{"id":143,"date":"2015-04-03T15:05:33","date_gmt":"2015-04-03T07:05:33","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=143"},"modified":"2016-10-11T15:49:10","modified_gmt":"2016-10-11T07:49:10","slug":"java%e8%be%93%e5%85%a5%e8%be%93%e5%87%baio%e6%b5%81%e6%80%bb%e7%bb%93","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=143","title":{"rendered":"Java\u8f93\u5165\u8f93\u51fa(IO)\u6d41\u603b\u7ed3"},"content":{"rendered":"<h2>\u4e00\u3001IO\u6d41\u7684\u4e09\u79cd\u5206\u7c7b\u65b9\u5f0f<\/h2>\n<p>[java]1.\u6309\u6d41\u7684\u65b9\u5411\u5206\u4e3a\uff1a\u8f93\u5165\u6d41\u548c\u8f93\u51fa\u6d41<br \/>\n2.\u6309\u6d41\u7684\u6570\u636e\u5355\u4f4d\u4e0d\u540c\u5206\u4e3a\uff1a\u5b57\u8282\u6d41\u548c\u5b57\u7b26\u6d41<br \/>\n3.\u6309\u6d41\u7684\u529f\u80fd\u4e0d\u540c\u5206\u4e3a\uff1a\u8282\u70b9\u6d41\u548c\u5904\u7406\u6d41[\/java]<br \/>\n<!--more--><\/p>\n<h2>\u4e8c\u3001IO\u6d41\u7684\u56db\u5927\u62bd\u8c61\u7c7b\uff1a<\/h2>\n<p>[java]\u5b57\u7b26\u6d41\uff1aReader     Writer<br \/>\n\u5b57\u8282\u6d41\uff1aInputStream\uff08\u8bfb\u6570\u636e\uff09 OutputStream\uff08\u5199\u6570\u636e\uff09[\/java]<\/p>\n<h2>\u4e09\u3001InputStream\u7684\u57fa\u672c\u65b9\u6cd5<\/h2>\n<p>[java]int read\uff08\uff09 throws IOException \u8bfb\u53d6\u4e00\u4e2a\u5b57\u8282\u4ee5\u6574\u6570\u5f62\u5f0f\u8fd4\u56de\uff0c\u5982\u679c\u8fd4\u56de-1\u5df2\u5230\u8f93\u5165\u6d41\u7684\u672b\u5c3e<br \/>\nvoid close\uff08\uff09 throws IOException \u5173\u95ed\u6d41\u91ca\u653e\u5185\u5b58\u8d44\u6e90<br \/>\nlong skip\uff08long n\uff09 throws IOException \u8df3\u8fc7n\u4e2a\u5b57\u8282\u4e0d\u8bfb[\/java]<\/p>\n<h2>\u56db\u3001OutputStream\u7684\u57fa\u672c\u65b9\u6cd5<\/h2>\n<p>[java]void write\uff08int b\uff09 throws IOException \u5411\u8f93\u51fa\u6d41\u5199\u5165\u4e00\u4e2a\u5b57\u8282\u6570\u636e<br \/>\nvoid flush\uff08\uff09 throws IOException \u5c06\u8f93\u51fa\u6d41\u4e2d\u7f13\u51b2\u7684\u6570\u636e\u5168\u90e8\u5199\u51fa\u5230\u76ee\u7684\u5730[\/java]<\/p>\n<h2>\u4e94\u3001Writer\u7684\u57fa\u672c\u65b9\u6cd5<\/h2>\n<p>[java]void write\uff08int c\uff09 throws IOException \u5411\u8f93\u51fa\u6d41\u5199\u5165\u4e00\u4e2a\u5b57\u7b26\u6570\u636e<br \/>\nvoid write\uff08String str\uff09 throws IOException\u5c06\u4e00\u4e2a\u5b57\u7b26\u4e32\u4e2d\u7684\u5b57\u7b26\u5199\u5165\u5230\u8f93\u51fa\u6d41<br \/>\nvoid write\uff08String str\uff0cint offset\uff0cint length\uff09<br \/>\n\u5c06\u4e00\u4e2a\u5b57\u7b26\u4e32\u4eceoffset\u5f00\u59cb\u7684length\u4e2a\u5b57\u7b26\u5199\u5165\u5230\u8f93\u51fa\u6d41<br \/>\nvoid flush\uff08\uff09 throws IOException \u5c06\u8f93\u51fa\u6d41\u4e2d\u7f13\u51b2\u7684\u6570\u636e\u5168\u90e8\u5199\u51fa\u5230\u76ee\u7684\u5730[\/java]<\/p>\n<h2>\u516d\u3001Reader\u7684\u57fa\u672c\u65b9\u6cd5<\/h2>\n<p>[java]int read\uff08\uff09 throws IOException \u8bfb\u53d6\u4e00\u4e2a\u5b57\u7b26\u4ee5\u6574\u6570\u5f62\u5f0f\u8fd4\u56de\uff0c\u5982\u679c\u8fd4\u56de-1\u5df2\u5230\u8f93\u5165\u6d41\u7684\u672b\u5c3e[\/java]<\/p>\n<h2>\u4e03\u3001\u8282\u70b9\u6d41\u7c7b\u578b<\/h2>\n<p>[java]\u516b\u3001\u8bbf\u95ee\u6587\u4ef6\u4e4bFileInputStream\u548cFileOutputStream\u7ee7\u627f\u57fa\u7c7b\u7528\u4e8e\u5411\u6587\u4ef6\u4e2d\u8f93\u5165\u8f93\u51fa\u5b57\u8282<br \/>\n\u4e5d\u3001\u8bbf\u95ee\u6587\u4ef6\u4e4bFileReader\u548cFileWriter\u7ee7\u627f\u57fa\u7c7b\u7528\u4e8e\u5411\u6587\u4ef6\u4e2d\u8f93\u5165\u8f93\u51fa\u5b57\u7b26[\/java]<\/p>\n<p>&#8212;-\u8f93\u51fa\u6d41\u5728\u6784\u9020\u51fd\u6570\u7b2c\u4e8c\u4e2a\u53c2\u6570\u53ef\u4ee5\u8bbe\u7f6etrue\u610f\u4e49\u4e3a\u8ddf\u5728\u5df2\u6709\u6587\u4ef6\u540e\u8fdb\u884c\u8f93\u5165&#8212;-\u6b64\u7c7b\u6d41\u4f1a\u629b\u51faFileNotFoundException\u9700\u8981\u5bf9\u5176\u8fdb\u884c\u663e\u793a\u6355\u6349<\/p>\n<h2>\u5341\u3001\u7f13\u51b2\u6d41\uff1a<\/h2>\n<p>\u7f13\u51b2\u6d41\u8981\u5957\u63a5\u5728\u76f8\u5e94\u7684\u8282\u70b9\u6d41\u4e4b\u4e0a\uff0c\u63d0\u9ad8\u4e86\u8bfb\u5199\u7684\u6548\u7387\u3002<br \/>\n\u6b64\u5904\u7406\u6d41\u7684\u6784\u9020\u65b9\u6cd5\u90fd\u5f97\u4f20\u76f8\u5bf9\u5e94\u7684\u57fa\u7c7b\u7c7b\u578b<br \/>\n[java]BufferedReader\uff1a\u63d0\u4f9b\u4e86readLine\u65b9\u6cd5\u7528\u4e8e\u9ad8\u6821\u8bfb\u53d6\u4e00\u884c\u5b57\u7b26\u4e32<br \/>\nBufferedWriter\uff1a\u63d0\u4f9b\u4e86newLine\u7528\u4e8e\u5199\u5165\u4e00\u4e2a\u884c\u5206\u9694\u7b26\u4e5f\u5c31\u662f\u6362\u884c<br \/>\nBufferedInputStream \u6ca1\u591a\u5927\u7528\u5904<br \/>\nBufferedOutputStream \u6ca1\u591a\u5927\u7528\u5904[\/java]<\/p>\n<h2>\u5341\u4e00\u3001\u8f6c\u6362\u6d41\uff1a<\/h2>\n<p>\u4e3b\u8981\u4f5c\u7528\u5c06\u5b57\u8282\u6d41\u8f6c\u6362\u6210\u5b57\u7b26\u6d41\u3002\u7528\u5904\u8f83\u5927\uff01<br \/>\n\u8f6c\u6362\u6d41\u5728\u6784\u9020\u65f6\u53ef\u4ee5\u6307\u5b9a\u5176\u7f16\u7801\u96c6\u5408<br \/>\n[java]InputStreamReader\u9700\u8981\u548cInputStream\u5957\u63a5<br \/>\nOutputStreamWriter\u9700\u8981\u548cOutputStream\u5957\u63a5<br \/>\n\u4f8b\uff1aOutputStreamWriter osw = new OutputStreamWriter \uff08new FileOutputStream\uff08\u6587\u4ef6\u8def\u5f84\uff09\uff1b<br \/>\n\u65b9\u6cd5\u4f8b\uff1aosw.getEncoding\uff08\uff09\uff1b \u83b7\u5f97\u6d41\u7684\u7f16\u7801\u65b9\u5f0f[\/java]<\/p>\n<h2>\u5341\u4e8c\u3001\u6570\u636e\u6d41\u4e0e\u5b57\u8282\u6570\u7ec4\u6d41\uff1a<\/h2>\n<p>\u6570\u636e\u6d41\u4e3b\u8981\u4e3a\u5b9e\u73b0\u53ef\u4ee5\u5b58\u53d6Java\u539f\u59cb\u6570\u636e\u7c7b\u578b\u5982long\uff0cboolean<br \/>\n\u6570\u636e\u6d41\u662f\u5b57\u8282\u6d41<br \/>\n[java]DataInputStream\u9700\u8981\u548cInputStream\u5957\u63a5<br \/>\nDataOutputStream\u9700\u8981\u548cOutputStream\u5957\u63a5<\/p>\n<p>DataInputStream\u65b9\u6cd5\uff1a<br \/>\nreadBoolean\uff08\uff09<br \/>\nreadInt\uff08\uff09<br \/>\nread\u2026\u2026\uff08\uff09\u2026\u2026<br \/>\nreadUTF\uff08\uff09\uff1a\u7f51\u7edc\u4f20\u8f93\u5e38\u7528\u65b9\u6cd5 \u8bfb\u4e00\u4e2aUnicode\u5b57\u7b26\u4e32<\/p>\n<p>DataOutputStream\u65b9\u6cd5\u4e0eDataInputStream\u57fa\u672c\u5bf9\u5e94\u4e3a\u5199\u7684\u65b9\u6cd5<br \/>\n\/\/\u6b64\u6784\u9020\u51fd\u6570\u7b49\u4e8e\u5df2\u53ef\u4ee5\u5f80\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u91cc\u8f93\u5165\u5185\u5bb9<br \/>\nByteArrayOutputStream baos = new ByteArrayOutputStream \uff08\uff09\uff1b<br \/>\n\/\/\u6b64\u65b9\u6cd5\u4e3a\u83b7\u53d6\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\u65b9\u6cd5\u8fd4\u56de\u5b57\u8282\u6570\u7ec4<br \/>\nbaos.toByteArray\uff08\uff09\uff1b<br \/>\n\/\/\u6b64\u65b9\u6cd5\u83b7\u53d6\u5b57\u8282\u6570\u7ec4\u5360\u4e86\u591a\u5c11\u5b57\u8282<br \/>\nnew ByteArrayInputStream\uff08\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\uff09\u3002<br \/>\navailable\uff08\uff09[\/java]<\/p>\n<p>[java] ByteArrayOutputStream baos = new ByteArrayOutputStream();<br \/>\n\u00a0\u00a0\u00a0 DataOutputStream dos = new DataOutputStream(baos);<br \/>\n\u00a0\u00a0\u00a0 try {<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0 dos.writeDouble(Math.random());<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0 dos.writeBoolean(true);<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0 ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(bais.available());<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0 DataInputStream dis = new DataInputStream(bais);<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(dis.readDouble());<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(dis.readBoolean());<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0 dos.close();\u00a0<br \/>\n      dis.close();<br \/>\n\u00a0\u00a0\u00a0 } catch (IOException e) {<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0 e.printStackTrace();<br \/>\n\u00a0\u00a0\u00a0 }[\/java]<\/p>\n<h2>\u5341\u4e09\u3001Print\u6d41<\/h2>\n<p>Print\u6d41\u53ea\u6709\u8f93\u51fa\u6d41\u65e0\u8f93\u5165\u6d41\uff0cPrintWriter\u548cPrintStream\u5206\u522b\u9488\u5bf9\u5b57\u7b26\u5b57\u8282<br \/>\n\u4e24\u4e2a\u7c7b\u63d0\u4f9b\u4e86\u91cd\u8f7d\u7684Print\u548cPrintln\u65b9\u6cd5\u7528\u4e8e\u591a\u79cd\u6570\u636e\u7c7b\u578b\u7684\u8f93\u51fa<br \/>\n[java]PrintWriter\u548cPrintStream\u7684\u8f93\u51fa\u64cd\u4f5c\u4e0d\u4f1a\u629b\u51fa\u5f02\u5e38<br \/>\nPrintWriter\u548cPrintStream\u6709\u81ea\u52a8flush\u529f\u80fd<br \/>\n&#8212;-System.setOut(\u63a5\u6536OutputStream\u7c7b):\u7528\u4e8e\u8bbe\u7f6e\u7cfb\u7edf\u9ed8\u8ba4\u8f93\u51fa\u6d41[\/java]<\/p>\n<h2>\u5341\u56db\u3001Object\u6d41<\/h2>\n<p>\u7b49\u540c\u4e8ec#\u5e8f\u5217\u5316\uff0c\u7528\u76f4\u63a5\u5c06Object\u5199\u5165\u6216\u8bfb\u51fa<br \/>\ntransient\u5173\u952e\u5b57\u4e3a\u4e0d\u5e8f\u5217\u5316\u6b64\u6210\u5458\u53d8\u91cf<br \/>\n\u9700\u8981\u5e8f\u5217\u5316\u7684\u7c7b\u5fc5\u987b\u5b9e\u73b0Serializable\u63a5\u53e3<br \/>\n\u4e3b\u8981\u65b9\u6cd5\uff1awriteObject\uff08Object\uff09\uff1b readObject\uff08\uff09\uff1b<br \/>\n\u8bfb\u51fa\u4e3aObject\u7c7b\u578b\u9700\u8981\u5f3a\u8f6c\u6570\u636e\u7c7b\u578b<\/p>\n<p>[java]import java.io.*;<\/p>\n<p> public class TestObjectIO {<br \/>\n\u00a0\u00a0\u00a0\u00a0 public static void main(String args[]) throws Exception {<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 T t = new T();<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 t.k = 8;<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 FileOutputStream fos = new FileOutputStream(&quot;d:\/share\/java\/io\/testobjectio.dat&quot;);<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ObjectOutputStream oos = new ObjectOutputStream(fos);<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 oos.writeObject(t);<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0oos.flush();<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0oos.close();<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 FileInputStream fis = new FileInputStream(&quot;d:\/share\/java\/io\/testobjectio.dat&quot;);<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ObjectInputStream ois = new ObjectInputStream(fis);<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 T tReaded = (T)ois.readObject();<br \/>\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 System.out.println(tReaded.i + &quot; &quot; + tReaded.j + &quot; &quot; + tReaded.d + &quot; &quot; + tReaded.k);<\/p>\n<p>\u00a0\u00a0\u00a0\u00a0 }<br \/>\n }<\/p>\n<p> class T  implements Serializable<br \/>\n {<br \/>\n\u00a0\u00a0\u00a0\u00a0 int i = 10;<br \/>\n\u00a0\u00a0\u00a0\u00a0 int j = 9;<br \/>\n\u00a0\u00a0\u00a0\u00a0 double d = 2.3;<br \/>\n\u00a0\u00a0\u00a0\u00a0 transient int k = 15;<br \/>\n }[\/java]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001IO\u6d41\u7684\u4e09\u79cd\u5206\u7c7b\u65b9\u5f0f [java]1.\u6309\u6d41\u7684\u65b9\u5411\u5206\u4e3a\uff1a\u8f93\u5165\u6d41\u548c\u8f93\u51fa\u6d41 2.\u6309\u6d41\u7684\u6570\u636e\u5355\u4f4d\u4e0d\u540c\u5206\u4e3a\uff1a\u5b57\u8282\u6d41\u548c [&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":[41],"_links":{"self":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/143"}],"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=143"}],"version-history":[{"count":9,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/143\/revisions"}],"predecessor-version":[{"id":319,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=\/wp\/v2\/posts\/143\/revisions\/319"}],"wp:attachment":[{"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=143"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=143"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ai.zhousir.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=143"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}