Java NIO (New IO) \u306f\u3001Java 1.4 \u3067\u5c0e\u5165\u3055\u308c\u305f\u5f93\u6765\u306e Java IO \u3092\u7f6e\u304d\u63db\u3048\u308b\u305f\u3081\u306e\u65b0\u3057\u3044\u5165\u51fa\u529b API \u3067\u3059\u3002NIO \u306f\u3001\u3088\u308a\u52b9\u7387\u7684\u3067\u67d4\u8edf\u306a IO \u51e6\u7406\u65b9\u6cd5\u3092\u63d0\u4f9b\u3057\u3001\u975e\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0 IO \u30e2\u30c7\u30eb\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n
Java NIO \u306e\u4e2d\u6838\u3068\u306a\u308b\u6982\u5ff5\u306f\u30c1\u30e3\u30cd\u30eb\uff08Channel\uff09\u3068\u30d0\u30c3\u30d5\u30a1\uff08Buffer\uff09\u3067\u3059\u3002\u30c1\u30e3\u30cd\u30eb\u306f\u30d5\u30a1\u30a4\u30eb\u3084\u30bd\u30b1\u30c3\u30c8\u306a\u3069\u306e\u5b9f\u4f53\u3078\u306e\u30aa\u30fc\u30d7\u30f3\u63a5\u7d9a\u3092\u8868\u3057\u3001\u30c1\u30e3\u30cd\u30eb\u3092\u901a\u3058\u3066\u8aad\u307f\u66f8\u304d\u64cd\u4f5c\u3092\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u30d0\u30c3\u30d5\u30a1\u306f\u30c7\u30fc\u30bf\u306e\u683c\u7d0d\u5834\u6240\u3067\u3042\u308a\u3001\u30c1\u30e3\u30cd\u30eb\u3068\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u9593\u3067\u30c7\u30fc\u30bf\u3092\u8ee2\u9001\u3057\u307e\u3059\u3002<\/p>\n
Java NIO \u3092\u4f7f\u3063\u305f\u30d5\u30a1\u30a4\u30eb\u8aad\u307f\u8fbc\u307f\u306e\u7c21\u6613\u7684\u306a\u4f8b\u3092\u4ee5\u4e0b\u306b\u793a\u3059\u3002<\/p>\n
import java.io.IOException;<\/p>\n
import java.nio.ByteBuffer;<\/p>\n
import java.nio.channels.FileChannel;<\/p>\n
import java.nio.file.Path;<\/p>\n
import java.nio.file.Paths;<\/p>\n
java.nio.file.StandardOpenOption \u3092\u30a4\u30f3\u30dd\u30fc\u30c8\u3057\u307e\u3059\u3002<\/p>\n
public class FileReadExample {<\/p>\n
public static void main(String[] args)<\/p>\n
Path filePath = Paths.get(“\u30d5\u30a1\u30a4\u30eb\u3078\u306e\u30d1\u30b9”);<\/p>\n
\u30cd\u30a4\u30c6\u30a3\u30d6\u306a\u65e5\u672c\u8a9e\u3067\u8a00\u3044\u63db\u3048\u3066\u304f\u3060\u3055\u3044\u3002\u30aa\u30d7\u30b7\u30e7\u30f3\u306f 1 \u3064\u3060\u3051\u3067\u69cb\u3044\u307e\u305b\u3093\u3002try (FileChannel fileChannel = FileChannel.open(filePath, StandardOpenOption.READ)) {<\/p>\n
ByteBuffer buffer = ByteBuffer.allocate(1024);<\/p>\n
int bytesRead = fileChannel.read(buffer);<\/p>\n
while (bytesRead != -1) {<\/p>\n
\u30d0\u30c3\u30d5\u30a1\u3092\u53cd\u8ee2\u3057\u307e\u3059\u3002<\/p>\n
\u30d0\u30c3\u30d5\u30a1\u30fc\u306b\u6b8b\u3063\u3066\u3044\u308b\u3082\u306e\u304c\u3042\u308b\u9593\u306f {<\/p>\n
System.out.print((char)buffer.get());<\/p>\n
\u5f7c\u306f\u3001\u5e7c\u3044\u9803\u304b\u3089\u7d75\u3092\u63cf\u304f\u3053\u3068\u3092\u611b\u3057\u3066\u3044\u305f\u3002<\/p>\n
\u30d0\u30c3\u30d5\u30a1\u3092\u6d88\u53bb\u3059\u308b\u3002<\/p>\n
bytesRead = fileChannel.read(buffer);<\/p>\n
\u76f4\u63a5\u65e5\u672c\u8a9e\u3067\u8a00\u3044\u63db\u3048\u3066\u304f\u3060\u3055\u3044\u30021\u3064\u306e\u30aa\u30d7\u30b7\u30e7\u30f3\u3067\u5341\u5206\u3067\u3059\u3002<\/p>\n
catch (IOException e) {}<\/p>\n
e.printStackTrace();<\/p>\n
\u6642\u9593\u306f\u304b\u304b\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u304c\u3001\u79c1\u305f\u3061\u306f\u305d\u308c\u3092\u3084\u308a\u9042\u3052\u307e\u3059\u3002<\/p>\n
\u98df\u3079\u904e\u304e\u308b\u3068\u304a\u8179\u3092\u58ca\u3057\u307e\u3059\u3002<\/p>\n
\u79c1\u306f\u751f\u307e\u308c\u3064\u304d\u306e\u65e5\u672c\u4eba\u3067\u3001\u65e5\u672c\u8a9e\u30cd\u30a4\u30c6\u30a3\u30d6\u3067\u3059\u3002<\/p>\n
\u4e0a\u306e\u4f8b\u3067\u306f\u3001\u307e\u305aPath\u30af\u30e9\u30b9\u3067\u8aad\u307f\u8fbc\u3080\u30d5\u30a1\u30a4\u30eb\u306e\u30d1\u30b9\u3092\u53d6\u5f97\u3057\u3001FileChannel.open\u30e1\u30bd\u30c3\u30c9\u3067\u8aad\u307f\u8fbc\u307f\u7528\u306e\u30d5\u30a1\u30a4\u30eb\u30c1\u30e3\u30cd\u30eb\u3092\u958b\u304d\u3001StandardOpenOption.READ\u30aa\u30d7\u30b7\u30e7\u30f3\u3092\u4f7f\u3063\u3066\u8aad\u307f\u8fbc\u307f\u30e2\u30fc\u30c9\u3092\u6307\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u6b21\u306b\u3001ByteBuffer\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u30d0\u30c3\u30d5\u30a1\u3068\u3057\u30661024\u30d0\u30a4\u30c8\u306e\u30b5\u30a4\u30ba\u3067\u4f5c\u6210\u3057\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u30c1\u30e3\u30cd\u30eb\u304b\u3089\u30d0\u30c3\u30d5\u30a1\u306b\u30c7\u30fc\u30bf\u3092\u9806\u6b21\u8aad\u307f\u8fbc\u3080\u51e6\u7406\u3092\u3001\u8aad\u307f\u8fbc\u3093\u3060\u30d0\u30a4\u30c8\u6570\u304c-1\uff08\u30d5\u30a1\u30a4\u30eb\u306e\u7d42\u7aef\uff09\u306b\u306a\u308b\u307e\u3067\u7e70\u308a\u8fd4\u3057\u3066\u3044\u307e\u3059\u3002\u30eb\u30fc\u30d7\u306e\u4e2d\u3067\u306f\u3001\u30d0\u30c3\u30d5\u30a1\u3092buffer.flip()\u30e1\u30bd\u30c3\u30c9\u3067\u8aad\u307f\u8fbc\u307f\u30e2\u30fc\u30c9\u306b\u5207\u308a\u66ff\u3048\u3001buffer.hasRemaining()\u30e1\u30bd\u30c3\u30c9\u3067\u30d0\u30c3\u30d5\u30a1\u306b\u672a\u8aad\u307f\u8fbc\u307f\u306e\u30c7\u30fc\u30bf\u304c\u3042\u308b\u304b\u3069\u3046\u304b\u3092\u8abf\u3079\u3001\u6700\u5f8c\u306bbuffer.get()\u30e1\u30bd\u30c3\u30c9\u3067\u30c7\u30fc\u30bf\u30921\u30d0\u30a4\u30c8\u305a\u3064\u8aad\u307f\u8fbc\u3093\u3067\u51fa\u529b\u3057\u3066\u3044\u307e\u3059\u3002\u6700\u5f8c\u306bbuffer.clear()\u30e1\u30bd\u30c3\u30c9\u3067\u30d0\u30c3\u30d5\u30a1\u3092\u30af\u30ea\u30a2\u3057\u3001\u6b21\u306e\u30c7\u30fc\u30bf\u306e\u8aad\u307f\u8fbc\u307f\u306b\u5099\u3048\u3066\u3044\u307e\u3059\u3002<\/p>\n
\u30d5\u30a1\u30a4\u30eb\u64cd\u4f5c\u4ee5\u5916\u306b\u3082\u3001Java NIO \u306f\u30cd\u30c3\u30c8\u30ef\u30fc\u30af\u901a\u4fe1\u3084\u30e1\u30e2\u30ea\u30de\u30c3\u30d7\u578b\u30d5\u30a1\u30a4\u30eb\u306a\u3069\u3001\u3088\u308a\u591a\u304f\u306e\u6a5f\u80fd\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u307e\u3059\u3002Java NIO \u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001IO \u64cd\u4f5c\u306e\u52b9\u7387\u6027\u3068\u67d4\u8edf\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
Java NIO (New IO) \u306f\u3001Java 1.4 \u3067\u5c0e\u5165\u3055\u308c\u305f\u5f93\u6765\u306e Java IO \u3092\u7f6e\u304d\u63db\u3048\u308b\u305f\u3081\u306e\u65b0\u3057\u3044\u5165\u51fa\u529b API \u3067\u3059\u3002NIO \u306f\u3001\u3088\u308a\u52b9\u7387\u7684\u3067\u67d4\u8edf\u306a IO \u51e6\u7406\u65b9\u6cd5\u3092\u63d0\u4f9b\u3057\u3001\u975e\u30d6\u30ed\u30c3\u30ad\u30f3\u30b0 IO \u30e2 […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-125751","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n