IO流-输入输出流:字节流、字符流、缓冲流、转换流

FileInputStream fis = new FileInputStream(filePath); FileOutputStream fos = new FileOutputStream(savePath);  byte[] buffer = new byte[1024]; int length = 0; while (-1 != (length = fis.read(buffer))) {     fos.write(buffer);     /**     * 等价于下面的写法：     * String str = new String(buffer, 0, length);     * fos.write(str.getBytes());     */ } 

FileReader fr = new FileReader(fileName);  char[] buffer = new char[1024];//使用字符数组  int length = 0;  while (-1 != (length = fr.read(buffer)))  {      for (int i = 0; i < length; i++)      {          System.out.print(buffer[i]);      }  }    FileWriter fw = new FileWriter(fileName); fw.write("这段字符串按字符写入good"); fw.flush();//写完清空缓存 

FileInputStream fis = new FileInputStream(fileName); InputStreamReader isr = new InputStreamReader(fis); BufferedReader br = new BufferedReader(isr);  FileOutputStream fos = new FileOutputStream(saveName); OutputStreamWriter osw = new OutputStreamWriter(fos); BufferedWriter bw = new BufferedWriter(osw);   String str = null; while (null != (str = br.readLine()))//读取每行直到'\r'或'\t'则为空 {     bw.write(str);//write可以写入字符串或者字符     bw.newLine();//换行     bw.flush();//清空缓存 } 

public class CopyMethod {     public static void main(String[] args)     {         CopyMethod cm = new CopyMethod();         String scr = "F:/java/tt.txt";         String dest = "F:/java/xx.txt";         cm.copyMethod(scr, dest);     }          public void copyMethod(String scr,String dest)     {         BufferedReader fr = null;         BufferedWriter bw = null;         try         {             FileInputStream fis = new FileInputStream(scr);//文件输入流             InputStreamReader isr = new InputStreamReader(fis);//转换流，将字节流转换为字符流             fr = new BufferedReader(isr);//创建字符缓冲流，每次读取一行字符                          FileOutputStream fos = new FileOutputStream(dest);             OutputStreamWriter osw = new OutputStreamWriter(fos);             bw = new BufferedWriter(osw);                          String str = null;//缓冲流读取和写入的都是字符串             while(null != (str = fr.readLine()))//使用readLine()，读取到\r或\n结束             {                 bw.write(str);//写入一行字符串                 bw.newLine();//换行                 bw.flush();//清空缓存,使用writer需要flush             }         }         catch (FileNotFoundException e)         {             e.printStackTrace();         }         catch (IOException e)         {             e.printStackTrace();         }         finally//关闭最外层的流         {             if(fr != null)             {                 try                 {                     fr.close();                 }                 catch (IOException e)                 {                     e.printStackTrace();                 }             }             if(null != bw)             {                 try                 {                     bw.close();                 }                 catch (IOException e)                 {                     e.printStackTrace();                 }             }         }     } }