java二进制文件的读写

 1 import java.io.DataInputStream;
 2 import java.io.DataOutputStream;
 3 import java.io.File;
 4 import java.io.FileInputStream;
 5 import java.io.FileOutputStream;
 6 import java.io.IOException;
 7 
 8 /* @comany 阿斯达克(深圳)信息技术有限公司
 9 * @author steven.wu
10 * @since 2009.8.11
11 * @description read and write stream for binary file。
12 */
13 public class BinaryReadWrite {
14     private DataInputStream dis=null;
15     private DataOutputStream dos=null;
16     private String s_FilePath="d:/bin.dat";
17     private byte[] m_datapadding = { 0x00 }; //填充空白，以补足字节位数.
18     
19     public BinaryReadWrite() {
20         // TODO Auto-generated constructor stub
21         init();
22     }
23     private void init(){
24         try{
25             if(!new File(s_FilePath).exists()){
26                 new File(s_FilePath).createNewFile();
27             }
28             dis=new DataInputStream(new FileInputStream(new File(s_FilePath)));
29             dos=new DataOutputStream(new FileOutputStream(new File(s_FilePath),true));////如果文件存在，这追加数据true
30         }catch(Exception e){
31             e.printStackTrace();
32         }
33     }
34     public void writeBinaryStream(){
35         try{
36             if(dos!=null){
37                 for(int i=0;i<2;i++){
38                     //write boolean value.
39                     dos.writeBoolean(true);
40                     //write a char value.
41                     char c=‘a‘;
42                     dos.writeChar((int)c);
43                     Double d=12.567d;
44                     dos.writeDouble(d);
45                     Float f=56.782f;
46                     dos.writeFloat(f);
47                     int k=105;
48                     dos.writeInt(k);
49                     long l=98765l;
50                     dos.writeLong(l);
51                     short st=12;
52                     dos.writeShort(st);
53                     String cs="Java读写二进制文件";
54                     String cs1="二进制文件";
55                     if(i==0){
56                         dos.writeUTF(cs);
57                     }else{
58                         dos.writeUTF(cs1);
59                     }
60                     dos.write(m_datapadding);
61                 }
62                 dos.flush();
63                 dos.close();
64             }
65         }catch(Exception e){
66             e.printStackTrace();
67         }
68     }
69     public void readBinaryStream(){
70         try{
71             if(dis!=null){
72                 while(dis.available()>0){
73                     System.out.println(dis.available());
74                     System.out.println(dis.readBoolean());
75                     char c=(char)dis.readChar();
76                     System.out.println(c);
77                     System.out.println(dis.readDouble());
78                     System.out.println(dis.readFloat());
79                     System.out.println(dis.readInt());
80                     System.out.println(dis.readLong());
81                     System.out.println(dis.readShort());
82                     System.out.println(dis.readUTF());
83                     System.out.println(dis.read(m_datapadding));
84                 }
85             }
86         }catch(Exception e){
87             e.printStackTrace();
88         }
89     }
90     public static void main(String[] args) throws IOException {
91         BinaryReadWrite bin=new BinaryReadWrite();
92         bin.writeBinaryStream();
93         bin.readBinaryStream();
94     }
95 }