Java 讀/寫 二進位檔案
Java 讀/寫 二進位檔案
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
/* @comany 阿斯達克(深圳)資訊技術有限公司
* @author steven.wu
* @since 2009.8.11
* @description read and write stream for binary file。
*/
public class BinaryReadWrite {
private DataInputStream dis=null;
private DataOutputStream dos=null;
private String s_FilePath=”d:/bin.dat”;
private byte[] m_datapadding = { 0x00 }; //填充空白，以補足位元組位元數.
public BinaryReadWrite() {
// TODO Auto-generated constructor stub
init();
}
private void init(){
try{
if(!new File(s_FilePath).exists()){
new File(s_FilePath).createNewFile();
}
dis=new DataInputStream(new FileInputStream(new File(s_FilePath)));
dos=new DataOutputStream(new FileOutputStream(new File(s_FilePath)));
}catch(Exception e){
e.printStackTrace();
}
}
public void writeBinaryStream(){
try{
if(dos!=null){
for(int i=0;i<2;i++){
//write boolean value.
dos.writeBoolean(true);
//write a char value.
char c=’a’;
dos.writeChar((int)c);
Double d=12.567d;
dos.writeDouble(d);
Float f=56.782f;
dos.writeFloat(f);
int k=105;
dos.writeInt(k);
long l=98765l;
dos.writeLong(l);
short st=12;
dos.writeShort(st);
String cs=”Java讀寫二進位檔案”;
String cs1=”二進位檔案”;
if(i==0){
dos.writeUTF(cs);
}else{
dos.writeUTF(cs1);
}
dos.write(m_datapadding);
}
dos.flush();
dos.close();
}
}catch(Exception e){
e.printStackTrace();
}
}
public void readBinaryStream(){
try{
if(dis!=null){
while(dis.available()>0){
System.out.println(dis.available());
System.out.println(dis.readBoolean());
char c=(char)dis.readChar();
System.out.println(c);
System.out.println(dis.readDouble());
System.out.println(dis.readFloat());
System.out.println(dis.readInt());
System.out.println(dis.readLong());
System.out.println(dis.readShort());
System.out.println(dis.readUTF());
System.out.println(dis.read(m_datapadding));
}
}
}catch(Exception e){
e.printStackTrace();
}
}
public static void main(String[] args) throws IOException {
BinaryReadWrite bin=new BinaryReadWrite();
bin.writeBinaryStream();
bin.readBinaryStream();
}
}