采用文件字符输入流和文件字符输出流把 Dwordatxt 复制到Ewordatxt分别采用一次读取一个字符的方式和一次读取一个字符数组的方式

一次读取一个字符的方式：

import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class FileCopyDemo {
    public static void main(String[] args) {
        FileReader reader = null;
        FileWriter writer = null;
        try {
            reader = new FileReader("D:\\word\\a.txt");
            writer = new FileWriter("E:\\word\\a.txt");
            int c;
            while ((c = reader.read()) != -1) {
                writer.write(c);
            }
            System.out.println("文件复制成功！");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (reader != null) {
                    reader.close();
                }
                if (writer != null) {
                    writer.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

一次读取一个字符数组的方式：

import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;

public class FileCopyDemo {
    public static void main(String[] args) {
        FileReader reader = null;
        FileWriter writer = null;
        try {
            reader = new FileReader("D:\\word\\a.txt");
            writer = new FileWriter("E:\\word\\a.txt");
            char[] buffer = new char[1024];
            int len;
            while ((len = reader.read(buffer)) != -1) {
                writer.write(buffer, 0, len);
            }
            System.out.println("文件复制成功！");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (reader != null) {
                    reader.close();
                }
                if (writer != null) {
                    writer.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}
``