字节流 文件字节流 缓冲字节流

图片为二进制文件，采用字节流调取，实现图片的拷贝;

package io;

/**
 * file类的基本用法
 */
import java.io.*;

public class test {
    public static void main(String[] args) {
        FileInputStream fis = null;// 输入流
        FileOutputStream fos = null;// 输出流
        try {
            fis = new FileInputStream("D:\txt\qq.jpg");
            fos = new FileOutputStream("D:\txt\hello\qq.jpg");
            byte buf[] = new byte[1024];
            int n = 0;
            while ((n = fis.read(buf)) != -1) {
                fos.write(buf);
            }

        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        } finally {
            try {
                fis.close();
                fos.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

文件字符流，FileReader  Filewrite

读取一个文件并写入另一个文件中，char转

package io;

/**
 * file类的基本用法
 */
import java.io.*;

public class test {
    public static void main(String[] args) {
        FileReader fis = null;// 输入流
        FileWriter fos = null;// 输出流
        try {
            fis = new FileReader("D:\txt\test1.txt");
            fos = new FileWriter("D:\txt\hello\test1.txt");
            char buf[] = new char[1024];
            int n = 0;
            while ((n = fis.read(buf)) != -1) {
                String s = new String(buf);
                System.out.println(s);
                fos.write(buf);
            }

        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        } finally {
            try {
                fis.close();
                fos.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}

缓冲字符流 BufferedReader BufferWriter

package io;

/**
 * file类的基本用法
 */
import java.io.*;

public class test {
    public static void main(String[] args) {
        BufferedReader br = null;// 输入流
        BufferedWriter bw = null;// 输出流
        try {
            FileReader fr = new FileReader("D:\txt\test1.txt");
            br = new BufferedReader(fr);
            FileWriter fw = new FileWriter("D:\txt\hello\test2.txt");
            bw = new BufferedWriter(fw);
            String s = "";
            while ((s = br.readLine()) != null) {
                System.out.println(s);
                bw.write(s + "
");
            }

        } catch (Exception e) {
            // TODO: handle exception
            e.printStackTrace();
        } finally {
            try {
                br.close();
                bw.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
}