This article in the JSP program is based on the function of their own set up a separate program, we want to use what function, their combination of it.
Establishment/inspection and deletion of documents
<%@ page contenttype= "text/html;charset=gb2312"%>
<%@ page import= "java.io.*"%>
<title> the establishment, inspection and deletion of documents </title>
<body>
<%
String Path=request.getrealpath ("");
OUT.PRINTLN (path);
File F=new file (path, "File.txt");
Out.println (f);
Out.println (F.exists ());
if (f.exists ()) {//check if File.txt exists
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, has been established. ");//The directory path where the output is currently located
}
%>
Establishment/inspection and deletion of catalogs
<%@ page contenttype= "text/html;charset=gb2312"%>
<%@ page import= "java.io.*"%>
<title> Directory Establishment/inspection and deletion </title>
<body>
<%
String Path=request.getrealpath ("");
Path=path + "\\Sub";//the directory path to be established
File D=new file (path);//Create a File object that represents the sub directory and get a reference to it
if (d.exists ()) {//Check whether the Sub directory exists
D.delete ();
OUT.PRINTLN ("Sub directory exists, deleted");
}else{
D.mkdir ();//Build Sub Directory
OUT.PRINTLN ("Sub directory not present, established");
}
%>
</body>
How to work with virtual directories in a JSP
<%@ page contenttype= "text/html;charset=gb2312"%>
<%@ page import= "java.io.*"%>
How to work with virtual directories in <title>jsp </title>
<body>
Get the disk path for the virtual directory <br>
The location of the Web site home directory is <font color= #ff0000 ><%=request.getrealpath ("/")%></font><br>
The directory location where the JSP Web page resides <font color= #ff0000 ><%=request.getrealpath ("./")%></font><br>
The location of a directory on the directory where the JSP Web page resides <font color= #ff0000 ><%=request.getrealpath (". /")%></font><br>
</body>
Acquisition of file attributes
<%@ page contenttype= "text/html;charset=gb2312"%>
<%@ page import= "java.util.date,java.io.*"%>
<title> the acquisition of file properties </title>
<body>
<%
String Path=request.getrealpath ("/");
File F=new file (path, "ReadData.txt");
if (f.exists ()) {
%>
The properties of the <%=f.getname ()%> are as follows:<br><br>
File length: <%=f.length ()%>
<%=f.isfile ()? " Is file ": Not File"%><br>
<%=f.isdirectory ()? " is directory ": Not directory"%><br>
<%=f.canread ()? " Readable ": Unreadable"%><br>
<%=f.canwrite ()? " Writable ": Not writable"%><br>
<%=f.ishidden ()? " is hidden file ": Not hidden file"%><br>
The last modified date for the file is: <%=new date (f.lastmodified ())%><br>
<%
}else{
F.createnewfile ()//Create a file named ReaData.txt in the current directory
%>
The properties of the <%=f.getname ()%> are as follows:<br><br>
File length: <%=f.length ()%>
<%=f.isfile ()? " Is file ": Not File"%><br>
<%=f.isdirectory ()? " is directory ": Not directory"%><br>
<%=f.canread ()? " Readable ": Unreadable"%><br>
<%=f.canwrite ()? " Writable ": Not writable"%><br>
<%=f.ishidden ()? " is hidden file ": Not hidden file"%><br>
The last modified date for the file is: <%=new date (f.lastmodified ())%><br>
<%
}
%>
</body>
Ways to remove files in a directory
<%@ page contenttype= "text/html;charset=gb2312"%>
<%@ page import= "java.io.*"%>
<title> How to remove files from the directory--list files in the directory </title>
<body>
<%
String Path=request.getrealpath ("/");
File D=new files (path);//Create a FileName object in the current directory
File List[]=d.listfiles ()//To get an array of file objects representing all the files in the directory
Out.println ("<font color= #ff0000 >" + path + "file:</font><br> under directory");
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:</font><br>");
for (int i=0;i<list.length;i++) {
if (List[i].isdirectory ()) {
Out.println (List[i].getname () + "<br>");
}
}
%>
</body>
Determine if it is a blank file
<%@ page contenttype= "text/html;charset=gb2312"%>
<%@ page import= "java.io.*"%>
<title> Determine whether it is a blank file </title>
<body>
<%
String Path=request.getrealpath ("/");
Out.println (path);
FileReader fr=new FileReader (path + "\\AtEnd.txt");//Create a FileReader object, and instantiate it as FR
////To object generated by the FileReader class using the Read () method, You can read and remove one character from the character stream.
if (Fr.read () ==-1)//Determines if read to the end of the file
{
out.print ("No data in AtEnd.txt file <br>");
} else{
out.println ("There is data in AtEnd.txt file");
Fr.close ();
%>
</body>
Read all the file data
<%@ page contenttype= "text/html;charset=gb2312"%>
<%@ page import= "java.io.*,java.lang.*"%>
<title> Read all the file data </title>
<body>
<%
String Path=request.getrealpath (".");
FileReader fr=new FileReader (path + "\\ReadData.txt");
The key is that in the reading process, you determine whether the character you read is at the end of the file, and that the character is not a break in the file, that is, whether the character value is 13.
int C=fr.read ()//reading a character from a file
Determine if the end of the file has been read
while (C!=-1) {
Out.print ((char) c);//output read data
C=fr.read ()//Continue reading data from file
if (c==13) {//To determine whether the break character
Out.print ("<br>");//Output Branch label
Fr.skip (1);//Skip one character
C=fr.read ()//Read a character
}
}
Fr.close ();
%>
</body>
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