catch ( Exception ex) {
ex.printStackTrace();
logger.error(ex.getMessage(),ex);
}
Results:
stackoverflow.com.,ns-1033.awsdns-01.org.
stackoverflow.com.,ns-cloud-e1.googledomains.com.
stackoverflow.com.,ns-cloud-e2.googledomains.com.
stackoverflow.com.,ns-358.awsdns-44.com.

You don’t need a DNS library just to look up an IP address. You can simply use JNDI:
Properties env = new Properties();
env.setProperty(Context.INITIAL_CONTEXT_FACTORY,
"com.sun.jndi.dns.DnsContextFactory");
env.setProperty(Context.PROVIDER_URL, "dns://8.8.8.8");
DirContext context = new InitialDirContext(env);
Attributes list = context.getAttributes("stackoverflow.com",
new String[] { "A" });
NamingEnumeration<? extends Attribute> records = list.getAll();
while (records.hasMore()) {
Attribute record = records.next();
String name = record.get().toString();
System.out.println(name);
}
If you insist on using the dnsjava library, you need to use Type.A (as your code was originally doing, before your edit).
Looking at the documentation for the Record class, notice the long list under Direct Known Subclasses. You need to cast each Record to the appropriate subclass, which in this case is ARecord.
Once you’ve done that cast, you have an additional method available, getAddress:
for (int i = 0; i < records.length; i++) {
ARecord r = (ARecord) records[i];
System.out.println(r.getName() + "," + r.getAdditionalName()
+ " => " + r.getAddress());
}

Extracting .pst file to msg but not getting exact number of msg file

I am trying to extract pst file into msg.
I am using aspose jar. I share my code where we get exact number of file in each subfolder.
public static void displayFolderAndMessageInformationForPSTFile(String dataDir) {
// Load the Outlook PST file
PersonalStorage pst = PersonalStorage.fromFile(dataDir + "allen.pst");
// Get the folders information
FolderInfoCollection folderInfoCollection = pst.getRootFolder().getSubFolders();
// Browse through each folder to display folder name and number of messages
for (int i = 0; i < folderInfoCollection.size(); i++) {
FolderInfo folderInfo = (FolderInfo) folderInfoCollection.get_Item(i);
System.out.println("FolderId: " + folderInfo.getEntryIdString());
System.out.println("Folder: " + folderInfo.getDisplayName());
System.out.println("Total items: " + folderInfo.getContentCount());
System.out.println("Total unread items: " + folderInfo.getContentUnreadCount());
System.out.println("-----------------------------------");
}
}
FolderId: AAAAAJJu05VTxVRJlC5mJefQvVeCgAAA
Folder: Inbox
Total items: 66
Total unread items: 0
But when extract message content then i get different number of msg. It give only 49 msg in inbox folder.
The following below code:
public static void main(String[] args) {
String pstFileName = dataDir + "allen.pst";
// Load the Outlook PST file
PersonalStorage pst = PersonalStorage.fromFile(pstFileName);
// Get the folders and messages information
FolderInfo folderInfo = pst.getRootFolder();
// Create a folder for this PST
String strRootFolderName = "allen.pst".replace(".pst", "") + ".Java";
new File(dataDir + strRootFolderName).mkdir();
// Call the recursive method to extract msg files from each folder
extractMsgFiles(folderInfo, pst, dataDir + strRootFolderName);
}
private static void extractMsgFiles(FolderInfo folderInfo, PersonalStorage pst, String strPSTFile) {
// Display the folder name
System.out.println("Folder: " + folderInfo.getDisplayName());
// Create folder to store the messages
String folderName = strPSTFile + "\\" + folderInfo.getDisplayName();
new File(folderName).mkdir();
// Loop through all the messages in this folder
MessageInfoCollection messageInfoCollection = folderInfo.getContents();
for (int i = 0; i < messageInfoCollection.size(); i++) {
MessageInfo messageInfo = (MessageInfo) messageInfoCollection.get_Item(i);
System.out.println("Saving message " + messageInfo.getSubject() + "....");
// Get the message in MapiMessage instance
MapiMessage message = pst.extractMessage(messageInfo);
// Delete special characters which are invalid to use as windows file name
String messageName = null;
if (message.getSubject() == null || message.getSubject().isEmpty() == true) {
messageName = getRidOfIllegalFileNameCharacters(messageInfo.getEntryIdString());
} else {
messageName = getRidOfIllegalFileNameCharacters(message.getSubject());
}
// Save this message to disk in MSG format
message.save(folderName + "\\" + messageName + ".msg");
}
// Call this method recursively for each subfolder
if (folderInfo.hasSubFolders() == true) {
for (int i = 0; i < folderInfo.getSubFolders().size(); i++) {
FolderInfo subfolderInfo = (FolderInfo) folderInfo.getSubFolders().get_Item(i);
extractMsgFiles(subfolderInfo, pst, strPSTFile);
}
}
}
Help me... Where did i make mistake ? I am new in Aspose.

Please have a look at the following code snippet for extracting message files. You may use this method in place of your extractMsgFiles method.
private static void ExtractMsgFiles(FolderInfo folderInfo, PersonalStorage pst)
{
// display the folder name
Console.WriteLine("Folder: " + folderInfo.DisplayName);
Console.WriteLine("==================================");
// loop through all the messages in this folder
MessageInfoCollection messageInfoCollection = folderInfo.GetContents();
foreach (MessageInfo messageInfo in messageInfoCollection)
{
Console.WriteLine("Saving message {0} ....", messageInfo.Subject);
// get the message in MapiMessage instance
MapiMessage message = pst.ExtractMessage(messageInfo);
// save this message to disk in msg format
message.Save(message.Subject.Replace(":", " ") + ".msg");
// save this message to stream in msg format
MemoryStream messageStream = new MemoryStream();
message.Save(messageStream);
}
// Call this method recursively for each subfolder
if (folderInfo.HasSubFolders == true)
{
foreach (FolderInfo subfolderInfo in folderInfo.GetSubFolders())
{
ExtractMsgFiles(subfolderInfo, pst);
}
}
}
You may visit the link Working with Messages in a PST File in case you are interested in more details.
I work with Aspose as Developer evangelist.

The emails not having unique subject names could be causing this issue? I had this exact issue when doing something similar in Powershell. Putting an autonumber in the filename could help get around this.

IBM Filenet Content Navigator Custom Plugin - GridX row goes blank after editing properties

I'm working on an ICN plugin and having trouble fixing this glitch, every result loads the way it is supposed to on the grid widget but as soon as I make any changes to it on the right panel and save them, the grid seems to reload that row but it goes blank since it isn't loading the attributes bound to the columns I specified on the java code to build the grid.
I'm using the "Chapter 6 Creating a feature with search services and widgets" demo plugin from the ibm redbook as example, but where exactly on this sort of plugin can I make navigator load these custom columns and its attributes I want it to reload after editing?
NOTE:
By default columns I mean these, attributes every row will always have by default:
row.addAttribute("ID", doc.get_Id().toString(), JSONResultSetRow.TYPE_STRING, null, doc.get_Id().toString());
row.addAttribute("className", doc.getClassName(), JSONResultSetRow.TYPE_STRING, null, doc.getClassName());
row.addAttribute("ModifiedBy", doc.get_LastModifier(), JSONResultSetRow.TYPE_STRING, null, doc.get_LastModifier());
row.addAttribute("LastModified", doc.get_DateLastModified().toString(), JSONResultSetRow.TYPE_TIMESTAMP, null, doc.get_DateLastModified().toString());
row.addAttribute("Version", doc.get_MajorVersionNumber() + "." + doc.get_MinorVersionNumber(), JSONResultSetRow.TYPE_STRING, null, doc.get_MajorVersionNumber() + "." + doc.get_MinorVersionNumber());
row.addAttribute("{NAME}", doc.get_Name(), JSONResultSetRow.TYPE_STRING, null, doc.get_Name());
row.addAttribute("ContentSize", doc.get_ContentSize(), JSONResultSetRow.TYPE_INTEGER, null, null);
And by custom I mean something like this, where everything is loaded from an XML file:
ArrayList<PluginProperty> pr = pxs.getResults(contextId);
for (int i = 0; i < pr.size(); i++) {
String id = "{" + i + "}";
String propName = pr.get(i).getName();
String propType = pr.get(i).getType();
String prop = "";
.
.
.
else if (propType.equalsIgnoreCase("StringList")) {
int size = doc.getProperties().get(propName).getStringListValue().size();
for (int j = 0; j < size; j++) {
prop += doc.getProperties().get(propName).getStringListValue().get(j).toString() + "; ";
}
}
else if (propType.equalsIgnoreCase("StringValue")) {
prop = doc.getProperties().get(propName).getStringValue();
}
.
.
.
row.addAttribute(id, prop, JSONResultSetRow.TYPE_STRING, null, prop);
}

After the document information data is saved, openItem is called. This updates the item with the latest data.
The ContentList gets the cell value from the _ModelStore.js getValue method. This method calls item.getDisplayValue to get the value to display in the cell. Most likely either item.getDisplayValue is returning null (or blank) or _ModelStore's getValue is not being called for this attribute.
I would suggest looking at the JSON being returning from openItem to verify it looks complete.

Finally found the issue, apparently ICN does not want you to use custom IDs for your rows.
I was loading a bunch of rows from an XML file and creating rows like this:
ArrayList<PluginProperty> pr = pxs.getResults(contextId);
for (int i = 0; i < pr.size(); i++) {
String id = "{" + i + "}";
String propName = pr.get(i).getName();
String propType = pr.get(i).getType();
String prop = "";
.
.
.
else if (propType.equalsIgnoreCase("StringList")) {
int size = doc.getProperties().get(propName).getStringListValue().size();
for (int j = 0; j < size; j++) {
prop += doc.getProperties().get(propName).getStringListValue().get(j).toString() + "; ";
}
}
else if (propType.equalsIgnoreCase("StringValue")) {
prop = doc.getProperties().get(propName).getStringValue();
}
.
.
.
row.addAttribute(id, prop, JSONResultSetRow.TYPE_STRING, null, prop);
}
Now to make it work I was forced to change the id variable to:
String id = pr.get(i).getName();
So that the ids will look like "Id", "DocumentTitle", "Creator", "DateCreated" and "DateLastModified", exactly like the name of each property instead of "{0}", "{1}", "{2}", etc.
Hope this might be of help to someone else!

How Get Spooled File list separately from it's format - Java ( JT400 )

I get Spooled list to java using jt400. but i want to get Advanced Spooled file( *.TIFF image formatted Spooled files) list and normal Spooled (Can read Text) file list separately. Anyone know how to do that ?
Thanks in Advance!
try{
AS400 server = new AS400();
System.out.println(" Now receiving all spooled files Synchronously");
SpooledFileList splfList = new SpooledFileList( server );
// set filters, all users, on all queues
splfList.setUserFilter("user");
splfList.setQueueFilter("/QSYS.LIB/%ALL%.LIB/%ALL%.OUTQ");
// open list, openSynchronously() returns when the list is completed.
splfList.openSynchronously();
// Enumeration enum = splfList.getObjects();
Enumeration enumx = splfList.getObjects();
while(enumx.hasMoreElements())
{
SpooledFile splf = (SpooledFile)enumx.nextElement();
if ( splf != null )
{
String Name = splf.getName();
int Number = splf.getNumber();
String jobname = splf.getJobName();
String jobuser = splf.getJobUser();
String jobnumber = splf.getJobNumber();
// strSpooledNumber = splf.getStringAttribute(SpooledFile.)
System.out.println(" spooled file = Name :" + Name + " number : " + Number + " JobName : " + jobname + " job user : " + jobuser + " job Number : " + jobnumber);
}
}
// clean up after we are done with the list
splfList.close();
}
catch( Exception e )
{
e.printStackTrace();
}

The existing class doesn't have a filter on printer device type, although you could add one using getUserFilter as an example.
Once you have the full list of spooled files, you could split them yourself into two groups. Try String prtdevtype = splf.getStringAttribute(ATTR_PRTDEVTYPE);
From this you can tell if you have a text spooled file (*SCS) or one with graphics in it (*IPDS, *AFPDS).

How to check if the subdomain is also from same domain using java

i have a list of url's i need to filter specific domain and subdomain. say i have some domains like
http://www.example.com
http://test.example.com
http://test2.example.com
I need to extract urls which from domain example.com.

Working on project that required me to determine if two URLs are from the same sub domain (even when there are nested domains). I worked up a modification from the guide above. This holds out pretty well thus far:
public static boolean isOneSubdomainOfTheOther(String a, String b) {
try {
URL first = new URL(a);
String firstHost = first.getHost();
firstHost = firstHost.startsWith("www.") ? firstHost.substring(4) : firstHost;
URL second = new URL(b);
String secondHost = second.getHost();
secondHost = secondHost.startsWith("www.") ? secondHost.substring(4) : secondHost;
/*
Test if one is a substring of the other
*/
if (firstHost.contains(secondHost) || secondHost.contains(firstHost)) {
String[] firstPieces = firstHost.split("\\.");
String[] secondPieces = secondHost.split("\\.");
String[] longerHost = {""};
String[] shorterHost = {""};
if (firstPieces.length >= secondPieces.length) {
longerHost = firstPieces;
shorterHost = secondPieces;
} else {
longerHost = secondPieces;
shorterHost = firstPieces;
}
//int longLength = longURL.length;
int minLength = shorterHost.length;
int i = 1;
/*
Compare from the tail of both host and work backwards
*/
while (minLength > 0) {
String tail1 = longerHost[longerHost.length - i];
String tail2 = shorterHost[shorterHost.length - i];
if (tail1.equalsIgnoreCase(tail2)) {
//move up one place to the left
minLength--;
} else {
//domains do not match
return false;
}
i++;
}
if (minLength == 0) //shorter host exhausted. Is a sub domain
return true;
}
} catch (MalformedURLException ex) {
ex.printStackTrace();
}
return false;
}
Figure I'd leave it here for future reference of a similar problem.

I understand you are probably looking for a fancy solution using URL class or something but it is not required. Simply think of a way to extract "example.com" from each of the urls.
Note: example.com is essentially a different domain than say example.net. Thus extracting just "example" is technically the wrong thing to do.
We can divide a sample url say:
http://sub.example.com/page1.html
Step 1: Split the url with delimiter " / " to extract the part containing the domain.
Each such part may be looked at in form of the following blocks (which may be empty)
[www][subdomain][basedomain]
Step 2: Discard "www" (if present). We are left with [subdomain][basedomain]
Step 3: Split the string with delimiter " . "
Step 4: Find the total number of strings generated from the split. If there are 2 strings, both of them are the target domain (example and com). If there are >=3 strings, get the last 3 strings. If the length of last string is 3, then the last 2 strings comprise the domain (example and com). If the length of last string is 2, then the last 3 strings comprise the domain (example and co and uk)
I think this should do the trick (I do hope this wasn't a homework :D )
//You may clean this method to make it more optimum / better
private String getRootDomain(String url){
String[] domainKeys = url.split("/")[2].split("\\.");
int length = domainKeys.length;
int dummy = domainKeys[0].equals("www")?1:0;
if(length-dummy == 2)
return domainKeys[length-2] + "." + domainKeys[length-1];
else{
if(domainKeys[length-1].length == 2) {
return domainKeys[length-3] + "." + domainKeys[length-2] + "." + domainKeys[length-1];
}
else{
return domainKeys[length-2] + "." + domainKeys[length-1];
}
}
}