Discussion :

[snetechen]

Bonjour,
Comment mettre à jour un fichier .properties en java,tout en gardant les commentaires (Lignes commençant par un #). Merci

[ Modéré par Bulbo ]
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[bob33]

Il faut que tu commences par ouvrir ton fichier en lecture.
Tu peux ensuite lire ton fichier ligne par ligne et effectuer toutes les mises à jours et modification que tu veux

[bulbo]

Le probleme c'est que la classe Properties ne sauve pas les commentaires du fichier qui a servi a la remplir

Ce que j'ai fait pour pallier a ca, c'est une soluce comme bob te propose ..

Je lis le fichier ligne par ligne, si ma ligne commence par # je l'ecrit tout simplement, si elle commence par une cle, je remplace la ligne par le couple cle/valeur present dans la classe Properties ..

Les cles que je n'ai pas rencontrees dans le fichier, je les ajoute a la fin ..

Bulbo

[nicgando]

Si cela peux t'aider j'ai déjà codé une petite classe utilitaire pour faire des merges de fichiers de propriétés.
Si cela peut aider voici le code des classes que j'utilise



PropertiesMerger:

Code :

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package ...;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Enumeration;
import java.util.Properties;
import java.util.regex.Pattern;
 
import org.apache.log4j.Logger;
 
/**
 * Created on 20 sept. 2006.
 * 
 * @author nicgando<br>
 *         Take two properties files and merge them
 */
 
public class PropertiesMerger {
 
  private static final Logger logger = Logger.getLogger(PropertiesMerger.class);
  private DateFormat svgFormat = new SimpleDateFormat("yyyyMMdd");
  private File file1;
  private File file2;
  private File output;
 
  /**
   * @param file1 must exist
   * @param file2 must exist
   * @param output could not exist; if exist will be overwritten (a backup is
   *          done: *.save_yyyyMMdd)
   * @throws IOException
   */
  public PropertiesMerger(File file1, File file2, File output) throws IOException {
    this.file1 = file1;
    this.file2 = file2;
    this.output = output;
 
    if (!this.file1.exists() || !this.file1.canRead()) {
      logger.error("file1: '" + this.file1 + "' doesn't exist or could not be read");
      throw new IOException("file1: '" + this.file1 + "' doesn't exist or could not be read");
    }
 
    if (!this.file2.exists() || !this.file2.canRead()) {
      logger.error("file2: '" + this.file2 + "' doesn't exist or could not be read");
      throw new IOException("file2: '" + this.file2 + "' doesn't exist or could not be read");
    }
 
    if (this.output.exists()) {
      logger.warn("output file: '" + this.output + "' exist");
      File bckFile = new File(this.output.getAbsoluteFile() + ".save_"
          + this.svgFormat.format(new Date()));
      logger.warn("rename file (" + this.output + ") into " + bckFile);
      if (bckFile.exists()) {
        logger.warn(bckFile.getAbsoluteFile() + " exist: delete it");
        bckFile.delete();
        logger.error("could not delete: '" + bckFile);
        this.output.renameTo(bckFile);
      }
    } else {
      if (!this.output.createNewFile()) {
        logger.error("could not create: '" + this.output);
        throw new IOException("could not create: '" + this.output);
      }
    }
  }
 
  private Properties loadProperties(File f) throws IOException {
    logger.debug("load " + f.getAbsoluteFile() + " properties");
    Properties props = new Properties();
    FileInputStream in = new FileInputStream(f);
    props.load(in);
    FileUtilities.closeStream(in);
    logger.debug("properties are: " + props);
    return props;
  }
 
  private void propertiesSpread(Properties p1, Properties p2, Properties spread) {
    Enumeration enumerator = p1.propertyNames();
    while (enumerator.hasMoreElements()) {
      String key = (String) enumerator.nextElement();
      String value = p2.getProperty(key);
      if (value == null) {
        spread.setProperty(key, p1.getProperty(key));
      }
    }
  }
 
  /**
   * Load the file1 and file2 properties files and compare their properties:
   * <br>
   * <li>All properties from the file1 miss in file2 are copy in the output
   * file</li>
   * <li>All properties from the file2 miss in file1 are copy in the output
   * file</li>
   * <li>All properties present in the file1 and file2 are taken from the file2
   * </li>
   * 
   * @throws IOException
   */
  public void merge() throws IOException {
 
    Properties file1Props = this.loadProperties(this.file1);
    Properties file2Props = this.loadProperties(this.file2);
 
    logger.debug("search source properties which are not in the target properties ...");
    logger.debug("override target properties with source properties ...");
    Properties spread = new Properties();
 
    //optionnal because we will copy file1 into the output
    //this.propertiesSpread(file1Props, file2Props, spread);
 
    this.propertiesSpread(file2Props, file1Props, spread);
    logger.debug("spread between file2 and file1 is: " + spread);
 
    logger.debug("copy the file1 properties in the output file");
    FileUtilities.copy(this.file1, this.output);
 
    Enumeration enumerator = file2Props.propertyNames();
    while (enumerator.hasMoreElements()) {
      String key = (String) enumerator.nextElement();
      String file2Value = file2Props.getProperty(key);
      String file1Value = file1Props.getProperty(key);
      if (!file2Value.equalsIgnoreCase(file1Value)) {
        Pattern pattern = Pattern.compile("\\s*" + key + "\\s*=\\s*" + file1Value + "\\s*");
        String replace = "\n#modify (" + this.svgFormat.format(new Date()) + ") : '" + key + "="
            + file1Value + "'\n" + key + "=" + file2Value;
        SearchAndReplace.execute(this.output, pattern, replace);
      }
    }
 
    if (!spread.isEmpty()) {
      logger.debug("add the poperties spread in the target file");
      FileOutputStream out = new FileOutputStream(this.output, true);
      out.write(("\n\n\n#--- (" + this.svgFormat.format(new Date()) + ") added  ---\n").getBytes());
      enumerator = spread.propertyNames();
      while (enumerator.hasMoreElements()) {
        String key = (String) enumerator.nextElement();
        String value = spread.getProperty(key);
        String line = key + "=" + value;
        logger.info("added: '" + line + "' into the output file");
        out.write((line + "\n").getBytes());
      }
      FileUtilities.closeStream(out);
    }
 
    logger.info("done");
  }
}

SearchAndReplace:

Code :

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package ...;
 
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
import org.apache.log4j.Logger;
 
/**
 * Created on 25 sept. 2006.
 * 
 * @author nicgando
 */
 
public class SearchAndReplace {
 
  private static final Logger logger = Logger.getLogger(SearchAndReplace.class);
 
  public static void execute(File srcFile, Pattern search, String replace) {
 
    logger.info("search '" + search.pattern() + "' and replace by '" + replace + "' in " + srcFile);
 
    InputStream ins = null;
    InputStreamReader inr = null;
    BufferedReader br = null;
 
    OutputStream outs = null;
    OutputStreamWriter outw = null;
    BufferedWriter bw = null;
 
    try {
 
      logger.debug("create tmp file ...");
      File tmpFile = new File("searchNreplace.tmp");
 
      if (!tmpFile.exists() && !tmpFile.createNewFile()) {
        throw new IOException("could not create the tmp file: " + tmpFile);
      }
      logger.debug("create tmp file done " + tmpFile);
 
      outs = new FileOutputStream(tmpFile, false);
      outw = new OutputStreamWriter(outs);
      bw = new BufferedWriter(outw);
 
      ins = new FileInputStream(srcFile);
      inr = new InputStreamReader(ins);
      br = new BufferedReader(inr);
 
      logger.debug("start search and replace ...");
      String line = br.readLine();
      String result = "";
      while (line != null) {
        Matcher m = search.matcher(line);
        result = m.replaceAll(replace);
        bw.write(result + "\n");
        line = br.readLine();
      }
 
      logger.debug("start search and replace done");
      logger.debug("close all streams");
 
      FileUtilities.closeStream(br);
      FileUtilities.closeStream(inr);
      FileUtilities.closeStream(ins);
 
      FileUtilities.closeStream(bw);
      FileUtilities.closeStream(outw);
      FileUtilities.closeStream(outs);
 
      logger.debug("rename " + tmpFile);
      if (!srcFile.delete()) {
        throw new IOException("could not delete " + srcFile);
      }
      if (!tmpFile.renameTo(srcFile)) {
        throw new IOException("could not rename " + tmpFile + " to " + srcFile);
      }
 
    } catch (IOException ioe) {
      logger.error(ioe.getMessage(), ioe);
 
      logger.error("close all streams");
 
      FileUtilities.closeStream(ins);
      FileUtilities.closeStream(inr);
      FileUtilities.closeStream(br);
 
      FileUtilities.closeStream(outs);
      FileUtilities.closeStream(outw);
      FileUtilities.closeStream(bw);
    }
  }
}

et FileUtilities

Code :

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package ...;
 
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
 
/**
 * Created on 25 sept. 2006.
 * 
 * @author nicgando<br/>
 */
 
public class FileUtilities {
 
  public static void closeStream(InputStream in) {
    if (in != null)
      try {
        in.close();
      } catch (IOException ioe) {
        //nothing todo
      }
  }
 
  public static void closeStream(BufferedReader br) {
    if (br != null)
      try {
        br.close();
      } catch (IOException ioe) {
        //nothing todo
      }
  }
 
  public static void closeStream(InputStreamReader inr) {
    if (inr != null)
      try {
        inr.close();
      } catch (IOException ioe) {
        //nothing todo
      }
  }
 
  public static void closeStream(OutputStream out) {
    if (out != null) {
      try {
        out.flush();
        out.close();
      } catch (IOException ioe) {
        //nothing todo
      }
    }
  }
 
  public static void closeStream(OutputStreamWriter outw) {
    if (outw != null)
      try {
        outw.flush();
        outw.close();
      } catch (IOException ioe) {
        //nothing todo
      }
  }
 
  public static void closeStream(BufferedWriter bw) {
    if (bw != null)
      try {
        bw.flush();
        bw.close();
      } catch (IOException ioe) {
        //nothing todo
      }
  }
 
  public static void copy(File src, File tgt) throws IOException {
    InputStream in = new FileInputStream(src);
    OutputStream out = new FileOutputStream(tgt);
 
    byte[] buf = new byte[1024];
    int len;
    while ((len = in.read(buf)) > 0) {
      out.write(buf, 0, len);
    }
 
    FileUtilities.closeStream(in);
    FileUtilities.closeStream(out);
  }
}