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1、获取文件的最后修改时间
@SuppressLint("SimpleDateFormat") public String getFileDataTime(File file) { Date date = new Date(file.lastModified()); SimpleDateFormat sdformat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");// 24小时制 String LgTime = sdformat.format(date); return LgTime; }
@SuppressLint("SimpleDateFormat") public int compareDataTime(String date1, String date2) { java.text.DateFormat df = new java.text.SimpleDateFormat( "yyyy-MM-dd HH:mm:ss"); java.util.Calendar c1 = java.util.Calendar.getInstance(); java.util.Calendar c2 = java.util.Calendar.getInstance(); try { c1.setTime(df.parse(date1)); c2.setTime(df.parse(date2)); } catch (java.text.ParseException e) { System.err.println("error"); } int result = c1.compareTo(c2); if (result == 0) System.out.println("c1==c2"); else if (result < 0) System.out.println("c1<c2"); else System.out.println("c1>c2"); return result; }
public String[] compareStringPre(String[] Source, String[] Object) { String[] result; if (Source.length >= Object.length) { result = new String[Source.length]; } else { result = new String[Object.length]; } int n = 0; for (int i = 0; i < Object.length; i++) { boolean flag = false; for (int j = 0; j < Source.length; j++) { if (Object[i].equals(Source[j])) { flag = true; } } if (!flag) { result[n] = Object[i]; n++; } } return result; }
private boolean saveCrash(String crash) { String fileName = "cache.txt"; try { File file = new File(mstrFilePath, fileName); FileOutputStream fos = new FileOutputStream(file); fos.write(crash.toString().getBytes()); fos.close(); } catch (Exception e) { return false; } return true; }
public String readCrashData() { String strDataLine = ""; String filePath = mstrFilePath + "/cache.txt"; File file = new File(filePath); if (file.exists() == false) return strDataLine; long fileSize = file.length(); // 文件大于1M, 认为是无效数据, 直接删除 if (fileSize >= 1 * 1024 * 1024) { file.delete(); return strDataLine; } if (file.canRead() == false) return strDataLine; try { FileInputStream in = new FileInputStream(file); BufferedReader reader = new BufferedReader( new InputStreamReader(in)); strDataLine = reader.readLine(); reader.close(); } catch (FileNotFoundException e) { e.printStackTrace(); return strDataLine; } catch (IOException e) { e.printStackTrace(); return strDataLine; } return strDataLine; }
在上一篇中讲了android 文件android 使用AsyncHttpClient框架上传文件以及使用HttpURLConnection下载文件
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原文地址:http://blog.csdn.net/qq_16064871/article/details/51204582