android创建txt文件,读取txt文件内容
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2022-05-31 10:41:37
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1.android在sd卡上创建一个txt文件,并且写入内容:
public static boolean saveTxt(String phoneNumber,Context context,String path){ //sd卡检测 String sdStatus = Environment.getExternalStorageState(); if(!sdStatus.equals(Environment.MEDIA_MOUNTED)){ Toast.makeText(context, "SD 卡不可用", Toast.LENGTH_SHORT).show(); return false; } //检测文件夹是否存在 File file = new File(path); file.exists(); file.mkdirs(); String p = path+File.separator+"1.txt"; FileOutputStream outputStream = null; try { //创建文件,并写入内容 outputStream = new FileOutputStream(new File(p)); String msg = new String(phoneNumber); outputStream.write(msg.getBytes("UTF-8")); } catch (FileNotFoundException e) { e.printStackTrace(); return false; } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); }finally{ if(outputStream!=null){ try { outputStream.flush(); } catch (IOException e) { e.printStackTrace(); } try { outputStream.close(); } catch (IOException e) { e.printStackTrace(); } } } return true; }
2.读取txt内容
public static String readPhoneNumber(String path){ byte Buffer[] = new byte[1024]; //得到文件输入流 File file = new File(path+File.separator+"1.txt"); FileInputStream in = null; ByteArrayOutputStream outputStream = null; try { in = new FileInputStream(file); //读出来的数据首先放入缓冲区,满了之后再写到字符输出流中 int len = in.read(Buffer); //创建一个字节数组输出流 outputStream = new ByteArrayOutputStream(); outputStream.write(Buffer,0,len); //把字节输出流转String return new String(outputStream.toByteArray()); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); }finally{ if(in!=null){ try { in.close(); } catch (IOException e) { e.printStackTrace(); } } if(outputStream!=null){ try { outputStream.flush(); outputStream.close(); } catch (IOException e) { e.printStackTrace(); } } } return null; }
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