java对文件的处理，遍历、下载、删除、移动等
APP上线良好，后台管理网站需要一个记录每天app运行日志的功能，有专门代码人员查看日志有哪些崩溃的地方，具体需求如下：
1、将服务器上文件夹里的日志文件显示到页面上，点击下载可通过浏览器将日志文件下载至本地进行查看。
注：为了安全考虑，需要减少对真实日志文件的操作，所以另外新建一个文件夹，将日志文件复制到新的文件夹下进行操作。
2、每天凌晨00：01分，将上一天的日志文件，复制到新的文件夹下，并且删除新文件夹下前6天的日志文件，一般来说，那些日志文件已经查看，没作用了，为了节省空间（洁癖）。
一、将磁盘的文件显示到页面上
1 /** 2 * 运行日志列表 3 * 4 * @user Anear 5 * @time 17:24 6 */ 7 @RequestMapping("/getCatalinaLog") 8 public String getCatalinaLog(AppUserLog appUserLog, String pageNo, 9 HttpServletRequest request, HttpServletResponse response,ModelMap model) { 10 List<LogLife> logNameList = new ArrayList<LogLife>(); 11 String filePath = "E:/log_file";//待修改路径 日志文件夹路径 12 File f = new File(filePath); 13 if (!f.exists()) { 14 System.out.println(filePath + " not exists"); 15 return "appUser/catalinaLog"; 16 } 17 18 File fa[] = f.listFiles(); 19 20 21 /* for (File file : fa) { 22 life.setLogName(file.getName()); 23 logNameList.add(life); 24 }*/ 25 26 for (int i = 0; i < fa.length; i++) { 27 LogLife life = new LogLife(); 28 life.setLogName(""); 29 File fs = fa[i]; 30 if (fs.isDirectory()) { 31 // System.out.println(fs.getName() + " [目录]"); 32 } else { 33 // System.out.println(fs.getName()); 34 life.setLogName(fs.getName()); 35 life.setUrl(fs.getName()); 36 logNameList.add(life); 37 } 38 } 39 PageList<LogLife> lPageList = new PageList<LogLife>(); 40 lPageList.setRecords(logNameList); 41 42 model.put("logName", logNameList); 43 model.put("pageList", lPageList); 44 model.put("appUserLog", appUserLog); 45 return "appUser/catalinaLog"; 46 }
1 public class LogLife { 2 private String logName;//文件名称 3 private String url;// 请求的路径 4 private String filePath;//文件将要保存的目录 5 private String method;//方法 post or get 6 ｝
二、将显示的日志下载到本地
1 /** 2 * 下载日志 3 * https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superman/img/logo/bd_logo1_31bdc765.png 4 * @throws IOException 5 * @user Anear 6 * @time 17:24 7 */ 8 @RequestMapping("/downloadingLog") 9 public void downloadingLog(AppUserLog appUserLog,String fileName_downLoad, String pageNo, 10 HttpServletRequest request, HttpServletResponse response,ModelMap model) throws IOException { 11 //String apkPath=YmWebAppConfig.getSYSTEM_FILE_SOURSE().concat(YmWebAppConfig.getUpdateAppAndroidDir()).concat("/"+appInfo.getApkName()); 12 String apkPath = "E:/log_file"+"/"+fileName_downLoad;//待修改路径 指定日志文件路径 下载 13 File apk=new File(apkPath); 14 if(apk.exists() && apk.isFile()){ 15 String fileName=apk.getName(); 16 response.reset(); 17 response.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\""); 18 response.addHeader("Content-Length", "" + apk.length()); 19 response.setContentType("application/octet-stream;charset=UTF-8"); 20 InputStream inputStream=new FileInputStream(apk); 21 byte[] b=new byte[inputStream.available()]; 22 inputStream.read(b); 23 OutputStream outputStream = new BufferedOutputStream(response.getOutputStream()); 24 outputStream.write(b); 25 outputStream.flush(); 26 outputStream.close(); 27 inputStream.close(); 28 }else{ 29 LogUtil.errorLog("浏览器下载，找不到源文件", log); 30 } 31 }
三、定时将服务器的日志文件，复制到新的文件夹下，并且删除6天前的废弃日志
1 <!-- 开启任务注解扫描 --> 2 <task:annotation-driven/> 3 <bean id="autoTransTask" class="com.***.***.controller.AutoTransImpl"/> 4 <task:scheduled-tasks> 5 <task:scheduled ref="autoTransTask" method="executeAutoTrans" cron="0 01 00 * * *"/> 6 </task:scheduled-tasks>
1 /** 2 * FileName: AutoTransImpl 3 * Author: Anear 4 * Date: 2017/5/7 5 * Description: 定时操作运行日志 6 */ 7 @Component("AutoTrans") 8 public class AutoTransImpl implements AutoTrans { 9 10 @Override 11 @Transactional(propagation = Propagation.REQUIRES_NEW) 12 public void executeAutoTrans() { 13 File directory = null; 14 Calendar cal = Calendar.getInstance(); 15 SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd"); 16 17 Object obj = "E:/oldlog"+"/";//老目标文件夹下所有文件 //待修改路径 指定日志文件路径 18 String url = "E:/newlog"+"/"; 19 20 String cal2 = getCalendar(1); 21 // System.out.println("前一天时间："+cal2); 22 23 if (obj instanceof File) { 24 directory = (File) obj; 25 } else { 26 directory = new File(obj.toString()); 27 } 28 ArrayList<File> files = new ArrayList<File>(); 29 if (directory.isFile()) { 30 files.add(directory); 31 } else if (directory.isDirectory()) { 32 File[] fileArr = directory.listFiles(); 33 for (File file : fileArr) { 34 long time = file.lastModified(); 35 cal.setTimeInMillis(time); 36 System.out.println(formatter.format(cal.getTime())); 37 if (formatter.format(cal.getTime()).equals(cal2)) {//如果文件修改时间为前一天 38 String oldPath = obj.toString()+file.getName(); //"D:/apache-tomcat-7.0.79/logs/localhost_access_log.2017-09-11.txt"; 39 String newPath = url+file.getName(); 40 // System.out.println("oldPath:"+oldPath+",,,,,newPath:"+newPath); 41 try { 42 int bytesum = 0; 43 int byteread = 0; 44 File oldfile = new File(oldPath); 45 if (oldfile.exists()) { //文件存在时 46 InputStream inStream = new FileInputStream(oldPath); //读入原文件 47 FileOutputStream fs = new FileOutputStream(newPath); 48 byte[] buffer = new byte[1444]; 49 int length; 50 while ( (byteread = inStream.read(buffer)) != -1) { 51 bytesum += byteread; //字节数 文件大小 52 // System.out.println(bytesum); 53 fs.write(buffer, 0, byteread); 54 } 55 inStream.close(); 56 } 57 } catch (Exception e) { 58 System.out.println("复制单个文件操作出错"); 59 e.printStackTrace(); 60 } 61 } 62 } 63 } 64 cal2 = getCalendar(6); 65 directory =new File(url+"info.log."+cal2); 66 if (directory.exists()) {//删除 67 directory.delete(); 68 } 69 70 71 } 72 //获取日期 73 public String getCalendar(int num){ 74 SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd"); 75 Calendar cal = Calendar.getInstance(); 76 int day = cal.get(Calendar.DATE); //当前时间的前一天 77 78 cal.set(Calendar.DATE, day-num); 79 // System.out.println(formatter.format(cal.getTime())); 80 return formatter.format(cal.getTime()); 81 } 82 }
