Java 文件写入

fileWrite's time----------36
  outputStreamTest's time----------167
  bufferedOutputTest's time----------17
  bufferedWriteTest's time----------14
  bufferedWrite And FileWriterTest's time----------9
  bufferedWrite And BufferedOutputStreamTest's time----------12



/**
  *1 按字节写入 FileOutputStream
  *
  * @param count 写入循环次数
  * @param str 写入字符串
  */
public void outputStreamTest(int count, String str) {
  File f = new File("f:test1.txt");
  OutputStream os = null;
  try {
   os = new FileOutputStream(f);
   for (int i = 0; i < count; i++) {
    os.write(str.getBytes());
   }
   os.flush();
   System.out.println("file's long:" + f.length());
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  } finally {
   try {
    os.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
}





/**
  *2 按字节缓冲写入 BufferedOutputStream
  *
  * @param count 写入循环次数
  * @param str 写入字符串
  */
public void bufferedOutputTest(int count, String str) {
  File f = new File("f:test2.txt");
  BufferedOutputStream bos = null;
  try {
   OutputStream os = new FileOutputStream(f);
   bos = new BufferedOutputStream(os);
   for (int i = 0; i < count; i++) {
    bos.write(str.getBytes());
   }
   bos.flush();
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  } finally {
   try {
    bos.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
}



/**
  *3 按字符写入 FileWriter
  *
  * @param count 写入循环次数
  * @param str 写入字符串
  */
public void fileWriteTest(int count, String str) {
  File f = new File("f:test.txt");
  Writer writer = null;
  try {
   writer = new FileWriter(f);
   for (int i = 0; i < count; i++) {
    writer.write(str);
   }
   writer.flush();
  } catch (IOException e) {
   e.printStackTrace();
  } finally {
   try {
    writer.close();
   } catch (Exception e) {
    e.printStackTrace();
   }
  }
}



/**
  *4 按字符缓冲写入 BufferedWriter
  *
  * @param count 写入循环次数
  * @param str 写入字符串
  */
public void bufferedWriteTest(int count, String str) {
  File f = new File("f:test3.txt");
  OutputStreamWriter writer = null;
  BufferedWriter bw = null;
  try {
   OutputStream os = new FileOutputStream(f);
   writer = new OutputStreamWriter(os);
   bw = new BufferedWriter(writer);
   for (int i = 0; i < count; i++) {
    bw.write(str);
   }
   bw.flush();
   if(f.exists()){
    f.delete();
   }
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  } finally {
   try {
    bw.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
}




/**
  *5 按字符缓冲写入 BufferedWriter and BufferedOutputStream
  *
  * @param count 写入循环次数
  * @param str 写入字符串
  */
public void bufferedWriteAndBufferedOutputStreamTest(int count, String str) {
  File f = new File("f:test4.txt");
  BufferedOutputStream bos=null;
  OutputStreamWriter writer = null;
  BufferedWriter bw = null;
  try {
   OutputStream os = new FileOutputStream(f);
   bos=new BufferedOutputStream(os);
   writer = new OutputStreamWriter(bos);
   bw = new BufferedWriter(writer);
   for (int i = 0; i < count; i++) {
    bw.write(str);
   }
   bw.flush();
   if(f.exists()){
    f.delete();
    System.out.println("delete---");
   }
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  } finally {
   try {
    bw.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
}



/**
  *6 按字符缓冲写入 BufferedWriter and FileWriter
  *
  * @param count 写入循环次数
  * @param str 写入字符串
  */
public void bufferedWriteAndFileWriterTest(int count, String str) {
  File f = new File("f:test5.txt");
  FileWriter fw=null;
  BufferedWriter bw = null;
  try {
   fw=new FileWriter(f);
   bw = new BufferedWriter(fw);
   for (int i = 0; i < count; i++) {
    bw.write(str);
   }
   bw.flush();
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  } finally {
   try {
    bw.close();
    if(f.exists()){
     f.delete();
    }
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
}

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