File apps example

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This is AppendDateToFileName.java file having the source code to execute business logic.

/**  *   */ package com.cv.java.file; import java.text.SimpleDateFormat; import java.util.Date; /**  * @author Chandra Vardhan  *  */ public class AppendDateToFileName {   /**    * @param args    */   public static void main(String[] args) {     String name = "test log file_take.xlsx";     String name2 = "test_log.file_take.csv";     String name3 = "test_log.file_take.xls";     String name4 = "test_log.file_take.txt";     String dateStr = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS").format(new Date());     dateStr = dateStr.replaceAll(":", "_");     dateStr = dateStr.replaceAll("-", "_");     dateStr = dateStr.replaceAll("\\.", "_");          System.out.println(modifyFileName(name, dateStr));     System.out.println(modifyFileName(name2, dateStr));     System.out.println(modifyFileName(name3, dateStr));     System.out.println(modifyFileName(name4, dateStr));   }   private static String modifyFileName(String name, String dateStr) {     String perparedFileName = name;     if (name != null) {       int lastIndexOfDot = name.lastIndexOf(".");       String firstPart = name.substring(0, lastIndexOfDot);       String secondPart = name.substring(lastIndexOfDot + 1, name.length());       if (firstPart != null && secondPart != null) {         perparedFileName = firstPart + "_" + dateStr + "." + secondPart;       }     }     return perparedFileName;   } }

This is FilesModifiedLastFewDays.java file having the source code to execute business logic.

/**  *   */ package com.cv.java.file; import java.io.File; import java.io.IOException; import java.util.ArrayList; import java.util.Calendar; import java.util.Date; import java.util.List; import java.util.Scanner; /**  * @author Chandra Vardhan  *  */ public class FilesModifiedLastFewDays {   private List<String> resultFileList = new ArrayList<String>();   /**    * @param args    */   public static void main(String[] args) {     Date currentDate = new Date();     Calendar cal = Calendar.getInstance();     cal.setTime(currentDate);     Scanner scanner = null;     Scanner scanner2 = null;     try {       System.out.println("Please enter how many days files looking for : ");       scanner = new Scanner(System.in);       int days = scanner.nextInt();       System.out.println("Please enter folder to fetch last " + days + "  files : ");       scanner2 = new Scanner(System.in);       String path = scanner2.nextLine();       cal.add(Calendar.DAY_OF_MONTH, -days);       Date alertDate = cal.getTime();       FilesModifiedLastFewDays files = new FilesModifiedLastFewDays();       File directory = new File(path);       List<String> readFiles = files.readFiles(directory, alertDate);       System.out.println(readFiles.size());     } catch (Exception e) {     } finally {       if (scanner != null) {         scanner.close();       }       if (scanner2 != null) {         scanner2.close();       }     }   }   public List<String> readFiles(final File directory, Date lastDays) {     try {       if (directory != null) {         File[] listFiles = directory.listFiles();         if (listFiles != null) {           for (File file : listFiles) {             if (file != null) {               if (file.isDirectory()) {                 readFiles(file, lastDays);               } else {                 boolean lastModified = getLastModified(file, lastDays);                 if (lastModified) {                   resultFileList.add(file.getAbsolutePath());                 }               }             }           }         }       }     } catch (Exception e) {       e.printStackTrace();     }     return resultFileList;   }   public static boolean getLastModified(final File dir, final Date lastDays) throws IOException {     Date modifiedDate = null;     if (dir != null && dir.isFile()) {       modifiedDate = new Date(dir.lastModified());     }     if (modifiedDate != null && modifiedDate.after(lastDays)) {       return true;     } else {       return false;     }   } }

This is RenameFile.java file having the source code to execute business logic.

/**  *   */ package com.cv.java.file; import java.io.File; /**  * @author Chandra Vardhan  *  */ public class RenameFile {   /**    * @param args    */   public static void main(String[] args) {     File file = new File("hello.xml");     try {       if (!file.exists()) {         file.createNewFile();       }       File newfile = new File("changedHello.xml");              if (file.renameTo(newfile)) {         System.out.println("I am changed");       } else {         System.out.println("I didn't change");       }     } catch (Exception e) {       System.out.println(e.getMessage());     }   } }

This is pom.xml file having the entries of dependency jars and information to build the application .

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.cv.file</groupId> <artifactId>RenameFile</artifactId> <version>1.0</version> </project>

This is log4j.properties file having the entries for logging the information into the console/file.

#By default enabling Console appender # Root logger option log4j.rootLogger=INFO, stdout # Redirect log messages to console log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%-5p [%c]:%L -->> %m%n # Redirect log messages to a log file #log4j.appender.file=org.apache.log4j.RollingFileAppender #log4j.appender.file.File=C:\servlet-application.log #log4j.appender.file.MaxFileSize=5MB #log4j.appender.file.MaxBackupIndex=10 #log4j.appender.file.layout=org.apache.log4j.PatternLayout #log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n