import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;

public class Lmt01 {

	public static void main(String[] args) {

		// 字元流讀取資料
		try {
			File file = new File("Text.txt");
			FileInputStream fileInputStream = new FileInputStream(file);
			InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream, "GBK");// 將位元組流轉換成字元流
			char inputChar[] = new char[99];
			int l = 0;
			while ((l = inputStreamReader.read(inputChar)) != -1) {
				String inputString = new String(inputChar, 0, l);
				System.out.println(inputString);// 自動呼叫inputChar.toString();
			}
			/*
			 * int l = 0; while ((l = inputStreamReader.read(inputChar)) != -1){
			 *  System.out.println(new String(inputChar, 0, l));//防止輸出檔案末尾的冗餘量
			 * }
			 */
			inputStreamReader.close();
			fileInputStream.close();

		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

		// 使用字元流寫資料，實現檔案拷貝
		try {
			FileInputStream fileInputStream = new FileInputStream("Text.txt");
			InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream, "GBK");
			FileOutputStream fileOutputStream = new FileOutputStream("Copy_Text.txt");
			OutputStreamWriter outputStreamWriter = new OutputStreamWriter(fileOutputStream, "GBK");
			char input[] = new char[99];
			int l = 0;

			while ((l = inputStreamReader.read(input)) != -1) {
				String inputString = new String(input, 0, l);
				outputStreamWriter.write(inputString);
			}
			/*
			 * while ((l = inputStreamReader.read(input)) != -1) {
			 * outputStreamWriter.write(input,0,l); }
			 */

			outputStreamWriter.close();
			fileOutputStream.close();
			inputStreamReader.close();
			fileInputStream.close();

		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

}
 

4、使用帶有緩衝的字元流讀寫資料