您好,登錄后才能下訂單哦!
本文實(shí)例為大家分享了android實(shí)現(xiàn)文件讀寫功能的具體代碼,供大家參考,具體內(nèi)容如下
讀?。?/p>
public static String _getJsonString(String fileName) throws IOException { if ((fileName == null) || fileName.isEmpty()) { return ""; } String retString = ""; FileInputStream fis = null; String state = Environment.getExternalStorageState(); if (state.equals(Environment.MEDIA_MOUNTED)) { File file = new File(Environment.getExternalStorageDirectory() + "/" + fileName + ".json"); if (file.exists()) { fis = new FileInputStream(file); byte[] buffer = new byte[fis.available()]; fis.read(buffer); fis.close(); retString = new String(buffer); } else { } } return retString; }
寫:
public static void saveSettingFile(String fileName, String content) { FileOutputStream fos = null; String state = Environment.getExternalStorageState(); if (state.equals(Environment.MEDIA_MOUNTED)) { File file = new File(Environment.getExternalStorageDirectory() + "/" + fileName + ".json"); try { fos = new FileOutputStream(file); byte[] buffer = content.getBytes(); fos.write(buffer); fos.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } }
Gson 讀寫:
public static void saveServerInfo(String fileName, String content) { FileOutputStream fos = null; String state = Environment.getExternalStorageState(); if (state.equals(Environment.MEDIA_MOUNTED)) { File file = new File(Environment.getExternalStorageDirectory() + "/" + fileName + ".json"); try { fos = new FileOutputStream(file); byte[] buffer = content.getBytes(); fos.write(buffer); fos.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } } public static ServerInfo getServerInfo(String fileName) throws IOException { ServerInfo serverInfo = new ServerInfo(); if ((fileName == null) || fileName.isEmpty()) { serverInfo = null; return serverInfo; } FileInputStream fis = null; String state = Environment.getExternalStorageState(); if (state.equals(Environment.MEDIA_MOUNTED)) { File file = new File(Environment.getExternalStorageDirectory() + "/" + fileName + ".json"); if (file.exists()) { fis = new FileInputStream(file); byte[] buffer = new byte[fis.available()]; fis.read(buffer); fis.close(); Gson gson = new Gson(); serverInfo = gson.fromJson(new String(buffer), ServerInfo.class); } else { serverInfo = null; } } return serverInfo; }
調(diào)用:
public void onSetIPAndPort(View view) { ServerInfo serverInfo = new ServerInfo(); try { serverInfo = JsonFileWriteAndRead.getServerInfo("videochat"); } catch (IOException e) { e.printStackTrace(); } //寫入ip和端口 String ip = ipSet.getText().toString(); String port = portSet.getText().toString(); serverInfo.setIpString(ip); serverInfo.setPortString(port); Gson gson = new Gson(); if (ip.isEmpty() || port.isEmpty()) { Toast.makeText(this, "地址或端口為空", Toast.LENGTH_SHORT).show(); } else { JsonFileWriteAndRead.saveServerInfo("videochat", gson.toJson(serverInfo)); Toast.makeText(this, "地址和端口已經(jīng)寫入文件", Toast.LENGTH_SHORT).show(); } }
以上就是本文的全部內(nèi)容,希望對大家的學(xué)習(xí)有所幫助,也希望大家多多支持億速云。
免責(zé)聲明:本站發(fā)布的內(nèi)容(圖片、視頻和文字)以原創(chuàng)、轉(zhuǎn)載和分享為主,文章觀點(diǎn)不代表本網(wǎng)站立場,如果涉及侵權(quán)請聯(lián)系站長郵箱:is@yisu.com進(jìn)行舉報(bào),并提供相關(guān)證據(jù),一經(jīng)查實(shí),將立刻刪除涉嫌侵權(quán)內(nèi)容。