Raspberry Pi 3 – Java – Un projet conséquent

 import java.io.BufferedReader;
 import java.io.FileNotFoundException;
 import java.io.FileReader;
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.util.HashMap;
 import java.util.Map;

public class ConfigParam {
  private String paramFile = null;
  private boolean withPrint = false;

private Map<String, String> configParamMap = null;

public ConfigParam(String paramFile, boolean withPrint) {
  this.paramFile = paramFile;
  this.withPrint = withPrint;

  configParamMap = new HashMap<String, String>();
 }

/**
 * Read the configuration parameters for the SystemControl application
 *
 * @return 0 (ok) or different error cases
 */
 public boolean readConfig() {
   BufferedReader br = null;
   try {
     br = new BufferedReader(new FileReader(paramFile));
   }
   catch (FileNotFoundException e) {
     if (withPrint) {
       System.out.println("File " + paramFile + " does not exist");
       System.exit(-1);
     }

     return false;
   }

   String line = null;
   for (;;) {
     try {
       line = br.readLine();
     }
     catch (IOException e) {
       break;
    
   }

   if (line == null) {
     break;
   }

   line = line.replace("\t"," "); //No tabs
   line = line.replace(" ",""); //No spaces at all

   int indexSep = line.indexOf('=');
   int indexSemiCol = line.indexOf(';'); //Position of the comment if any

   if ((indexSep > 0) && (indexSemiCol > 0)) {
     String key = line.substring(0, indexSep);
     String value = line.substring(indexSep + 1, indexSemiCol);
     configParamMap.put(key, value);
   }

   //In this way line without parameters are ignored (doc or other info)
 }

 try {
   br.close();
 }
 catch (IOException e) {
   return false;
 }

 if (configParamMap.size() == 0) {
   if (withPrint) {
     System.out.println("File " + paramFile + " is empty");
   }
   return false; //Empty file
 }

   return true;
 }

public int getInt(String parameter) {
  String value = (String)configParamMap.get(parameter);
  if (value == null) {
    return -2; //No such parameter
  }

  try {
    return Integer.parseInt(value);
  }
  catch(Exception e) {
    return -3; //Invalid value
  }
 }

 public String getString(String parameter) {
  String value = (String)configParamMap.get(parameter);
  return value; //Null if not exist
 }

 public boolean getBoolean(String parameter) {
   String value = (String)configParamMap.get(parameter);
   if (value == null) {
     return false;
   }

   if (value.toLowerCase().compareTo("true") == 0) {
     return true;
   }

   return false;
 }

/**
 * Change the value in one parameter
 *
 * @param parameter
 * @param value
 */
 public void setValue(String parameter, String value) {
   for (Map.Entry<String, String> entry : configParamMap.entrySet()) {
     if (entry.getKey().compareTo(parameter) == 0) {
       entry.setValue(value); //In the map
       break;
     }
   }
 }

public boolean saveConfig() {
  StringBuffer strBuf = new StringBuffer();

  BufferedReader br = null;
  try {
    br = new BufferedReader(new FileReader(paramFile));
  }
  catch (FileNotFoundException e) {
    if (withPrint) {
       System.out.println("File " + paramFile + " does not exist");
    }

   return false;
 }

 String line = null;
 for (;;) {
   try {
     line = br.readLine();
   }
   catch (IOException e) {
     break;
 }

 if (line == null) {
   break;
 }

 int indexSemiCol = line.indexOf('='); //Position of the comment if any
 if (indexSemiCol > 0) {
   String key = line.substring(0, indexSemiCol).trim(); //The parameter
   String value = (String)configParamMap.get(key); //The value change at runtime

   String comment = line.substring(line.indexOf(';') + 1);

   String firstPart = key + "=" + value;
   strBuf.append(firstPart);

   for (int i = firstPart.length(); i < 25; i++) {
     strBuf.append(" ");
   }

   strBuf.append(";" + comment + "\n");
 }

 //In this way line without parameters are ignored (doc or other info)
 }

 try {
   br.close();
 }
 catch (IOException e) {
   return false;
 }

PrintWriter out;
 try {
   out = new PrintWriter(paramFile);
 }
 catch (FileNotFoundException e) {
   return false;
 }

 out.println(strBuf);
 out.close();

 return true;
}

public Map<String, String> getParamMap() {
  return configParamMap;
}

public static void main(String[] args) {
  ConfigParam cfgPara = new ConfigParam("config.txt", true);
  cfgPara.readConfig();

  Map<String, String> theConfigParamMap = cfgPara.getParamMap();
  theConfigParamMap.forEach((k,v)->System.out.println("Param: " + k + " \tValue : " + v));
 }
}