android 超轻量级数据存储类详解编程语言

/** * android本地存储 ，主要用于存储简单key value键值对。提供增、删、改、查方法。 可自定义路径 * @author Administrator public class LocalStorage { private static Properties properties = new Properties(); private static String filepath; private LocalStorage() { /** * @param ctx * @param fileName * 文件名 * @return public static LocalStorage get(Context ctx, String fileName) { return get(ctx.getCacheDir() + "/" + fileName); /** * @param filePath * 文件绝对路径 * @return public static LocalStorage get(String filePath) { createFile(filePath); filepath = filePath; try { properties.load(new FileInputStream(filepath)); return new LocalStorage(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); return null; private static void createFile(String fileName) { File file = new File(fileName); if (!file.exists()) { String path = file.getAbsolutePath(); String[] sourceStrArray = path.split("/"); String dirPath = ""; for (int i = 0; i sourceStrArray.length - 1; i++) { if (!sourceStrArray[i].equals("")) { dirPath += "/" + sourceStrArray[i]; new File(dirPath).mkdirs(); try { file.createNewFile(); } catch (IOException e) { e.printStackTrace(); public String getAsString(String key) { if (key == null) { return null; Properties props = new Properties(); try { props.load(new FileInputStream(filepath)); String value = props.getProperty(key); value = URLDecoder.decode(value, "utf-8"); return value; } catch (Exception e) { e.printStackTrace(); return null; public int getAsInt(String key) { String str = getAsString(key); if (str == null) return -9999; return Integer.valueOf(str).intValue(); public boolean getAsBoolean(String key) { String str = getAsString(key); if (str == null) return false; if (str.equals("true")) return true; return false; public long getAsLong(String key) { String str = getAsString(key); if (str == null) return -9999; return Long.valueOf(str).longValue(); public float getAsFloat(String key) { String str = getAsString(key); if (str == null) return -9999; return Float.valueOf(str).floatValue(); public double getAsDouble(String key) { String str = getAsString(key); if (str == null) return -9999; return Double.valueOf(str).doubleValue(); /** * 添加 * @param keyname * @param keyvalue public void put(String keyname, Object keyvalue) { // 处理中文乱码 String value = keyvalue.toString(); try { value = URLEncoder.encode(value, "utf-8"); } catch (UnsupportedEncodingException e1) { e1.printStackTrace(); try { OutputStream fos = new FileOutputStream(filepath); properties.setProperty(keyname, value); properties.store(fos, null); } catch (IOException e) { /** * 更新 * @param keyname * @param keyvalue public void update(String keyname, String keyvalue) { try { properties.load(new FileInputStream(filepath)); OutputStream fos = new FileOutputStream(filepath); properties.setProperty(keyname, keyvalue); properties.store(fos, null); } catch (IOException e) { /** * 根据key删除 * @param key public void delete(String key) { try { FileInputStream fis = new FileInputStream(filepath); properties.load(fis); Map String, String map = new HashMap String, String Set Object keySet = properties.keySet(); for (Object object : keySet) { String objectkey = (String) object; String value = (String) properties.get(objectkey); map.put(objectkey, value); map.remove(key); properties.remove(key); for (java.util.Map.Entry String, String entry : map.entrySet()) { properties.setProperty(entry.getKey(), entry.getValue()); FileOutputStream fos = new FileOutputStream(filepath); properties.store(fos, "delete key:" + key); fos.close(); fis.close(); } catch (Exception e) { e.printStackTrace(); }

使用方法

 // 这里获取LocalStorage对象。参数也可以为文件绝对路径，当然也可以直接传入Context和文件名。 

 LocalStorage localStorage = LocalStorage.get("test.txt"); 

 // 增加 

 localStorage.put("key", "哈哈"); 

 // 更新 

 localStorage.update("key", "value"); 

 // 查找，这里提供多个getAs 方法。取数据找到相应的数据类型 

 localStorage.getAsString("key"); 

 // 删除 

 localStorage.delete("key"); 

原创文章，作者：ItWorker，如若转载，请注明出处：https://blog.ytso.com/10637.html

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