+ This demo shows how to use the try-with-resources feature introduced in JDK7. +
+ ++ Shows how to use a custom resource with the try-with-resources construct. + For more information, see the source file. +
+ Source: src/CustomAutoCloseableSample.java + ++ Extracts archived files. For more information, see the source file. +
+ Source: src/Unzip.java +Prints data about a specified file from an archive. For more information, see the source file.
+ Source: src/ZipCat.java + +flush method of TeeStream flushes
+ * the specified output stream and the file output stream.
+ *
+ * @throws IOException if an I/O error occurs.
+ */
+ @Override
+ public void flush() throws IOException {
+ outputStream.flush();
+ fileStream.flush();
+ }
+
+ /**
+ * Closes underlying streams and resources.
+ * The external output stream won't be closed.
+ * This method is the member of AutoCloseable interface and
+ * it will be invoked automatically after the try-with-resources block.
+ *
+ * @throws IOException If an I/O error occurs.
+ */
+ @Override
+ public void close() throws IOException {
+ try (OutputStream file = fileStream) {
+ flush();
+ }
+ }
+ }
+}
diff -r f72a8df6a2ed -r 4574011c1689 src/share/sample/try-with-resources/src/Unzip.java
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/sample/try-with-resources/src/Unzip.java Fri Jan 31 12:01:31 2014 +0100
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of Oracle nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * This source code is provided to illustrate the usage of a given feature
+ * or technique and has been deliberately simplified. Additional steps
+ * required for a production-quality application, such as security checks,
+ * input validation, and proper error handling, might not be present in
+ * this sample code.
+ */
+
+import java.io.IOException;
+import java.io.UncheckedIOException;
+import java.nio.file.*;
+
+import static java.nio.file.StandardCopyOption.REPLACE_EXISTING;
+
+/**
+ * Extract (unzip) a file to the current directory.
+ */
+public class Unzip {
+
+ /**
+ * The main method for the Unzip program. Run the program with an empty
+ * argument list to see possible arguments.
+ *
+ * @param args the argument list for {@code Unzip}.
+ */
+ public static void main(String[] args) {
+ if (args.length != 1) {
+ System.out.println("Usage: Unzip zipfile");
+ }
+ final Path destDir = Paths.get(".");
+ /*
+ * Create AutoCloseable FileSystem. It will be closed automatically
+ * after the try block.
+ */
+ try (FileSystem zipFileSystem = FileSystems.newFileSystem(Paths.get(args[0]), null)) {
+
+ Path top = zipFileSystem.getPath("/");
+ Files.walk(top).skip(1).forEach(file -> {
+ Path target = destDir.resolve(top.relativize(file).toString());
+ System.out.println("Extracting " + target);
+ try {
+ Files.copy(file, target, REPLACE_EXISTING);
+ } catch (IOException e) {
+ throw new UncheckedIOException(e);
+ }
+ });
+ } catch (UncheckedIOException | IOException e) {
+ e.printStackTrace();
+ System.exit(1);
+ }
+ }
+}
diff -r f72a8df6a2ed -r 4574011c1689 src/share/sample/try-with-resources/src/ZipCat.java
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/sample/try-with-resources/src/ZipCat.java Fri Jan 31 12:01:31 2014 +0100
@@ -0,0 +1,83 @@
+/*
+ * Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * - Neither the name of Oracle nor the names of its
+ * contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * This source code is provided to illustrate the usage of a given feature
+ * or technique and has been deliberately simplified. Additional steps
+ * required for a production-quality application, such as security checks,
+ * input validation, and proper error handling, might not be present in
+ * this sample code.
+ */
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.FileSystem;
+import java.nio.file.FileSystems;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+/**
+ * Prints data of the specified file to standard output from a zip archive.
+ */
+public class ZipCat {
+
+ /**
+ * The main method for the ZipCat program. Run the program with an empty
+ * argument list to see possible arguments.
+ *
+ * @param args the argument list for ZipCat
+ */
+ public static void main(String[] args) {
+ if (args.length != 2) {
+ System.out.println("Usage: ZipCat zipfile fileToPrint");
+ }
+ /*
+ * Creates AutoCloseable FileSystem and BufferedReader.
+ * They will be closed automatically after the try block.
+ * If reader initialization fails, then zipFileSystem will be closed
+ * automatically.
+ */
+ try (FileSystem zipFileSystem
+ = FileSystems.newFileSystem(Paths.get(args[0]),null);
+ InputStream input
+ = Files.newInputStream(zipFileSystem.getPath(args[1]))) {
+ byte[] buffer = new byte[1024];
+ int len;
+ while ((len = input.read(buffer)) != -1) {
+ System.out.write(buffer, 0, len);
+ }
+
+ } catch (IOException e) {
+ e.printStackTrace();
+ System.exit(1);
+ }
+ }
+}