字节流

 1 范例：
 2 public class ByteDemo {
 3     public static void main(String[] args) {
 4         OutputStream os = null;
 5         InputStream is = null;
 6         FileOutputStream os1 = null;
 7         try {
 8             //1.创建文本文件
 9             os = new FileOutputStream("E:\Java实训课总结\2016.3.26\我的青春谁做主.txt");
10             String str = "我的青春我做主，燃烧吧，少年！";
11             String str2 = "yimifkaskfdajiofjaeiomvm我是几的司法计算女";
12             byte[] b = str.getBytes();
13             byte[] b2 = str2.getBytes();
14             os.write(b);
15             os.write(b2);
16             os.flush();
17             
18             //2.读取文本内容
19             is = new FileInputStream("E:\Java实训课总结\2016.3.26\我的青春谁做主.txt");
20             byte[] data = new byte[1024];
21             int len = -1;
22             //★len = is.read(data,0,data.length)★ 或者 ★i = is.read(copyData)★ // os1.write(copyData,0,copyData.length);
23             while ((len = is.read(data,0,data.length)) != -1) {
24                 System.out.println(new String(data));
25             }
26             
27             //3.文件内容复制到另一个文本文件中
28             os1 = new FileOutputStream("E:\Java实训课总结\2016.3.26\我的青春谁做主copy.txt");
29             byte[] copyData = new byte[1024];
30             int i = -1;
31             /**
32              * 1.字符流，如何读出的中文不是乱码,★打印的是new String(data)/new String(copyData)★
33              * 2.怎么读取中英文本。同上              
34              */
35             while(((i = is.read(copyData)) != -1)) {
36                 os1.write(copyData,0,copyData.length);
37                 System.out.println(new String(copyData));
38             }
39             //显示文本内容
40             os1.flush();
41             System.out.println("复制完成");
42         } catch (IOException e) {
43             e.printStackTrace();
44         } finally {
45             try {
46 //                os1.close();
47                 os.close();
48                 is.close();
49             } catch (IOException e) {
50                 e.printStackTrace();
51             }
52         }
53     }
54 }
55 
56 -------------------二进制文件读写---------------------    
57 DataInputStream
58     FileInputStream的子类
59     与其父类一起使用，读取二进制文件
60 
61 DataOutputStream
62     FileOutputStream的子类
63     与其父类一起使用，写出二进制文件
64 范例：
65 public class DataStreamDemo {
66     public static void main(String[] args) {
67         DataInputStream dis = null;
68         DataOutputStream dos = null;
69         try {
70             //构建二进制数据的输入流
71             dis = new DataInputStream(new FileInputStream("D:\Documents\My Pictures\DSCF7863 (1).jpg"));
72             //构建二进制数据的输出流
73             dos = new DataOutputStream(new FileOutputStream("E:\Java实训课总结\2016.3.26" + File.separator + "picture.jpg"));
74             //读写文件
75             int len;
76             while ((len = dis.read()) != -1) {
77                 dos.write(len);
78             }
79         } catch (FileNotFoundException e) {
80             e.printStackTrace();
81         } catch (IOException e) {
82             e.printStackTrace();
83         } finally {
84             //关闭流
85             try {
86                 dos.close();
87                 dis.close();
88             } catch (IOException e) {
89                 e.printStackTrace();
90             }
91         }
92     }
93 }