Java\u306e\u30d5\u30a1\u30a4\u30eb\u30b3\u30d4\u30fc\u306f\u975e\u5e38\u306b\u4e00\u822c\u7684\u306a\u64cd\u4f5c\u3067\u3059\u3002\u3057\u304b\u3057\u3001java.io.File\u30af\u30e9\u30b9\u306b\u306f\u30d5\u30a1\u30a4\u30eb\u3092\u30bd\u30fc\u30b9\u304b\u3089\u5b9b\u5148\u306b\u30b3\u30d4\u30fc\u3059\u308b\u305f\u3081\u306e\u30b7\u30e7\u30fc\u30c8\u30ab\u30c3\u30c8\u30e1\u30bd\u30c3\u30c9\u306f\u5b58\u5728\u3057\u307e\u305b\u3093\u3002\u3053\u3053\u3067\u306f\u3001Java\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u30b3\u30d4\u30fc\u3059\u308b\u305f\u3081\u306e4\u3064\u306e\u7570\u306a\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u5b66\u3073\u307e\u3059\u3002<\/p>\n
\u3053\u308c\u306fJava\u3067\u306e\u30d5\u30a1\u30a4\u30eb\u30b3\u30d4\u30fc\u306e\u4e00\u822c\u7684\u306a\u65b9\u6cd5\u3067\u3059\u3002\u3053\u3053\u3067\u306f\u3001\u30bd\u30fc\u30b9\u3068\u5b9b\u5148\u306e2\u3064\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u6b21\u306b\u3001\u30bd\u30fc\u30b9\u304b\u3089InputStream\u3092\u4f5c\u6210\u3057\u3001Java\u306e\u30d5\u30a1\u30a4\u30eb\u30b3\u30d4\u30fc\u64cd\u4f5c\u306b\u4f7f\u7528\u3059\u308b\u305f\u3081\u306bOutputStream\u3092\u4f7f\u7528\u3057\u3066\u5b9b\u5148\u30d5\u30a1\u30a4\u30eb\u306b\u66f8\u304d\u8fbc\u307f\u307e\u3059\u3002\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u4f7f\u7528\u3057\u3066Java\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u30b3\u30d4\u30fc\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3067\u304d\u308b\u30e1\u30bd\u30c3\u30c9\u306f\u6b21\u306e\u3068\u304a\u308a\u3067\u3059\u3002<\/p>\n
private static void copyFileUsingStream(File source, File dest) throws IOException {\r\n InputStream is = null;\r\n OutputStream os = null;\r\n try {\r\n is = new FileInputStream(source);\r\n os = new FileOutputStream(dest);\r\n byte[] buffer = new byte[1024];\r\n int length;\r\n while ((length = is.read(buffer)) > 0) {\r\n os.write(buffer, 0, length);\r\n }\r\n } finally {\r\n is.close();\r\n os.close();\r\n }\r\n}\r\n<\/code><\/pre>\nJava \u306e\u30d5\u30a1\u30a4\u30eb\u30b3\u30d4\u30fc – java.nio.channels.FileChannel<\/ol>\nJava NIO\u30af\u30e9\u30b9\u306fJava 1.4\u3067\u5c0e\u5165\u3055\u308c\u3001FileChannel\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u30b3\u30d4\u30fc\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002transferFrom\uff08\uff09\u30e1\u30bd\u30c3\u30c9\u306ejavadoc\u306b\u3088\u308b\u3068\u3001\u3053\u306e\u65b9\u6cd5\u306f\u3001Java\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u30b3\u30d4\u30fc\u3059\u308b\u305f\u3081\u306e\u30b9\u30c8\u30ea\u30fc\u30e0\u3088\u308a\u3082\u901f\u304f\u306a\u308b\u306f\u305a\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u3001FileChannel\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u30b3\u30d4\u30fc\u3059\u308b\u305f\u3081\u306e\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
private static void copyFileUsingChannel(File source, File dest) throws IOException {\r\n FileChannel sourceChannel = null;\r\n FileChannel destChannel = null;\r\n try {\r\n sourceChannel = new FileInputStream(source).getChannel();\r\n destChannel = new FileOutputStream(dest).getChannel();\r\n destChannel.transferFrom(sourceChannel, 0, sourceChannel.size());\r\n }finally{\r\n sourceChannel.close();\r\n destChannel.close();\r\n }\r\n}\r\n<\/code><\/pre>\nJava \u30b3\u30d4\u30fc \u30d5\u30a1\u30a4\u30eb – Apache Commons IO FileUtils<\/ol>\nApache Commons IO\u306eFileUtils.copyFile(File srcFile, File destFile)\u30e1\u30bd\u30c3\u30c9\u306f\u3001Java\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u30b3\u30d4\u30fc\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u65e2\u306bApache Commons IO\u3092\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u4f7f\u7528\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001\u30b3\u30fc\u30c9\u306e\u30b7\u30f3\u30d7\u30eb\u3055\u306e\u305f\u3081\u306b\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u306f\u7406\u306b\u304b\u306a\u3063\u3066\u3044\u307e\u3059\u3002\u5185\u90e8\u7684\u306b\u306fJava NIO\u306eFileChannel\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u305f\u3081\u3001\u4ed6\u306e\u6a5f\u80fd\u3067\u65e2\u306b\u4f7f\u7528\u3057\u3066\u3044\u306a\u3044\u5834\u5408\u306f\u3001\u3053\u306e\u30e9\u30c3\u30d1\u30fc\u30e1\u30bd\u30c3\u30c9\u3092\u907f\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u4ee5\u4e0b\u306f\u3001Java\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u30b3\u30d4\u30fc\u3059\u308b\u305f\u3081\u306bApache Commons IO\u3092\u4f7f\u7528\u3059\u308b\u65b9\u6cd5\u3067\u3059\u3002<\/p>\n
private static void copyFileUsingApacheCommonsIO(File source, File dest) throws IOException {\r\n FileUtils.copyFile(source, dest);\r\n}\r\n<\/code><\/pre>\nJava\u306e\u30d5\u30a1\u30a4\u30eb\u30b3\u30d4\u30fc – Files\u30af\u30e9\u30b9<\/ol>\n\u3082\u3057Java 7\u4ee5\u4e0a\u3067\u4f5c\u696d\u3057\u3066\u3044\u308b\u5834\u5408\u306f\u3001Java\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u30b3\u30d4\u30fc\u3059\u308b\u305f\u3081\u306bFiles\u30af\u30e9\u30b9\u306ecopy()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u30d5\u30a1\u30a4\u30eb\u30b7\u30b9\u30c6\u30e0\u306e\u30d7\u30ed\u30d0\u30a4\u30c0\u3092\u4f7f\u7528\u3057\u3066\u30d5\u30a1\u30a4\u30eb\u3092\u30b3\u30d4\u30fc\u3057\u307e\u3059\u3002<\/p>\n
private static void copyFileUsingJava7Files(File source, File dest) throws IOException {\r\n Files.copy(source.toPath(), dest.toPath());\r\n}\r\n<\/code><\/pre>\n\u6700\u901f\u306e\u65b9\u6cd5\u3092\u898b\u3064\u3051\u308b\u305f\u3081\u306b\u30011GB\u306e\u30d5\u30a1\u30a4\u30eb\u3092\u30b3\u30d4\u30fc\u3059\u308b\u30c6\u30b9\u30c8\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3057\u3001\u4e0a\u8a18\u306e\u65b9\u6cd5\u3092\u4e00\u3064\u305a\u3064\u5b9f\u884c\u3057\u307e\u3057\u305f\u3002\u5404\u547c\u3073\u51fa\u3057\u3067\u306f\u3001\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u5f71\u97ff\u3092\u907f\u3051\u308b\u305f\u3081\u306b\u7570\u306a\u308b\u30d5\u30a1\u30a4\u30eb\u3092\u4f7f\u7528\u3057\u307e\u3057\u305f\u3002<\/p>\n
package com.scdev.files;\r\n\r\nimport java.io.File;\r\nimport java.io.FileInputStream;\r\nimport java.io.FileOutputStream;\r\nimport java.io.IOException;\r\nimport java.io.InputStream;\r\nimport java.io.OutputStream;\r\nimport java.nio.channels.FileChannel;\r\nimport java.nio.file.Files;\r\n\r\nimport org.apache.commons.io.FileUtils;\r\n\r\npublic class JavaCopyFile {\r\n\r\n public static void main(String[] args) throws InterruptedException, IOException {\r\n File source = new File(\"\/Users\/scdev\/tmp\/source.avi\");\r\n File dest = new File(\"\/Users\/scdev\/tmp\/dest.avi\");\r\n\r\n \/\/copy file conventional way using Stream\r\n long start = System.nanoTime();\r\n copyFileUsingStream(source, dest);\r\n System.out.println(\"Time taken by Stream Copy = \"+(System.nanoTime()-start));\r\n \r\n \/\/copy files using java.nio FileChannel\r\n source = new File(\"\/Users\/scdev\/tmp\/sourceChannel.avi\");\r\n dest = new File(\"\/Users\/scdev\/tmp\/destChannel.avi\");\r\n start = System.nanoTime();\r\n copyFileUsingChannel(source, dest);\r\n System.out.println(\"Time taken by Channel Copy = \"+(System.nanoTime()-start));\r\n \r\n \/\/copy files using apache commons io\r\n source = new File(\"\/Users\/scdev\/tmp\/sourceApache.avi\");\r\n dest = new File(\"\/Users\/scdev\/tmp\/destApache.avi\");\r\n start = System.nanoTime();\r\n copyFileUsingApacheCommonsIO(source, dest);\r\n System.out.println(\"Time taken by Apache Commons IO Copy = \"+(System.nanoTime()-start));\r\n \r\n \/\/using Java 7 Files class\r\n source = new File(\"\/Users\/scdev\/tmp\/sourceJava7.avi\");\r\n dest = new File(\"\/Users\/scdev\/tmp\/destJava7.avi\");\r\n start = System.nanoTime();\r\n copyFileUsingJava7Files(source, dest);\r\n System.out.println(\"Time taken by Java7 Files Copy = \"+(System.nanoTime()-start)); \r\n }\r\n}\r\n<\/code><\/pre>\n\u4e0a\u8a18\u306e\u30d7\u30ed\u30b0\u30e9\u30e0\u306e\u51fa\u529b\u3067\u3059\u3002Java\u30d5\u30a1\u30a4\u30eb\u306e\u30b3\u30d4\u30fc\u64cd\u4f5c\u306b\u306f\u5e38\u306b1\u3064\u306e\u30e1\u30bd\u30c3\u30c9\u3057\u304b\u4f7f\u7528\u3057\u306a\u3044\u3088\u3046\u306b\u3001\u4e0a\u8a18\u306e\u30b3\u30fc\u30c9\u306b\u30b3\u30e1\u30f3\u30c8\u3092\u8ffd\u52a0\u3057\u307e\u3057\u305f\u3002<\/p>\n
Time taken by Stream Copy = 44582575000\r\nTime taken by Channel Copy = 104138195000\r\nTime taken by Apache Commons IO Copy = 108396714000\r\nTime taken by Java7 Files Copy = 89061578000\r\n<\/code><\/pre>\n\u51fa\u529b\u304b\u3089\u660e\u3089\u304b\u306b\u3001Java\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u30b3\u30d4\u30fc\u3059\u308b\u6700\u826f\u306e\u65b9\u6cd5\u306f\u300cStream Copy\u300d\u3067\u3059\u3002\u305f\u3060\u3057\u3001\u3053\u308c\u306f\u975e\u5e38\u306b\u57fa\u672c\u7684\u306a\u30c6\u30b9\u30c8\u3067\u3059\u3002\u3082\u3057\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u96c6\u4e2d\u3057\u305f\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u53d6\u308a\u7d44\u3093\u3067\u3044\u308b\u5834\u5408\u306f\u3001\u7570\u306a\u308b\u65b9\u6cd5\u3092\u8a66\u3057\u3066\u3001\u30bf\u30a4\u30df\u30f3\u30b0\u3092\u8a18\u9332\u3057\u3066\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u306b\u6700\u9069\u306a\u30a2\u30d7\u30ed\u30fc\u30c1\u3092\u898b\u3064\u3051\u308b\u3079\u304d\u3067\u3059\u3002\u307e\u305f\u3001\u30d5\u30a1\u30a4\u30eb\u306e\u5e73\u5747\u30b5\u30a4\u30ba\u306b\u57fa\u3065\u3044\u3066\u3001\u7570\u306a\u308b\u65b9\u6cd5\u3067Java\u306e\u30d5\u30a1\u30a4\u30eb\u30b3\u30d4\u30fc\u3092\u8a66\u3059\u3053\u3068\u3082\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002Java\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u30b3\u30d4\u30fc\u3059\u308b4\u3064\u306e\u65b9\u6cd5\u306b\u3064\u3044\u3066YouTube\u306e\u30d3\u30c7\u30aa\u3092\u4f5c\u6210\u3057\u307e\u3057\u305f\u306e\u3067\u3001\u8208\u5473\u304c\u3042\u308c\u3070\u3054\u89a7\u304f\u3060\u3055\u3044\u3002https:\/\/www.youtube.com\/watch?v=op6tgG95zek<\/p>\n","protected":false},"excerpt":{"rendered":"
Java\u306e\u30d5\u30a1\u30a4\u30eb\u30b3\u30d4\u30fc\u306f\u975e\u5e38\u306b\u4e00\u822c\u7684\u306a\u64cd\u4f5c\u3067\u3059\u3002\u3057\u304b\u3057\u3001java.io.File\u30af\u30e9\u30b9\u306b\u306f\u30d5\u30a1\u30a4\u30eb\u3092\u30bd\u30fc\u30b9\u304b\u3089\u5b9b\u5148\u306b\u30b3\u30d4\u30fc\u3059\u308b\u305f\u3081\u306e\u30b7\u30e7\u30fc\u30c8\u30ab\u30c3\u30c8\u30e1\u30bd\u30c3\u30c9\u306f\u5b58\u5728\u3057\u307e\u305b\u3093\u3002\u3053\u3053\u3067\u306f\u3001Java\u3067\u30d5\u30a1\u30a4\u30eb\u3092\u30b3\u30d4\u30fc\u3059\u308b\u305f\u3081\u306e4 […]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-951","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"\n
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