{"id":580,"date":"2015-04-26T19:26:02","date_gmt":"2015-04-26T11:26:02","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=580"},"modified":"2015-04-26T19:30:00","modified_gmt":"2015-04-26T11:30:00","slug":"java%e7%9a%84io%e6%80%a7%e8%83%bd%e8%b0%83%e6%95%b4","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=580","title":{"rendered":"Java\u7684IO\u6027\u80fd\u8c03\u6574"},"content":{"rendered":"<p>\u6458\u8981\uff1a\u672c\u6587\u5927\u591a\u6280\u672f\u56f4\u7ed5\u8c03\u6574\u78c1\u76d8\u6587\u4ef6 I\/O,\u4f46\u662f\u6709\u4e9b\u5185\u5bb9\u4e5f\u540c\u6837\u9002\u5408\u7f51\u7edc I\/O \u548c\u7a97\u53e3\u8f93\u51fa\u3002<\/p>\n<p>\u7b2c\u4e00\u90e8\u5206\u6280\u672f\u8ba8\u8bba\u5e95\u5c42\u7684I\/O\u95ee\u9898\uff0c\u7136\u540e\u8ba8\u8bba\u8bf8\u5982\u538b\u7f29\uff0c\u683c\u5f0f\u5316\u548c\u4e32\u884c\u5316\u7b49\u9ad8\u7ea7I\/O\u95ee\u9898\u3002\u7136\u800c\u8fd9\u4e2a\u8ba8\u8bba\u6ca1\u6709\u5305\u542b\u5e94\u7528\u8bbe\u8ba1\u95ee\u9898\uff0c\u4f8b\u5982\u641c\u7d22\u7b97\u6cd5\u548c\u6570\u636e\u7ed3\u6784\uff0c\u4e5f\u6ca1\u6709\u8ba8\u8bba\u7cfb\u7edf\u7ea7\u7684\u95ee\u9898\uff0c\u4f8b\u5982\u6587\u4ef6\u9ad8\u901f\u7f13\u51b2\u3002<\/p>\n<p><!--more--><\/p>\n<p>Java\u8bed\u8a00\u91c7\u53d6\u4e24\u79cd\u622a\u7136\u4e0d\u540c\u7684\u78c1\u76d8\u6587\u4ef6\u7ed3\u6784\u3002\u4e00\u4e2a\u662f\u57fa\u4e8e\u5b57\u8282\u6d41\uff0c\u53e6\u4e00\u4e2a\u662f\u5b57\u7b26\u5e8f\u5217\u3002\u5728Java\u8bed\u8a00\u4e2d\u4e00\u4e2a\u5b57\u7b26\u6709\u4e24\u4e2a\u5b57\u8282\u8868\u793a\uff0c\u800c\u4e0d\u662f\u50cf\u901a\u5e38\u7684\u8bed\u8a00\u5982c\u8bed\u8a00\u90a3\u6837\u662f\u4e00\u4e2a\u5b57\u8282\u3002\u56e0\u6b64\uff0c\u4ece\u4e00\u4e2a\u6587\u4ef6\u8bfb\u53d6\u5b57\u7b26\u65f6\u9700\u8981\u8fdb\u884c\u8f6c\u6362\u3002\u8fd9\u4e2a\u4e0d\u540c\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u662f\u5f88\u91cd\u8981\u7684\uff0c\u5c31\u50cf\u4e0b\u9762\u7684\u51e0\u4e2a\u4f8b\u5b50\u5c06\u8981\u5c55\u793a\u7684\u90a3\u6837\u3002<\/p>\n<p>\u4f4e\u7ea7I\/O\u76f8\u5173\u7684\u95ee\u9898\uff1a<\/p>\n<ul>\n<li>\u7f13\u51b2<\/li>\n<li>\u8bfb\u5199\u6587\u672c\u6587\u4ef6<\/li>\n<li>\u683c\u5f0f\u5316\u7684\u4ee3\u4ef7<\/li>\n<li>\u968f\u673a\u8bbf\u95ee<\/li>\n<\/ul>\n<p>\u9ad8\u7ea7I\/O\u95ee\u9898<\/p>\n<ul>\n<li>\u538b\u7f29<\/li>\n<li>\u9ad8\u901f\u7f13\u51b2<\/li>\n<li>\u5206\u89e3<\/li>\n<li>\u4e32\u884c\u5316<\/li>\n<li>\u83b7\u53d6\u6587\u4ef6\u4fe1\u606f<\/li>\n<li>\u66f4\u591a\u4fe1\u606f<\/li>\n<\/ul>\n<p>\u52a0\u901fI\/O\u7684\u57fa\u672c\u89c4\u5219<\/p>\n<ul>\n<li>\u907f\u514d\u8bbf\u95ee\u78c1\u76d8<\/li>\n<li>\u907f\u514d\u8bbf\u95ee\u5e95\u5c42\u7684\u64cd\u4f5c\u7cfb\u7edf<\/li>\n<li>\u907f\u514d\u65b9\u6cd5\u8c03\u7528<\/li>\n<li>\u907f\u514d\u4e2a\u522b\u7684\u5904\u7406\u5b57\u8282\u548c\u5b57\u7b26<\/li>\n<\/ul>\n<p>\u5f88\u660e\u663e\u8fd9\u4e9b\u89c4\u5219\u4e0d\u80fd\u5728\u6240\u6709\u7684\u95ee\u9898\u4e0a\u907f\u514d\uff0c\u56e0\u4e3a\u5982\u679c\u80fd\u591f\u7684\u8bdd\u5c31\u6ca1\u6709\u5b9e\u9645\u7684I\/O\u88ab\u6267\u884c\u3002<\/p>\n<p><strong>\u4f7f\u7528\u7f13\u5b58\u51cf\u5c11\u8bfb\u5199\u6b21\u6570\u5f00\u9500<\/strong><\/p>\n<p>\u4f7f\u7528\u7f13\u51b2\u52a0\u901f\u6587\u4ef6\u8bfb\u53d6\u7684\u793a\u4f8b\uff1a<\/p>\n<table border=\"1\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td valign=\"top\" width=\"568\">\u5bf9\u4e8e\u4e00\u4e2a1 MB\u7684\u8f93\u5165\u6587\u4ef6\uff0c\u4ee5\u79d2\u4e3a\u5355\u4f4d\u7684\u6267\u884c\u65f6\u95f4\u662f:<strong>\u00a0<wbr \/>FileInputStream\u7684read\u65b9\u6cd5\uff0c\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\uff0c\u4e0d\u7528\u7f13\u51b2 \u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>6.9\u79d2<\/strong><\/p>\n<p><strong>\u00a0<wbr \/>BufferedInputStream\u7684read\u65b9\u6cd5\u4f7f\u7528BufferedInputStream\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> \u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>0.9\u79d2<\/strong><\/p>\n<p><strong>\u00a0<wbr \/>FileInputStream\u7684read\u65b9\u6cd5\u8bfb\u53d6\u6570\u636e\u5230\u76f4\u63a5\u7f13\u51b2\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> \u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>0.4\u79d2<\/strong><\/p>\n<p>\u6216\u8005\u8bf4\u5728\u6700\u6162\u7684\u65b9\u6cd5\u548c\u6700\u5feb\u7684\u65b9\u6cd5\u95f4\u662f17\u6bd41\u7684\u4e0d\u540c\u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8fd9\u4e2a\u5de8\u5927\u7684\u52a0\u901f\u5e76\u4e0d\u80fd\u8bc1\u660e\u4f60\u5e94\u8be5\u603b\u662f\u4f7f\u7528\u7b2c\u4e09\u79cd\u65b9\u6cd5\uff0c\u5373\u81ea\u5df1\u505a\u7f13\u51b2\u3002\u8fd9\u53ef\u80fd\u662f\u4e00\u4e2a\u9519\u8bef\u7684\u503e\u5411\u7279\u522b\u662f\u5728\u5904\u7406\u6587\u4ef6\u7ed3\u675f\u4e8b\u4ef6\u65f6\u6ca1\u6709\u4ed4\u7ec6\u7684\u5b9e\u73b0\u3002\u5728\u53ef\u8bfb\u6027\u4e0a\u5b83\u4e5f\u6ca1\u6709\u5176\u5b83\u65b9\u6cd5\u597d\u3002\u4f46\u662f\u8bb0\u4f4f\u65f6\u95f4\u82b1\u8d39\u5728\u54ea\u513f\u4e86\u4ee5\u53ca\u5728\u5fc5\u8981\u7684\u65f6\u5019\u5982\u4f55\u77eb\u6b63\u662f\u5f88\u6709\u7528\u3002\u65b9\u6cd52 \u6216\u8bb8\u662f\u5bf9\u4e8e\u5927\u591a\u5e94\u7528\u7684 &#8220;\u6b63\u786e&#8221; \u65b9\u6cd5.<\/p>\n<p>\u65b9\u6cd5 2 \u548c 3 \u4f7f\u7528\u4e86\u7f13\u51b2\u6280\u672f, \u5927\u5757\u6587\u4ef6\u88ab\u4ece\u78c1\u76d8\u8bfb\u53d6\uff0c\u7136\u540e\u6bcf\u6b21\u8bbf\u95ee\u4e00\u4e2a\u5b57\u8282\u6216\u5b57\u7b26\u3002\u7f13\u51b2\u662f\u4e00\u4e2a\u57fa\u672c\u800c\u91cd\u8981\u7684\u52a0\u901fI\/O \u7684\u6280\u672f,\u800c\u4e14\u6709\u51e0\u4e2a\u7c7b\u652f\u6301\u7f13\u51b2(BufferedInputStream \u7528\u4e8e\u5b57\u8282, BufferedReader \u7528\u4e8e\u5b57\u7b26)\u3002<\/p>\n<p>\u7f13\u51b2\u533a\u8d8a\u5927I\/O\u8d8a\u5feb\u5417\uff1f\u5178\u578b\u7684Java\u7f13\u51b2\u533a\u957f1024 \u6216\u8005 2048 \u5b57\u8282\uff0c\u4e00\u4e2a\u66f4\u5927\u7684\u7f13\u51b2\u533a\u6709\u53ef\u80fd\u52a0\u901f I\/O\u4f46\u6bd4\u91cd\u5f88\u5c0f\uff0c\u5927\u7ea65 \u523010%\u3002<\/p>\n<p>\u65b9\u6cd51: \u8bfb\u65b9\u6cd5<\/p>\n<p>\u7b2c\u4e00\u4e2a\u65b9\u6cd5\u7b80\u5355\u7684\u4f7f\u7528FileInputStream\u7684read\u65b9\u6cd5:<\/p>\n<table border=\"1\" width=\"595\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td valign=\"top\" width=\"595\">FileInputStream\u7684read\u65b9\u6cd5\u6bcf\u6b21\u8bfb\u53d6\u6587\u4ef6\u7684\u4e0b\u4e00\u4e2a\u5b57\u8282\uff0c\u89e6\u53d1\u4e86\u5927\u91cf\u7684\u5e95\u5c42\u8fd0\u884c\u65f6\u7cfb\u7edf\u8c03\u7528\u4f18\u70b9\uff1a\u7f16\u7801\u7b80\u5355\uff0c\u9002\u7528\u4e8e\u5c0f\u6587\u4ef6<\/p>\n<p>\u7f3a\u70b9\uff1a\u8bfb\u5199\u9891\u7e41\uff0c\u4e0d\u9002\u7528\u4e8e\u5927\u6587\u4ef6<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"595\">\u00a0<wbr \/>import java.io.*;<wbr \/> public class intro1 {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> public static void main(String args[]) {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> if (args.length != 1) {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> System.err.println(&#8220;missing filename&#8221;);<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> \u00a0<wbr \/>\u00a0<wbr \/>System.exit(1);<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> try {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> <b>FileInputStream fis = new FileInputStream(args[0]); \/\/<\/b><b>\u5efa\u7acb\u6307\u5411\u6587\u4ef6\u7684\u8bfb\u5199\u6d41<\/b><\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> int cnt = 0;<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> int b;<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> while ((<b>b = fis.read()) != -1<\/b>) {\u00a0<wbr \/> \/\/ <b>FileInputStream<\/b><b>\u7684read\u65b9\u6cd5\u6bcf\u6b21<\/b>\u8bfb\u53d6\u6587\u4ef6\u4e00\u4e2a\u5b57\u8282<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> if (b == &#8216;\\n&#8217;)<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> \u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>cnt++;<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> fis.close();<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> System.out.println(cnt);<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> catch (IOException e) {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> System.err.println(e);<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/> }<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u65b9\u6cd5 2: \u4f7f\u7528\u5927\u7f13\u51b2\u533a<\/p>\n<p>\u7b2c\u4e8c\u79cd\u65b9\u6cd5\u4f7f\u7528\u5927\u7f13\u51b2\u533a\u907f\u514d\u4e86\u4e0a\u9762\u7684\u95ee\u9898:<\/p>\n<table border=\"1\" width=\"733\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td valign=\"top\" width=\"733\">BufferedInputStream\u7684read\u65b9\u6cd5\u628a\u6587\u4ef6\u7684\u5b57\u8282\u5757\u8bfb\u5165\u7f13\u51b2\u533a\uff0c\u7136\u540e\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\uff0c\u6bcf\u6b21\u586b\u5145\u7f13\u51b2\u53ea\u9700\u8981\u8bbf\u95ee\u4e00\u6b21\u5e95\u5c42\u5b58\u50a8\u63a5\u53e3\u4f18\u70b9\uff1a\u907f\u514d\u6bcf\u4e2a\u5b57\u8282\u7684\u5e95\u5c42\u8bfb\u53d6\uff0c\u7f16\u7801\u76f8\u5bf9\u4e0d\u590d\u6742<\/p>\n<p>\u7f3a\u70b9\uff1a\u7f13\u5b58\u5360\u7528\u4e86\u5c0f\u91cf\u5185\u5b58<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"733\">import java.io.*;<wbr \/>public class intro2 {<\/p>\n<p><wbr \/>\u00a0<wbr \/> public static void main(String args[]) {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> if (args.length != 1) {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> System.err.println(&#8220;missing filename&#8221;);<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> System.exit(1);<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> try {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> FileInputStream fis =\u00a0<wbr \/> new FileInputStream(args[0]);<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> <b>BufferedInputStream bis = new BufferedInputStream(fis); \/\/<\/b><b>\u628a\u6587\u4ef6\u8bfb\u53d6\u6d41\u6307\u5411\u7f13\u51b2\u533a<\/b><\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> int cnt = 0;<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> int b;<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> while (<b>(b = bis.read()) != -1<\/b>) { <b>\u00a0<wbr \/>\u00a0<wbr \/>\/\/BufferedInputStream<\/b><b>\u7684read\u65b9\u6cd5\u628a\u6587\u4ef6\u7684\u5b57\u8282\u5757\u72ec\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/><\/b><\/p>\n<p><b>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> \u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\/\/\u5165\u7f13\u51b2\u533aBufferedInputStream\uff0c\u7136\u540e\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282<\/b><\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> if (b == &#8216;\\n&#8217;)<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> cnt++;<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> bis.close();<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> System.out.println(cnt);<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> catch (IOException e) {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> System.err.println(e);<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/> }<\/p>\n<p><wbr \/>}<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u65b9\u6cd5 3: \u76f4\u63a5\u7f13\u51b2<\/p>\n<table border=\"1\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td valign=\"top\" width=\"568\">FileInputStream\u7684read\u65b9\u6cd5\u76f4\u63a5\u8bfb\u5165\u5b57\u8282\u5757\u5230\u76f4\u63a5\u7f13\u51b2buf\uff0c\u7136\u540e\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u3002\u4f18\u70b9\uff1a\u901f\u5ea6\u6700\u5feb\uff0c<\/p>\n<p>\u7f3a\u70b9\uff1a\u7f16\u7801\u7a0d\u5fae\u590d\u6742\uff0c\u53ef\u8bfb\u6027\u5dee\uff0c\u5360\u7528\u4e86\u5c0f\u91cf\u5185\u5b58\uff0c<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"568\">import java.io.*;<wbr \/> public class intro3 {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> public static void main(String args[]) {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> if (args.length != 1) {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> System.err.println(&#8220;missing filename&#8221;);<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> \u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>System.exit(1);<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> try {<\/p>\n<p><b>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> FileInputStream fis = new FileInputStream(args[0]);<\/b><\/p>\n<p><b>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> byte buf[] = new byte[2048];<\/b><\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> int cnt = 0;<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> int n;<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> while ((<b>n = fis.read(buf)) != -1<\/b>) { \/\/ <b>FileInputStream<\/b><b>\u7684read\u65b9\u6cd5\u76f4\u63a5\u8bfb\u5165\u5b57\u8282\u5757\u5230<\/b><\/p>\n<p><b>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> \u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\/\/\u76f4\u63a5\u7f13\u51b2buf\uff0c\u7136\u540e\u6bcf\u6b21\u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282<\/b><\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> for (int i = 0; i &lt; n; i++) {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> if (buf[i] == &#8216;\\n&#8217;)<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> cnt++;<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> fis.close();<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> System.out.println(cnt);<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> catch (IOException e) {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> System.err.println(e);<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/> }<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u65b9\u6cd54: \u7f13\u51b2\u6574\u4e2a\u6587\u4ef6<\/p>\n<table border=\"1\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td valign=\"top\" width=\"733\">\u7f13\u51b2\u7684\u6781\u7aef\u60c5\u51b5\u662f\u4e8b\u5148\u51b3\u5b9a\u6574\u4e2a\u6587\u4ef6\u7684\u957f\u5ea6\uff0c\u7136\u540e\u8bfb\u53d6\u6574\u4e2a\u6587\u4ef6\u3002\u4f18\u70b9\uff1a\u628a\u6587\u4ef6\u5e95\u5c42\u8bfb\u53d6\u964d\u5230\u6700\u5c11\uff0c\u4e00\u6b21\uff0c<\/p>\n<p>\u7f3a\u70b9\uff1a\u5927\u6587\u4ef6\u4f1a\u8017\u5c3d\u5185\u5b58\u3002<\/td>\n<\/tr>\n<tr>\n<td valign=\"top\" width=\"733\">import java.io.*;<wbr \/> public class readfile {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> public static void main(String args[]) {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> if (args.length != 1) {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> \u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>System.err.println(&#8220;missing filename&#8221;);<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> System.exit(1);<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> try {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> int len = (int)(new File(args[0]).length());<\/p>\n<p><b>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> FileInputStream fis = new FileInputStream(args[0]);<\/b><\/p>\n<p><b>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> byte buf[] = new byte[len];\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> \/\/\u5efa\u7acb\u76f4\u63a5\u7f13\u51b2<\/b><\/p>\n<p><b>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> fis.read(buf);\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> \/\/ \u8bfb\u53d6\u6574\u4e2a\u6587\u4ef6<\/b><\/p>\n<p><b>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> fis.close();<\/b><\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> int cnt = 0;<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> for (int i = 0; i &lt; len; i++) {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> if (buf[i] == &#8216;\\n&#8217;)<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> cnt++;<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> System.out.println(cnt);<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> catch (IOException e) {<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> System.err.println(e);<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/>\u00a0<wbr \/>\u00a0<wbr \/> }<\/p>\n<p><wbr \/> }<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u8fd9\u4e2a\u65b9\u6cd5\u5f88\u65b9\u4fbf\uff0c\u5728\u8fd9\u91cc\u6587\u4ef6\u88ab\u5f53\u4f5c\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u3002\u4f46\u662f\u6709\u4e00\u4e2a\u660e\u663e\u5f97\u95ee\u9898\u662f\u6709\u53ef\u80fd\u6ca1\u6709\u8bfb\u53d6\u4e00\u4e2a\u5de8\u5927\u7684\u6587\u4ef6\u7684\u8db3\u591f\u7684\u5185\u5b58\u3002<\/p>\n<p>\u7f13\u51b2\u7684\u53e6\u4e00\u4e2a\u65b9\u9762\u662f\u5411\u7a97\u53e3\u7ec8\u7aef\u7684\u6587\u672c\u8f93\u51fa\u3002\u7f3a\u7701\u60c5\u51b5\u4e0b\uff0c System.out ( \u4e00\u4e2aPrintStream) \u662f\u884c\u7f13\u51b2\u7684\uff0c\u8fd9\u610f\u5473\u7740\u5728\u9047\u5230\u4e00\u4e2a\u65b0\u884c\u7b26\u540e\u8f93\u51fa\u7f13\u51b2\u533a\u88ab\u63d0\u4ea4\u3002<\/p>\n<p><a href=\"http:\/\/blog.csdn.net\/yihu0817\/article\/details\/41965589\">http:\/\/www.uml.org.cn\/zjjs\/201006121.asp<\/a>\u00a0<wbr \/>\u8f6c\u8d34<a href=\"http:\/\/blog.csdn.net\/Dbzen\/archive\/2008\/11\/22\/3350325.aspx\">http:\/\/blog.csdn.net\/Dbzen\/archive\/2008\/11\/22\/3350325.aspx<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6458\u8981\uff1a\u672c\u6587\u5927\u591a\u6280\u672f\u56f4\u7ed5\u8c03\u6574\u78c1\u76d8\u6587\u4ef6 I\/O,\u4f46\u662f\u6709\u4e9b\u5185\u5bb9\u4e5f\u540c\u6837\u9002\u5408\u7f51\u7edc I\/O \u548c\u7a97\u53e3\u8f93\u51fa\u3002 \u7b2c\u4e00\u90e8\u5206\u6280\u672f\u8ba8\u8bba [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[22],"tags":[],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/580"}],"collection":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=580"}],"version-history":[{"count":4,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/580\/revisions"}],"predecessor-version":[{"id":584,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/580\/revisions\/584"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=580"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=580"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=580"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}