How to copy a file from Java code

I have written a file through Java code in folder, say, "A". Now, I want a copy of that file exactly the same in some other folder "B". How, it can be done?

http://java.sun.com/docs/books/tutorial/essential/io/streams.html

Similar Messages

How to Generate XML File from Java Code.

I want to generate the xml file from the java code.
Could you plz suggest any webSite address with example?

Here is the code
import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.FactoryConfigurationError;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
public class CreateXML {
     private DocumentBuilderFactory factory = null;
     private DocumentBuilder builder = null;
     private Document document = null;
     public CreateXML() {
          try {
               factory = DocumentBuilderFactory.newInstance();
               builder = factory.newDocumentBuilder();
               document = builder.newDocument();
          } catch (FactoryConfigurationError e) {
               e.printStackTrace();
          } catch (ParserConfigurationException e) {
               e.printStackTrace();
     /** Creates the document for xml. */
     public Document createDocument(){
          try{
               Element root = document.createElement("Root");
               Element child = document.createElement("child");
               root.appendChild(child);
               document.appendChild(root);
          }catch(RuntimeException e){
               e.printStackTrace();
          return document;
     /** Saves the document as xml. */
     public void saveDocument(Document document){
          try{
               TransformerFactory transFactory = TransformerFactory.newInstance();
               Transformer transformer = transFactory.newTransformer();
               DOMSource source = new DOMSource(document);
               StreamResult stream = new StreamResult(new File("sample.xml"));
               transformer.transform(source, stream);
               System.out.println("XML Created !!");
          }catch(TransformerConfigurationException e){
               e.printStackTrace();
          } catch (TransformerException e) {
               e.printStackTrace();
     public static void main(String args[]){
          CreateXML createXML = new CreateXML();
          Document document = createXML.createDocument();
          createXML.saveDocument(document);
}

How to call a .bat file from java code?

How to call a .bat file from java code? and how can i pass parameters to that .bat file?
Thanks in advance

thanks for ur reply
but still i am getting the same error.
I am trying to run a .bat file of together tool, my code looks like below
import java.lang.Runtime;
import java.lang.Process;
import java.io.File;
class SysCall{
     public static void main(String args[]){
          String cmd="D://Borland//Together6.2//bin//Together.bat -script:com.togethersoft.modules.qa.QA -metrics out:D://MySamples//Metrics// -fmt:html D://Borland//Together6.2//samples//java//CashSales//CashSales.tpr";
          //String path="D://Borland//Together6.2//bin//Together.bat ";
          Runtime r= Runtime.getRuntime(); //Declare the system call
          try{
               System.out.println("Before batch is called");
               Process p=r.exec(cmd);
               System.out.println(" Exit value =" + p.exitValue());
               System.out.println("After batch is called");
          /*can produce errors which must be caught*/
          catch(Exception e) {
               e.printStackTrace();
               System.out.println (e.toString());
I am getting the below exception
Before batch is called
java.lang.IllegalThreadStateException: process has not exited
at java.lang.Win32Process.exitValue(Native Method)
at SysCall.main(SysCall.java:17)
java.lang.IllegalThreadStateException: process has not exited

How to modify an existing xml file from java code.

Hi
I have worked on creating a new xml file from java code using xmlbeans.But if i try to modify an already existing file using java code I am unable to get errorfree xmlfile.
For example if xml file(studlist.xml) is as below:
<?xml version="1.0" encoding="UTF-8"?>
<StudentList xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="D:\kchaitanya\xmlprac1\abc\Studlist.xsd">
     <Student>
          <Name>ram</Name>
          <Age>27</Age>
     </Student>
<Student>
          <Name>sham</Name>
          <Age>26</Age>
     </Student>
</StudentList>
Now suppose i have set name to victor using student.setName,
and set age to 20 using setAge from javacode,
the new xml file is as follows:
<?xml version="1.0" encoding="UTF-8"?>
<StudentList xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="D:\kchaitanya\xmlprac1\abc\Studlist.xsd">
     <Student>
          <Name>ram</Name>
          <Age>27</Age>
     </Student>
<Student>
          <Name>sham</Name>
          <Age>26</Age>
     </Student>
</StudentList>
<Student>
          <Name>victor</Name>
          <Age>20</Age>
     </Student>
As observed this is not a valid xml file.But how can i modify without any errors?

I know it's an old post, but I found this while doing a google search for something else, and don't like to leave it un-aswered
Just in case anyone has a similar problem... In this case the new elements have been appended outside of the root element
What you need to do is first get the root element and then append the new children to that, there are several ways of getting the root element, which depend on what you want to do with the elements you get back here's a simple (incomplete) way.
// gets the root element of the specified file (code not shown)
Element rootElement= new SAXReader().read(file).getRootElement();Then just append the new elements as below (this is non-generic code and would need to be modified for your situation)
// write a new student element
Element student = document.createElement("Student"); // creates the new student
rootElement.appendChild(student); // ***appends it to the root element***
Element name = document.createElement("Name"); // creates the name element
name.appendChild(document.createTextNode("Fred")); // adds the name text to the name element
student.appendChild(name); // appends the name to the student
Element age= document.createElement("Age"); // creates the age element
age.appendChild(document.createTextNode("26")); // adds the age text to the age element
student.appendChild(age); // appends the name to the studentThen flush ya buffers or whatever and write the file
Edited by: Dream-Scourge on Apr 23, 2008 11:10 AM

Generation of xml file from java code

hi,
I want to manipulate data in a xml file with java code.I have read data from xml file and also changed it. But i am unable to covert it again in xml file from java code. Can you please tell me how i can do this?

Let me know which parser are you using currently for reading xml files so that i assist you. For now, you can refer to STAX Parser API under this link
http://java.sun.com/webservices/docs/1.6/tutorial/doc/SJSXP3.html

Starting exetutable java file from java code

Hi I was wondering how I can start a executable java file from java code?
thanks

Hi Mkaveli,
Yes, it's possible. If you have a JAR executable, you've just to call the main method of its starter class. For a simple executable class, just call its main method.
This way :
SomeStarter.main(null); // if there's no argumentSmall precision : the executable JAR or class must be specified in the classpath of your application.

Does anyone know how to copy my files from my ipod to a different computer?

Does anyone know how to copy my files from my ipod to a different computer? I tried to do it, but all that it did was erase my files. What i want to to is use my ipod to transfer my files to another computer (which has itunes as well) PLEASE help!

You will need to enable your iPod for disk use. Then, you should see your iPod in "My Computer" and you can open up your iPod's folder there and drag the files into it. You can store the files on the iPod, then connect it to the other computer and drag-and-drop them from the iPod into the designated directory in that computer. Make sure individual files are not larger than 4 GB.

How to copy pdf files from computer to ipad

how to copy pdf files from computer to ipad

You can PDFs to the iPad, but first you need one or more apps on the iPad that supports PDFs - unlike a 'normal' computer the iPad doesn't have a file system, and everything on it has to be associated with an app.
Options include free apps such as Apple's iBooks app and also Adobe Reader - and paid-for apps such as GoodReader (which also supports read-only of other documents types).
For iBooks you can first add the PDFs to your computer's iTunes via File > Add To Library, and you can then sync them by selecting the iPad on the left-hand sidebar of your computer's iTunes (on iTunes 11 you can enable the sidebar via option-command-S on a Mac, control-S on a PC) and using the Books tab on the right-hand side to select and sync them.
For Adobe Reader adnd GoodReader you can use the file sharing on the Apps tab on the right-hand side to copy them over : http://support.apple.com/kb/ht4094

How to pass arguments to a batch file from java code

Hi
I have a batch file (marcxml.bat) which has the following excerpt :
@echo off
if x==%1x goto howto
java -cp C:\Downloads\Marcxml\marc4j.jar; C:\Downloads\Marcxml\marcxml.jar; %1 %2 %3
goto end
I'm calling this batch file from a java code with the following line of code:
Process p = Runtime.getRuntime().exec("cmd /c start C:/Downloads/Marcxml/marcxml.bat");
so ,that invokes the batch file.Till that point its ok.
since the batch file accpets arguments(%1 %2 %3) how do i pass those arguments to the batch file from my code ...???
%1 is a classname : for ex: gov.loc.marcxml.MARC21slim2MARC
%2 is the name of the input file for ex : C:/Downloads/Marcxml/source.xml
%3 is the name of the output file for ex: C:/Downloads/Marcxml/target.mrc
could someone help me...
if i include these parameters too along with the above line of code i.e
Process p = Runtime.getRuntime().exec("cmd /c start C:/Downloads/Marcxml/marcxml.bat gov.loc.marcxml.MARC21slim2MARC C:\\Downloads\\Marcxml\\source.xml C:\\Downloads\\Marcxml\\target.mrc") ;
I get the following error :
Exception in thread main java.lang.Noclassdef foundError: c:Downloads\marcxml\source/xml
could some one tell me if i'm doing the right way in passing the arguments to the batch file if not what is the right way??
Message was edited by:
justunme1

1 - create a java class (Executer.java) for example:
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class Executer {
     public static void main(String[] args) {
          try {
               for (int i = 0; i < args.length; i++) {
                    System.out.println(args);
               Class<?> c = Class.forName(args[0]);
               Class[] argTypes = new Class[] { String[].class };
               Method main = c.getDeclaredMethod("main", argTypes);
               // String[] mainArgs = Arrays.copyOfRange(args, 1, args.length); //JDK 6
               //jdk <6
               String[] mainArgs = new String[args.length - 1];
               for (int i = 0; i < mainArgs.length; i++) {
                    mainArgs[i] = args[i + 1];
               main.invoke(null, (Object) mainArgs);
               // production code should handle these exceptions more gracefully
          } catch (ClassNotFoundException x) {
               x.printStackTrace();
          } catch (NoSuchMethodException x) {
               x.printStackTrace();
          } catch (IllegalAccessException x) {
               x.printStackTrace();
          } catch (InvocationTargetException x) {
               x.printStackTrace();
          } catch (Exception e) {
               e.printStackTrace();
2 - create a .bat file:
@echo off
java -cp C:\Downloads\Marcxml\marc4j.jar; C:\Downloads\Marcxml\marcxml.jar; Executer %TARGET_CLASS% %IN_FILE% %OUT_FILE%3 - use set command to pass variable:
Open MS-DOS, and type the following:
set TARGET_CLASS=MyTargetClass
set IN_FILE=in.txt
set OUT_FILE=out.txt
Then run your .bat file (in the same ms dos window)
Hope that Helps

How to copy a file from one folder to another folder in Linux

Hello everyone,
Oracle forms 11g 11.1.2.0.0
OS: Oracle Linux
We use webutil to upload files to the application server from the client machine, and stores them in a folder named JOB_DOCS on the application server (This folder is created as a databse directory too). File types are JPEG, GIF, PDF, TXT, BMP, DOC, XLS etc...
At a later stage when the user tries to view the uploaded documents, this was not getting displayed on the screen
on our windows server, when the user clicks on the print button we copy the file from the JOB_DOCS folder to the forms\java folder using the below command
HOST('COPY ' ||d:\JOB_DOCS\test.pdf||' '||'c:\oracle\middleware\as\forms\java\test.pdf ,NO_SCREEN);
once the file is under the forms\java folder then it is getting displayed on the screen to print or save, and later we remove the file from forms\java folder.
But my problem here is, recently we have installed our application on Oracle Linux server, and we have JOB_DOCS folder there, and the users can upload files to this folder also. How can we copy the file test.pdf from JOB_DOCS to forms/java in linux?
And what could be the reson for the document cannot be accessed from the folder where it is saved? We tried giving folder permissions, adding the folder to PATH variable etc.

For copying and moving directories you can use the cp and mv commands just like you use them with files. Yeah, I know. If you've already tried to copy a directory with cp, you've probably noticed that cp just complains at you. Probably it says something like cp: omitting directory yadda yadda. You see, the cp command wants you to use the -r option if you want to copy a directory with its contents. The -r means "copy recursively":
$ cp -r dir1 dir2
The above creates a directory named dir2 whose contents will be identical to dir1. However, if dir2 already exists, nothing will be overwritten: the directory dir1 will be copied into the dir2 directory under the name dir2/dir1.
When renaming directories, you use the mv command exactly the same way as with files:
$ mv dir1 dir2
When dealing with directories, mv works a bit like cp does. If dir2 doesn't exist, the above will rename dir1 to dir2, but if dir2 exists, the directory dir1 will be moved into the dir2 directory under the name dir2/dir1.
ref http://www.tuxfiles.org/linuxhelp/dirman.html

OpenScript/How to add .jar file to Java Code in relative path

Hi all,
I want to add a .jar file which can be executed separately (like "java -jar A.jar") to my recorded Java Code.I've read this wiki http://everest2.us.oracle.com/wiki/Generic_JAR_Project about how to add a .jar file to "Assets", however, I cannot figure out how to use the .jarr file in Java code,I mean , how to get this .jar file like the method the databank added in "Assets"?
Things I did are as followed:
1.Execute my .jar file in OpenScript Java code with absolute path like this:
String cmd = "C:\Users\A.jar";
Runtime.getRuntime().exec(cmd);
This does work, but must set a absolute path in Java code like "C:\User\A.jar" ,which is not the workaround I want (I need my scripts can be run on other machines).
2.Try to get its current path with following codes:
File directory = new File(".");
String currentPath=directory.getCanonicalPath();
However,though this can get its absolute path (which is the the project path) in Eclipse like "C:\Users\Workspace\testProject", this only gets "C:\OracleATS\openScript" in OpenScript.
I thought to copy my .jar file to the project path , got its current path in java code first,then can know the path of .jar file, but this workaround failed because of the above reason.
I notice that in the "Assets" there are "Databanks","Object Libraries","JAR Files","Scripts". Since the databanks and scripts that added to "Databanks" and "Scripts" can be got or run in Java Code like:
*getDatabank("DatabankName").getNextDatabankRecord(); String data = eval("{{db.DatabankName.data}}");*
*or getScript("ScriptName").run();*
*Is there a method to get and run the jar file added to "Assets\JAR Files" like the above?*
Thank you very much!
Regards,
Angyoung

Hi DM,
Thanks for your reply!
I've found a workaround,which is calling OpenScript's APIs ,such as this.getScriptPackage().getRepository() and this.getScriptPackage().getWorkspace(),etc to locate the .jar file.
And this workaround can still work even though the script is run on other machine.
Sorry to reply you so late!
Regards,
Angyoung

Running a jar file from java code

Hi!
Im trying to run a jar file from my code.
I've tried Classloader, but that doesnt work because it doesnt find the images (also embedded in the 2nd jar file).
WHat I would like to do is actually RUN the 2nd jar file from the first jar file. There must be a way to do this right?
any ideas?

ok, I found some wonderful code (see below) that will try to start the jar. But it doesn't. What it does is produce the following error when my application runs...
So it's not finding the images in the jar file that I am trying to run? Strange. I checked the URL that sending, but it seems ok....
I think I will check the url again to make sure......
any ideas?
Uncaught error fetching image:
java.lang.NullPointerException
     at sun.awt.image.URLImageSource.getConnection(Unknown Source)
     at sun.awt.image.URLImageSource.getDecoder(Unknown Source)
     at sun.awt.image.InputStreamImageSource.doFetch(Unknown Source)
     at sun.awt.image.ImageFetcher.fetchloop(Unknown Source)
     at sun.awt.image.ImageFetcher.run(Unknown Source)
the code....
/* From http://java.sun.com/docs/books/tutorial/index.html */
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.net.JarURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.jar.Attributes;
* Runs a jar application from any url. Usage is 'java JarRunner url [args..]'
* where url is the url of the jar file and args is optional arguments to be
* passed to the application's main method.
public class JarRunner {
public static void main(String[] args) {
    URL url = null;
    try {
      url = new URL(args[0]);//"VideoTagger.jar");
    } catch (MalformedURLException e) {
      System.out.println("Invalid URL: ");
    // Create the class loader for the application jar file
    JarClassLoader cl = new JarClassLoader(url);
    // Get the application's main class name
    String name = null;
    try {
      name = cl.getMainClassName();
    } catch (IOException e) {
      System.err.println("I/O error while loading JAR file:");
      e.printStackTrace();
      System.exit(1);
    if (name == null) {
      fatal("Specified jar file does not contain a 'Main-Class'"
          + " manifest attribute");
    // Get arguments for the application
    String[] newArgs = new String[args.length - 1];
    System.arraycopy(args, 1, newArgs, 0, newArgs.length);
    // Invoke application's main class
    try {
      cl.invokeClass(name, newArgs);
    } catch (ClassNotFoundException e) {
      fatal("Class not found: " + name);
    } catch (NoSuchMethodException e) {
      fatal("Class does not define a 'main' method: " + name);
    } catch (InvocationTargetException e) {
      e.getTargetException().printStackTrace();
      System.exit(1);
private static void fatal(String s) {
    System.err.println(s);
    System.exit(1);
* A class loader for loading jar files, both local and remote.
class JarClassLoader extends URLClassLoader {
private URL url;
   * Creates a new JarClassLoader for the specified url.
   * @param url
   *            the url of the jar file
public JarClassLoader(URL url) {
    super(new URL[] { url });
    this.url = url;
   * Returns the name of the jar file main class, or null if no "Main-Class"
   * manifest attributes was defined.
public String getMainClassName() throws IOException {
    URL u = new URL("jar", "", url + "!/");
    JarURLConnection uc = (JarURLConnection) u.openConnection();
    Attributes attr = uc.getMainAttributes();
    return attr != null ? attr.getValue(Attributes.Name.MAIN_CLASS) : null;
   * Invokes the application in this jar file given the name of the main class
   * and an array of arguments. The class must define a static method "main"
   * which takes an array of String arguemtns and is of return type "void".
   * @param name
   *            the name of the main class
   * @param args
   *            the arguments for the application
   * @exception ClassNotFoundException
   *                if the specified class could not be found
   * @exception NoSuchMethodException
   *                if the specified class does not contain a "main" method
   * @exception InvocationTargetException
   *                if the application raised an exception
public void invokeClass(String name, String[] args)
      throws ClassNotFoundException, NoSuchMethodException,
      InvocationTargetException {
    Class c = loadClass(name);
    Method m = c.getMethod("main", new Class[] { args.getClass() });
    m.setAccessible(true);
    int mods = m.getModifiers();
    if (m.getReturnType() != void.class || !Modifier.isStatic(mods)
        || !Modifier.isPublic(mods)) {
      throw new NoSuchMethodException("main");
    try {
      m.invoke(null, new Object[] { args });
    } catch (IllegalAccessException e) {
      // This should not happen, as we have disabled access checks
}

How to copy a file from application server to local system

Guys,
Need to copy a file from application server to local system.Is there an FM for the same.
Tried searching for it but couldn't find anything useful.
Code snippets will be highly appreciated.
Warm Regards,
P.
Moderator message: very frequently asked and answered question, obviously you did not search thoroughly, all points removed.
Edited by: Thomas Zloch on Dec 3, 2010 4:48 PM

hi,
You can use the transactions CG3Y or through program u can do like this..
DATA: BEGIN OF IT_FILE OCCURS 0,
                LINE TYPE STRING,
           END OF IT_FILE.
OPEN DATASET <file_name> FOR INPUT IN TEXT MODE ENCODING DEFAULT.
        IF SY-SUBRC IS INITIAL.
          DO.
            READ DATASET<file_name> INTO IT_FILE-LINE.
            IF SY-SUBRC = 0.
              APPEND IT_FILE.
              CLEAR IT_FILE.
            ELSE.
              EXIT.
            ENDIF.
          ENDDO.
        ENDIF.
CLOSE DATASET <file_name>.
Download it to local system using FM - GUI_DOWNLOAD

How to copy a file from one PC to another in ABAP program

Hello Friends,
I have a requirement where I have to copy a file from a central location ( central servers like
inblr102 or
dwdf ) and save it on local PC in ABAP code. Also, while saving it should ask for the path on PC. Can any of you please help me in this?
Thanks in advance!
Divya

Hi,
Check out this link. This deletes file, probally you will get some hint to copy.:
https://www.sdn.sap.com/irj/scn/wiki?path=/display/abap/deleting%252bfile%252bfrom%252bwindows
Thanks,
Krishna

How to call external files from java?

How to call external files in java. For example how to call a *.pdf file to open in its default editor(say Acrobat), or a *.html file to open in the default browser or a *.txt file in a notepad etc..,
In my program i have *.chm (Compiled Windows HTML Help) help file. how to open it in its default editor it?

Jayarathina_Madharasan wrote:
no one answered my questionHi what wrong did i do...basically insulted all the volunteers here who took the time to consider your question and try to offer you help. Other than that, you did nothing wrong.
From JavaRanch :
And even if an answer doesn't solve your problem, even if it should totally miss the point - the best thing to do to motivate others to continue trying to help you is showing respect and gratitude for the investment of time that was put into dealing with your issue.
Edited by: Encephalopathic on Apr 14, 2008 10:01 AM

How to copy a file from Java code

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