Java内容重新整理删除过期的东西

Java/JavaDemo/codedemo/nio/BufferIO.java

@@ -0,0 +1,61 @@
+package cn.aofeng.demo.nio;
+
+import java.io.Closeable;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.nio.channels.FileChannel;
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+/**
+ * IO-缓冲区操作。
+ * 
+ * @author 聂勇 <a href="mailto:aofengblog@163.com">aofengblog@163.com</a>
+ */
+public class BufferIO {
+
+    private static Logger logger = Logger.getLogger("bufferio");
+    
+    // 缓冲区大小
+    private final static int BUFFER_SIZE = 4096;
+    
+    public static void close(Closeable c) {
+        if (null != c) {
+            try {
+                c.close();
+            } catch (IOException e) {
+                // ingore
+            }
+        }
+    }
+    
+    /**
+     * @param args [0]：读取文件的完整路径
+     */
+    public static void main(String[] args) {
+        String filename = args[0];
+        File file = new File(filename);
+        FileChannel channel = null;
+        try {
+            channel = new FileInputStream(file).getChannel();
+            ByteBuffer buffer = ByteBuffer.allocate(BUFFER_SIZE);
+            long startTime = System.currentTimeMillis();
+            while (channel.read(buffer) > 0) {
+                buffer.flip();
+                buffer.clear();
+            }
+            long endTime = System.currentTimeMillis();
+            logger.info("缓冲区读取文件耗时：" + (endTime-startTime)+"毫秒");
+        } catch (FileNotFoundException e) {
+            logger.log(Level.SEVERE, "找不到文件："+filename, e);
+        } catch (IOException e) {
+            logger.log(Level.SEVERE, "读取文件出错", e);
+        } finally{
+            close(channel);
+        }
+    }
+
+}