The 7za.exe program is used to compress, extract and update files through the command line. It provides superior compression. It is a great program. The 7za.exe program commands will execute through java to make files compress with password protected and without password protected, extract and update the files in the archive.
Here I am going sharing some command lines to compress the files then we can understand easily execute the same commands through java.
7zip installed directory is C:/Program Files/7-Zip/
To compress files
cd C:/Program Files/7-Zip
C:/Program Files/7-Zip> 7z a -t7z D:/narayanatutorial/files.7z D:/narayanatutorial/*.txtDescription 7z :- use this executable
a :- archive or add. Use it to put the files in an archive
t7z:- traverse and output folder extension is .7z .i.e files.7z
D:/narayanatutorial/files.7z :- output archive folder
D:/narayanatutorial/*.txt:- input files with extension.txt
cd C:/Program Files/7-Zip
C:/Program Files/7-Zip> 7z a -t7z D:/narayanatutorial/files.7z D:/narayanatutorial/*.txt -pSECRETDescription-p :- specify the password .i.e SECRET
To extract files from password protected archive
cd C:/Program Files/7-Zip
C:/Program Files/7-Zip> 7z x D:/narayanatutorial/files.7z
Descriptionx :- extract everything from archive into preserved full path and prompt for the password to enter
To extract files from archive to specified folder
cd C:/Program Files/7-Zip
C:/Program Files/7-Zip> 7z e archive.zip
Descriptione :- extract everything from archive into specified folder
To extract files from archive to preserved full path
cd C:/Program Files/7-Zip
C:/Program Files/7-Zip> 7z x archive.zipDescriptionx :- extract everything from archive into preserved full path
To list the content of archive
cd C:/Program Files/7-Zip
C:/Program Files/7-Zip> 7z l archive.zipDescriptionl :- list the content of archive
To test the integrity of archives
cd C:/Program Files/7-Zip
C:/Program Files/7-Zip> 7z t archive.zip *.txt -rDescriptiont :- test the specified archive
archive.zip :- the archive you want to test
*.txt :- test all these files in the archive
-r :- recurse all child directories
To replace old files in archives
cd C:/Program Files/7-Zip
C:/Program Files/7-Zip> 7z u archive.zip *.txtDescriptionu :- update command
archive.zip :- archive you want to update files in
*.txt :- only update these files (text documents)
Here I am writing java program to create archive with and without password protected by using the above 7z.exe.
7-Zip Command-Line Examples In Java
package com.narayanatutorial.compress;
import java.io.IOException;
import java.io.InputStream;
/**
* @author narayanaswamy
*/
public class CompressFile {
public static void main(String[] args) {
String source_file = "D:/narayanatutorial/file1.txt";
String output_zip_without_password = "D:/file1_without_password.zip";
String output_zip_with_password = "D:/file1_with_password.zip";
String installed_path_7zip = System.getenv("ProgramFiles") + "\7-Zip\7z.exe";
String password = "narayanatutorial";
ProcessBuilder pb = null;
// without password
pb = new ProcessBuilder(
installed_path_7zip,
"a", //archive
"-tzip", // zip format
output_zip_without_password, // output without password zip folder
source_file //input file
);
pb.redirectError();
try {
Process p = pb.start();
new Thread( new CompressFile.InputConsumer( p.getInputStream() )).start();
System.out.println("Exited with: " + p.waitFor());
} catch (Exception ex) {
ex.printStackTrace();
}
// with password protected
pb = new ProcessBuilder(
installed_path_7zip,
"a", //archive
"-tzip", //zip format
output_zip_with_password, // output with password zip folder
source_file, //input file
"-p" + password //password
);
pb.redirectError();
try {
Process p = pb.start();
new Thread( new CompressFile.InputConsumer( p.getInputStream() )).start();
System.out.println("Exited with: " + p.waitFor());
} catch (Exception ex) {
ex.printStackTrace();
}
}
public static class InputConsumer implements Runnable {
private InputStream is;
public InputConsumer(InputStream is) {
this.is = is;
}
@Override
public void run() {
try {
int value = -1;
while ((value = is.read()) != -1) {
System.out.print((char) value);
}
} catch (IOException exp) {
exp.printStackTrace();
}
System.out.println("output stream completed");
}
}
}
Hello! I am Narayanaswamy founder and admin of narayanatutorial.com. I have been working in the IT industry for more than 12 years. NarayanaTutorial is my web technologies blog. My specialties are Java / J2EE, Spring, Hibernate, Struts, Webservices, PHP, Oracle, MySQL, SQLServer, Web Hosting, Website Development, and IAM(ForgeRock) Specialist
I am a self-learner and passionate about training and writing. I am always trying my best to share my knowledge through my blog.
