🚀 go-pugleaf

For reading a properties file there are easy ways like placing the the
propeties file in a
package with a particular class. Then
particularClass.class.getResourceAsStream("propertyfile.properties") gives you
something to pass to properties.load. But if you also want to be able to write
to the properties file, the only thing I have seen is to use
System.getProperty("java.class.path") and have a scheme of where to expect to
find /write the file.
Here is a routine that we use:

import java.util.StringTokenizer;
import java.io.File;
import java.util.zip.ZipFile;
import java.util.zip.ZipException;
import java.io.IOException;
...
  /**
  *  Return the directory that the Object's class is in + .properties
  *  For example, if the instance parameter is of type Column , and
borland.jbcl.dataset.Column
  *  is found in c:\jbuilder\lib\jbcl2.0.jar, then
  *  this will return c:\jbuilder\lib\Column.properties
  */
  public static String getPathToPropertiesFile(Object instance) {
     return getPathToPropertiesFile(instance.getClass().getName());
  }
  public static String getPathToPropertiesFile(String className) {
    //System.err.println("getPathtoProperties");
    String classpath = System.getProperty("java.class.path");   //NORES
    String pathSeparator = System.getProperty("path.separator");   //NORES
    StringTokenizer tokenizer = new StringTokenizer(classpath, pathSeparator);

    className = className.replace('.', File.separatorChar) ;  //NORES
    int index = className.lastIndexOf(File.separatorChar);
    String classDir = "";
    if (index > 0)    {
      classDir = className.substring(0, index + 1); //NORES
      className = className.substring(index + 1);
    }
    String propertyName = className + ".properties"; //NORES
    className = className + ".class";                //NORES
    String zipEntry = className;
    if (classDir.length() > 0)
      zipEntry = classDir + className;
    zipEntry = zipEntry.replace('\\','/');
    //System.err.println("classDir=" + classDir);
    //System.err.println("className=" + className);
    //System.err.println("zipEntry=" + zipEntry);
    File file;
    String testPath;
    ZipFile zipFile = null;
    while (tokenizer.hasMoreTokens()) {
      testPath = tokenizer.nextToken();
//      System.out.println("Searching " + testPath);
      if ((testPath.length() > 5) &&
          ((testPath.substring(testPath.length() - 4,
testPath.length()).equalsIgnoreCase(".zip")) ||  //NORES
           (testPath.substring(testPath.length() - 4,
testPath.length()).equalsIgnoreCase(".jar")))) { //NORES
        try {
          zipFile = null;
          zipFile = new ZipFile(testPath);
        } catch (ZipException e) {
//        System.out.println("Invalid ZIP file(?): " + testPath);
        } catch (IOException e) {
//        System.out.println("I/O error reading file: " + testPath);
        }

        if ((zipFile != null) && (zipFile.getEntry(zipEntry) != null)) {
          int indexx = testPath.lastIndexOf(File.separatorChar);
          if (!(indexx < 0))
            testPath = testPath.substring(0,indexx + 1);
        //System.out.println("Found: " + testPath + "[" + zipClassName + "]" +
index);
          return testPath + propertyName;
        }
        //System.err.println(zipEntry + " not in " + testPath );
      }
      else {
        if (testPath.charAt(testPath.length() - 1) != File.separatorChar) {
          testPath += File.separator;
        }
        file = new File(testPath + classDir + className);
        if (file.exists()) {
//        System.out.println("Found: " + testPath + className);
          return testPath + classDir + propertyName;
        }
        //System.err.println("not " + testPath + classDir + className);
      }

    }
    System.err.println("not found"); //NORES
    // we should never get here
    return null;
  }


walter b. wrote:

> I'm writing a program My source path and my class path are
> c:\jbuilder2\myprog\.
> I want save customer's preferences into properties file.
>
> Now I don't want insert source path into file propetrie name (because
> when I deploy my program I install into c:\myprog or other path), but
> without path I get file not found exception.
> How can I solve this problem ?
>
> This is my code:
>
> public class Options extends JFrame {
>  Properties prop;
> TextFieldControl textFieldDirArch = new TextFieldControl();
> File f = new File("settaggi.properties");
>  /* jave not funds settaggi.properties, But if I write  new
> File("c:/jbuilder2/myprog/settaggi.properties")  it works. But like
> this I have absolute path
> */
> // etc....
>
> public Options() {
>         try  {
>         jbInit();
>
>         if (!f.isFile())
>         {
>         Msg.warning("Path file  "+f.getPath() + " not found");
>         // Msg my class messagebox
>         return;
>         }
>
>         try {
>         InputStream in = new FileInputStream(f);
>         prop = new Properties();
>         prop.load(in);
>
> textFieldDirArch.setText(prop.put("dir_archivi","d:/archivi").toString());
>         // with this textfield customer can to set archives's path
>         in.close();
>       }
>         catch(Exception eReadProp)
> {Msg.warning(eReadProp.getMessage());}
> }
>
> //....
> void buttonSave_actionPerformed(ActionEvent e) {
>     // scrive nel file
>     try {
>          registra(); // my method for to set properties's keys
>          OutputStream out = new FileOutputStream(f);
>          prop.save(out,"bo");
>          out.flush();
>          out.close();
>          f = null;
>          prop = null;
>          new Setta();
>          this.dispose();
>          }
>     catch(Exception eSaveProp) {Msg.warning("errore nella scrittura
> del file di propriet� "+eSaveProp.getMessage());}
> }