[add] add ChannelTransferTest for NIO

brianway · brianway · commit f5dc03628716 · 2019-06-19T00:29:42.000+08:00
diff --git a/java-io/src/test/java/com/brianway/java/nio/tutorial/ChannelTransferTest.java b/java-io/src/test/java/com/brianway/java/nio/tutorial/ChannelTransferTest.java
@@ -0,0 +1,60 @@
+package com.brianway.java.nio.tutorial;
+
+import com.brianway.learning.java.nio.tutorial.BufferDemo;
+import org.junit.Assert;
+import org.junit.Test;
+
+import java.io.IOException;
+import java.io.RandomAccessFile;
+import java.nio.channels.FileChannel;
+
+/**
+ * 通道之间的数据传输
+ *
+ * @auther brian
+ * @since 2019/6/19 00:20
+ */
+public class ChannelTransferTest {
+    private String fromPath = BufferDemo.class.getResource("/").getPath() + "fromFile.txt";
+    private String toPath = BufferDemo.class.getResource("/").getPath() + "toFile.txt";
+
+    @Test
+    public void testTransferFrom() {
+        try {
+            RandomAccessFile fromFile = new RandomAccessFile(fromPath, "rw");
+            FileChannel fromChannel = fromFile.getChannel();
+
+            RandomAccessFile toFile = new RandomAccessFile(toPath, "rw");
+            FileChannel toChannel = toFile.getChannel();
+
+            long position = 0;
+            long count = fromChannel.size();
+
+            long transferBytesSize =
+                    toChannel.transferFrom(fromChannel, position, count);
+            Assert.assertEquals(26, transferBytesSize);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    @Test
+    public void testTransferTo() {
+        try {
+            RandomAccessFile fromFile = new RandomAccessFile(fromPath, "rw");
+            FileChannel fromChannel = fromFile.getChannel();
+
+            RandomAccessFile toFile = new RandomAccessFile(toPath, "rw");
+            FileChannel toChannel = toFile.getChannel();
+
+            long position = 0;
+            long count = fromChannel.size();
+
+            long transferBytesSize =
+                    fromChannel.transferTo(position, count, toChannel);
+            Assert.assertEquals(26, transferBytesSize);
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+}
diff --git a/java-io/src/test/resources/fromFile.txt b/java-io/src/test/resources/fromFile.txt
@@ -0,0 +1,3 @@
+1234567
+qwertyusfdf
+asdsad
