BAEL-6804: Difference Between ZipFile and ZipInputStream in Java (#15039)

* BAEL-6804: Difference Between ZipFile and ZipInputStream in Java * BAEL-6804: Difference Between ZipFile and ZipInputStream in Java - use 2-space indents for line continuations
2023-10-30 00:56:52 +00:00
parent b7edd335a9
commit a127e7644e
4 changed files with 281 additions and 0 deletions
@@ -0,0 +1,83 @@
+package com.baeldung.zip;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import java.io.*;
+import java.util.*;
+import java.util.zip.*;
+
+import org.junit.*;
+
+public class ZipUnitTest {
+
+    private static File compressedFile;
+    private static List<String> dataList = new ArrayList<>();
+
+    @BeforeClass
+    public static void prepareData() throws IOException {
+        ZipSampleFileStore sampleFileStore = new ZipSampleFileStore(ZipBenchmark.NUM_OF_FILES, ZipBenchmark.DATA_SIZE);
+        compressedFile = sampleFileStore.getFile();
+        dataList = sampleFileStore.getDataList();
+    }
+
+    @Test
+    public void whenCreateZipFile_thenCompressedSizeShouldBeLessThanOriginal() throws IOException {
+        byte[] data = ZipSampleFileStore.createRandomStringInByte(10240);
+        File file = File.createTempFile("zip-temp", "");
+
+        try (
+            BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file));
+            ZipOutputStream zos = new ZipOutputStream(bos)
+        ) {
+            ZipEntry zipEntry = new ZipEntry("zip-entry.txt");
+            zos.putNextEntry(zipEntry);
+            zos.write(data);
+            zos.closeEntry();
+
+            assertThat(file.length()).isLessThan(data.length);
+        }
+        finally {
+            file.delete();
+        }
+    }
+
+    @Test
+    public void whenReadAllEntriesViaZipFile_thenDataIsEqualtoTheSource() throws IOException {
+
+        try (ZipFile zipFile = new ZipFile(compressedFile)) {
+            Enumeration<? extends ZipEntry> entries = zipFile.entries();
+            List<? extends ZipEntry> entryList = Collections.list(entries);
+
+            for (int idx=0; idx<entryList.size(); idx++) {
+                ZipEntry zipEntry = entryList.get(idx);
+                try (InputStream inputStream = zipFile.getInputStream(zipEntry)) {
+                    String actual = ZipSampleFileStore.getString(inputStream);
+                    assertThat(actual).as("Data for ZIP entry: " + zipEntry.getName()).isEqualTo(dataList.get(idx));
+                }
+            }
+        }
+    }
+
+    @Test
+    public void whenReadAllEntriesViaZipInputStream_thenDataIsEqualtoTheSource() throws IOException {
+        int idx = 0;
+        try (
+            BufferedInputStream bis = new BufferedInputStream(new FileInputStream(compressedFile));
+            ZipInputStream zipInputStream = new ZipInputStream(bis)
+        ) {
+            ZipEntry zipEntry;
+            while ((zipEntry = zipInputStream.getNextEntry()) != null) {
+                String actual = ZipSampleFileStore.getString(zipInputStream);
+                assertThat(actual).as("Data for ZIP entry: " + zipEntry.getName()).isEqualTo(dataList.get(idx++));
+            }
+        }
+    }
+
+    @AfterClass
+    public static void cleanup() {
+        if (compressedFile.exists()) {
+            compressedFile.delete();
+        }
+    }
+
+}