Byte stream and character stream of IO
What's the difference between byte stream and character stream?
Byte stream transmission of any data, picture, video, text, etc
Character stream can only process plain text (character stream is also recommended for plain text)

Computer is the same Oh, so do not use the character stream to deal with non character files.
Because this article is just the beginning of IO, let's start with a brief introduction

1. thought

Four points to grasp the theme
//1 select source
//2 selection flow
//3 operation
//4 release resources

2. code

Byte stream

package IO;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
//1 source of choice 
//2 choice flow
//3 operation 
// 4 release resources
public class Standard file byte stream {
public static void main(String[] args) {
	//Standard file byte stream f= new Standard file byte stream();
	f.out();
}
public void read() {//Byte file read stream
	//Selection source
		File file = new File("king.txt");
		//Selection flow
		InputStream in= null;
		try {
		in = new FileInputStream(file);
			
		//Operation (segment read)
			byte [] flush =new byte [128];//Buffer container
			int len = -1;//Receiving container
			while((len = in.read(flush))!=-1) {
				 String str=new String(flush,0,len);//Byte array -- > string decoding
				 System.out.println(str);
			}
			
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {//Release resources
			
			if(null!=in) {
				try {
					in.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
		
		
	}
public void out() {
	//Selection source
	File file  =new File("king.txt");
	//Selection flow
	OutputStream output =null;
	try {
		output = new FileOutputStream(file ,true);
		//operation
		String s ="Here I am again.";
		byte [] n=s.getBytes();//Code
		output.write(n, 0, n.length);
		output.flush();//Refresh
	} catch (FileNotFoundException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	} catch (IOException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}finally {//Closed flow
		if(null!=output) {
			try {
				output.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	
}
}

Copy of byte stream file

package IO;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class Copies of documents {
public static void main(String[] args) {
	//Copy of file f = new  Copies of documents();
	f.copy("1.jpg", "Documents tested.jpg");
}
public void copy(String srcpath,String destpath) {
	//Selection source
	//File file1  =new File("1.jpg");
	//File file2  =new File("copy.jpg");
	File file1  =new File(srcpath);
	File file2  =new File(destpath);
	//Selection flow
	InputStream in =null;
	OutputStream out = null;
	try {
		in=new FileInputStream(file1);
		out =new FileOutputStream(file2);
		//operation
		byte [] flush = new byte [1024];
		int len =-1;
		while((len=in.read(flush))!=-1) {
			out.write(flush, 0, flush.length);
		}
	} catch (FileNotFoundException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	} catch (IOException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	//Release resources
	try {
		if(null!=out) {
			out.close();
		}
	} catch (Exception e) {
		// TODO: handle exception
	}
	try {
		if(null!=in) {
			in.close();
		}
	} catch (Exception e) {
		// TODO: handle exception
	}
}
}

Character stream

package IO;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.Reader;
import java.io.Writer;

public class File character input / output stream {
public static void main(String[] args) {
	//File character I / O stream f= new File character input / output stream();
	f.out();
}
public void in() {
	//Selection source
		File file  = new File("king.txt");
		//Selection flow
		Reader read=null;
		 try {
			read=new FileReader(file);
			char [] flush = new char [128];
			int len =-1;
			while((len=read.read(flush))!=-1) {
				System.out.println(flush);
			}
			//operation
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {//Release resources
			if(null!=read) {
				try {
					read.close();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
		
		
	}
 public void out() {
	 File file =new File("File character stream test.txt")	;
	 Writer write =null;
	 try {
		write=new FileWriter(file);
		String test ="I really don't want to play";
		char [] flush =test.toCharArray();//String - > array
		write.write(flush, 0,flush.length);
		
	} catch (IOException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}finally {
		if(null!=write) {
			try {
				write.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
 }
}