A simple Java program to the utility of excessive: binary file read and write

File I/O Common Files Read and write:

1. Byte stream read/write text file

FileInputStream;

FileOutputStream;

2. Character stream read and write text file

FileReader;

FileWriter;

BufferedReader;

BufferedWriter;

3. Binary read and write files

DataInputStream;

DataOutputStream;

Here we focus on reading and writing binary files:

First, using the byte stream class DataInputStream read and write binary files

The DataInputStream class is a subclass of FileInputStream, which is an extension of the FileInputStream class.

Use the DataInputStream class to read binary files to the FileInputStream class.

Specific procedures:

1) Introduction of related classes

2) construct a data flow object

3) Read the data of the binary file using the method of the data input stream class

Dis.read ();//Read byte data

4) Turn off the data input stream

Dis.close ();//close data input stream

Second, using the byte stream class DataOutputStream write the binary file

The DataOutputStream class is a subclass of FileOutputStream and needs to use the FileOutputStream class.

Specific procedures:

1) Introduction of related classes

2) construct a data output stream object

3) write the data of the binary file using the method of the data output stream class

Out.write (1);//writes the specified byte data to the binary file

4) Turn off the data output stream

Out.close ();

C. Write a Java program to read the Win.ini file in the Windows directory and output its contents

1 ImportJava.io.DataInputStream;2 ImportJava.io.FileInputStream;3 Importjava.io.FileNotFoundException;4 Importjava.io.IOException;5 6 /**7 * Write a Java program to read the Win.ini file in the Windows directory and output its contents8  * @authorAdministrator9  *Ten  */ One  Public classTest041 { A  -      Public Static voidMain (string[] args) { -DataInputStream dis =NULL; the         Try { -             /*creating a binary input stream*/ -dis =NewDataInputStream (NewFileInputStream ("C:\\windows\\win.ini")); -              +             /*loop Read and output information*/ -             inttemp; +              while((Temp=dis.read ())!=-1){ ASystem.out.print ((Char) temp); at             } -}Catch(FileNotFoundException e) { - e.printstacktrace (); -}Catch(IOException e) { - e.printstacktrace (); -         } in         finally{ -             if(dis!=NULL) { to                 Try { + dis.close (); -}Catch(IOException e) { the e.printstacktrace (); *                 } $             }Panax Notoginseng         } -  the     } +  A}

The DataInputStream class is used in conjunction with the DataOutputStream class to read data of the base data type from the stream in a platform-independent manner

The 1.DataInputStream readUTF () method can read strings encoded with utf-8 characters;

The writeUTF () method of 2.DataOutputStream can write a string with utf-8 character encoding;

Test: Copy Picture

1 ImportJava.io.DataInputStream;2 ImportJava.io.DataOutputStream;3 ImportJava.io.FileInputStream;4 ImportJava.io.FileOutputStream;5 Importjava.io.IOException;6 7 /**8 * Copy picture (binary byte stream)9  * @authorAdministratorTen  * One  */ A  Public classTest004 { -  -      Public Static voidMain (string[] args) { theFileInputStream FIS =NULL; -FileOutputStream fos =NULL; -DataInputStream dis =NULL; -DataOutputStream dos =NULL; +         Try { -             //Create an input stream +FIS =NewFileInputStream ("D:\\tengyicheng\\timg.jpg"); Adis =NewDataInputStream (FIS); at             //Create an output stream -FOS =NewFileOutputStream ("D:\\tengyicheng\\myfile\\timg.jpg"); -DOS =NewDataOutputStream (FOS); -             //Loop Read Input -             inttemp; -              while(temp = Dis.read ())!=-1){ in Dos.write (temp); -             } to}Catch(IOException e) { + e.printstacktrace (); -         } the         finally{ *             Try { $                 if(fis!=NULL) {Panax Notoginseng fis.close (); -                 } the                 if(fos!=NULL) { + fos.close (); A                 } the                 if(dis!=NULL) { + dis.close (); -                 } $                 if(dos!=NULL) { $ dos.close (); -                 } -}Catch(IOException e) { the e.printstacktrace (); -             }Wuyi         } the  -     } Wu  -}

A simple Java program to the utility of excessive: binary file read and write