How to get the size of a file in MB Megabytes

Question

I have a zip file on a server  How can I check if the file size is larger than 27 MB  File file   new File  quot U  intranet root intranet R1112B2 zip quot    if  file  gt  27         do something

User · Answer

Kotlin Extension Solution

Add these somewhere, then call if (myFile.sizeInMb > 27.0) or whichever you need:

val File.size get() = if (!exists()) 0.0 else length().toDouble()
val File.sizeInKb get() = size / 1024
val File.sizeInMb get() = sizeInKb / 1024
val File.sizeInGb get() = sizeInMb / 1024
val File.sizeInTb get() = sizeInGb / 1024

If you'd like to make working with a String or Uri easier, try adding these:

fun Uri.asFile(): File = File(toString())

fun String?.asUri(): Uri? {
    try {
        return Uri.parse(this)
    } catch (e: Exception) {
    }
    return null
}

If you'd like to easily display the values as a string, these are simple wrappers. Feel free to customize the default decimals displayed

fun File.sizeStr(): String = size.toString()
fun File.sizeStrInKb(decimals: Int = 0): String = "%.${decimals}f".format(sizeInKb)
fun File.sizeStrInMb(decimals: Int = 0): String = "%.${decimals}f".format(sizeInMb)
fun File.sizeStrInGb(decimals: Int = 0): String = "%.${decimals}f".format(sizeInGb)

fun File.sizeStrWithBytes(): String = sizeStr() + "b"
fun File.sizeStrWithKb(decimals: Int = 0): String = sizeStrInKb(decimals) + "Kb"
fun File.sizeStrWithMb(decimals: Int = 0): String = sizeStrInMb(decimals) + "Mb"
fun File.sizeStrWithGb(decimals: Int = 0): String = sizeStrInGb(decimals) + "Gb"

User · Answer

You can use FileChannel in Java    FileChannel has the size   method to determine the size of the file       String fileName    D   words txt        Path filePath   Paths get fileName        FileChannel fileChannel   FileChannel open filePath       long fileSize   fileChannel size         System out format  The size of the file   d bytes   fileSize     Or you can determine the file size using Apache Commons  FileUtils  sizeOf   method  If you are using maven  add this to pom xml file     lt dependency gt       lt groupId gt commons-io lt  groupId gt       lt artifactId gt commons-io lt  artifactId gt       lt version gt 2 6 lt  version gt   lt  dependency gt    Try the following coding       String fileName    D   words txt       File f   new File fileName        long fileSize   FileUtils sizeOf f                System out format  The size of the file   d bytes   fileSize     These methods will output the size in Bytes  So to get the MB size  you need to divide the file size from  1024 1024     Now you can simply use the if-else conditions since the size is captured in MB

User · Answer

public static long sizeOf File file    More info on API   http   commons apache org proper commons-io apidocs org apache commons io FileUtils html

User · Answer

file length   will return you the length in bytes  then you divide that by 1048576  and now you ve got megabytes

User · Answer

You can use substring to get portio of String which is equal to 1 mb   public static void main String   args               Get length of String in bytes         String string    long string           long sizeInBytes   string getBytes   length          int oneMb 1024 1024          if  sizeInBytes gt oneMb              String string1Mb string substring 0  oneMb

User · Answer

You can retrieve the length of the file with File length    which will return a value in bytes  so you need to divide this by 1024 1024 to get its value in mb

User · Answer

Use the length   method of the File class to return the size of the file in bytes      Get file from file name File file   new File  U  intranet root intranet R1112B2 zip        Get length of file in bytes long fileSizeInBytes   file length       Convert the bytes to Kilobytes  1 KB   1024 Bytes  long fileSizeInKB   fileSizeInBytes   1024     Convert the KB to MegaBytes  1 MB   1024 KBytes  long fileSizeInMB   fileSizeInKB   1024   if  fileSizeInMB  gt  27              You could combine the conversion into one step  but I ve tried to fully illustrate the process

User · Answer

Try following code   File file   new File  infilename        Get the number of bytes in the file long sizeInBytes   file length      transform in MB long sizeInMb   sizeInBytes    1024   1024

User · Answer

Example       public static String getStringSizeLengthFile long size         DecimalFormat df   new DecimalFormat  0 00         float sizeKb   1024 0f      float sizeMb   sizeKb   sizeKb      float sizeGb   sizeMb   sizeKb      float sizeTerra   sizeGb   sizeKb        if size  lt  sizeMb          return df format size   sizeKb     Kb       else if size  lt  sizeGb          return df format size   sizeMb      Mb       else if size  lt  sizeTerra          return df format size   sizeGb      Gb        return

User · Answer

String FILE NAME    C   Ajay  TEST  data 996KB json        File file   new File FILE NAME        if  file length     lt    1048576                   System out println  file size is less than 1 mb             else               System out println  file size is More  than 1 mb                             Note  1048576   1024 1024  1MB output   file size is less than 1 mb

User · Answer

Easiest is by using FileUtils from Apache commons-io   https   commons apache org proper commons-io javadocs api-2 5 org apache commons io FileUtils html    Returns human readable file size from Bytes to Exabytes   rounding down to the boundary   File fileObj   new File filePathString   String fileSizeReadable   FileUtils byteCountToDisplaySize fileObj length         output will be like 56 MB

User · Answer

Since Java 7 you can use java nio file Files size Path p    Path path   Paths get  C   1 txt     long expectedSizeInMB   27  long expectedSizeInBytes   1024   1024   expectedSizeInMB   long sizeInBytes   -1  try       sizeInBytes   Files size path     catch  IOException e        System err println  Cannot get the size -     e       return     if  sizeInBytes  gt  expectedSizeInBytes        System out println  Bigger than     expectedSizeInMB     MB      else       System out println  Not bigger than     expectedSizeInMB     MB

[java] How to get the size of a file in MB (Megabytes)?

Kotlin Extension Solution

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