IO stream character stream copy

 

 

 

1 Read file characters and print:

 

public class Demo01 {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		//create source
		File src =new File("E:/xp/test/a.txt");
		// select stream
		Reader reader =null;
		try {
			reader =new FileReader(src);
			// read operation
			char[] flush =new char[1024];
			int len ​​= 0;
			while(-1!=(len=reader.read(flush))){ //
				// convert character array to string
				String str =new String(flush,0,len);
				System.out.println(str);
			}
		} catch (FileNotFoundException e) {
			e.printStackTrace ();
			System.out.println("The source file does not exist");
		} catch (IOException e) {
			e.printStackTrace ();
			System.out.println("Failed to read file");
		}finally{
			try {
				if (null != reader) {
					reader.close();
				}
			} catch (Exception e2) {
			}
		}
	}

}

 

 

2 file copies:

 

public class CopyFileDemo {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		//Create plain text whose source is limited to characters
		File src =new File("E:/xp/test/Demo03.java");
		File dest =new File("e:/xp/test/char.txt");
		// select stream
		Reader reader =null;		
		Writer wr =null;
		try {
			reader =new FileReader(src);
			wr =new FileWriter(dest);
			// read operation
			char[] flush =new char[1024];
			int len ​​= 0;
			while(-1!=(len=reader.read(flush))){ // Note, read the data into the flush container
				wr.write(flush, 0, len);
			}
			wr.flush();//Force flush out
		} catch (FileNotFoundException e) {
			e.printStackTrace ();
			System.out.println("The source file does not exist");
		} catch (IOException e) {
			e.printStackTrace ();
			System.out.println("Failed to read file");
		}finally{
			try {
				if (null != wr) {
					wr.close();
				}
			} catch (Exception e2) {
			}
			try {
				if (null != reader) {
					reader.close();
				}
			} catch (Exception e2) {
			}
		}
	
	}

}