{"id":143,"date":"2015-04-03T15:05:33","date_gmt":"2015-04-03T07:05:33","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=143"},"modified":"2026-08-18T12:09:27","modified_gmt":"2026-08-18T04:09:27","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":"
\n

Java \u7684 IO \u53ef\u4ee5\u6309\u4e09\u4e2a\u8f74\u6765\u8bb0\uff1a\u65b9\u5411\uff08\u8f93\u5165 \/ \u8f93\u51fa\uff09\u3001\u6570\u636e\u5355\u4f4d\uff08\u5b57\u8282 \/ \u5b57\u7b26\uff09\u3001\u529f\u80fd\uff08\u8282\u70b9\u6d41 \/ \u5904\u7406\u6d41\uff09\u3002\u56db\u4e2a\u62bd\u8c61\u57fa\u7c7b\u662f InputStream<\/code>\u3001OutputStream<\/code>\u3001Reader<\/code>\u3001Writer<\/code>\u3002<\/p>\n

<\/p>\n\n\n\n\n\n\n\n
\u5206\u7c7b\u8f74<\/th>\n\u4e00\u7c7b<\/th>\n\u53e6\u4e00\u7c7b<\/th>\n<\/tr>\n<\/thead>\n
\u65b9\u5411<\/td>\n\u8f93\u5165\u6d41<\/td>\n\u8f93\u51fa\u6d41<\/td>\n<\/tr>\n
\u6570\u636e\u5355\u4f4d<\/td>\n\u5b57\u8282\u6d41 InputStream \/ OutputStream<\/td>\n\u5b57\u7b26\u6d41 Reader \/ Writer<\/td>\n<\/tr>\n
\u529f\u80fd<\/td>\n\u8282\u70b9\u6d41\uff08\u76f4\u63a5\u8fde\u6587\u4ef6\u7b49\uff09<\/td>\n\u5904\u7406\u6d41\uff08\u5957\u5728\u8282\u70b9\u6d41\u4e0a\uff09<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u4e00\u3001\u56db\u4e2a\u57fa\u7c7b\u7684\u57fa\u672c\u65b9\u6cd5<\/h2>\n

InputStream<\/strong>\uff1aint read()<\/code> \u8bfb\u4e00\u4e2a\u5b57\u8282\uff0c\u8fd4\u56de -1 \u8868\u793a\u5230\u672b\u5c3e\uff1bvoid close()<\/code> \u5173\u95ed\u5e76\u91ca\u653e\u8d44\u6e90\uff1blong skip(long n)<\/code> \u8df3\u8fc7 n \u4e2a\u5b57\u8282\u3002\u90fd\u53ef\u80fd\u629b IOException<\/code>\u3002<\/p>\n

OutputStream<\/strong>\uff1avoid write(int b)<\/code> \u5199\u4e00\u4e2a\u5b57\u8282\uff1bvoid flush()<\/code> \u628a\u7f13\u51b2\u533a\u6570\u636e\u5237\u5230\u76ee\u7684\u5730\u3002<\/p>\n

Writer<\/strong>\uff1awrite(int c)<\/code>\u3001write(String str)<\/code>\u3001write(String str, int offset, int length)<\/code>\uff0c\u4ee5\u53ca flush()<\/code>\u3002<\/p>\n

Reader<\/strong>\uff1aint read()<\/code> \u8bfb\u4e00\u4e2a\u5b57\u7b26\uff0c-1 \u8868\u793a\u5230\u672b\u5c3e\u3002<\/p>\n

\u4e8c\u3001\u8282\u70b9\u6d41\u4e0e\u7f13\u51b2\u6d41<\/h2>\n

\u8bbf\u95ee\u6587\u4ef6\uff1aFileInputStream<\/code> \/ FileOutputStream<\/code> \u6309\u5b57\u8282\u8bfb\u5199\u6587\u4ef6\uff1bFileReader<\/code> \/ FileWriter<\/code> \u6309\u5b57\u7b26\u8bfb\u5199\u3002\u8f93\u51fa\u6d41\u6784\u9020\u51fd\u6570\u7b2c\u4e8c\u4e2a\u53c2\u6570\u4e3a true<\/code> \u65f6\u8868\u793a\u8ffd\u52a0<\/strong>\u5230\u5df2\u6709\u6587\u4ef6\u540e\u9762\u3002\u6253\u5f00\u6587\u4ef6\u53ef\u80fd\u629b FileNotFoundException<\/code>\uff0c\u9700\u8981\u663e\u5f0f\u6355\u6349\u3002<\/p>\n

\u7f13\u51b2\u6d41\u8981\u5957\u5728\u76f8\u5e94\u8282\u70b9\u6d41\u4e0a\uff0c\u63d0\u9ad8\u8bfb\u5199\u6548\u7387\u3002\u6784\u9020\u65b9\u6cd5\u90fd\u8981\u4f20\u5165\u5bf9\u5e94\u7684\u57fa\u7c7b\u7c7b\u578b\u3002BufferedReader<\/code> \u63d0\u4f9b readLine()<\/code> \u9ad8\u6548\u8bfb\u4e00\u884c\uff1bBufferedWriter<\/code> \u63d0\u4f9b newLine()<\/code> \u5199\u5165\u884c\u5206\u9694\u7b26\u3002<\/p>\n

\u4e09\u3001\u8f6c\u6362\u6d41<\/h2>\n

\u8f6c\u6362\u6d41\u628a\u5b57\u8282\u6d41\u8f6c\u6210\u5b57\u7b26\u6d41\uff0c\u6784\u9020\u65f6\u53ef\u4ee5\u6307\u5b9a\u7f16\u7801\u3002InputStreamReader<\/code> \u5957\u5728 InputStream \u4e0a\uff1bOutputStreamWriter<\/code> \u5957\u5728 OutputStream \u4e0a\u3002getEncoding()<\/code> \u53ef\u4ee5\u53d6\u5f97\u5f53\u524d\u7f16\u7801\u3002<\/p>\n

OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream(\u6587\u4ef6\u8def\u5f84));\nString enc = osw.getEncoding();<\/code><\/pre>\n
\u56db\u3001\u6570\u636e\u6d41\u4e0e\u5b57\u8282\u6570\u7ec4\u6d41<\/h2>\n
\u6570\u636e\u6d41\u7528\u6765\u5b58\u53d6 Java \u539f\u59cb\u7c7b\u578b\uff08long\u3001boolean \u7b49\uff09\uff0c\u672c\u8eab\u662f\u5b57\u8282\u6d41\uff1aDataInputStream<\/code> \u5957 InputStream\uff0cDataOutputStream<\/code> \u5957 OutputStream\u3002\u8bfb\u4fa7\u6709 readBoolean()<\/code>\u3001readInt()<\/code>\u3001readUTF()<\/code>\uff08\u7f51\u7edc\u4f20\u8f93\u5e38\u7528\uff09\uff1b\u5199\u4fa7\u65b9\u6cd5\u57fa\u672c\u4e00\u4e00\u5bf9\u5e94\u3002<\/p>\n
ByteArrayOutputStream<\/code> \u628a\u5185\u5bb9\u5199\u8fdb\u5185\u5b58\u5b57\u8282\u6570\u7ec4\uff0ctoByteArray()<\/code> \u53d6\u51fa\uff1bByteArrayInputStream<\/code> \u5305\u4f4f\u4e00\u4e2a\u5b57\u8282\u6570\u7ec4\uff0cavailable()<\/code> \u770b\u8fd8\u5269\u591a\u5c11\u5b57\u8282\u3002<\/p>\n
ByteArrayOutputStream baos = new ByteArrayOutputStream();\nDataOutputStream dos = new DataOutputStream(baos);\ntry {\n    dos.writeDouble(Math.random());\n    dos.writeBoolean(true);\n    ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());\n    System.out.println(bais.available());\n    DataInputStream dis = new DataInputStream(bais);\n    System.out.println(dis.readDouble());\n    System.out.println(dis.readBoolean());\n    dos.close();\n    dis.close();\n} catch (IOException e) {\n    e.printStackTrace();\n}<\/code><\/pre>\n
\u4e94\u3001Print \u6d41\u4e0e Object \u6d41<\/h2>\n
Print \u6d41\u53ea\u6709\u8f93\u51fa\u3001\u6ca1\u6709\u8f93\u5165\u3002PrintWriter<\/code> \u5bf9\u5b57\u7b26\uff0cPrintStream<\/code> \u5bf9\u5b57\u8282\u3002\u4e24\u8005\u63d0\u4f9b\u91cd\u8f7d\u7684 print \/ println\uff0c\u8f93\u51fa\u64cd\u4f5c\u4e0d\u629b\u5f02\u5e38\uff0c\u5e76\u6709\u81ea\u52a8 flush\u3002System.setOut(OutputStream)<\/code> \u53ef\u6539\u7cfb\u7edf\u9ed8\u8ba4\u8f93\u51fa\u6d41\u3002<\/p>\n
Object \u6d41\u76f8\u5f53\u4e8e\u628a\u5bf9\u8c61\u5e8f\u5217\u5316\u540e\u5199\u5165\u6216\u8bfb\u51fa\u3002\u9700\u8981\u5e8f\u5217\u5316\u7684\u7c7b\u5fc5\u987b\u5b9e\u73b0 Serializable<\/code>\uff1btransient<\/code> \u6807\u8bb0\u7684\u6210\u5458\u4e0d\u53c2\u4e0e\u5e8f\u5217\u5316\u3002\u4e3b\u8981\u65b9\u6cd5\uff1awriteObject(Object)<\/code>\u3001readObject()<\/code>\uff0c\u8bfb\u51fa\u662f Object\uff0c\u8981\u5f3a\u8f6c\u3002<\/p>\n
import java.io.*;\n\npublic class TestObjectIO {\n    public static void main(String args[]) throws Exception {\n        T t = new T();\n        t.k = 8;\n        FileOutputStream fos = new FileOutputStream(\"d:\/share\/java\/io\/testobjectio.dat\");\n        ObjectOutputStream oos = new ObjectOutputStream(fos);\n        oos.writeObject(t);\n        oos.flush();\n        oos.close();\n\n        FileInputStream fis = new FileInputStream(\"d:\/share\/java\/io\/testobjectio.dat\");\n        ObjectInputStream ois = new ObjectInputStream(fis);\n        T tReaded = (T) ois.readObject();\n        System.out.println(tReaded.i + \" \" + tReaded.j + \" \" + tReaded.d + \" \" + tReaded.k);\n    }\n}\n\nclass T implements Serializable {\n    int i = 10;\n    int j = 9;\n    double d = 2.3;\n    transient int k = 15;\n}<\/code><\/pre>\n
\u4e0a\u9762\u628a k \u6539\u6210 8 \u518d\u5199\u5165\uff0c\u4f46 k \u662f transient\uff0c\u8bfb\u56de\u6765\u4ecd\u662f\u9ed8\u8ba4 15\uff0c\u4e0d\u4f1a\u53d8\u6210 8\u3002<\/p>\n
\n
\u4e00\u53e5\u8bdd\u603b\u7ed3\uff1a\u56db\u4e2a\u57fa\u7c7b\u5b9a\u65b9\u5411\u548c\u5355\u4f4d\uff0c\u8282\u70b9\u6d41\u8fde\u8bbe\u5907\uff0c\u5904\u7406\u6d41\u5f80\u4e0a\u5957\uff08\u7f13\u51b2\u3001\u8f6c\u6362\u3001\u6570\u636e\u3001\u6253\u5370\u3001\u5bf9\u8c61\uff09\uff1b\u8bfb\u5230 -1 \u7ed3\u675f\uff0c\u5199\u5b8c\u8bb0\u5f97 flush \/ close\uff0c\u5e8f\u5217\u5316\u8bb0\u5f97 Serializable \u548c transient\u3002<\/strong><\/p>\n<\/blockquote>\n<\/section>\n","protected":false},"excerpt":{"rendered":"
Java \u7684 IO \u53ef\u4ee5\u6309\u4e09\u4e2a\u8f74\u6765\u8bb0\uff1a\u65b9\u5411\uff08\u8f93\u5165 \/ \u8f93\u51fa\uff09\u3001\u6570\u636e\u5355\u4f4d\uff08\u5b57\u8282 \/ \u5b57\u7b26\uff09\u3001\u529f\u80fd\uff08\u8282\u70b9\u6d41 \/ \u5904 […]<\/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":3,"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}]}}