try {
FileInputStream fis=new FileInputStream("test.txt");
int n=fis.read(); //输入流中读取一个数据字节
Log.i("test",(char)n+"---");
while (n!=-1){
Log.i("test",(char)n+"---");
n=fis.read();
}
fis.close();
} catch (Exception e) {
e.printStackTrace();
}
try {
FileInputStream fis1=new FileInputStream("test.txt");
byte[] bytes =new byte[100];
fis1.read(bytes); // 从输入流中将最多b.length哥字节的数据读入第一个byte数组中;
//fis1.read(bytes,0,6); //从输入流中将最多len个字节的数据读入byte数组中;
Log.i("test",new String(bytes)+"---");
fis1.close();
} catch (Exception e) {
e.printStackTrace();
}
try {
FileOutputStream fos=new FileOutputStream("test.txt",true); //true 写入追加
fos.write(50);
fos.write('a');
fos.close();
Log.i("test","---");
} catch (Exception e) {
e.printStackTrace();
}
// 文件拷贝
try {
FileInputStream fis=new FileInputStream("HAPPY.JPG");
FileOutputStream fos=new FileOutputStream("HAPPYCOPY.JPG");
int n=0;
byte[] b=new byte[1024];
while ((n=fis.read(b))!=-1){
fos.write(b);
fos.write(b,0,n); //保证两个文件大小相同
}
fis.close();
fos.close();
Log.i("test","---");
} catch (Exception e) {
e.printStackTrace();
}
// 缓冲流
try {
FileOutputStream fos=new FileOutputStream("test3.txt");
BufferedOutputStream bos=new BufferedOutputStream(fos);
bos.write(50);
bos.write('a');
bos.flush(); //缓冲区未满,不会主动清空
bos.close();
FileInputStream in=new FileInputStream("test.txt");
BufferedInputStream bis=new BufferedInputStream(in);
//byte[] b=new byte[1024];
bis.read();
Log.i("test",(char)bis.read()+"----");
bos.close();
bis.close();
in.close();
bis.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
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