“`”<\/p>\n
<h3>2.1 NIO \u7b80\u4ecb<\/h3><\/p>\n
NIO\u662f\u4e00\u79cd\u540c\u6b65\u975e\u963b\u585e\u7684I\/O\u6a21\u578b\uff0c\u5728Java 1.4 \u4e2d\u5f15\u5165\u4e86NIO\u6846\u67b6\uff0c\u5bf9\u5e94 java.nio \u5305\uff0c\u63d0\u4f9b\u4e86 Channel , Selector\uff0cBuffer\u7b49\u62bd\u8c61\u3002<\/p>\n
NIO\u4e2d\u7684N\u53ef\u4ee5\u7406\u89e3\u4e3aNon-blocking\uff0c\u4e0d\u5355\u7eaf\u662fNew\u3002\u5b83\u652f\u6301\u9762\u5411\u7f13\u51b2\u7684\uff0c\u57fa\u4e8e\u901a\u9053\u7684I\/O\u64cd\u4f5c\u65b9\u6cd5\u3002 NIO\u63d0\u4f9b\u4e86\u4e0e\u4f20\u7edfBIO\u6a21\u578b\u4e2d\u7684 <code>Socket<\/code> \u548c <code>ServerSocket<\/code> \u76f8\u5bf9\u5e94\u7684 <code>SocketChannel<\/code> \u548c <code>ServerSocketChannel<\/code> \u4e24\u79cd\u4e0d\u540c\u7684\u5957\u63a5\u5b57\u901a\u9053\u5b9e\u73b0,\u4e24\u79cd\u901a\u9053\u90fd\u652f\u6301\u963b\u585e\u548c\u975e\u963b\u585e\u4e24\u79cd\u6a21\u5f0f\u3002\u963b\u585e\u6a21\u5f0f\u4f7f\u7528\u5c31\u50cf\u4f20\u7edf\u4e2d\u7684\u652f\u6301\u4e00\u6837\uff0c\u6bd4\u8f83\u7b80\u5355\uff0c\u4f46\u662f\u6027\u80fd\u548c\u53ef\u9760\u6027\u90fd\u4e0d\u597d\uff1b\u975e\u963b\u585e\u6a21\u5f0f\u6b63\u597d\u4e0e\u4e4b\u76f8\u53cd\u3002\u5bf9\u4e8e\u4f4e\u8d1f\u8f7d\u3001\u4f4e\u5e76\u53d1\u7684\u5e94\u7528\u7a0b\u5e8f\uff0c\u53ef\u4ee5\u4f7f\u7528\u540c\u6b65\u963b\u585eI\/O\u6765\u63d0\u5347\u5f00\u53d1\u901f\u7387\u548c\u66f4\u597d\u7684\u7ef4\u62a4\u6027\uff1b\u5bf9\u4e8e\u9ad8\u8d1f\u8f7d\u3001\u9ad8\u5e76\u53d1\u7684\uff08\u7f51\u7edc\uff09\u5e94\u7528\uff0c\u5e94\u4f7f\u7528 NIO \u7684\u975e\u963b\u585e\u6a21\u5f0f\u6765\u5f00\u53d1\u3002<\/p><\/p>\n
<h3>2.2 NIO\u7684\u7279\u6027\/NIO\u4e0eIO\u533a\u522b<\/h3><\/p>\n
\u5982\u679c\u662f\u5728\u9762\u8bd5\u4e2d\u56de\u7b54\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u89c9\u5f97\u9996\u5148\u80af\u5b9a\u8981\u4ece NIO \u6d41\u662f\u975e\u963b\u585e IO \u800c IO \u6d41\u662f\u963b\u585e IO \u8bf4\u8d77\u3002\u7136\u540e\uff0c\u53ef\u4ee5\u4ece NIO \u76843\u4e2a\u6838\u5fc3\u7ec4\u4ef6\/\u7279\u6027\u4e3a NIO \u5e26\u6765\u7684\u4e00\u4e9b\u6539\u8fdb\u6765\u5206\u6790\u3002\u5982\u679c\uff0c\u4f60\u628a\u8fd9\u4e9b\u90fd\u56de\u7b54\u4e0a\u4e86\u6211\u89c9\u5f97\u4f60\u5bf9\u4e8e NIO \u5c31\u6709\u4e86\u66f4\u4e3a\u6df1\u5165\u4e00\u70b9\u7684\u8ba4\u8bc6\uff0c\u9762\u8bd5\u5b98\u95ee\u5230\u4f60\u8fd9\u4e2a\u95ee\u9898\uff0c\u4f60\u4e5f\u80fd\u5f88\u8f7b\u677e\u7684\u56de\u7b54\u4e0a\u6765\u4e86\u3002<\/p>\n
<h4>1)Non-blocking IO\uff08\u975e\u963b\u585eIO\uff09<\/h4><\/p>\n
<strong>IO\u6d41\u662f\u963b\u585e\u7684\uff0cNIO\u6d41\u662f\u4e0d\u963b\u585e\u7684\u3002<\/strong><\/p>\n
Java NIO\u4f7f\u6211\u4eec\u53ef\u4ee5\u8fdb\u884c\u975e\u963b\u585eIO\u64cd\u4f5c\u3002\u6bd4\u5982\u8bf4\uff0c\u5355\u7ebf\u7a0b\u4e2d\u4ece\u901a\u9053\u8bfb\u53d6\u6570\u636e\u5230buffer\uff0c\u540c\u65f6\u53ef\u4ee5\u7ee7\u7eed\u505a\u522b\u7684\u4e8b\u60c5\uff0c\u5f53\u6570\u636e\u8bfb\u53d6\u5230buffer\u4e2d\u540e\uff0c\u7ebf\u7a0b\u518d\u7ee7\u7eed\u5904\u7406\u6570\u636e\u3002\u5199\u6570\u636e\u4e5f\u662f\u4e00\u6837\u7684\u3002\u53e6\u5916\uff0c\u975e\u963b\u585e\u5199\u4e5f\u662f\u5982\u6b64\u3002\u4e00\u4e2a\u7ebf\u7a0b\u8bf7\u6c42\u5199\u5165\u4e00\u4e9b\u6570\u636e\u5230\u67d0\u901a\u9053\uff0c\u4f46\u4e0d\u9700\u8981\u7b49\u5f85\u5b83\u5b8c\u5168\u5199\u5165\uff0c\u8fd9\u4e2a\u7ebf\u7a0b\u540c\u65f6\u53ef\u4ee5\u53bb\u505a\u522b\u7684\u4e8b\u60c5\u3002<\/p>\n
Java IO\u7684\u5404\u79cd\u6d41\u662f\u963b\u585e\u7684\u3002\u8fd9\u610f\u5473\u7740\uff0c\u5f53\u4e00\u4e2a\u7ebf\u7a0b\u8c03\u7528 <code>read()<\/code> \u6216 <code>write()<\/code> \u65f6\uff0c\u8be5\u7ebf\u7a0b\u88ab\u963b\u585e\uff0c\u76f4\u5230\u6709\u4e00\u4e9b\u6570\u636e\u88ab\u8bfb\u53d6\uff0c\u6216\u6570\u636e\u5b8c\u5168\u5199\u5165\u3002\u8be5\u7ebf\u7a0b\u5728\u6b64\u671f\u95f4\u4e0d\u80fd\u518d\u5e72\u4efb\u4f55\u4e8b\u60c5\u4e86<\/p>\n
<h4>2)Buffer(\u7f13\u51b2\u533a)<\/h4><\/p>\n
<strong>IO \u9762\u5411\u6d41(Stream oriented)\uff0c\u800c NIO \u9762\u5411\u7f13\u51b2\u533a(Buffer oriented)\u3002<\/strong><\/p>\n
Buffer\u662f\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5b83\u5305\u542b\u4e00\u4e9b\u8981\u5199\u5165\u6216\u8005\u8981\u8bfb\u51fa\u7684\u6570\u636e\u3002\u5728NIO\u7c7b\u5e93\u4e2d\u52a0\u5165Buffer\u5bf9\u8c61\uff0c\u4f53\u73b0\u4e86\u65b0\u5e93\u4e0e\u539fI\/O\u7684\u4e00\u4e2a\u91cd\u8981\u533a\u522b\u3002\u5728\u9762\u5411\u6d41\u7684I\/O\u4e2d\u00b7\u53ef\u4ee5\u5c06\u6570\u636e\u76f4\u63a5\u5199\u5165\u6216\u8005\u5c06\u6570\u636e\u76f4\u63a5\u8bfb\u5230 Stream \u5bf9\u8c61\u4e2d\u3002\u867d\u7136 Stream \u4e2d\u4e5f\u6709 Buffer \u5f00\u5934\u7684\u6269\u5c55\u7c7b\uff0c\u4f46\u53ea\u662f\u6d41\u7684\u5305\u88c5\u7c7b\uff0c\u8fd8\u662f\u4ece\u6d41\u8bfb\u5230\u7f13\u51b2\u533a\uff0c\u800c NIO \u5374\u662f\u76f4\u63a5\u8bfb\u5230 Buffer \u4e2d\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n
\u5728NIO\u538d\u4e2d\uff0c\u6240\u6709\u6570\u636e\u90fd\u662f\u7528\u7f13\u51b2\u533a\u5904\u7406\u7684\u3002\u5728\u8bfb\u53d6\u6570\u636e\u65f6\uff0c\u5b83\u662f\u76f4\u63a5\u8bfb\u5230\u7f13\u51b2\u533a\u4e2d\u7684; \u5728\u5199\u5165\u6570\u636e\u65f6\uff0c\u5199\u5165\u5230\u7f13\u51b2\u533a\u4e2d\u3002\u4efb\u4f55\u65f6\u5019\u8bbf\u95eeNIO\u4e2d\u7684\u6570\u636e\uff0c\u90fd\u662f\u901a\u8fc7\u7f13\u51b2\u533a\u8fdb\u884c\u64cd\u4f5c\u3002<\/p>\n
\u6700\u5e38\u7528\u7684\u7f13\u51b2\u533a\u662f ByteBuffer,\u4e00\u4e2a ByteBuffer \u63d0\u4f9b\u4e86\u4e00\u7ec4\u529f\u80fd\u7528\u4e8e\u64cd\u4f5c byte \u6570\u7ec4\u3002\u9664\u4e86ByteBuffer,\u8fd8\u6709\u5176\u4ed6\u7684\u4e00\u4e9b\u7f13\u51b2\u533a\uff0c\u4e8b\u5b9e\u4e0a\uff0c\u6bcf\u4e00\u79cdJava\u57fa\u672c\u7c7b\u578b\uff08\u9664\u4e86Boolean\u7c7b\u578b\uff09\u90fd\u5bf9\u5e94\u6709\u4e00\u79cd\u7f13\u51b2\u533a\u3002<\/p>\n
<h4>3)Channel (\u901a\u9053)<\/h4><\/p>\n
NIO \u901a\u8fc7Channel\uff08\u901a\u9053\uff09 \u8fdb\u884c\u8bfb\u5199\u3002<\/p>\n
\u901a\u9053\u662f\u53cc\u5411\u7684\uff0c\u53ef\u8bfb\u4e5f\u53ef\u5199\uff0c\u800c\u6d41\u7684\u8bfb\u5199\u662f\u5355\u5411\u7684\u3002\u65e0\u8bba\u8bfb\u5199\uff0c\u901a\u9053\u53ea\u80fd\u548cBuffer\u4ea4\u4e92\u3002\u56e0\u4e3a Buffer\uff0c\u901a\u9053\u53ef\u4ee5\u5f02\u6b65\u5730\u8bfb\u5199\u3002<\/p>\n
<h4>4)Selector (\u9009\u62e9\u5668)<\/h4><\/p>\n
NIO\u6709\u9009\u62e9\u5668\uff0c\u800cIO\u6ca1\u6709\u3002<\/p>\n
\u9009\u62e9\u5668\u7528\u4e8e\u4f7f\u7528\u5355\u4e2a\u7ebf\u7a0b\u5904\u7406\u591a\u4e2a\u901a\u9053\u3002\u56e0\u6b64\uff0c\u5b83\u9700\u8981\u8f83\u5c11\u7684\u7ebf\u7a0b\u6765\u5904\u7406\u8fd9\u4e9b\u901a\u9053\u3002\u7ebf\u7a0b\u4e4b\u95f4\u7684\u5207\u6362\u5bf9\u4e8e\u64cd\u4f5c\u7cfb\u7edf\u6765\u8bf4\u662f\u6602\u8d35\u7684\u3002 \u56e0\u6b64\uff0c\u4e3a\u4e86\u63d0\u9ad8\u7cfb\u7edf\u6548\u7387\u9009\u62e9\u5668\u662f\u6709\u7528\u7684\u3002<\/p>\n
<img alt=""\u4e00\u4e2a\u5355\u7ebf\u7a0b\u4e2dSelector\u7ef4\u62a43\u4e2aChannel\u7684\u793a\u610f\u56fe"" src=""https:\/\/my-blog-to-use.oss-cn-beijing.aliyuncs.com\/2019-2\/Slector.png"" style=""width: 100%;""><\/p>\n
<h3>2.3 NIO \u8bfb\u6570\u636e\u548c\u5199\u6570\u636e\u65b9\u5f0f<\/h3><\/p>\n
\u901a\u5e38\u6765\u8bf4NIO\u4e2d\u7684\u6240\u6709IO\u90fd\u662f\u4ece Channel\uff08\u901a\u9053\uff09 \u5f00\u59cb\u7684\u3002<\/p>\n
<ul><li>\u4ece\u901a\u9053\u8fdb\u884c\u6570\u636e\u8bfb\u53d6 \uff1a\u521b\u5efa\u4e00\u4e2a\u7f13\u51b2\u533a\uff0c\u7136\u540e\u8bf7\u6c42\u901a\u9053\u8bfb\u53d6\u6570\u636e\u3002<\/li><li>\u4ece\u901a\u9053\u8fdb\u884c\u6570\u636e\u5199\u5165 \uff1a\u521b\u5efa\u4e00\u4e2a\u7f13\u51b2\u533a\uff0c\u586b\u5145\u6570\u636e\uff0c\u5e76\u8981\u6c42\u901a\u9053\u5199\u5165\u6570\u636e\u3002<\/li><\/ul><\/p>\n
\u6570\u636e\u8bfb\u53d6\u548c\u5199\u5165\u64cd\u4f5c\u56fe\u793a\uff1a<\/p>\n
<img alt=""NIO\u8bfb\u5199\u6570\u636e\u7684\u65b9\u5f0f"" src=""https:\/\/my-blog-to-use.oss-cn-beijing.aliyuncs.com\/2019-2\/NIO\u8bfb\u5199\u6570\u636e\u7684\u65b9\u5f0f.png"" style=""width: 100%;""><\/p>\n
<h3>2.4 NIO\u6838\u5fc3\u7ec4\u4ef6\u7b80\u5355\u4ecb\u7ecd<\/h3><\/p>\n
NIO \u5305\u542b\u4e0b\u9762\u51e0\u4e2a\u6838\u5fc3\u7684\u7ec4\u4ef6\uff1a<\/p>\n
<ul><li>Channel(\u901a\u9053)<\/li><li>Buffer(\u7f13\u51b2\u533a)<\/li><li>Selector(\u9009\u62e9\u5668)<\/li><\/ul><\/p>\n
\u6574\u4e2aNIO\u4f53\u7cfb\u5305\u542b\u7684\u7c7b\u8fdc\u8fdc\u4e0d\u6b62\u8fd9\u4e09\u4e2a\uff0c\u53ea\u80fd\u8bf4\u8fd9\u4e09\u4e2a\u662fNIO\u4f53\u7cfb\u7684\u201c\u6838\u5fc3API\u201d\u3002\u6211\u4eec\u4e0a\u9762\u5df2\u7ecf\u5bf9\u8fd9\u4e09\u4e2a\u6982\u5ff5\u8fdb\u884c\u4e86\u57fa\u672c\u7684\u9610\u8ff0\uff0c\u8fd9\u91cc\u5c31\u4e0d\u591a\u505a\u89e3\u91ca\u4e86\u3002<\/p>\n
<h3>2.5 \u4ee3\u7801\u793a\u4f8b<\/h3><\/p>\n
\u4ee3\u7801\u793a\u4f8b\u51fa\u81ea\u95ea\u7535\u4fa0\u7684\u535a\u5ba2\uff0c\u539f\u5730\u5740\u5982\u4e0b\uff1a<\/p>\n
<a href=""https:\/\/www.jianshu.com\/p\/a4e03835921a"">https:\/\/www.jianshu.com\/p\/a4e03835921a<\/a><\/p>\n
\u4e3a\u4ec0\u4e48\u5927\u5bb6\u90fd\u4e0d\u613f\u610f\u7528 JDK \u539f\u751f NIO \u8fdb\u884c\u5f00\u53d1\u5462\uff1f\u4ece\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\u5927\u5bb6\u90fd\u53ef\u4ee5\u770b\u51fa\u6765\uff0c\u662f\u771f\u7684\u96be\u7528\uff01\u9664\u4e86\u7f16\u7a0b\u590d\u6742\u3001\u7f16\u7a0b\u6a21\u578b\u96be\u4e4b\u5916\uff0c\u5b83\u8fd8\u6709\u4ee5\u4e0b\u8ba9\u4eba\u8bdf\u75c5\u7684\u95ee\u9898\uff1a<\/p>\n
<ul><li>JDK \u7684 NIO \u5e95\u5c42\u7531 epoll \u5b9e\u73b0\uff0c\u8be5\u5b9e\u73b0\u9971\u53d7\u8bdf\u75c5\u7684\u7a7a\u8f6e\u8be2 bug \u4f1a\u5bfc\u81f4 cpu \u98d9\u5347 100%<\/li><li>\u9879\u76ee\u5e9e\u5927\u4e4b\u540e\uff0c\u81ea\u884c\u5b9e\u73b0\u7684 NIO \u5f88\u5bb9\u6613\u51fa\u73b0\u5404\u7c7b bug\uff0c\u7ef4\u62a4\u6210\u672c\u8f83\u9ad8\uff0c\u4e0a\u9762\u8fd9\u4e00\u5768\u4ee3\u7801\u6211\u90fd\u4e0d\u80fd\u4fdd\u8bc1\u6ca1\u6709 bug<\/li><\/ul><\/p>\n
Netty \u7684\u51fa\u73b0\u5f88\u5927\u7a0b\u5ea6\u4e0a\u6539\u5584\u4e86 JDK \u539f\u751f NIO \u6240\u5b58\u5728\u7684\u4e00\u4e9b\u8ba9\u4eba\u96be\u4ee5\u5fcd\u53d7\u7684\u95ee\u9898\u3002<\/p>\n
<pre><code> "“`
\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
“`” <h3>2.1 NIO \u7b80\u4ecb<\/h3> NIO\u662f\u4e00\u79cd\u540c […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-37386","post","type-post","status-publish","format-standard","hentry","category-c"],"_links":{"self":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37386","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/users\/7"}],"replies":[{"embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/comments?post=37386"}],"version-history":[{"count":1,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37386\/revisions"}],"predecessor-version":[{"id":37387,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/posts\/37386\/revisions\/37387"}],"wp:attachment":[{"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/media?parent=37386"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/categories?post=37386"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/wx.kaifamiao.info\/index.php\/wp-json\/wp\/v2\/tags?post=37386"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}