Writing to file using PrintStream and PrintWriter...

I tried to write a string to a file, it actually ADD the string to the bottom of the text file without deleting what was already in there. at first I use PrintStream, it worked fine when run it from my MS-J++6.0, but it says "PrintStream has been deprecated by the author of java.io.printstream", and when I try to run it from IE it doesn't even work. then I look into the MSDN, it says jdk 1.1 prefer to use PrintWritier, so I change it to PrintWriter, no more error message but now the file only records the last string I entered and deleted all the text I had in there before. and it still doesn't work when I try to run it from IE. And for some reason, the program will creat the text file on my desktop(winXP) instead in the same folder where the java files are....
Please help me understand what's wrong and how to solve it.. thank you. here is my code...
public void storing(String msg)
          PrintWriter ps = null;
          try
               ps = new PrintWriter(new FileOutputStream("collect.txt"), true);
               ps.println(msg);
          catch (IOException e)
               feedback.append("Cannot write to file.");
          finally
               if(ps != null)
                    ps.close();

cuz what I am doing is to have the user input 30 lines of messages, each time a message is written, they press a "next" button then that line of message will be saved to file, then the user can write the next line. I do this becuz I am affraid that the user will close the applet before he finishes all 30 line, if he does that, I still want to get as much line that the user has wrote that's why I have it write to file each time a line is written. So if I open a file at the beginning of the program, will it encounter any problem if the user close the applet without close the file??
thanx.

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Formatting output to a text file (using FileWriter and PrintWriter)

Hi Folks
I am using the bit of code below to save output from a gui to a text file. The data is entered line by line in the form eg,
"one two three four"
"five six seven eight"
I am also reloading this data back in to a TextArea in the GUI for viewing if required. The annoying thing that upon reloading, the data appears in one long line. The TextArea does not offer a line wrapping facilty (well I don't know how to impement it, it exist). Consequently, I would be quite grateful if somone could come come to my assistance. Any of these would graciously appreciated:
1. Forcing the TextArea to word wrap
2. Manually inserting some type of newline character at the end of the outbound
text
3. Or any other procedure you experts can dream up :-)
Cheers
public void actionPerformed(ActionEvent e) {
if (e.getSource() == loadButton) {
getFileDialog = new FileDialog(this,
"Select or enter the name of the file you wish to write to.",
FileDialog.LOAD);
getFileDialog.setDirectory("C:\\Work\\java_tutorials");
getFileDialog.show();
fileName = getFileDialog.getFile();
if(fileName == null) {
return;
directory = getNameBox.getDirectory();
path = directory + fileName;
fileConfirmation.setText(path);
if (e.getSource() == saveButton ) {
try{
outputFile = new PrintWriter( new FileWriter(fileName, true), true);
outputFile.print(inputTextArea.getText() );
outputFile.close();
catch (FileNotFoundException e1) {
return;
catch (NullPointerException e2) {
return;
catch (IOException e3) {
JOptionPane.showMessageDialog(null,
"There was an error in opening this file!");
System.exit(0);
}

'you can use "append()" method...
ex.
// some code here...
inputTxtArea.append(data+"\n"); //<<-- you need to put '\n'
// some code here...

Reading/Writing .xlsx files using Webdynpro for Java

Dear All
I have a requirement to read/write excel files in .xlsx format. I am good in doing it with .xls format using jxl.jar. The jxl.jar doesn't support .xlsx format. Kindly help me in understanding how do I need to proceed on reading/writing .xlsx files using Webdynpro for Java.
Thanks and Regards
Ramamoorthy D

i am using jdk 1.6.22 and IBM WebSphere
when i use poi-3.6-20091214.jar and poi-ooxml-3.6-20091214.jar to read .xlsx file. but i am getting following errors
The project was not built since its classpath is incomplete. Cannot find the class
file for java.lang.Iterable. Fix the classpath then try rebuilding this project.
This compilation unit indirectly references the missing type java.lang.Iterable
(typically some required class file is referencing a type outside the classpath)
how can i resolve it
here is the code that i have used
public class HomeAction extends DispatchAction {
     public ActionForward addpage(
                         ActionMapping mapping,
                         ActionForm form,
                         HttpServletRequest request,
                         HttpServletResponse response)
                         throws Exception {
                         String name = "C:/Documents and Settings/bharath/Desktop/Book1.xlsx";
           FileInputStream fis = null;
           try {
               Object workbook = null;
                fis = new FileInputStream(name);
                XSSFWorkbook wb = new XSSFWorkbook(fis);
                XSSFSheet sheet = (XSSFSheet) wb.getSheetAt(0);
                Iterator rows = sheet.rowIterator();
                int number=sheet.getLastRowNum();
                System.out.println(" number of rows"+ number);
                while (rows.hasNext())
                    XSSFRow row = ((XSSFRow) rows.next());
                    Iterator cells = row.cellIterator();
                    while(cells.hasNext())
                XSSFCell cell = (XSSFCell) cells.next();
                String Value=cell.getStringCellValue();
                System.out.println(Value);
           } catch (IOException e) {
                e.printStackTrace();
           } finally {
                if (fis != null) {
                     fis.close();
            return mapping.findForward("returnjsp");

Want To create Zip file using java,And Unzip without Java Program

I want to create a zip text file using java, I know Using ZipOutputStream , we can create a zip file, , But i want to open that zip file without java program. suppose i use ZipOutputStream , then zip file is created But for unZip also difftrent program require. We cant open that zip file without writing diff java program.
Actually i have one text file of big size want to create zip file using java , and unzip simply without java program.Its Possible??
Here is one answer But I want to open that file normal way(
For Exp. using winzip we can create a zip file and also open simply)
http://forum.java.sun.com/thread.jspa?threadID=5182691&tstart=0

Thanks for your Reply,
I m creating a zip file using this program, Zip file Created successfully But when im trying to open .zip file i m getting error like "Canot open a zip file, it does not appear to be valid Archive"
import java.io.*;
import java.util.zip.*;
public class ZipFileCreation
     public static void main (String argv[])
     try {
     FileOutputStream fos = new FileOutputStream ( "c:/a.zip" );
     ZipOutputStream zip = new ZipOutputStream ( fos );
     zip.setLevel( 9 );
     zip.setMethod( ZipOutputStream.DEFLATED );
//     get the element file we are going to add, using slashes in name.
     String elementName = "c:/kalpesh/GetSigRoleInfo092702828.txt";
     File elementFile = new File ( elementName );
//     create the entry
     ZipEntry entry = new ZipEntry( elementName );
     entry.setTime( elementFile.lastModified() );
//     read contents of file we are going to put in the zip
     int fileLength = (int)elementFile.length();
     System.out.println("fileLength = " +fileLength);
     FileInputStream fis = new FileInputStream ( elementFile );
     byte[] wholeFile = new byte [fileLength];
     int bytesRead = fis.read( wholeFile , 0 /* offset */ , fileLength );
//     checking bytesRead not shown.
     fis.close();
//     no need to setCRC, or setSize as they are computed automatically.
     zip.putNextEntry( entry );
//     write the contents into the zip element
     zip.write( wholeFile , 0, fileLength );
     zip.closeEntry(); System.out.println("Completed");
//     close the entire zip
     catch(Exception e) {
e.printStackTrace();
}

PrintStream and PrintWriter

Hi,
Could anybody tell me the difference between PrintStream and PrintWriter ?
I know that the first one operates on 8 bits streams whereas the second one
on 16 bits streams. Why could the first one not handle Unicodes properly ?
Could anybody give some explanation on that ?
The main purpose for PrintStream is to provide ability to "print representations
of various data values conveniently". So it handles all the data representations
as well as char type which is 16 bit type - so it handles Unicodes - doesn't it ?
If it does - what is the purpose for PrintWriter ?
I got confused here ...
Any links with some technical info about Stream and Writer compared
will be appreciated :)
Thanks,
Adrian

At its most basic, streams write out data and writers write out text. I searched the forum with just these terms -- printstream printwriter -- and got many useful hits. This included this gem:
http://forum.java.sun.com/thread.jspa?forumID=54&threadID=641616

Reading XML file using BAPI and then uploading that xml file data into SAP

I am getting a xml file from Java server. I need to take
data from this file using BAPI and need to upload into SAP using SAP.
Please tell me how to read XML files using BAPI's.

SDIXML_DATA_TO_DOM Convert SAP data (elementary/structured/table types) into DOM (XML
SDIXML_DOM_TO_XML Convert DOM (XML) into string of bytes that can be downloaded to PC or application server
SDIXML_DOM_TO_SCREEN Display DOM (XML)
SDIXML_DOM_TO_DATA
data: it_table like t001 occurs 0.
data: l_dom TYPE REF TO IF_IXML_ELEMENT,
 m_document TYPE REF TO IF_IXML_DOCUMENT,
 g_ixml TYPE REF TO IF_IXML,
 w_string TYPE XSTRING,
 w_size TYPE I,
 w_result TYPE I,
 w_line TYPE STRING,
 it_xml TYPE DCXMLLINES,
 s_xml like line of it_xml,
 w_rc like sy-subrc.
start-of-selection.
select * from t001 into table it_table.
end-of-selection.
initialize iXML-Framework ****
write: / 'initialiazing iXML:'.
class cl_ixml definition load.
g_ixml = cl_ixml=>create( ).
check not g_ixml is initial.
write: 'ok'.
create DOM from SAP data ****
write: / 'creating iXML doc:'.
m_document = g_ixml->create_document( ).
check not m_document is initial.
write: 'ok'.
write: / 'converting DATA TO DOM 1:'.
CALL FUNCTION 'SDIXML_DATA_TO_DOM'
 EXPORTING
 NAME = 'IT_TABLE'
 DATAOBJECT = it_table[]
 IMPORTING
 DATA_AS_DOM = l_dom
 CHANGING
 DOCUMENT = m_document
 EXCEPTIONS
 ILLEGAL_NAME = 1
 OTHERS = 2.
if sy-subrc = 0. write 'ok'.
else. write: 'Err =', sy-subrc.
endif.
check not l_dom is initial.
write: / 'appending DOM to iXML doc:'.
w_rc = m_document->append_child( new_child = l_dom ).
if w_rc is initial. write 'ok'.
else. write: 'Err =', w_rc.
endif.
visualize iXML (DOM) ****
write: / 'displaying DOM:'.
CALL FUNCTION 'SDIXML_DOM_TO_SCREEN'
 EXPORTING
 DOCUMENT = m_document
 EXCEPTIONS
 NO_DOCUMENT = 1
 OTHERS = 2.
if sy-subrc = 0. write 'ok'.
else. write: 'Err =', sy-subrc.
endif.
convert DOM to XML doc (table) ****
write: / 'converting DOM TO XML:'.
CALL FUNCTION 'SDIXML_DOM_TO_XML'
 EXPORTING
 DOCUMENT = m_document
 PRETTY_PRINT = ' '
 IMPORTING
 XML_AS_STRING = w_string
 SIZE = w_size
 TABLES
 XML_AS_TABLE = it_xml
 EXCEPTIONS
 NO_DOCUMENT = 1
 OTHERS = 2.
if sy-subrc = 0. write 'ok'.
else. write: 'Err =', sy-subrc.
endif.
write: / 'XML as string of size:', w_size, / w_string.
describe table it_xml lines w_result.
write: / 'XML as table of', w_result, 'lines:'..
loop at it_xml into s_xml.
 write s_xml.
endloop.
write: / 'end of processing'.
end of code
Hope this will be useful.
regards
vinod

"encoding = UTF-8" missing while writing XML file using file Adapter

Hi,
We are facing an unique problem writing xml file using file adapter. The file is coming without the encoding part in the header of xml. An excerpt of the file that is getting generated:
<?xml version="1.0" ?>
<customerSet>
<user>
<externalID>51017</externalID>
<userInfo>
<employeeID>51017</employeeID>
<employeeType>Contractor</employeeType>
<userName/>
<firstName>Gail</firstName>
<lastName>Mikasa</lastName>
<email>[email protected]</email>
<costCenter>8506</costCenter>
<departmentCode/>
<departmentName>1200 Corp IT Exec 8506</departmentName>
<businessUnit>1200</businessUnit>
<jobTitle>HR Analyst 4</jobTitle>
<managerID>49541</managerID>
<division>290</division>
<companyName>HQ-Milpitas, US</companyName>
<workphone>
<number/>
</workphone>
<mobilePhone>
<number/>
</customerSet>
</user>
So if you see the header the "encoding=UTF-8" is missing after "version-1.0".
Do we need to configure any properties in File Adapter?? Or is it the standard way of rendering by the adapter.
Please advice.
Thanks in advance!!!

System.out.println(nodeList.item(0).getFirstChild().getNodeValue());

How to search for files using wildcards * and ?.

Hi All,
I've been searching the forum for a couple of hours now and have been unable to find a good example of how to search a directory (Windows OS) for a file using wildcards * and/or ?. Does anyone out there have a good example that they can share with me?
Thanks

Hi All,
First of all I want to thank everyone for taking the time to respond to my question. All of your responses where greatly appreciated.
I took the example code that was posted by rkconner, thanks rkconner, and modified it to allow me to search for files in a directory that contain * and/or ?. Yes, I said and/or! Meaning that you can use them both in the same file name, example: r??d*.t* would find readme.txt.
I've posed my complete and thoroughly document code below. I hope it is very helpful to other as I have searched many forums and spent many hours today trying to resolve this problem.
Enjoy
* File Name: WildcardSearch.java
* Date: Jan 9, 2004
* This class will search all files in a directory using the
* asterisk (*) and/or question mark (?) as wildcards which may be
* used together in the same file name. A File [] is returned containing
* an array of all files found that match the wildcard specifications.
* Command line example:
* c:\>java WildcardSearch c:\windows s??t*.ini
* New sWild: s.{1}.{1}t.*.ini
* system.ini
* Command line break down: Java Program = java WildcardSearch
* Search Directory (arg[0]) = C:\Windows
* Files To Search (arg[1]) = s??t*.ini
* Note: Some commands will not work from the command line for arg[1]
* such as *.*, however, this will work if you if it is passed
* within Java (hard coded)
* @author kmportner
import java.io.File;
import java.io.FilenameFilter;
public class WildcardSearch
 private static String sWild = "";
 * @param args - arg[0] = directory to search, arg[1] = wildcard name
 public static void main(String[] args)
 String sExtDir = args[0]; // directory to search
 sWild = args[1]; // wild card to use - example: s??t*.ini
 sWild = replaceWildcards(sWild);
 System.out.println("New sWild: " + sWild);
 File fileDir = new File(sExtDir);
 File[] arrFile = fileDir.listFiles(new FilenameFilter()
 public boolean accept(File dir, String name)
 return (name.toLowerCase().matches(sWild));
 for (int i = 0; i < arrFile.length; ++i)
 System.out.println(arrFile.getName());
 } // end main
 * Checks for * and ? in the wildcard variable and replaces them correct
 * pattern characters.
 * @param wild - Wildcard name containing * and ?
 * @return - String containing modified wildcard name
 private static String replaceWildcards(String wild)
 StringBuffer buffer = new StringBuffer();
 char [] chars = wild.toCharArray();
 for (int i = 0; i < chars.length; ++i)
 if (chars[i] == '*')
 buffer.append(".*");
 else if (chars[i] == '?')
 buffer.append(".{1}");
 else
 buffer.append(chars[i]);
 return buffer.toString();
 } // end replaceWildcards method
} // end class

When moving a file using drag and drop, as I hover over the destination folder it no longer opens, so I can't drop the file into the folder. Why?

When moving a file using drag and drop, as I hover over the destination folder it no longer opens, so I can't drop the file into the folder. Why? I have a heirarchical embedded folder structure under \Documents. Usually, as I drag the file to be moved over the various folders, they will blink twice, then expand/open to reveal contents (in Finder). Now, when the file to be moved is held (hovering) over the destination folder, it will not blink or expand, so there's no place to drop the file. If I release the mouse button, the file image disappears, showing that it is "going back to the place it came from", a.k.a. was not moved. This just started happening. I noticed it after upgrading to Mavericks. Is this a bug or could anything else be causing this?

As of today, Apple Support discovered during a remote support session with me that the same thing happens on their own system. It is isolated to "Column View"; the Icon and List views in Finder behave correctly. Issue is being escalated to engineering, and Apple will call to report status in a couple days. In all likelihood, this is a bug that will need to be addressed in a future update.

Transfering files using drag and drop to Nano P

I havent installed the supplied disks that came with my Nano Plus but am transfering files using drag and drop from "my music" folder on my computer to the Nano. These files are stored on my computer as the Name of the Artist as the folder name with a sub folder named the CD title (default setting when using Windows media to rip) with the individual track files in that folder.
When I drag the main folder over to my Nano it just displays the Album title on the screen but not by artist and there is no way to select by artist (you can just switch "folders" on the Nano which will then display the CD title. If I used the supplied software with my Nano to transfer the files will I be able to choose by artist, CD, Genre, etc or is this not a function of the Nano?
Is it best to just select the individual song tracks and throw them in one large group on the Nano and then it can figure out which artist, album, genre they belong to?

The player will only show directories that contain music files.
The behaviour you want is common on players that manage their content with a database (typically HD-based devices), but Creative's flash players don't work that way (and the software used on the host computer doesn't have any influence on this - the user interface is controlled by the player's firmware).

Last week I found records of purchases for 3 files using itunes, and left money for my credit card, do not make such purchases, what the **** is going on? itunes is not safe?

ast week I found records of purchases for 3 files using itunes, and left money for my credit card, do not make such purchases, what the **** is going on? itunes is not safe?

Contact iTunes support at the link below.
https://ssl.apple.com/emea/support/itunes/contact.html

Writing the file using Write to SGL and reading the data using Read from SGL

Hello Sir, I have a problem using the Write to SGL VI. When I am trying to write the captured data using DAQ board to a SGL file, I am unable to store the data as desired. There might be some problem with the VI which I am using to write the data to SGL file. I am not able to figure out the minor problem I am facing. I am attaching a zip file which contains five files.
1)      Acquire_Current_Binary_Exp.vi -> This is the VI which I used to store my data using Write to SGL file.
2)      Retrive_BINARY_Data.vi -> This is the VI which I used to Read from SGL file and plot it
3)      Binary_Capture -> This is the captured data using (1) which can be plotted using (2) and what I observed is the plot is different and also the time scare is not as expected.
4)      Unexpected_Graph.png is the unexpected graph when I am using Write to SGL and Read from SGL to store and retrieve the data.
5)      Expected_Graph.png -> This is the expected data format I supposed to get. I have obtained this plot when I have used write to LVM and read from LVM file to store and retrieve the data.
I tried a lot modifying the sub VI’s but it doesn’t work for me. What I think is I am doing some mistake while I am writing the data to SGL and Reading the data from SGL. Also, I don’t know the reason why my graph is not like (5) rather I am getting something like its in (4). Its totally different. You can also observe the difference between the time scale of (4) and (5).
Attachments:
Krishna_Files.zip ‏552 KB

The binary data file has no time axis information, it is pure y data. Only the LVM file contains information about t(0) and dt. Since you throw away this information before saving to the binary file, it cannot be retrieved.
Did you try wiring a 2 as suggested?
(see also http://forums.ni.com/ni/board/message?board.id=BreakPoint&message.id=925 )
Message Edited by altenbach on 07-29-2005 11:35 PM
LabVIEW Champion . Do more with less code and in less time .
Attachments:
Retrive_BINARY_DataMOD2.vi ‏1982 KB

NullPointerException Using PrintStream or PrintWriter

Here is the code that I am using. I am taking the output of a program and trying to write that output to a file. When outputting to the file I receive a null pointer exception that I don't know why I am getting. I am using PrintStream here but I also tried using PrintWriter and I got the same error. If I uncomment the System.out.println statement the first line is printed to the console window, but then when it tries to print that line to the file I apparently get the NullPointerException. Can anyone help? Thank you. Here is that bit of code.
p = r.exec(myprogram);
                              InputStream in = p.getInputStream();
                              BufferedReader br = new BufferedReader(new InputStreamReader(in));
                              String line = null;
                              try
                                   PrintStream outFile = new PrintStream(new FileOutputStream("testresults.txt"));
                              catch(FileNotFoundException fe)
                                   System.out.println("File not found: " + fe);
                              while ((line = br.readLine()) != null)
                                   //System.out.println(line);
                                   outFile.println(line);
                              p.waitFor();

I can tell you exactly why... Here's an example
public static void aMethod() {
String s = "Foo";
    String s = "Bar";
System.out.println(s);
}The value output is "Foo" because the 's' declared in the parenthesis is a different variable in it's own scope.
Your code does something similar when you did the following
try {
PrintStream outFile = new PrintStream(new FileOutputStream("testresults.txt"));
} catch(FileNotFoundException fe) {
System.out.println("File not found: " + fe);
}This declares a variable in the scope of the try block and assigns a reference to a new PrintStream object. However this variable ceases to exist immediately following the closing parenthesis of the catch block.
Since your code compiles you must, further up have already declared outFile so I would change the code to
try {
outFile = new PrintStream(new FileOutputStream("testresults.txt"));
} catch(FileNotFoundException fe) {
System.out.println("File not found: " + fe);
outfile = null;
}Note that this means if the exception occurs, outFile will be null. You need to decide what action to take in this situation.
Hope that helps - now put up your Dukes... ;)

Save as swf file using httpconnection and file io

I have one application which is fatch the swf file from web and i want to save as in same to swf file format.
when i have fatch the swf file and save as .swf format i have unable to view as flash animation in browser and micromedia.
Anyone suggest me ?
URL url = new URL("http://nileshpatel.com/abc.swf");
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestProperty( "User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0)" );
BufferedReader rd;
rd = new BufferedReader(new InputStreamReader(con.getInputStream()));
String line="";
String content="";
File f = new File("users/nileshpatel/neo.swf");
FileWriter fw = new FileWriter(f);
while ((line = rd.readLine()) != null) {
content += line;
rd.close();
fw.write(content);
fw.close();
############################################################

BTW sometimes flash uses communication with server to obtain some information before/during running. In such case you'll need to provide kind of your own HTTP server, pass swf to browser using HTTP protocol (not directly from HDD) then pass all additional data.
Hope this is not your case :)

How to upload an html file using jsp and jdbc

Hi,
im trying to upload an html page using JSP and jdbc. but of no success.
my aim is to keep some important html pages in the database.the file size can vary.the file has to be selected from a local machine (through the browser) and uploaded to a remote machine(where the databse resides).
any help/sample code or pointer to any helpful link is appreciated.
thanks in advance
javajar2003

When uploading a file, I use a byte array as a temporary buffer..
So, you should then be able to store the byte array in the
database as binary data.
example>
//Temporary Buffer To Store File
byte[] tmpbuffer = new byte[860];
//Some Code To Upload File...
//File Should Now Be In Byte Array
//Get DB Connection and execute Prepared Statement
Connection con=//GET DB CONNECTION;
String sql=insert into TABLE(page) values(?);
PreparedStatement ps=con.prepareStatement(sql);
ps.setBytes(1,tempbuffer);
ps.executeUpdate();
//Close PS and Free DB Connection
..... and this method looks like you dont even have
to store the file in a byte array, you can just give
it the input stream.
ps.setBinaryStream(int, inputStream, int);
You may have to make several attempts at this. I have
uploaded a file and temporarily stored it in a byte array,
but have never from there stored it in the DB as binary
data.. but this looks like it'll work.
Good Luck!

Writing to file using PrintStream and PrintWriter...

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