Problem of writing data in to a file

by **thimali** on Tue Apr 17, 2007 7:30 am

Hi All;

I have a problem of writing data in to a file in the tomcat server.

In that case i have tried with several ways to write but the only way which was successfull as follows.

static public final void WriteFile(String strFile, byte[] pData)
throws IOException {

String filePathe = "C:\\Documents and Settings\\Plateau\\WebRoot\\WEB-INF\\classes\\nsclient.properties";

BufferedOutputStream outStream = new BufferedOutputStream(
new FileOutputStream(filePathe), 32768);
if (pData.length > 0)
{
outStream.write(pData, 0, pData.length);
outStream.close();
}

But i want to get the relative path of the file with out giving the full path of it.For that i have tried with the following code to get file path.

String filePathe = URLDecoder.decode(ClassLoader.getSystemResource(
"test.txt").getPath(), "UTF-8");

But it works only if i run the code as java application(with out deploying and running inside the server)

Once i use this way to write file in the server it doesn't work.
What would be the problem?Any idea?

Thanks,
Thimali

by **ggomez** on Tue Apr 17, 2007 9:52 pm

mmm

if you are using a servlet you can send an instruction thru the method doGet()
and then pass it to another mwthod that will write the data in the file.

by **thimali** on Wed Apr 18, 2007 3:43 am

Hi;

thanks for the reply.

But in this case im using jsp and im calling a java method via my jsp page.Here i want to get some text field values from the user and i want to write this value to a file which is in the server.

Any idea to do it in this way?

Thanks.

by **ggomez** on Wed Apr 18, 2007 6:08 am

OOOO ok

thats not so hard

i dont remember how is the coding but html code have a way to put a text field that send the info thru a POST method or a GET method.

then your jsp using the doGET() method can receive that information, then you have the data inside the server memory and you can do whatever you want with that.

if i find some example code i´ll post it

good luck

by **ggomez** on Wed Apr 18, 2007 6:39 am

This is a good example

Code: Select all: 1 <?xml version = "1.0"?> 2 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" 3 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> 45  6  78 <html xmlns = "http://www.w3.org/1999/xhtml"> 9 10  11 <head> 12 <title>Processing "get" requests with data</title> 13 </head> 14 Fig. 10.4 Scripting a JavaServer Page—welcome.jsp (part 1 of 3). 602 JavaServer Pages (JSP) Chapter 10 15  16 <body> 17 <% // begin scriptlet 18 19 String name = request.getParameter( "firstName" ); 20 21 if ( name != null ) { 22 23 %> <%-- end scriptlet to insert fixed template data --%> 24 25 <h1> 26 Hello <%= name %>, <br /> 27 Welcome to JavaServer Pages! 28 </h1> 29 30 <% // continue scriptlet 31 32 } // end if 33 else { 34 35 %> <%-- end scriptlet to insert fixed template data --%> 36 37 <form action = "welcome.jsp" method = "get"> 38 <p>Type your first name and press Submit</p> 39 40 <p><input type = "text" name = "firstName" /> 41 <input type = "submit" value = "Submit" /> 42 </p> 43 </form> 44 45 <% // continue scriptlet 46 47 } // end else 48 49 %> <%-- end scriptlet --%> 50 </body> 51 52 </html>

by **thimali** on Thu Apr 19, 2007 3:12 am

Hi ;

thanks a lot for the interest to reply.

I have alredy done as the way u have mentioned.What i want to do is the edited values shoud be wriiten in a .propreties file in my tomcat server.

When im reading the file in the server i had to use a code as follows.

String strFile = "/nsclient.properties";
InputStream inStream = PropertiesFileEditor.class.getClassLoader().getResourceAsStream(strFile);

The real path of this properties file is C:\Program Files\Apache Software Foundation\Tomcat 5.5\webapps\Plateau\WEB-INF\classes\nsclient.properties

this works fine with reading the file.
Is theire any similar way which i can use to wirte in to the file giving the path as String strFile = "/nsclient.properties" with out giving the full path?Because i have to deploy it later as a war file.

Thanks
Thimali

by **ggomez** on Fri Apr 20, 2007 4:26 am

MMMMMM....

if the file is in the same directory of the jsp, you dont need the fullpath

but if you need it, you can browse your directories using the File class

i did this as an example (sorry the bad variables naming)

Code: Select all: import java.util.*; public class test { public static void main(String arg[]) { Properties p= System.getProperties(); String s=p.getProperty("user.dir"); System.out.println(s); File f=new File(s); String pa=f.getParent(); System.out.println(pa); //if you want to go backward File fd=new File(pa); File[] dir=fd.listFiles(); //get a list of the files and dirs for(int x=0;x<dir.length;x++) //look for the dir or file you want { if(dir[x].getName().equals("your file")) //found { System.out.println("You found your dir"); File[] dirs=dir[x].listFiles(); for(int y=0;y<dir.length;y++) { System.out.println(dirs[y].getName()); //listing the files in the directory } } //System.out.println(dir[x]); } } }

good luck

Problem of writing data in to a file

Problem of writing data in to a file

Example

Ok

Who is online