baeldung-articles : BAEL-6349 (#16067)

Obtaining the Last Path Segment of a URI in Java.

core-java-modules/core-java-networking-4/src/test/java/com/baeldung/obtainlastsegmentofurl/ObtainLastSegmentOfURLUnitTest.java

@@ -0,0 +1,72 @@
+package com.baeldung.obtainlastsegmentofurl;
+
+import org.apache.commons.io.FilenameUtils;
+
+import org.junit.Test;
+
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+public class ObtainLastSegmentOfURLUnitTest {
+    @Test
+    public void givenURL_whenUsingURIClass_thenGetLastPathSegment() throws URISyntaxException {
+        URI uri = new URI("https://www.example.com/path/to/resource");
+        String path = uri.getPath();
+
+        String[] segments = path.split("/");
+        String lastSegment = segments[segments.length - 1];
+
+        assertEquals("resource", lastSegment);
+    }
+
+    @Test
+    public void givenURL_whenUsingPathClass_thenGetLastPathSegment() {
+        String exampleURI = "https://www.example.com/path/to/resource";
+
+        try {
+            URI uri = new URI(exampleURI);
+            String pathString = uri.getPath();
+            Path path = Paths.get(pathString);
+            Path lastSegment = path.getName(path.getNameCount() - 1);
+
+            assertEquals("resource", lastSegment.toString());
+        } catch (Exception e) {
+            fail("Exception occurred: " + e.getMessage());
+        }
+    }
+
+    @Test
+    public void givenURL_whenUsingRegularExpression_thenGetLastPathSegment() throws URISyntaxException {
+        URI uri = new URI("https://www.example.com/path/to/resource");
+        String path = uri.getPath();
+
+        Pattern pattern = Pattern.compile(".*/(.+)");
+        Matcher matcher = pattern.matcher(path);
+
+        if (!matcher.find()) {
+            fail("Regex pattern didn't match.");
+        }
+
+        String lastSegment = matcher.group(1);
+        assertEquals("resource", lastSegment);
+    }
+
+    @Test
+    public void givenURL_whenUsingFilenameUtilsClass_thenGetLastPathSegment() throws URISyntaxException {
+        String exampleURI = "https://www.example.com/path/to/resource";
+
+        URI uri = new URI(exampleURI);
+        String path = uri.getPath();
+
+        String lastSegment = FilenameUtils.getName(path);
+
+        assertEquals("resource", lastSegment);
+    }
+}