Java ZipEntry setLastAccessTime() function with examples


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

public void setLastAccessTime(FileTime v)

Syntax :

zip_entry.setLastAccessTime(v);

Parameters :The function takes FileTime object as parameter, the time of LastAccess 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 setLastAccessTime() function

Example 1: We will create a file named zip_file and get the zip file entry using getEntry() function and then set the LastAccessTime 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 setLastAccessTime() 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 LastAccessTime
            // using the setLastAccessTime()
            // function
            entry.setLastAccessTime(FileTime.fromMillis(100000));
  
            // Get the LastAccessTime
            // using the getLastAccessTime()
            // function
            FileTime input = entry.getLastAccessTime();
  
            // Display the LastAccessTime
            System.out.println("LastAccessTime : " + input.toString());
        }
        catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }
}

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Output:

LastAccessTime : 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 LastAccessTime of the specified ZipEntry.”file.zip” is a zip file present in f: directory. We will set the value of LastAccess time to null. we will take a “.cpp” file as ZipEntry

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// Java program to demonstrate the
// use of getLastAccessTime() 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 LastAccessTime
            // using the setLastAccessTime()
            // function
            entry.setLastAccessTime(null);
  
            // Get the LastAccessTime
            // using the getLastAccessTime()
            // function
            FileTime input = entry.getLastAccessTime();
  
            // Display the LastAccessTime
            System.out.println("LastAccessTime : " + input.toString());
        }
        catch (Exception e) {
            System.out.println(e.getMessage());
        }
    }
}

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Output:

LastAccessTime :

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#setLastAccessTime-java.nio.file.attribute.FileTime-



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