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

9/6/2015来源:Java教程人气:1593

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 Exception118     {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 Exception136     {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 }