{"id":153,"date":"2025-07-21T20:03:39","date_gmt":"2025-07-21T12:03:39","guid":{"rendered":"http:\/\/192.140.166.102\/?p=153"},"modified":"2025-08-31T09:49:39","modified_gmt":"2025-08-31T01:49:39","slug":"io%e6%b5%81-%e5%ad%97%e8%8a%82%e6%b5%81","status":"publish","type":"post","link":"https:\/\/lsuccess.xyz\/index.php\/2025\/07\/21\/io%e6%b5%81-%e5%ad%97%e8%8a%82%e6%b5%81\/","title":{"rendered":"IO\u6d41"},"content":{"rendered":"\n<ul class=\"wp-block-list\">\n<li>FileOutputStream<\/li>\n\n\n\n<li>FileInputStream<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u592a\u4e45\u6574\u7406IO\u6d41\u6211\u6709\u4e9b\u5c0f\u5fd8\u8bb0\u4e86\uff0c\u7a0d\u5fae\u6574\u7406\u4e00\u4e0b\u3002\u5bf9\u6d41\u7684\u64cd\u4f5c\u53ef\u4ee5\u5206\u4e3a\u5bf9\u5b57\u8282\u64cd\u4f5c\u4e5f\u53ef\u4ee5\u5206\u4e3a\u5bf9\u5b57\u7b26\u64cd\u4f5c\uff0c\u5982\u679c\u662f\u5bf9\u5b57\u7b26\u64cd\u4f5c\u7684\u8bdd\u5c31\u662f\u5b57\u7b26\u4e32\u7c7b\u578b\u7684\u4e86\uff0c\u5bf9\u5b57\u8282\u64cd\u4f5c\u7684\u8bdd\u8fd8\u4f1a\u6709\u5f71\u50cf\uff0c\u56fe\u7247\u7b49\u5185\u5bb9\u3002\u5b57\u8282\u6d41\u7684\u4e24\u4e2a\u7236\u7c7b\u662fOutPUtSream\u548cInPutStream\uff0c\u6211\u4eec\u5148\u4ecb\u7ecdOutPutStream\u6700\u7b80\u5355\u7684\u5b50\u7c7bFileOutPutStream\u3002\uff08\u6839\u636e\u83ab\u540d\u5176\u5999\u589e\u52a0\u7684\u70b9\u51fb\u91cf\u6765\u770b\uff0c\u5927\u5bb6\u66f4\u559c\u6b22\u770b\u8fd9\u90e8\u5206\u7684\u5185\u5bb9\uff0c\u4f46\u8fd9\u4e2a\u90e8\u5206\u7684\u5185\u5bb9\u6211\u6ca1\u5199\u5b8c\uff0c\u8fd8\u6709\u5f88\u591a\u5185\u5bb9\u6211\u90fd\u6ca1\u5199\u5462\uff09<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">FileOutputStream<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u5148\u4ecb\u7ecd\u4e00\u4e0bOutputStream\u7684\u5171\u6027\u65b9\u6cd5<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>close()<\/code>&nbsp;\uff1a\u5173\u95ed\u6b64\u8f93\u51fa\u6d41\u5e76\u91ca\u653e\u4e0e\u6b64\u6d41\u76f8\u5173\u8054\u7684\u7cfb\u7edf\u8d44\u6e90\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">&nbsp;<code>flush()<\/code>&nbsp;\uff1a\u5237\u65b0\u6b64\u8f93\u51fa\u6d41\u5e76\u5f3a\u5236\u7f13\u51b2\u533a\u7684\u5b57\u8282\u88ab\u5199\u5165\u5230\u76ee\u7684\u5730\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>write(byte[] b)<\/code>\uff1a\u5c06 b.length \u4e2a\u5b57\u8282\u4ece\u6307\u5b9a\u7684\u5b57\u8282\u6570\u7ec4\u5199\u5165\u6b64\u8f93\u51fa\u6d41\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>write(byte[] b, int off, int len)<\/code>&nbsp;\uff1a\u4ece\u6307\u5b9a\u7684\u5b57\u8282\u6570\u7ec4\u5199\u5165 len \u5b57\u8282\u5230\u6b64\u8f93\u51fa\u6d41\uff0c\u4ece\u504f\u79fb\u91cf off\u5f00\u59cb\u3002&nbsp;<strong>\u4e5f\u5c31\u662f\u8bf4\u4eceoff\u4e2a\u5b57\u8282\u6570\u5f00\u59cb\u4e00\u76f4\u5230len\u4e2a\u5b57\u8282\u7ed3\u675f<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u987e\u540d\u601d\u4e49\u662f\u5bf9\u6587\u4ef6\u5185\u5bb9\u8fdb\u884c\u64cd\u4f5c\u7684\u8f93\u51fa\u6d41\uff0c\u5c31\u662f\u8981\u5199\u4e1c\u897f\u8fdb\u6587\u4ef6\u91cc\u9762\uff0c\u4f46\u6ce8\u610f\uff0c\u6211\u9996\u5148\u4ecb\u7ecd\u7684\u65b9\u6cd5\u5199\u5165\u4f1a\u76f4\u63a5\u8986\u76d6\u6587\u4ef6\u4e2d\u539f\u672c\u7684\u5185\u5bb9\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0b\u662f\u4e24\u79cd\u6784\u9020\u65b9\u6cd5<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">String fileName = &#8220;example.txt&#8221;;<br>FileOutputStream fos = new FileOutputStream(fileName);<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0a\u4ee3\u7801\u4f7f\u7528\u6587\u4ef6\u540d &#8220;example.txt&#8221; \u521b\u5efa\u4e00\u4e2a FileOutputStream \u5bf9\u8c61\uff0c\u5c06\u6570\u636e\u5199\u5165\u5230\u8be5\u6587\u4ef6\u4e2d\u3002<strong>\u5982\u679c\u6587\u4ef6\u4e0d\u5b58\u5728\uff0c\u5219\u521b\u5efa\u4e00\u4e2a\u65b0\u6587\u4ef6\uff1b\u5982\u679c\u6587\u4ef6\u5df2\u7ecf\u5b58\u5728\uff0c\u5219\u8986\u76d6\u539f\u6709\u6587\u4ef6<\/strong>\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">File file = new File(&#8220;example.txt&#8221;);<br>FileOutputStream fos = new FileOutputStream(file);<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ece\u6587\u4ef6\u672b\u5c3e\u6dfb\u52a0\u5185\u5bb9\u662f\u521b\u5efa\u65b9\u6cd5<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">String fileName = &#8220;example.txt&#8221;;<br>boolean append = true;<br>FileOutputStream fos = new FileOutputStream(fileName, append);<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u4ee5\u4e0a\u4ee3\u7801\u4f7f\u7528\u6587\u4ef6\u540d &#8220;example.txt&#8221; \u548c\u8ffd\u52a0\u6807\u5fd7\u521b\u5efa\u4e00\u4e2a FileOutputStream \u5bf9\u8c61\uff0c\u5c06\u6570\u636e\u8ffd\u52a0\u5230\u8be5\u6587\u4ef6\u7684\u672b\u5c3e\u3002\u5982\u679c\u6587\u4ef6\u4e0d\u5b58\u5728\uff0c\u5219\u521b\u5efa\u4e00\u4e2a\u65b0\u6587\u4ef6\uff1b\u5982\u679c\u6587\u4ef6\u5df2\u7ecf\u5b58\u5728\uff0c\u5219\u5728\u6587\u4ef6\u672b\u5c3e\u8ffd\u52a0\u6570\u636e\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">File file = new File(&#8220;example.txt&#8221;); boolean append = true; <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FileOutputStream fos = new FileOutputStream(file, append);<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">FileInputStream<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u4f9d\u65e7\u5148\u4ecb\u7ecdIputStream\u8f93\u5165\u6d41\u7684\u4e00\u4e9b\u5171\u6027\u64cd\u4f5c<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>close()<\/code>&nbsp;\uff1a\u5173\u95ed\u6b64\u8f93\u5165\u6d41\u5e76\u91ca\u653e\u4e0e\u6b64\u6d41\u76f8\u5173\u7684\u7cfb\u7edf\u8d44\u6e90\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>int read()<\/code>\uff1a \u4ece\u8f93\u5165\u6d41\u8bfb\u53d6\u6570\u636e\u7684\u4e0b\u4e00\u4e2a\u5b57\u8282\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>read(byte[] b)<\/code>\uff1a \u65b9\u6cd5\u4f1a\u4ece\u8f93\u5165\u6d41\u4e2d\u6700\u591a\u8bfb\u53d6 b.length \u4e2a\u5b57\u8282\uff0c\u5e76\u5c06\u5b83\u4eec\u5b58\u50a8\u5230\u7f13\u51b2\u533a\u6570\u7ec4 b \u4e2d\uff0c\u8bfb\u53d6\u4e0d\u5230\u8fd4\u56de-1<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u521b\u5efa\u65b9\u6cd5\u548c\u8f93\u51fa\u6d41\u5dee\u4e0d\u591a\u91cd\u70b9\u4ecb\u7ecdread\u65b9\u6cd5<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><code>read()<\/code>\u65b9\u6cd5\u4f1a\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u5e76\u8fd4\u56de\u5176\u6574\u6570\u8868\u793a\u3002\u5982\u679c\u5df2\u7ecf\u5230\u8fbe\u6587\u4ef6\u7684\u672b\u5c3e\uff0c\u5219\u8fd4\u56de -1\u3002\u5982\u679c\u5728\u8bfb\u53d6\u65f6\u53d1\u751f\u9519\u8bef\uff0c\u5219\u4f1a\u629b\u51fa IOException \u5f02\u5e38<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u521b\u5efa\u4e00\u4e2a FileInputStream \u5bf9\u8c61\nFileInputStream fis = new FileInputStream(\"test.txt\");\n\n\/\/ \u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\nint data;\nwhile ((data = fis.read()) != -1) {\n    System.out.print((char) data);\n}\n\n\/\/ \u5173\u95ed\u8f93\u5165\u6d41\nfis.close();<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u4f7f\u7528\u5b57\u8282\u6570\u7ec4\u8bfb\u53d6<\/strong>\uff1a<code>read(byte[] b)<\/code>&nbsp;\u65b9\u6cd5\u4f1a\u4ece\u8f93\u5165\u6d41\u4e2d\u6700\u591a\u8bfb\u53d6 b.length \u4e2a\u5b57\u8282\uff0c\u5e76\u5c06\u5b83\u4eec\u5b58\u50a8\u5230\u7f13\u51b2\u533a\u6570\u7ec4 b \u4e2d\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/\/ \u521b\u5efa\u4e00\u4e2a FileInputStream \u5bf9\u8c61\nFileInputStream fis = new FileInputStream(\"test.txt\");\n\n\/\/ \u8bfb\u53d6\u6587\u4ef6\u5185\u5bb9\u5230\u7f13\u51b2\u533a\nbyte&#91;] buffer = new byte&#91;1024];\nint count;\nwhile ((count = fis.read(buffer)) != -1) {\n    System.out.println(new String(buffer, 0, count));\n}\n\n\/\/ \u5173\u95ed\u8f93\u5165\u6d41\nfis.close();<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u592a\u4e45\u6574\u7406IO\u6d41\u6211\u6709\u4e9b\u5c0f\u5fd8\u8bb0\u4e86\uff0c\u7a0d\u5fae\u6574\u7406\u4e00\u4e0b\u3002\u5bf9\u6d41\u7684\u64cd\u4f5c\u53ef\u4ee5\u5206\u4e3a\u5bf9\u5b57\u8282\u64cd\u4f5c\u4e5f\u53ef\u4ee5\u5206\u4e3a\u5bf9\u5b57\u7b26\u64cd\u4f5c\uff0c\u5982\u679c\u662f\u5bf9\u5b57\u7b26\u64cd\u4f5c [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":154,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-153","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn"],"_links":{"self":[{"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/posts\/153","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/comments?post=153"}],"version-history":[{"count":2,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/posts\/153\/revisions"}],"predecessor-version":[{"id":234,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/posts\/153\/revisions\/234"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/media\/154"}],"wp:attachment":[{"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/media?parent=153"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/categories?post=153"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lsuccess.xyz\/index.php\/wp-json\/wp\/v2\/tags?post=153"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}