자바 파일 입출력

Posted on: 2017년 05월 28일 2017년 05월 28일
Categories: 강의자료, 자바

FileInputStream/FileOutputStream

public void f_InOutStream() throws IOException{
	FileInputStream in = null;
	FileOutputStream out = null;

	try{
		in = new FileInputStream("C:\\a.txt");
		out = new FileOutputStream("C:\\b.txt");

		int c;
		int n = 0;
		while((c = in.read()) != -1){
			out.write(c);
			n++;
		}
		System.out.println("InOutStream : " + n);
	}
	catch(Exception e){
		e.setStackTrace(null);
	}
	finally{
		if(in != null){
			in.close();
		}
		if(out != null){
			out.close();
		}
	}
}

public void f_InOutStream() throws IOException{

FileInputStream in = null;

FileOutputStream out = null;

try{

in = new FileInputStream("C:\\a.txt");

out = new FileOutputStream("C:\\b.txt");

int c;

int n = 0;

while((c = in.read()) != -1){

out.write(c);

n++;

}

System.out.println("InOutStream : " + n);

}

catch(Exception e){

e.setStackTrace(null);

}

finally{

if(in != null){

in.close();

}

if(out != null){

out.close();

}

BufferedInputStream/BufferedOutputStream

public void f_BufferedInOutStream() throws IOException{
	BufferedInputStream in = null;
	BufferedOutputStream out = null;

	try{
		in = new BufferedInputStream(new FileInputStream("C:\\a.txt"));
		out = new BufferedOutputStream(new FileOutputStream("C:\\b.txt"));

		int c;
		int n = 0;
		while((c = in.read()) != -1){
			out.write(c);
			n++;
		}
		System.out.println("BufferedInOutStream : " + n);
	}
	catch(Exception e){
		e.setStackTrace(null);
	}
	finally{
		if(in != null){
			in.close();
		}
		if(out != null){
			out.close();
		}
	}
}

public void f_BufferedInOutStream() throws IOException{

BufferedInputStream in = null;

BufferedOutputStream out = null;

try{

in = new BufferedInputStream(new FileInputStream("C:\\a.txt"));

out = new BufferedOutputStream(new FileOutputStream("C:\\b.txt"));

int c;

int n = 0;

while((c = in.read()) != -1){

out.write(c);

n++;

}

System.out.println("BufferedInOutStream : " + n);

}

catch(Exception e){

e.setStackTrace(null);

}

finally{

if(in != null){

in.close();

}

if(out != null){

out.close();

}

FileReader/FileWriter

public void f_ReadWriter() throws IOException{
	FileReader in = null;
	FileWriter out = null;
	try{
		in = new FileReader("C:\\a.txt");
		out = new FileWriter("C:\\b.txt");

		int c;
		int n = 0;
		while((c = in.read()) != -1){
			out.write(c);
			n++;
		}
		System.out.println("ReadWriter : " + n);
	}
	catch(Exception e){
		e.setStackTrace(null);
	}
	finally{
		if(in != null){
			in.close();
		}
		if(out != null){
			out.close();
		}
	}
}

public void f_ReadWriter() throws IOException{

FileReader in = null;

FileWriter out = null;

try{

in = new FileReader("C:\\a.txt");

out = new FileWriter("C:\\b.txt");

int c;

int n = 0;

while((c = in.read()) != -1){

out.write(c);

n++;

}

System.out.println("ReadWriter : " + n);

}

catch(Exception e){

e.setStackTrace(null);

}

finally{

if(in != null){

in.close();

}

if(out != null){

out.close();

}

BufferedReader/BufferedWriter

public void f_BufferReadWriter() throws IOException{
	BufferedReader in = null;
	BufferedWriter out = null;

	try{
		in = new BufferedReader(new FileReader("C:\\a.txt"));
		out = new BufferedWriter(new FileWriter("C:\\b.txt"));

		int c;
		int n = 0;
		while((c = in.read()) != -1){
			out.write(c);
			n++;
		}
		System.out.println("BufferedReadWriter : " + n);
	}
	catch(Exception e){
		e.setStackTrace(null);
	}
	finally{
		if(in != null){
			in.close();
		}
		if(out != null){
			out.close();
		}
	}
}

public void f_BufferReadWriter() throws IOException{

BufferedReader in = null;

BufferedWriter out = null;

try{

in = new BufferedReader(new FileReader("C:\\a.txt"));

out = new BufferedWriter(new FileWriter("C:\\b.txt"));

int c;

int n = 0;

while((c = in.read()) != -1){

out.write(c);

n++;

}

System.out.println("BufferedReadWriter : " + n);

}

catch(Exception e){

e.setStackTrace(null);

}

finally{

if(in != null){

in.close();

}

if(out != null){

out.close();

}

utf8과 euckr 선택하여 읽고 쓰기

public void f_BufferReadWriterUTF8() throws IOException{
	BufferedReader in = null;
	BufferedWriter out = null;

	try{
		in = new BufferedReader(new InputStreamReader(new FileInputStream("C:\\a.txt"), "UTF-8")); //EUCKR
		out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("C:\\b.txt"),"UTF-8")); //EUCKR

		int c;
		int n = 0;
		while((c = in.read()) != -1){
			out.write(c);
			n++;
		}
		System.out.println("BufferedReadWriter : " + n);
	}
	catch(Exception e){
		e.setStackTrace(null);
	}
	finally{
		if(in != null){
			in.close();
		}
		if(out != null){
			out.close();
		}
	}
}

public void f_BufferReadWriterUTF8() throws IOException{

BufferedReader in = null;

BufferedWriter out = null;

try{

in = new BufferedReader(new InputStreamReader(new FileInputStream("C:\\a.txt"), "UTF-8")); //EUCKR

out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("C:\\b.txt"),"UTF-8")); //EUCKR

int c;

int n = 0;

while((c = in.read()) != -1){

out.write(c);

n++;

}

System.out.println("BufferedReadWriter : " + n);

}

catch(Exception e){

e.setStackTrace(null);

}

finally{

if(in != null){

in.close();

}

if(out != null){

out.close();

}

Scanner/PrintWriter

public void f_ScannerPrintWriter(){
	Scanner in = null;
	PrintWriter out = null;

	try{
		in = new Scanner(new BufferedReader(new FileReader("C:\\a.txt")));
		out = new PrintWriter(new BufferedWriter(new FileWriter("C:\\b.txt")));

		String c;
		int n = 0;
		while(in.hasNext()){
			c = in.nextLine();
			out.println(c);
			n++;
		}
		System.out.println("ScannerPrintWriter : " + n);
	}
	catch(Exception e){
		System.out.println("error");
	}
	finally{
		if(in != null){
			in.close();
		}
		if(out != null){
			out.close();
		}
	}
}

public void f_ScannerPrintWriter(){

Scanner in = null;

PrintWriter out = null;

try{

in = new Scanner(new BufferedReader(new FileReader("C:\\a.txt")));

out = new PrintWriter(new BufferedWriter(new FileWriter("C:\\b.txt")));

String c;

int n = 0;

while(in.hasNext()){

c = in.nextLine();

out.println(c);

n++;

}

System.out.println("ScannerPrintWriter : " + n);

}

catch(Exception e){

System.out.println("error");

}

finally{

if(in != null){

in.close();

}

if(out != null){

out.close();

}

DataInputStream/DataOutputStream

public void f_DataInOutStream() throws IOException{
	DataInputStream in = null;
	DataOutputStream out = null;

	try{
		out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream("C:\\b.txt")));
		out.writeDouble(3.1415);
		out.writeInt(100);
		out.writeUTF("전주대학교");
		out.flush();

		in = new DataInputStream(new BufferedInputStream(new FileInputStream("C:\\b.txt")));
		System.out.println(in.readDouble());
		System.out.println(in.readInt());
		System.out.println(in.readUTF());
	}
	catch(Exception e){
		System.out.println("error");
	}
	finally{
		if(in != null){
			in.close();
		}
		if(out != null){
			out.close();
		}
	}
}

public void f_DataInOutStream() throws IOException{

DataInputStream in = null;

DataOutputStream out = null;

try{

out = new DataOutputStream(new BufferedOutputStream(new FileOutputStream("C:\\b.txt")));

out.writeDouble(3.1415);

out.writeInt(100);

out.writeUTF("전주대학교");

out.flush();

in = new DataInputStream(new BufferedInputStream(new FileInputStream("C:\\b.txt")));

System.out.println(in.readDouble());

System.out.println(in.readInt());

System.out.println(in.readUTF());

}

catch(Exception e){

System.out.println("error");

}

finally{

if(in != null){

in.close();

}

if(out != null){

out.close();

}

ObjectInputStream/ObjectOutputStream

public void f_ObjectInOutStream() throws IOException{
	ObjectInputStream in = null;
	ObjectOutputStream out = null;

	try{
		out = new ObjectOutputStream(new BufferedOutputStream(new FileOutputStream("C:\\b.txt")));
		out.writeObject(new Date());
		out.flush();

		in = new ObjectInputStream(new BufferedInputStream(new FileInputStream("C:\\b.txt")));
		Date d = (Date)in.readObject();
		System.out.println(d);
	}
	catch(Exception e){
		System.out.println("error");
	}
	finally{
		if(in != null){
			in.close();
		}
		if(out != null){
			out.close();
		}
	}
}

public void f_ObjectInOutStream() throws IOException{

ObjectInputStream in = null;

ObjectOutputStream out = null;

try{

out = new ObjectOutputStream(new BufferedOutputStream(new FileOutputStream("C:\\b.txt")));

out.writeObject(new Date());

out.flush();

in = new ObjectInputStream(new BufferedInputStream(new FileInputStream("C:\\b.txt")));

Date d = (Date)in.readObject();

System.out.println(d);

}

catch(Exception e){

System.out.println("error");

}

finally{

if(in != null){

in.close();

}

if(out != null){

out.close();

}

File

public void f_FileInfo(){
	//읽을 파일 이름 지정
	String fname = "C:\\a.txt";
	//File 객체 생성
	File f = new File(fname);
	System.out.println("파일 " + f.getName() + " 정보:");
	System.out.println();
	System.out.println("\t패스: " + f.getPath());
	System.out.println("\t절대패스: " + f.getAbsolutePath());
	System.out.println("\t부모: " + f.getParent());
	System.out.println("\t쓰기여부: " + f.canWrite());
	System.out.println("\t읽기여부: " + f.canRead());
	System.out.println("\t파일여부: " + f.isFile());
	System.out.println("\t폴더여부: " + f.isDirectory());
	System.out.println("\t수정일: " + new Date(f.lastModified()));
	System.out.println("\t파일크기: " + f.length());
}

public void f_FileInfo(){

//읽을 파일 이름 지정

String fname = "C:\\a.txt";

//File 객체 생성

File f = new File(fname);

System.out.println("파일 " + f.getName() + " 정보:");

System.out.println();

System.out.println("\t패스: " + f.getPath());

System.out.println("\t절대패스: " + f.getAbsolutePath());

System.out.println("\t부모: " + f.getParent());

System.out.println("\t쓰기여부: " + f.canWrite());

System.out.println("\t읽기여부: " + f.canRead());

System.out.println("\t파일여부: " + f.isFile());

System.out.println("\t폴더여부: " + f.isDirectory());

System.out.println("\t수정일: " + new Date(f.lastModified()));

System.out.println("\t파일크기: " + f.length());

}

whan0623

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