Create folders and files in JSP

Determine whether a file exists in JSP and create folders and files.

Memo.

In WinXP + Tomcat5.1, the code is as follows:

<%

//Get the web root path //Absolute path
//getServletContext().getRealPath("/") Get the root path of the web application
// D:webexcel, "D:web" is the root path of the web application, "excel" is the folder in the root directory
String Save_Location=getServletContext().getRealPath("/")+"excel\";

try{
if (!(new java.io.File(Save_Location).isDirectory())) //If the folder does not exist
{
new java.io.File(Save_Location).mkdir(); //Does not exist excel folder, create this folder
new java.io.File(Save_Location)+"gmcc\").mkdir(); //Create a folder named gmcc under the excel folder
}
else //Exists excel folder, create this folder directly
{
new java.io.File(Save_Location)+"gmcc\").mkdir(); //Create a folder named gmcc under the excel folder
}
} catch(Exception e){
e.printStackTrace(); //Failed to create folder

//Use URLEncoder encoding in the link to pass Chinese parameters.
//The receiving page can use getParameter() to obtain this parameter, the page's charset=GB2312.
String ErrName=java.net.URLEncoder.encode("The folder does not exist. Error creating the folder!");
response.sendRedirect("errorpage.jsp?error="+ErrName); //Jump to the error page
return;
}

//Create a new myfile.txt file in the gmcc folder
java.io.File myFile = new java.io.File(Save_Location+"gmcc\myfile.txt");
java.io.FileOutputStream fout = null;
try {
fout = new java.io.FileOutputStream(myFile);
byte b[]= "Hello!".getBytes();
fout.write(b);
fout.flush() ; //Write file
fout.close(); //Close
}
catch (java.io.FileNotFoundException e) {
e.printStackTrace();
}
catch (java.io.IOException ex) {
ex.printStackTrace();
}

%>

J.R.Q.