本文实例为大家分享了android实现文件读写功能的具体代码,供大家参考,具体内容如下
读取:
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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; } |
写:
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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 读写:
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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; } |
调用:
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public void onSetIPAndPort(View view) { ServerInfo serverInfo = new ServerInfo(); try { serverInfo = JsonFileWriteAndRead.getServerInfo( "videochat" ); } catch (IOException e) { e.printStackTrace(); } //写入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 , "地址或端口为空" , Toast.LENGTH_SHORT).show(); } else { JsonFileWriteAndRead.saveServerInfo( "videochat" , gson.toJson(serverInfo)); Toast.makeText( this , "地址和端口已经写入文件" , Toast.LENGTH_SHORT).show(); } } |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/cau_eric/article/details/90410761