Java ZipEntry getCompressedSize() function with examples


The getCompressedSize() function is a part of java.util.zip package. The function returns the Compressed Size of a specific ZipEntry or -1 if not known.
Function Signature :

public long getCompressedSize()

Syntax :

zip_entry.getCompressedSize();

Parameters :No parameter is required for this function.
Return value :The function returns a long value, the CompressedSize of this ZipEntry.
Exceptions :The function does not throw any exception.



Below programs illustrates the use of getCompressedSize() function

Example 1: We will create a file named zip_file and get the zip file entry using getEntry() function and then get the Compressed Size of the specified ZipEntry.”file.zip” is a zip file present in f: directory. we will take a “.zip” file as ZipEntry

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// Java program to demonstrate the
// use of getCompressedSize() function
  
import java.util.zip.*;
import java.util.Enumeration;
import java.util.*;
import java.io.*;
  
public class solution {
    public static void main(String args[])
    {
        try {
            // Create a Zip File
            ZipFile zip_file = new ZipFile("f:\\file1.zip");
  
            // get the Zip Entry using
            // the getEntry() function
            ZipEntry entry = zip_file.getEntry("file.zip");
  
            // Get the CompressedSize
            // using the getCompressedSize()
            // function
            long input = entry.getCompressedSize();
  
            // Display the CompressedSize
            System.out.println("CompressedSize : " + input);
        }
        catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }
}

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Output:

CompressedSize : 2022

Example 2: We will create a file named zip_file and get the zip file entry using getEntry() function and then get the CompressedSize of the specified ZipEntry.”file.zip” is a zip file present in f: directory. we will take a “.cpp” file as ZipEntry

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// Java program to demonstrate the
// use of getCompressedSize() function
  
import java.util.zip.*;
import java.util.Enumeration;
import java.util.*;
import java.io.*;
  
public class solution {
    public static void main(String args[])
    {
        try {
            // Create a Zip File
            ZipFile zip_file = new ZipFile("f:\\file1.zip");
  
            // get the Zip Entry using
            // the getEntry() function
            ZipEntry entry = zip_file.getEntry("file1.cpp");
  
            // Get the CompressedSize
            // using the getCompressedSize()
            // function
            long input = entry.getCompressedSize();
  
            // Display the CompressedSize
            System.out.println("CompressedSize : " + input);
        }
        catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }
}

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Output:

CompressedSize : 291

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/zip/ZipEntry.html#getCompressedSize–



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Second year Department of Information Technology Jadavpur University

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