Java ZipEntry setLastModifiedTime() function with examples


The setLastModifiedTime() function is a part of java.util.zip package. The function is used to set the Last Modified Time of Zip Entry . The Function takes FileTime object as parameter.
The FileTime Object, which represents the LastModified time of the ZipEntry .
If the ZipEntry is read from ZIP file or ZIP file formatted input stream then this is the Last modified time else Last modification time is read from the entry’s date and time fields.
Function Signature :

public void setLastModifiedTime(FileTime v)

Syntax :

zip_entry.setLastModifiedTime(v);

Parameters :The function takes FileTime object as parameter, the time of LastModified of the file.
Return value :The function does not take any parameter
Exceptions :The function throws NullPointerException if the time is null



Below programs illustrates the use of setLastModifiedTime() function

Example 1: We will create a file named zip_file and get the zip file entry using getEntry() function and then set the LastModifiedTime 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 setLastModifiedTime() function
  
import java.util.zip.*;
import java.util.Enumeration;
import java.util.*;
import java.io.*;
import java.nio.file.attribute.*;
  
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");
  
            // set the LastModifiedTime
            // using the setLastModifiedTime()
            // function
            entry.setLastModifiedTime(FileTime.fromMillis(100000));
  
            // Get the LastModifiedTime
            // using the getLastModifiedTime()
            // function
            FileTime input = entry.getLastModifiedTime();
  
            // Display the LastModifiedTime
            System.out.println("LastModifiedTime : " + input.toString());
        }
        catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }
}

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Output:

LastModifiedTime : 1970-01-01T00:01:40Z

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

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// Java program to demonstrate the
// use of getLastModifiedTime() function
  
import java.util.zip.*;
import java.util.Enumeration;
import java.util.*;
import java.io.*;
import java.nio.file.attribute.*;
  
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");
  
            // set the LastModifiedTime
            // using the setLastModifiedTime()
            // function
            entry.setLastModifiedTime(null);
  
            // Get the LastModifiedTime
            // using the getLastModifiedTime()
            // function
            FileTime input = entry.getLastModifiedTime();
  
            // Display the LastModifiedTime
            System.out.println("LastModifiedTime : " + input.toString());
        }
        catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }
}

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Output:

LastModifiedTime :

The Program terminated due to error as null value is set

Reference: https://docs.oracle.com/javase/8/docs/api/java/util/zip/ZipEntry.html#setLastModifiedTime-java.nio.file.attribute.FileTime-



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