File establishment / check and deletion
<% @ Page ContentType = "Text / HTML; Charset = GB2312"%> <% @ page import = "java.io. *"%>
file establishment, check and deletion </ 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 ("../")" "</ html> </ body> </ html></p>
<p>Number of file properties <% @ Page ContentType = "Text / HTML; Charset = GB2312"%> <% @ page import = "java.util.date, java.io. *"%> <Html> <head> <Title > File attributes </ 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 the file ":" Not the file "%> <br> <% = f.Indirectory ()?" Is a directory ":" Not a directory "%> <br> <% = f.canread ()?" Readable " : "Do not read"%> <br> <% = f.canwrite ()? "Writable": "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 (); // is currently establishment of a directory file named ReaData.txt%> <% = f.getName ()%> following properties: <br> <br> file length is: <% = f.length ()%> <% = f.isfile ()? "Yes File": "Not File"%> <br> <% = f.IsDirectory ()? "is a directory": "Not a directory"%> <br> <% = f.canread "Readable": "Do not read"%> <br> <% = f.canwrite ()? "Write": "Not Write"%> <br> <% = f.ishidden )? "It is hidden file": "Not hidden file"%> <br> File's 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> .IsDirectory ()) {out.println (List <i> .Getname () "<br>");}}%> </ body> </ html></p>
<p>Judging whether it is blank file <% @ Page ContentType = "text / html; charset = GB2312"%> <% @ page import = "java.io. *"%> <Html> <head> <title> Judging whether it is blank File </ title> </ head> <body> <% string path = request.getRealPath ("/"); out.println (path); fileReader fr = new fileReader (Path "//atend.txt"); // Establish a FileReader object and instantiate to the object generated by the FR // to use the read () method to 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 ();%> </ body> </ html> <b> Read all file data </ b> <ccid_nobr> <Table Width =" 400 "Border = "1" cellspacing = "0" cellpadding = "2" bordercolorlight = "black" bordercolordark = "#ffffff" align = "center"> <tr> <td bgcolor = "e6e6e6" class = "style =" font -Size: 9pt> <pre> <ccid_code> <% @ 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 is during the reading process, 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.</p>
<p>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 ();%> </ body> </ html> a line Read data <% @ Page ContentType = "text / html; charset = GB2312"%> <% @ page import = "java.io. *"%> <Html> <head> <title> file reading </ title > </ head> <body> <% string path = request.getRealPath (""); // Get the path of the current directory FileReader fr = new fileReader (Path "//file/inc/t.txt") // Establish a FileReader object, and instantiate to fr bufferedreader br = new bufferedreader (fr); // Establish a BufferedReader object, and instantiate to br string line = br.readline (); // read a string from the file / / Judgment whether the read string is not empty while (line! = Null) {Out.println (line "<br>"); / / Output data read from the file line = Br.Readline ); // Continue to read a row data from the file} br.close (); // Turn off the bufferedReader object fr.close (); // Off file%> </ body> </ html></p>
<p>Broken characters in the file do not read <% @ page contentty = "text / html; charSet = GB2312"%> <% @ page import = "java.io. *"%> <Html> <head> <title> Slightly not reading </ title> </ head> <body> <% 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.close ();} fr.close ();%> </ body> </ html> write data into file <% @ Page ContentType = "text / html; charSet = GB2312"%> <% @ Page Import = "java.io. *"%> <html> <head> <title> Write data </ title> </ head> <body> <% string path = request.getRealPath ("."); FileWriter FW = New FileWriter (Path "//WriteData.txt": // establishes FileWriter object, and instantiates FW // write strings into file fw.write ("Hello!"); Fw.write "This book is" JSP programming skills ""); fw.write ("Please give me a lot!"); Fw.write ("email: stride@sina.com"); fw.close ();</p>
<p>FileReader fr = new fileReader (Path "//writeData.txt"); bufferedReader br = New BufferedReader (fr); // Establishing a BufferedReader object, and instantiate to br string line = br.readline (); // read One line of data out.println (line "<br>"); br.close (); // Close BufferedReader object fr.close ();%> </ body> </ html> Write the file data branch < % @ Page ContentType = "Text / HTML; Charset = GB2312"%> <% @ page import = "java.io. *"%> <html> <head> <title> Write data branch </ title > </ head> <body> <% 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 ".</p>
<p>"); bw.newline (); // Broken BW.WRITE (" Please give me a lot! "); bw.newline (); // Broken BW.WRITE (" email: stride@sina.com "); BW. Flush (); // Update the data to the file fw.close (); // Turn off the file stream out.println ("Write file content: <br>"); FileReader fr = new fileReader (Path "// WriteData.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 ();%> </ body> </ html> How to add data to file <% @ Page ContentType =" text / html; charSet = GB2312 "%%%% > <% @ page import = "java.io. *"%> <html> <head> <title> Write file data branch </ title> </ head> <body> <% string path = request. GetRealPath ("."); randomaccessfile rf = new randomaccessfile (Path "//writedata.txt", "RW"); // Define a class RandomaccessFile object and instantiate RF.Seek (Rf.Length ()) // Move the pointer to the end of the file Rf.WriteBytes ("/ NAPPEND A line to the file!"); Rf.close (); // Turn off file stream Out.println ("Write file content: <br> "); FileReader fr = new fileReader (Path " //writedata.txt "); bufferedReader Br = New BufferedReader (fr); // Read file BufferedRead object string line = Br.Readline (); while (line! = null) {Out.println (Line "<br>"); line = br.readline ();} fr.close (); // Tight file%> </ body> </ html> </ i> </ i> </ i > </ I> Author Blog:</p>
<p>http://blog.9cbs.net/ladofwind/</p>
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