【Android】文件读写操作（含SDCard的读写）

public void saveAppend(String filename, String content) throws Exception
{
FileOutputStream outStream = this.openFileOutput(filename, Context.MODE_APPEND);
outStream.write(content.getBytes());
outStream.close();
}

public String readFile(String filename) throws Exception
{
//获得输入流
FileInputStream inStream = this.openFileInput(filename);
//new一个缓冲区
byte[] buffer = new byte[1024];
int len = 0;
//使用ByteArrayOutputStream类来处理输出流
ByteArrayOutputStream outStream = new ByteArrayOutputStream();
while( (len = inStream.read(buffer))!= -1)
{
//写入数据
outStream.write(buffer, 0, len);
}
//得到文件的二进制数据
byte[] data = outStream.toByteArray();
//关闭流
outStream.close();
inStream.close();
return new String(data);
}