10.26的总结, 管道流用法, RandomAccessFile, DataStream 有待深入.

  1 package test;
  2 import java.io.*;
  3 import java.nio.channels.FileChannel;
  4 import java.util.*;
  5 public class Test10_26
  6 {
  7     public static void main(String[] args) throws Exception
  8     {
  9                 
 10     }
 11     public static void method_delete()
 12     {
 13         File dir = new File("D:\\testdir\\111");
 14         removeDir(dir);
 15     }
 16     private static void removeDir(File dir)
 17     {
 18         File[] files = dir.listFiles();
 19         for (File f : files)
 20         {
 21             if (f.isDirectory())
 22             {
 23                 removeDir(f);
 24             }
 25             else
 26             {
 27                 System.out.println(f.toString() + "-file-" + f.delete());
 28                 ;
 29             }
 30         }
 31         System.out.println(dir + "-dir-" + dir.delete());
 32         ;
 33     }
 34     public static void method_PrintWriter() throws IOException
 35     {
 36         BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in));
 37         PrintWriter out = new PrintWriter(new FileWriter("d:/a.txt"), true); // 实时刷新好啊,
 38         for (String line = null; (line = bufr.readLine()) != null;)
 39         {
 40             if ("over".equals(line))
 41                 break;
 42             System.out.println(line.toUpperCase());
 43             out.println(line.toUpperCase());// 不用操心 写不写 flush()了
 44         }
 45         bufr.close();
 46         out.close();
 47     }
 48     public static void method_SequenceInputStream_ArrayList() throws IOException
 49     {
 50         ArrayList<InputStream> list = new ArrayList<InputStream>();
 51         File dir = new File("D:/splitfiles");
 52         for (int i = 0; i < 4; i++)
 53         {
 54             list.add(new FileInputStream(new File(dir, i + ".part")));
 55         }
 56         final Iterator<InputStream> it = list.iterator();
 57         Enumeration<InputStream> en = new Enumeration<InputStream>()
 58         {
 59             public InputStream nextElement()
 60             {
 61                 return it.next();
 62             }
 63             public boolean hasMoreElements()
 64             {
 65                 return it.hasNext();
 66             }
 67         };
 68         SequenceInputStream sis = new SequenceInputStream(en);
 69         BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("D:/splitfiles/1.mp4"));
 70         int len = 0;
 71         for (byte[] buf = new byte[1024 * 1024]; (len = sis.read(buf)) != -1;)
 72         {
 73             bos.write(buf, 0, len);
 74             bos.flush();
 75         }
 76         sis.close();
 77         bos.close();
 78     }
 79     public static void method_splitfile() throws IOException
 80     {
 81         File file = new File("D:/222.mp4");
 82         FileInputStream fis = new FileInputStream(file);
 83         FileOutputStream fos = null;
 84         int len = 0;
 85         int count = 0;
 86         q: while (true)
 87         {
 88             File f = new File("D:/splitfiles/" + (count++) + ".part");
 89             fos = new FileOutputStream(f);
 90             for (byte[] buf = new byte[1024 * 1024]; (len = fis.read(buf)) != -1;)
 91             {
 92                 fos.write(buf, 0, len);
 93                 if (f.length() >= 1024 * 1024 * 200)
 94                 {
 95                     continue q;
 96                 }
 97             }
 98             break;
 99         }
100     }
101     public static void method_ByteArrayOutputStream() throws Exception //
102     {
103         FileInputStream fis = new FileInputStream("D:/111.bmp");
104         BufferedInputStream bis = new BufferedInputStream(fis);
105         ByteArrayOutputStream baos = new ByteArrayOutputStream();
106         for (int ch = 0; (ch = bis.read()) != -1;)
107         {
108             baos.write(ch);
109         }
110         bis.close();
111         System.out.println(baos.size());
112         BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("D:/111_copy.bmp"));
113         baos.writeTo(bos); // baos里一直存着图片, 优点!!
114         byte[] retArr = baos.toByteArray(); // 可以用ByteArrayInputStream 读取呀.笨
115         System.out.println(retArr.length);
116     }
117     public static void method_SequenceInputStream() throws Exception
118     {
119         Vector<InputStream> vector = new Vector<InputStream>();
120         vector.add(new FileInputStream("D:/33.mp3"));
121         vector.add(new FileInputStream("D:/44.mp3"));
122         vector.add(new FileInputStream("D:/55.mp3"));
123         Enumeration<InputStream> et = vector.elements();
124         SequenceInputStream sis = new SequenceInputStream(et);
125         BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("D:/66.mp3"));
126         int len = 0;
127         for (byte[] buf = new byte[1024 * 1024]; (len = sis.read(buf)) != -1;)
128         {
129             bos.write(buf, 0, len);
130             bos.flush();
131         }
132         sis.close();
133         bos.close();
134     }
135     public static void method_FileChannel() throws Exception
136     {
137         FileChannel in = new FileInputStream("D:/171.bmp").getChannel();
138         FileChannel out = new FileOutputStream("D:/171_copy.bmp").getChannel();
139         out.transferFrom(in, 0, in.size());
140         in.close();
141         out.close();
142     }
143 }