Unzip the zip file in Java

Since I had the opportunity to unzip the zip file with Java, it will be a technical memo at that time (´ ・ ω ・ `) First of all, the three files to be stored in the zip (ʻa.txt, dir1 / b" Create .txt, dir1 / dir2 / c.txt`).

mkdir -p dir1/dir2
touch a.txt dir1/b.txt dir1/dir2/c.txt
echo "AAAAAAAAAA" > a.txt
echo "BBBBBBBBBB" > dir1/b.txt
echo "CCCCCCCCCC" > dir1/dir2/c.txt

You can check the created contents with the following command.

find . -name "*.txt" | while read path; do
  echo "---> ${path} <---"
  cat ${path}
---> ./a.txt <---
---> ./dir1/b.txt <---
---> ./dir1/dir2/c.txt <---

Now that you have confirmed that the three files have been created as expected, compress them as a text.zip file.

$ zip "text.zip" $(find . -name "*.txt")
  adding: a.txt (deflated 45%)
  adding: dir1/b.txt (deflated 45%)
  adding: dir1/dir2/c.txt (deflated 45%)

Finally, let's confirm that the text.zip file was created successfully.

$ unzip -l text.zip
Archive:  text.zip
  Length      Date    Time    Name
---------  ---------- -----   ----
       11  2018-08-24 23:17   a.txt
       11  2018-08-24 23:17   dir1/b.txt
       11  2018-08-24 23:17   dir1/dir2/c.txt
---------                     -------
       33                     3 files

The introduction has been lengthened, but if you want to unzip the text.zip file into the text directory, the Java code to do that is:

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;

public class Main {
    public static void main(String[] args) throws IOException {
        var target = Paths.get("text");
        var zipfile = Paths.get("text.zip");
        try (var in = new ZipInputStream(Files.newInputStream(zipfile))) {
            ZipEntry e;
            while ((e = in.getNextEntry()) != null) {
                var dst = Paths.get(target.toString(), e.getName());
                Files.write(dst, in.readAllBytes());
                System.out.printf("inflating: %s%n", dst);

When you run this Java code, the text.zip will be unzipped into the text directory and you should see a log similar to the following in standard output.

inflating: text\a.txt
inflating: text\dir1\b.txt
inflating: text\dir1\dir2\c.txt

So was the text.zip file really unzipped under the text directory? You can check this with the following command.

$ find ./text -name "*.txt" | while read path; do
>   echo "---> ${path} <---"
>   cat ${path}
> done
---> ./text/a.txt <---
---> ./text/dir1/b.txt <---
---> ./text/dir1/dir2/c.txt <---

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