bufferdeoutputwriter
程序代码：public class BufferedReader_demo01 {
public static void main(String[] args) {
File file = new File("C:\\Users\\郭赛\\Desktop\\demo03.txt");
FileInputStream fis = null;
InputStreamReader inputStreamReader = null;
BufferedReader bufferedReader = null;
FileOutputStream fos = null;
OutputStreamWriter osr = null;
try {
/**
* 建立字节流和字符流的关系
*/
fis = new FileInputStream(file);
inputStreamReader = new InputStreamReader(fis);
fos = new FileOutputStream(new File("C:\\Users\\郭赛\\Desktop\\demo04.txt"));
osr = new OutputStreamWriter(fos);
char[] bytes = new char[1024];
int a;
while((a = inputStreamReader.read(bytes)) != -1)
osr.write(bytes,0,a);
bufferedReader = new BufferedReader(inputStreamReader);
String encoding = inputStreamReader.getEncoding();
System.out.println(encoding);
String s;
while ((s = bufferedReader.readLine()) != null)
System.out.println(s);
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if(bufferedReader == null)
bufferedReader.close();
} catch (IOException e) {
e.printStackTrace();
}
try {
if(inputStreamReader == null)
inputStreamReader.close();
} catch (IOException e) {
e.printStackTrace();
}
try {
if(fis == null)
fis.close();
} catch (IOException e) {
e.printStackTrace();
}
try {
if(osr == null)
osr.close();
} catch (IOException e) {
e.printStackTrace();
}
try {
if(fos == null)
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
为什么每次使用这个方法 while((a = inputStreamReader.read(bytes)) != -1)
osr.write(bytes,0,a);
文件中的内容就会消失
