Examples of reading and writing files in JSP

Examples of JS read files
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<%@ page contenttype= "text/html;charset=gb2312"%>
<%
Variable declaration \
Java.lang.String strFileName; Filename
Java.io.File objfile; File objects
Java.io.FileReader Objfilereader; Read File objects
char[] Chrbuffer = new CHAR[10]; Buffer
int intlength; The number of characters actually read (one character in Chinese)

Set the file name to read
strFileName = "D:\\test.txt";

Create a File object
objfile = new Java.io.File (strFileName);

To determine whether a file exists
if (objfile.exists ()) {//File exists
Create a read file object
Objfilereader = new Java.io.FileReader (objfile);

Read the contents of the file
while ((Intlength=objfilereader.read (Chrbuffer))!=-1) {
Output
Out.write (chrbuffer,0,intlength);
}

Close the Read file object
Objfilereader.close ();
}
else{//file does not exist
Out.println ("The following file does not exist:" +strfilename);
}
%>
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Examples of writing files
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The text file can be written using the PrintWriter object.

Please refer to the following example:

<%@ page import= "java.io.*"%>
<%
String str = "Print Me";
Always give the path from root. This is way it almost always works.
String nameoftextfile = "/usr/anil/imp.txt";
try {
PrintWriter pw = new PrintWriter (new FileOutputStream (Nameoftextfile));
Pw.println (str);
Clean up
Pw.close ();
catch (IOException e) {
Out.println (E.getmessage ());
}
%>

Now, open imp.txt to see that the string "Print me" should already be written.

There is another way to use the IN16 tag Library's file tag to refer to http://sourceforge.net/project/?group_id=1282.
The syntax for the example is:
<ext:file action= "Write|append|create|copy|move|delete|rename|read" from= "<%= myfilename%>" >