From 36608b78ccf19f492f031074aba83c8ec3702146 Mon Sep 17 00:00:00 2001 From: Ahmed Tawila Date: Sun, 30 Jul 2017 10:57:10 +0300 Subject: [PATCH] BAEL-1033 Introduction to StreamUtils (#2337) * Evaluation article: Different Types of Bean Injection in Spring * added tests & changed configuration to Java-based config * removed xml config files * rename unit tests * BAEL-972 - Apache Commons Text * remove code from evaluation article * remove code from evaluation article * BAEL-972 - Apache Commons Text - added another example * BAEL-972 - Apache Commons Text - just indentation * BAEL-994 - TemporalAdjuster in Java * BAEL-994 - TemporalAdjuster in Java * BAEL-994 - TemporalAdjuster in Java * BAEL-994 - TemporalAdjuster in Java * BAEL-994 - TemporalAdjuster in Java - fix problems * BAEL-1033 Introduction to StreamUtils * BAEL-1033 Introduction to StreamUtils --- .../CustomTemporalAdjusterTest.java | 2 +- .../com/baeldung/streamutils/CopyStream.java | 22 ++++ .../com/baeldung/streamutils/DrainStream.java | 11 ++ .../baeldung/streamutils/CopyStreamTest.java | 100 ++++++++++++++++++ libraries/src/test/resources/input.txt | 1 + libraries/src/test/resources/output.txt | 1 + 6 files changed, 136 insertions(+), 1 deletion(-) create mode 100644 libraries/src/main/java/com/baeldung/streamutils/CopyStream.java create mode 100644 libraries/src/main/java/com/baeldung/streamutils/DrainStream.java create mode 100644 libraries/src/test/java/com/baeldung/streamutils/CopyStreamTest.java create mode 100644 libraries/src/test/resources/input.txt create mode 100644 libraries/src/test/resources/output.txt diff --git a/core-java/src/test/java/com/baeldung/temporaladjusters/CustomTemporalAdjusterTest.java b/core-java/src/test/java/com/baeldung/temporaladjusters/CustomTemporalAdjusterTest.java index ad8de82e1f..7b5f781620 100644 --- a/core-java/src/test/java/com/baeldung/temporaladjusters/CustomTemporalAdjusterTest.java +++ b/core-java/src/test/java/com/baeldung/temporaladjusters/CustomTemporalAdjusterTest.java @@ -41,4 +41,4 @@ public class CustomTemporalAdjusterTest { assertEquals(fourteenDaysAfterDate, result.toString()); } -} +} \ No newline at end of file diff --git a/libraries/src/main/java/com/baeldung/streamutils/CopyStream.java b/libraries/src/main/java/com/baeldung/streamutils/CopyStream.java new file mode 100644 index 0000000000..430759f3a0 --- /dev/null +++ b/libraries/src/main/java/com/baeldung/streamutils/CopyStream.java @@ -0,0 +1,22 @@ +package com.baeldung.streamutils; + +import java.io.FileInputStream; +import java.io.IOException; +import java.io.InputStream; +import java.io.StringWriter; + +import org.apache.commons.io.IOUtils; +import org.springframework.util.StreamUtils; + +public class CopyStream { + public static String getStringFromInputStream(InputStream input) throws IOException { + StringWriter writer = new StringWriter(); + IOUtils.copy(input, writer, "UTF-8"); + return writer.toString(); + } + + public InputStream getNonClosingInputStream() throws IOException { + InputStream in = new FileInputStream("src/test/resources/input.txt"); + return StreamUtils.nonClosing(in); + } +} diff --git a/libraries/src/main/java/com/baeldung/streamutils/DrainStream.java b/libraries/src/main/java/com/baeldung/streamutils/DrainStream.java new file mode 100644 index 0000000000..6ee4a1ef3a --- /dev/null +++ b/libraries/src/main/java/com/baeldung/streamutils/DrainStream.java @@ -0,0 +1,11 @@ +package com.baeldung.streamutils; + +import java.io.InputStream; + +import org.springframework.util.StreamUtils; + +public class DrainStream { + public InputStream getInputStream() { + return StreamUtils.emptyInput(); + } +} diff --git a/libraries/src/test/java/com/baeldung/streamutils/CopyStreamTest.java b/libraries/src/test/java/com/baeldung/streamutils/CopyStreamTest.java new file mode 100644 index 0000000000..9a65075e5b --- /dev/null +++ b/libraries/src/test/java/com/baeldung/streamutils/CopyStreamTest.java @@ -0,0 +1,100 @@ +package com.baeldung.streamutils; + +import static org.junit.Assert.assertTrue; + +import java.io.File; +import java.io.FileInputStream; +import java.io.FileOutputStream; +import java.io.IOException; +import java.io.InputStream; +import java.io.OutputStream; +import java.nio.charset.StandardCharsets; + +import org.junit.Assert; +import org.junit.Test; +import org.springframework.util.StreamUtils; + +import static com.baeldung.streamutils.CopyStream.getStringFromInputStream; + +public class CopyStreamTest { + + @Test + public void whenCopyInputStreamToOutputStream_thenCorrect() throws IOException { + String inputFileName = "src/test/resources/input.txt"; + String outputFileName = "src/test/resources/output.txt"; + File outputFile = new File(outputFileName); + InputStream in = new FileInputStream(inputFileName); + OutputStream out = new FileOutputStream(outputFileName); + + StreamUtils.copy(in, out); + + assertTrue(outputFile.exists()); + String inputFileContent = getStringFromInputStream(new FileInputStream(inputFileName)); + String outputFileContent = getStringFromInputStream(new FileInputStream(outputFileName)); + Assert.assertEquals(inputFileContent, outputFileContent); + } + + @Test + public void whenCopyRangeOfInputStreamToOutputStream_thenCorrect() throws IOException { + String inputFileName = "src/test/resources/input.txt"; + String outputFileName = "src/test/resources/output.txt"; + File outputFile = new File(outputFileName); + InputStream in = new FileInputStream(inputFileName); + OutputStream out = new FileOutputStream(outputFileName); + + StreamUtils.copyRange(in, out, 1, 10); + + assertTrue(outputFile.exists()); + String inputFileContent = getStringFromInputStream(new FileInputStream(inputFileName)); + String outputFileContent = getStringFromInputStream(new FileInputStream(outputFileName)); + Assert.assertEquals(inputFileContent.substring(1, 11), outputFileContent); + } + + @Test + public void whenCopyStringToOutputStream_thenCorrect() throws IOException { + String string = "Should be copied to OutputStream."; + String outputFileName = "src/test/resources/output.txt"; + File outputFile = new File(outputFileName); + OutputStream out = new FileOutputStream("src/test/resources/output.txt"); + + StreamUtils.copy(string, StandardCharsets.UTF_8, out); + + assertTrue(outputFile.exists()); + String outputFileContent = getStringFromInputStream(new FileInputStream(outputFileName)); + Assert.assertEquals(outputFileContent, string); + } + + @Test + public void whenCopyInputStreamToString_thenCorrect() throws IOException { + String inputFileName = "src/test/resources/input.txt"; + InputStream is = new FileInputStream(inputFileName); + String content = StreamUtils.copyToString(is, StandardCharsets.UTF_8); + + String inputFileContent = getStringFromInputStream(new FileInputStream(inputFileName)); + Assert.assertEquals(inputFileContent, content); + } + + @Test + public void whenCopyByteArrayToOutputStream_thenCorrect() throws IOException { + String outputFileName = "src/test/resources/output.txt"; + String string = "Should be copied to OutputStream."; + byte[] byteArray = string.getBytes(); + OutputStream out = new FileOutputStream("src/test/resources/output.txt"); + + StreamUtils.copy(byteArray, out); + String outputFileContent = getStringFromInputStream(new FileInputStream(outputFileName)); + Assert.assertEquals(outputFileContent, string); + } + + @Test + public void whenCopyInputStreamToByteArray_thenCorrect() throws IOException { + String inputFileName = "src/test/resources/input.txt"; + InputStream in = new FileInputStream(inputFileName); + byte[] out = StreamUtils.copyToByteArray(in); + + String content = new String(out); + String inputFileContent = getStringFromInputStream(new FileInputStream(inputFileName)); + Assert.assertEquals(inputFileContent, content); + } + +} diff --git a/libraries/src/test/resources/input.txt b/libraries/src/test/resources/input.txt new file mode 100644 index 0000000000..811232fa1f --- /dev/null +++ b/libraries/src/test/resources/input.txt @@ -0,0 +1 @@ +This file is merely for testing. \ No newline at end of file diff --git a/libraries/src/test/resources/output.txt b/libraries/src/test/resources/output.txt new file mode 100644 index 0000000000..34e1e27d5a --- /dev/null +++ b/libraries/src/test/resources/output.txt @@ -0,0 +1 @@ +Should be copied to OutputStream. \ No newline at end of file