IO stream, character read / write, copy

Character reading

package io;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.nio.CharBuffer;

/** 
* @author : htf 
*  Character reading 
*/
public class TestReader {
	
	
	// A character      One character    read 
	public static void test() {
		File file=new File("E:\\temp\\a.txt");
		FileReader fr=null;
		try {
			fr=new FileReader(file);
			int c=fr.read();
			 c=fr.read();
			 c=fr.read();
			 c=fr.read();
			 c=fr.read();
			 c=fr.read();
			 System.out.println();
		} catch (Exception e) {
			e.printStackTrace();
		}finally {
			try {
				fr.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		
	}
	// Traversal read 
	public static void test1() {
		File file=new File("E:\\temp\\a.txt");
		FileReader fr=null;
		try {
			fr=new FileReader(file);
			int a=0;
			while((a=fr.read())!=-1) {
				System.out.println((char)a);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}finally {
			try {
				fr.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	// Enable cache read 
	public static void test2() {
		File file=new File("E:\\temp\\a.txt");
		FileReader fr=null;
		try {
			fr=new FileReader(file);
			int a=0;
			char[] b=new char[3];// Each read 3 Characters 
			// Use FileReader Medium read The method parameter is an array , Each read 3 Characters , The return value is -1 when , Read complete 
			while((a=fr.read(b))!=-1) {
				System.out.println(new String(b, 0, a));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}finally {
			try {
				fr.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		
	}
	public static void main(String[] args) {
		//test();
		//test1();
		test2();
	}
}

Character writing Copy

package io;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

/** 
* @author : htf 
*  Character writing and file copying 
* 
*/
public class TestWriter {

	// Read a , Write a   inefficiency 
	public static void test1() {
		File src =new File("E:\\temp\\a.txt");
		File dest=new File("E:\\temp\\a5.txt");
		
		FileReader fr = null;
		FileWriter fw = null;
		try {
			fr=new FileReader(src);
			fw=new FileWriter(dest);
			
			 int a=fr.read();
			 fw.write(a);
			 a=fr.read();
			 fw.write(a);
			 a=fr.read();
			 fw.write(a);
			 a=fr.read();
			 fw.write(a);
			 a=fr.read();
			 fw.write(a);
			 fw.flush();// Refresh 
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
			try {
				fw.close();
				fr.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	
	// Read a group , Write a group 
	public static void test2() {
		File src =new File("E:\\temp\\a.txt");
		File dest=new File("E:\\temp\\a6.txt");
		
		FileReader fr = null;
		FileWriter fw = null;
		try {
			fr=new FileReader(src);
			fw=new FileWriter(dest);
			char b[]=new char[3];// Read three characters at a time 
			int a=0;
			while(( a=fr.read(b))!=-1) {
				fw.write(b,0,a);// Write the data read each time into a6.txt,a, Number of characters written 
			}
			 fw.flush();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally {
			try {
				fw.close();
				fr.close();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	public static void main(String[] args) {
		test2();
	}
}