Today met a new demand from the server when you open the downloaded file with the specified local program, do not know when the file download is complete, the listener can only consider folder, when there is a new file is created to open the specified program.
In this gives a complete download and open process:
1. Download the file
jsp page
1 <body> 2 <div> 3 <a href="<%=basePath%>/user/downLoadFile?fileName=proPlan.DWG" >点击下载</a> 4 </div> 5 </body>
java code
1 public static void downLoadtFile(HttpServletResponse response, File file) throws IOException 2 { 3 response.reset(); 4 response.setContentType("application/vnd.ms-excel;charset=UTF-8"); 5 response.setHeader("Content-disposition", 6 "attachment; filename=" + new String(file.getName().getBytes(), "iso-8859-1")); 7 OutputStream outputStream = response.getOutputStream(); 8 InputStream in = new FileInputStream(file); 9 byte[] b = new byte[1024]; 10 int len = 0; 11 while ((len = in.read(b)) > 0) 12 { 13 outputStream.write(b, 0, len); 14 } 15 outputStream.write(b); 16 outputStream.flush(); 17 in.close(); 18 }
2, monitor folder, open the program execution
1 package demo; 2 3 import java.io.IOException; 4 import java.nio.file.FileSystems; 5 import java.nio.file.Path; 6 import java.nio.file.Paths; 7 import java.nio.file.StandardWatchEventKinds; 8 import java.nio.file.WatchEvent; 9 import java.nio.file.WatchKey; 10 import java.nio.file.WatchService; 11 import java.util.List; 12 import java.util.concurrent.ExecutorService; 13 import java.util.concurrent.Executors; 14 15 public class FolderListener { 16 private static ExecutorService fixedThreadPool = Executors.newCachedThreadPool(); 17 private WatchService ws; 18 private String listenerPath; 19 private FolderListener(String path) { 20 try { 21 ws = FileSystems.getDefault().newWatchService(); 22 this.listenerPath = path; 23 start(); 24 } catch (IOException e) { 25 e.printStackTrace(); 26 } 27 } 28 29 private void start() { 30 fixedThreadPool.execute(new Listner(ws,this.listenerPath)); 31 } 32 33 public static void addListener(String path) throws IOException { 34 FolderListener resourceListener = new FolderListener(path); 35 Path p = Paths.get(path); 36 //Event listener registration, file edit, delete and create 37 [ p.register (resourceListener.ws, 38 is StandardWatchEventKinds.ENTRY_MODIFY, 39 StandardWatchEventKinds.ENTRY_DELETE, 40 StandardWatchEventKinds.ENTRY_CREATE); 41 is } 42 is 43 is 44 is public static void main (String [] args ) throws IOException { 45 // change listener download directory 46 is FolderListener.addListener ( "C: \\ Downloads the Users \\ \\ \\ Administrator" ); 47 } 48 } 49 50 class Listnerimplements Runnable { 51 private WatchService service; 52 private String rootPath; 53 54 public Listner(WatchService service,String rootPath) { 55 this.service = service; 56 this.rootPath = rootPath; 57 } 58 59 public void run() { 60 try { 61 while(true){ 62 WatchKey watchKey = service.take(); 63 List <WatchEvent <>> watchEvents =? WatchKey.pollEvents (); 64 for (WatchEvent <>? Event: watchEvents) { 65 IF (.. Event.context () toString () endsWith (. "The DWG" )) 66 / / take different actions depending on the type of event. . . . . . . 67 the try { 68 System.out.println ( "[" + rootPath + event.context () + "] files have [" + event.kind () + " ] event" + event.count ()); 69 String [] = {cmd "D: \\ \\ the acad.exe the AutoCAD CAD \\", "C: \\ Downloads the Users \\ \\ \\ Administrator" + . event.context () toString ()}; 70 the Runtime . getRuntime () exec (CMD). 71 } catch (IOException e) { 72 e.printStackTrace(); 73 } 74 } 75 watchKey.reset(); 76 } 77 } catch (InterruptedException e) { 78 e.printStackTrace(); 79 }finally{ 80 System.out.println("fdsfsdf"); 81 try { 82 service.close(); 83 } catch(IOException e) { 84 e.printStackTrace (); 85 } 86 } 87 88 } 89 }
Supplement, in addition to performing the specified exe, open external software can also perform a command line
1 package demo; 2 3 import java.io.BufferedReader; 4 import java.io.InputStream; 5 import java.io.InputStreamReader; 6 7 public class Command { 8 9 public static void main(String[] args) { 10 String s = exeCmd("ipconfig"); 11 System.out.println(s); 12 } 13 14 public static String exeCmd(String commandStr) { 15 BufferedReader br = null; 16 StringBuilder sb = new StringBuilder(); 17 try { 18 Process p = Runtime.getRuntime().exec(commandStr); 19 br = new BufferedReader(new InputStreamReader(p.getInputStream(), "gb2312")); 20 // InputStream in = p.getInputStream(); 21 // byte[] b = new byte[1024]; 22 // int len = 0; 23 // while((len = in.read(b)) > 0){ 24 // sb.append(new String(b,"gb2312")).append("\n"); 25 // } 26 String line = null; 27 while ((line = br.readLine()) != null) { 28 sb.append(line).append("\n"); 29 } 30 } catch (Exception e) { 31 e.printStackTrace(); 32 } 33 finally 34 { 35 if (br != null) 36 { 37 try { 38 br.close(); 39 } catch (Exception e) { 40 e.printStackTrace(); 41 } 42 } 43 } 44 return sb.toString(); 45 } 46 }