File establishment / check and deletion <% @ page contenttype = "text / html; charSet = GB2312"%> <% @ page import = "java.io. *"%>
File Establishment, Check and Delete </ Title></p>
<p><% 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>Content / Check and Delete <% @ Page ContentType = "TEXT / HTML; Charset = GB2312"%> <% @ page import = "java.io. *"%></p>
<p><title> Directory Establish / Check and Delete </ Title></p>
<p><% 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 a reference IF (D.Exists ()) {// check if the SUB directory exists (); out.println ("Sub directory exists, deleted");} else {d.mkdir (); // Establish a sub-directory out.println ("Sub directory does not exist, established");}%></p>
<p>How to process virtual directory in JSP <% @ page contentty = "text / html; charset = GB2312"%> <% @ page import = "java.io. *"%></p>
<p><Title> How to deal with virtual directory </ title></p>
<p>Take the disk path corresponding to the virtual directory <br> The location of the web site main directory is <font color = # ff0000> <% = request.getRealPath ("/")%> </ font> <br> JSP web page location <font color = # ff0000> <% = request.getRealPath ("./")" (". GetRealPath ("../")%" (font> <br></p>
<p><% @ Page contentty = "text / html; charSet = GB2312"%> <% @ page import = "java.util.date, java.io. *"%> <Title> file properties " / Title></p>
<p><% String path = request.getRealPath ("/"); file f = new file (path, "readdata.txt"); if (f.exists ()) {%> <% = f.getname ()%> the properties are as follows: <br> <br> file length is: <% = f.length ()%> <% = f.isFile () "is a file":? "is not a file"%> <br> <% = F.ISDirectory ()? "is a directory": "Not a directory"%> <br> <% = f.canread ()? "Readable": "Do not read"%> <br> <% = f. CanWrite ()? "Write": "Not Writing"%> <br> <% = f.ishidden ()? "is a hidden file": "Not hidden file"%> <br> File final modification date To: <% = new date (f.lastmodified ())%> <br> <%} else {f.createNewFile (); // Create a file%> <% = in the current directory f.getName ()%> attributes are as follows: <br> <br> file length is:? <% = f.length ()%> <% = f.isFile () "file": "No file"% > <br> <% = f.Indirectory ()? "is a directory": "Not a directory"%> <br> <% = f.canread ()? "Readable": "Do not read"%> < Br> <% = f.canwrite ()? "Write": "Not Write"%> <br> <% = f.ishidden ()? "is a hidden file": "Not hidden file"%> < The final modification date of the Br> file is: <% = new date (f.lastmodified ())%> <br> <%}%></p>
<p>Take out the file in the directory <% @ Page ContentType = "text / html; charset = GB2312"%> <% @ page import = "java.io. *"%></p>
<p><title> Remove the method in the directory - list files in the directory </ title></p>
<p><% String path = request.getRealPath ("/"); file d = new file (path); // Establish the file object file list "in the current directory" file list [] = D.ListFiles (); // acquire the representative directory File object array of all files Out.println ("<font color = # ff00>" 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> " PATH " directory directory: </ font> <br> "); for (int i = 0; i <list.length; i ) {if (List [i] .IsDirectory ()) {OUT.PRINTLN (List [i] .Getname () "<br>");}}}%> Judgment is a blank file <% @ Page ContentType = "text / html; charset = GB2312"%> <% @ Page Import = "java.io. *"%></p>
<p><title> Judging whether it is blank file </ title></p>
<p><% String path = request.getRealPath ("/"); out.println (path); fileReader fr = new fileReader (Path //atend.txt" "// established FileReader object, and instantiates FR / / A object generated by the FileReader class uses the READ () method, you can read the next character from the character stream. if (fr.read () == - 1) // determines if the end of the file is read {OUT.PRINT ("There is no data <br>" in atend.txt file ");} else {Out.println (" Atend Data in .txt file ");} fr.close ();%></p>
<p>Read all file data <% @ page contenttype = "text / html; charset = GB2312"%> <% @ page import = "java.io. *, Java.lang. *"%></p>
<p><Title> Read all file data </ title></p>
<p><% String path = request.getRealPath ("."); FileReader fr = new fileReader (Path "//ReadData.txt") ;// key is during reading, to determine if the read character has arrived. 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); // Skose a character //c=fr.read ();// read a character}} fr.close ();%> One row reading data <% @Page ContentType = "Text / html; charset = GB2312"%> <% @ page import = "java.io. *"%></p>
<p><title> file reading </ title></p>
<p><% String path = request.getRealPath (""); // Get the path of the current directory FileReader fr = new fileReader (PATH //File/INC / / / RTI ID t 建 建 " Instantiate to fr bufferedreader br = new bufferedreader (fr); // Establish a bufferedReader object, and instantiate to br string line = br.readline (); // read a line of string from the file // judge the character read Whether the string is not empty while (line! = Null) {outputln (line "<br>"); // Output data read from the file line = br.readline (); // Continue from the file Read a line of data} br.close (); // Turn off the bufferedReader object fr.close (); // Off file%></p>
<p>Listening the characters in the file do not read <% @ Page ContentType = "Text / HTML; Charset = GB2312"%> <% @ page import = "java.io. *"%></p>
<p><Title> Listening to bytes </ Title></p>
<p><% String path = request.getRealPath ("."); FileReader fr = new fileReader (Path "//ReadData.txt" );fr.skip(2);// skip 2 bytes int C = fr .read (); // Read a byte while (c! = - 1) {OUT.PRINT ((char) c); c = fr.read ();} fr.close ();%></p>
<p>Write the data <% @ page contentty = "text / html; charset = GB2312"%> <% @ page import = "java.io. *"%></p>
<p><title> Write data into file </ title></p>
<p><% String path = request.getRealPath ("."); FileWriter FW = New FileWriter (Path //WriteData.txt ": // establishes a FileWriter object, and instantiate FW // Write strings into file FW .write ("Hello!"); fw.write ("This book is" JSP programming skill "); fw.write (" Please give me a lot! "); fw.write (" email: stride@sina.com "); fw.close (); FileReader fr = new fileReader (path " //writedata.txt" ); bufferedReader br = New BufferedReader (fr); // Establish a bufferedReader object, and instantiate to Brstring Line = Br. Readline (); // Reads a line of data out.println (line "<br>"); br.close (); // Close BufferedReader object fr.close ();%></p>
<p><% @ Page contentty = "text / html; charset = GB2312"%> <% @ Page Import = "Java.io. *"%></p>
<p><title> Write the data branch of the file </ title></p>
<p><% String path = Request.getRealPath ("."); FileWriter FW = new filewriter (Path "//writedata.txt" ); bufferedwriter bw = new bufferedwriter (fw); bw.write (" Hello! ") BW.WRITE ("This book is" JSP programming skills "."); bw.newline (); // break BW.WRITE ("Please give me a lot!"); bw.newline (); // Broken BW. Write ("email: stride@sina.com"); bw.flush (); // update data to file fw.close (); // Off File Out.println ("Write file content is: <br > "); FileReader fr = new fileReader (path " //writedatedata.txt" ); bufferedreader br = new bufferedreader (fr); string line = br.readline (); // read a line of data while (line! = NULL) {OUT.PRINTLN (Line "<br>"); line = br.readline ();} fr.close ();%></p>
<p>How to add data to file <% @ Page ContentType = "text / html; charset = GB2312"%> <% @ page import = "java.io. *"%></p>
<p><title> Write the data branch of the file </ title></p></div><div class="text-center mt-3 text-grey">
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