[add] add FileChannelTest for NIO

brianway · brianway · commit 61d3d0f42317 · 2019-06-24T23:32:29.000+08:00
diff --git a/java-io/src/test/java/com/brianway/java/nio/tutorial/FileChannelTest.java b/java-io/src/test/java/com/brianway/java/nio/tutorial/FileChannelTest.java
@@ -0,0 +1,31 @@
+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;
+
+/**
+ * FileChannel测试
+ *
+ * @auther brian
+ * @since 2019/6/24 23:00
+ */
+public class FileChannelTest {
+    private String dir = BufferDemo.class.getResource("/").getPath();
+    private String path = BufferDemo.class.getResource("/").getPath() + "fileChannel.txt";
+
+    @Test
+    public void testTruncate() throws IOException {
+        RandomAccessFile aFile = new RandomAccessFile(dir + "truncate.txt", "rw");
+        FileChannel channel = aFile.getChannel();
+        int size = 10;
+        //  Truncates this channel's file to the given size.
+        channel.truncate(size);
+        long fileSize = channel.size();
+        Assert.assertEquals(size, fileSize);
+    }
+}
diff --git a/java-io/src/test/resources/fileChannel.txt b/java-io/src/test/resources/fileChannel.txt
@@ -0,0 +1,4 @@
+asdasdas
+ahfsadkjhsdfkjl
+23232323
+2323
diff --git a/java-io/src/test/resources/truncate.txt b/java-io/src/test/resources/truncate.txt
@@ -0,0 +1,4 @@
+asdasdas
+ahfsadkjhsdfkjl
+23232323
+2323
