{"id":260,"date":"2015-04-17T19:43:40","date_gmt":"2015-04-17T11:43:40","guid":{"rendered":"https:\/\/ai.zhousir.top\/?p=260"},"modified":"2026-08-18T12:09:30","modified_gmt":"2026-08-18T04:09:30","slug":"java%e9%9d%a2%e5%90%91%e5%ad%97%e8%8a%82%e6%b5%81%e7%9a%84%e5%ba%94%e7%94%a8","status":"publish","type":"post","link":"https:\/\/ai.zhousir.top\/?p=260","title":{"rendered":"Java\u9762\u5411\u5b57\u8282\u6d41\u7684\u5e94\u7528"},"content":{"rendered":"
\n

\u9762\u5411\u5b57\u8282\u6d41\u65f6\uff0c\u6700\u5e38\u7528\u7684\u662f\u6587\u4ef6\u5b57\u8282\u6d41\uff1aFileInputStream<\/code> \/ FileOutputStream<\/code>\uff0c\u6309\u987a\u5e8f\u8bfb\u5199\u672c\u5730\u78c1\u76d8\u6587\u4ef6\u3002\u518d\u5f80\u4e0a\u5957\u8fc7\u6ee4\u6d41\uff0c\u5c31\u80fd\u6309\u57fa\u672c\u7c7b\u578b\u5199\u4e8c\u8fdb\u5236\uff1b\u6700\u5916\u5c42\u5219\u662f System.in<\/code> \/ System.out<\/code> \/ System.err<\/code> \u4e09\u5957\u6807\u51c6\u6d41\u3002<\/p>\n

\u4e0b\u9762\u51e0\u4e2a\u4f8b\u5b50\u90fd\u5728\u6559\u6750\u7f16\u53f7 10-5 \u5230 10-10 \u7684\u8303\u56f4\u5185\uff0c\u4ece\u5efa\u6587\u4ef6\u3001\u62f7\u8d1d gif\uff0c\u5230 Data \u6d41\u8bfb\u5199 int\uff0c\u518d\u5230\u952e\u76d8\u5b57\u8282\u3002<\/p>\n

<\/p>\n

\u4e00\u3001\u6587\u4ef6\u8f93\u5165\u8f93\u51fa\u6d41<\/h2>\n

\u3010\u4f8b 10-5\u3011\u7a0b\u5e8f\u521b\u5efa\u4e00\u4e2a\u6587\u4ef6\uff0c\u4ece\u952e\u76d8\u8bfb\u5b57\u7b26\uff0c\u9047\u5230 #<\/code> \u7ed3\u675f\uff0c\u518d\u628a\u6587\u4ef6\u5185\u5bb9\u6253\u5230\u5c4f\u5e55\u4e0a\uff1a<\/p>\n

import java.io.*;\n\nclass ep10_5{\n\n    public static void main(String args[]){\n\n        char ch;\n\n        int data;\n\n        try{\n\n            FileInputStream a=new FileInputStream(FileDescriptor.in);  \/\/\u521b\u5efa\u6587\u4ef6\u8f93\u5165\u6d41\u5bf9\u8c61\n\n            FileOutputStream b=new FileOutputStream(\"ep10_5\");  \/\/\u521b\u5efa\u6587\u4ef6\u8f93\u51fa\u6d41\u5bf9\u8c61\n\n            System.out.println(\"\u8bf7\u8f93\u5165\u5b57\u7b26\uff0c\u4ee5#\u53f7\u7ed3\u675f\uff1a\");\n\n            while((ch=(char)a.read())!='#'){\n\n                b.write(ch);\n\n            }\n\n            a.close();\n\n            b.close();\n\n            System.out.println();\n\n            FileInputStream c=new FileInputStream(\"ep10_5\");\n\n            FileOutputStream d=new FileOutputStream(FileDescriptor.out);\n\n            while(c.available()>0){\n\n               data=c.read();\n\n               d.write(data);\n\n           }\n\n           c.close();d.close();\n\n       }\n\n       catch(FileNotFoundException e){\n\n          System.out.println(\"\u627e\u4e0d\u5230\u8be5\u6587\u4ef6\uff01\");\n\n       }\n\n       catch(IOException e){}\n\n    }\n\n}<\/code><\/pre>\n
FileDescriptor<\/code> \u5728 java.io<\/code> \u4e2d\uff0c\u4e0d\u80fd\u5b9e\u4f8b\u5316\uff0c\u63d0\u4f9b\u4e09\u4e2a\u9759\u6001\u6210\u5458\uff1ain<\/code>\u3001out<\/code>\u3001err<\/code>\uff0c\u5bf9\u5e94\u6807\u51c6\u8f93\u5165\u3001\u6807\u51c6\u8f93\u51fa\u3001\u6807\u51c6\u9519\u8bef\u3002\u7528\u5b83\u4eec\u53ef\u4ee5\u5728\u6807\u51c6\u6d41\u4e0a\u518d\u5305\u4e00\u5c42\u6587\u4ef6\u6d41\uff0c\u5b9e\u73b0\u952e\u76d8\u8f93\u5165\u6216\u5c4f\u5e55\u8f93\u51fa\u3002<\/p>\n
\u3010\u4f8b 10-6\u3011\u5907\u4efd\u4e8c\u8fdb\u5236\u56fe\u5f62\u6587\u4ef6\uff08.gif\uff09\uff1a\u4e00\u6b21 available()<\/code> \u5f97\u5230\u957f\u5ea6\uff0c\u8bfb\u8fdb byte \u6570\u7ec4\u518d\u5199\u51fa\u3002<\/p>\n
import java.io.*;\n\nclass ep10_6{\n\n    public static void main(String args[]) throws IOException{\n\n        FileInputStream a=new FileInputStream(\"ep10_6.gif\");\n\n        FileOutputStream b=new FileOutputStream(\"ep10_6_a.gif\");\n\n        System.out.println(\"\u6587\u4ef6\u7684\u5927\u5c0f\u4e3a\uff1a\"+a.available());\n\n        byte c[]=new byte[a.available()];\n\n        a.read(c);  \/\/\u5c06\u56fe\u5f62\u6587\u4ef6\u8bfb\u5165\u6570\u7ec4\n\n        b.write(c);  \/\/\u5c06\u6570\u7ec4\u4e2d\u7684\u6570\u636e\u5199\u5165\u5230\u65b0\u6587\u4ef6\u4e2d\n\n        System.out.println(\"\u6587\u4ef6\u5df2\u7ecf\u88ab\u66f4\u540d\u590d\u5236\uff01\");\n\n        a.close();\n\n        b.close();\n\n    }\n\n}<\/code><\/pre>\n
\u4e8c\u3001\u8fc7\u6ee4\u6d41\uff1aDataInputStream \/ DataOutputStream<\/h2>\n
FilterInputStream<\/code> \u548c FilterOutputStream<\/code> \u662f\u5b57\u8282\u6d41\u7684\u76f4\u63a5\u5b50\u7c7b\uff0c\u8bfb\u5199\u7684\u540c\u65f6\u53ef\u505a\u7c7b\u578b\u6216\u683c\u5f0f\u8f6c\u6362\uff0c\u4e5f\u5c31\u662f\u7406\u89e3\u4e8c\u8fdb\u5236\u3001\u505a\u7f16\u7801\u8f6c\u6362\u3002\uff08\u539f\u6587\u5199\u6210 FileOutputStream \u4f5c\u4e3a\u8fc7\u6ee4\u6d41\u7236\u7c7b\uff0c\u5e94\u4e3a FilterOutputStream\u3002\uff09<\/p>\n
\u5e38\u7528\u7684\u4e24\u4e2a\u8fc7\u6ee4\u6d41\u662f DataInputStream<\/code> \u548c DataOutputStream<\/code>\uff1a<\/p>\n
    \n
  • \n
    DataInputStream(InputStream in)<\/code>\uff1a\u4ece\u6307\u5b9a\u8f93\u5165\u6d41\u8bfb\u6570\u636e\u3002<\/section>\n<\/li>\n
  • \n
    DataOutputStream(OutputStream out)<\/code>\uff1a\u5411\u6307\u5b9a\u8f93\u51fa\u6d41\u5199\u6570\u636e\u3002<\/section>\n<\/li>\n<\/ul>\n
    \u5b83\u4eec\u5206\u522b\u5b9e\u73b0 DataInput<\/code> \/ DataOutput<\/code>\uff0c\u6309\u4e0e\u673a\u5668\u65e0\u5173\u7684\u683c\u5f0f\u8bfb\u5199\u57fa\u672c\u7c7b\u578b\u3002\u6784\u9020\u65f6\u5fc5\u987b\u628a\u53e6\u4e00\u6761\u5b57\u8282\u6d41\u4f20\u8fdb\u53bb\uff0c\u8fc7\u6ee4\u6d41\u4e0d\u80fd\u5355\u72ec\u5b58\u5728\u3002<\/p>\n
    \u3010\u4f8b 10-7\u3011\u628a\u4e09\u4e2a int\uff1a100\u30010\u3001-100 \u5199\u5165 ep10_7.dat<\/code>\uff1a<\/p>\n
    import java.io.*;\n\nclass ep10_7{\n\n    public static void main(String args[]){\n\n        String fileName=\"ep10_7.dat\";\n\n        int value1=100,value2=0,value3=-100;\n\n        try{\n\n            \/\/\u5c06 DataOutputStream \u4e0e FileOutputStream \u8fde\u63a5\u8f93\u51fa\u4e0d\u540c\u7c7b\u578b\u7684\u6570\u636e\n\n            DataOutputStream a=new DataOutputStream(new FileOutputStream(fileName));\n\n            a.writeInt(value1);\n\n            a.writeInt(value2);\n\n            a.writeInt(value3);\n\n            a.close();\n\n        }\n\n        catch(IOException i){\n\n            System.out.println(\"\u51fa\u73b0\u9519\u8bef!\"+fileName);\n\n        }\n\n    }\n\n}<\/code><\/pre>\n
    \u7528\u6587\u672c\u7f16\u8f91\u5668\u6253\u5f00\u4f1a\u770b\u5230\u4e8c\u8fdb\u5236\uff1a00 00 00 64 00 00 00 00 FF FF FF 9C<\/code>\u3002<\/p>\n
    \u3010\u4f8b 10-8\u3011\u8bfb\u56de\u8fd9\u4e09\u4e2a int \u5e76\u6c42\u548c\uff08100 + 0 + (\u2212100) = 0\uff09\uff1a<\/p>\n
    import java.io.*;\n\nclass ep10_8{\n\n    public static void main(String args[]){\n\n        String fileName=\"D:\\\\myjava\/ep10_7.dat\";\n\n        int sum=0;\n\n        try{\n\n            DataInputStream a=new DataInputStream(new BufferedInputStream(new FileInputStream(fileName)));\n\n            sum+=a.readInt();\n\n            sum+=a.readInt();\n\n            sum+=a.readInt();\n\n            System.out.println(\"\u4e09\u4e2a\u6570\u7684\u548c\u4e3a\uff1a\"+sum);\n\n            a.close();\n\n        }\n\n        catch(IOException e){\n\n            System.out.println(\"\u51fa\u73b0\u9519\u8bef\uff01\"+fileName);\n\n        }\n\n    }\n\n}\n\n\u8fd0\u884c\u7ed3\u679c\uff1a\n\n\u4e09\u4e2a\u6570\u7684\u548c\u4e3a\uff1a0<\/code><\/pre>\n
    readInt()<\/code> \u4ece\u6d41\u91cc\u8bfb 4 \u4e2a\u5b57\u8282\u5f53 int\u3002\u5df2\u77e5\u6b63\u597d 3 \u4e2a\u6570\u53ef\u4ee5\u5199 3 \u6761\u8bfb\u8bed\u53e5\uff1b\u82e5\u53ea\u77e5\u9053\u662f int\u3001\u4e0d\u77e5\u9053\u4e2a\u6570\uff0c\u8bfb\u5230\u6587\u4ef6\u5c3e\u4f1a\u629b EOFException<\/code>\uff0c\u53ef\u628a\u8bfb\u5faa\u73af\u653e\u8fdb try\uff1a<\/p>\n
    import java.io.*;\n\nclass ep10_9{\n\n    public static void main(String args[]) throws IOException{\n\n        DataInputStream a=new DataInputStream(System.in);\n\n        System.out.print(\"\u8bf7\u8f93\u5165\u4e00\u4e2a\u6574\u6570\uff1a\");\n\n        int b=a.readInt();\n\n        int sum=0;\n\n        int c=b;\n\n        while(c>0){\n\n            int d=c%10;  \/\/\u53d6\u6700\u4f4e\u4f4d\n\n            c=c\/10;  \/\/\u53bb\u6389\u6700\u4f4e\u4f4d\n\n            sum=sum+d;  \/\/\u7d2f\u52a0\u5404\u4f4d\u4e4b\u548c\n\n        }\n\n        System.out.println(b+\"\u7684\u5404\u4f4d\u6570\u5b57\u4e4b\u548c=\"+sum);\n\n    }\n\n}\n\n\u8fd0\u884c\u7ed3\u679c\uff1a\n\n\u8bf7\u8f93\u5165\u4e00\u4e2a\u6574\u6570\uff1a26\n\n842403082 \u7684\u5404\u4f4d\u6570\u5b57\u4e4b\u548c=31<\/code><\/pre>\n
    EOFException<\/code> \u662f IOException<\/code> \u7684\u5b50\u7c7b\uff1a\u53ea\u6709\u78b0\u5230\u6587\u4ef6\u7ed3\u675f\u624d\u4f1a\u8fdb\u8fd9\u4e2a catch\uff1b\u8bfb\u5230\u4e00\u534a\u51fa\u9519\u4ecd\u662f\u666e\u901a IOException\u3002<\/p>\n
    \u3010\u4f8b 10-9\u3011\u4ece\u952e\u76d8\u8bfb\u4e00\u4e2a\u6574\u6570\uff0c\u6c42\u5404\u4f4d\u6570\u5b57\u4e4b\u548c\uff1a<\/p>\n
    try{\n\n    while(true)\n\n    sum+=a.readInt();\n\n}\n\ncatch(EOFException e){\n\n    System.out.pritnln(\"\u4e09\u4e2a\u6570\u7684\u548c\u4e3a\uff1a\"+sum);\n\n    a.close();\n\n}<\/code><\/pre>\n
    \u6ce8\u610f\uff1a\u8f93\u5165 26\uff0c\u7a0b\u5e8f\u5374\u53ef\u80fd\u6253\u51fa 842403082<\/code> \u8fd9\u7c7b\u5927\u6570\u3002\u56e0\u4e3a DataInputStream.readInt()<\/code> \u8981\u7684\u662f int \u7684\u56db\u5b57\u8282\u4e8c\u8fdb\u5236\uff0c\u952e\u76d8\u9001\u6765\u7684\u662f\u5b57\u7b26 ‘2’\u3001’6′ \u7684\u5b57\u8282\uff0c\u5e76\u4e0d\u662f\u6574\u6570 26 \u7684\u8865\u7801\u3002\u8981\u4ece\u952e\u76d8\u62ff\u6574\u6570\uff0c\u5e94\u5148\u8bfb\u5b57\u7b26\u4e32\u518d\u8f6c\u6362\u3002<\/p>\n\n\n\n\n\n\n\n
    \u6d41<\/th>\n\u804c\u8d23<\/th>\n\u6ce8\u610f<\/th>\n<\/tr>\n<\/thead>\n
    FileInput\/OutputStream<\/td>\n\u987a\u5e8f\u8bfb\u5199\u672c\u5730\u6587\u4ef6<\/td>\n\u4f8b 10-5 \/ 10-6<\/td>\n<\/tr>\n
    DataInput\/OutputStream<\/td>\n\u6309\u57fa\u672c\u7c7b\u578b\u8bfb\u5199\u4e8c\u8fdb\u5236<\/td>\n\u5fc5\u987b\u5305\u5728\u53e6\u4e00\u6761\u5b57\u8282\u6d41\u4e0a<\/td>\n<\/tr>\n
    System.in \/ out \/ err<\/td>\n\u6807\u51c6\u8f93\u5165\u3001\u8f93\u51fa\u3001\u9519\u8bef<\/td>\n\u7f16\u8bd1\u65f6\u81ea\u52a8\u52a0\u8f7d<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
    \u4e09\u3001\u6807\u51c6\u8f93\u5165\u8f93\u51fa<\/h2>\n
    System.in<\/code>\u3001System.out<\/code>\u3001System.err<\/code> \u5b9a\u4e49\u5728 java.lang.System<\/code>\uff0c\u6e90\u7a0b\u5e8f\u7f16\u8bd1\u65f6\u81ea\u52a8\u52a0\u8f7d\u3002<\/p>\n
      \n
    • \n
      \u6807\u51c6\u8f93\u5165<\/strong> System.in<\/code> \u662f BufferedInputStream\uff1aread()<\/code> \u4ece\u952e\u76d8\u7f13\u51b2\u533a\u8bfb\u4e00\u5b57\u8282\uff0c\u8fd4\u56de\u4f4e\u4f4d\u4e3a\u8be5\u5b57\u8282\u3001\u9ad8\u4f4d\u4e3a 0 \u7684 int\u3002<\/section>\n<\/li>\n
    • \n
      \u6807\u51c6\u8f93\u51fa<\/strong> System.out<\/code> \u662f PrintStream\uff08FilterOutputStream \u5b50\u7c7b\uff09\uff0c\u63d0\u4f9b print<\/code> \/ println<\/code>\u3002<\/section>\n<\/li>\n
    • \n
      \u6807\u51c6\u9519\u8bef<\/strong> System.err<\/code> \u4e5f\u662f PrintStream\uff0c\u4e13\u95e8\u628a\u9519\u8bef\u6253\u5230\u5c4f\u5e55\u4e0a\uff0c\u65b9\u4fbf\u8c03\u8bd5\u3002<\/section>\n<\/li>\n<\/ul>\n
      \u3010\u4f8b 10-10\u3011\u8f93\u5165\u4e00\u4e32\u5b57\u7b26\u5e76\u663e\u793a\uff0c\u540c\u65f6\u6253\u5370 in\u3001out \u6240\u5c5e\u7684\u7c7b\uff1a<\/p>\n
      import java.io.*;\n\nclass ep10_10{\n\n    public static void main(String args[]){\n\n        try{\n\n            byte a[]=new byte[128];  \/\/\u8bbe\u7f6e\u8f93\u5165\u7f13\u51b2\u533a\n\n            System.out.print(\"\u8bf7\u8f93\u5165\u5b57\u7b26\u4e32\uff1a\");\n\n            int count =System.in.read(a);  \/\/\u8bfb\u53d6\u6807\u51c6\u8f93\u5165\u8f93\u51fa\u6d41\n\n            System.out.println(\"\u8f93\u5165\u7684\u662f\uff1a\");\n\n            for(int i=0;i<count;i++)\n\n               System.out.print(a[i]+\"\");  \/\/\u8f93\u51fa\u6570\u7ec4\u5143\u7d20\u7684 ASCII \u503c\n\n            System.out.println();\n\n            for(int i=0;i<count-2;i++)  \/\/\u4e0d\u663e\u793a\u56de\u8f66\u548c\u6362\u884c\u7b26\n\n                System.out.print((char)a[i]+\"\");  \/\/\u6309\u5b57\u7b26\u65b9\u5f0f\u8f93\u51fa\u5143\u7d20\n\n            System.out.println();\n\n            System.out.println(\"\u8f93\u5165\u7684\u5b57\u7b26\u4e2a\u6570\u4e3a\uff1a\"+count);\n\n            Class InClass=System.in.getClass();\n\n            Class OutClass=System.out.getClass();\n\n            System.out.println(\"in \u6240\u5728\u7684\u7c7b\u4e3a\uff1a\"+InClass.toString());\n\n            System.out.println(\"out \u6240\u5728\u7684\u7c7b\u4e3a\uff1a\"+OutClass.toString());\n\n        }\n\n        catch(IOException e){}\n\n    }\n\n}<\/code><\/pre>\n
      \u8f93\u5165 3 \u4e2a\u5b57\u7b26\u518d\u56de\u8f66\uff0c\u8ba1\u6570\u5e38\u5e38\u662f 5\uff1aJava \u628a\u56de\u8f66\u5f53\u6210\u4e24\u4e2a\u5b57\u7b26\uff08ASCII 13 \u7684 CR \u548c 10 \u7684 LF\uff09\u3002getClass()<\/code> \/ toString()<\/code> \u6765\u81ea Object\uff0c\u5206\u522b\u8fd4\u56de\u8fd0\u884c\u65f6\u7c7b\u548c\u5b57\u7b26\u4e32\u8868\u793a\u3002<\/p>\n
      \n
      \u4e00\u53e5\u8bdd\u603b\u7ed3\uff1a\u5b57\u8282\u6d41\u5148\u843d\u5730\u6587\u4ef6\uff0c\u518d\u7528 Data \u6d41\u6309\u7c7b\u578b\u8bfb\u5199\uff1b\u952e\u76d8\u4e0a\u7684\u5b57\u7b26\u4e0d\u662f int \u7684\u56db\u5b57\u8282\uff0c\u522b\u62ff readInt \u76f4\u63a5\u7838 System.in\u3002<\/strong><\/p>\n<\/blockquote>\n<\/section>\n","protected":false},"excerpt":{"rendered":"
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