File establishment / check and delete <% @ page contentty = "text / html; charset = GB2312"%> <% @ page import = "java.io. *"%>
file Establish, check and delete </ title> </ head> <body> <% string path = request.getRealPath (""); // out.println (path); file f = new file (path, "file.txt "); // out.println (f); // out.println (f.exists ());</p>
<p>IF (F.Exists ()) {// Check if file.txt exists in f.delete (); // Delete file.txt file out.println (Path "//file.txt exists, deleted."); } else {f.createNewFile (); // Create a file named file.txt in the current directory Out.println (Path "//file.txt does not exist,"); // Output is currently Directory path}%></p>
<p>Contents of the catalog / check and deletion</p>
<p><% @ Page ContentType = "Text / HTML; Charset = GB2312"%> <% @ page import = "java.io. *"%> <html> <head> <title> directory creation / check and deletion </ Title> </ head> <body> <% string path = request.getRealPath (""); path = path "// Sub"; // will be created directory path file d = new file (path); // Establish a File object representative of the SUB directory and get one reference IF (d.exists ()) {// check if the SUB directory exists (); out.println ("Sub directory, deleted"); } else {d.mkdir (); // Established subdirectory Out.println ("Sub directory does not exist, established");}%> </ body> </ html></p>
<p>How to handle virtual directories in JSP</p>
<p><% @ Page ContentType = "Text / HTML; Charset = GB2312"%> <% @ Page Import = "Java.io. *"%> <HTML> <HEAD> <Title> JSP How to Handle Virtual Directory </ Title > </ head> <body> Disk path to the virtual directory <br> WEB site main directory is <font color = # ff0000> <% = request.getRealPath ("/")%> </ font> < BR> JSP page location directory location <font color = # ff0000> <% = request.getRealPath ("./")" g et / </ / <上 上 "j j j 位置 目 位置 上 位置 上 位置 位置 位置# ff0000> <% = Request.getRealPath ("../")" "" "" "<br> </ body> </ html> file properties</p>
<p><% @ Page ContentType = "Text / HTML; Charset = GB2312"%> <% @ page import = "java.util.date, java.io. *"%> <html> <head> <title> file properties Obtain </ Title> </ head> <body> <% string path = request.getRealPath ("/"); file f = new file (path, "readdata.txt"); if (f.exists ()) { %> <% = f.getName ()%> following properties: <br> <br> file length is:? <% = f.length ()%> <% = f.isFile () "is a file": "Not a file"%> <br> <% = f.Indirectory ()? "Is a directory": "Not a directory"%> <br> <% = f.canread ()? "Read": "Unreadable Take "%> <br> <% = f.canwrite ()?" Can be written ":" Not writable "%> <br> <% = f.ishidden ()?" Is a hidden file: "Not hidden File "%> <br> File's last modification date is: <% = new date (f.lastmodified ())%> <br> <%} else {f.createNewFile (); // Create one in the current directory a file named ReaData.txt%> <% = f.getName ()%> following properties: <br> <br> file length is: <% = f.length ()%> <% = f.isFile ( "Yes File": "Not the file"%> <br> <% = f.Indirectory ()? "" Is a directory ":" Not a directory "%> <br> <% = f.canread ()?" Read ":" Do not read "%> <br> <% = f.canwrite ()?" Write ":" Not Write "%> <br> <% = f.ishidden ()?" Hidden file ":" Not hidden file "%> <br> File last modification date is: <% = new date (f.lastmodified ())%> <br> <%}%> </ body> </ html > Method for removing files in the directory</p>
<p><% @ Page ContentType = "Text / HTML; Charset = GB2312"%> <% @ page import = "java.io. *"%> <html> <head> <title> Remove the file in the directory - Column Files in the directory </ title> </ head> <body> <% string path = request.getRealPath ("/"); file d = new file (path); // Establish the file object file in the current directory. File. List [] = d.listfiles (); // acquire file object array of all files on behalf of the directory Out.println ("<font color = # ff0000>" PATH "directory: </ font> <br > "); for (int i = 0; i <list.Length; i ) {if (list [i] .isfile ()) {out.println (list [i] .Getname () " <br> " }}} Out.println ("<br> <font color = # ff0000>" "directory: </ font> <br>"); for (int i = 0; i <list. Length; i ) {if (list [i] .Indirectory ()) {out.println (list [i] .getname () "<br>");}}%> </ body> </ html> read Take all file data</p>
<p><% @ Page ContentType = "Text / HTML; Charset = GB2312"%> <% @ page import = "java.io. *, java.lang. *"%> <html> <head> <title> Read all File Data </ Title> </ head> <body> <% string path = request.getRealPath ("."); FileReader fr = new fileReader (Path "//ReadData.txt" );// The key lies in reading During the process, it is necessary to determine if the read characters have reached the end of the file, and this character is not a broken line in the file, ie it is determined whether the character value is 13. INT c = fr.read (); // reads a character // from the file to determine if the file ends are read, while (c! = - 1) {Out.print ((char) c); // Output Data c = fr.read (); // Continue to read data IF from the file (c == 13) {// Judgment whether it is a broken character out.print ("<br>"); // Output Branch Label fr.skip (1); // Skepts a character //c=fr.read();// read a character}} fr.close ();%> </ body> </ html></p></div><div class="text-center mt-3 text-grey">
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