在jsp servlet中创建文件

Question

When I create a file in java servlet , I can't find that file for opening. This is my code in servlet :

FileOutputStream fout;
    try {
        fout = new FileOutputStream("title.txt");
        new PrintStream(fout).println(request.getParameter("txttitle"));
        fout.close();
        System.out.println(request.getParameter("txttitle"));
    } catch (Exception e) {
        System.out.println("I can't create file!");
    }

Where I can find that file?

Answer 1

if you create file first as in

File f = new File("title.txt");
fout = new FileOutputStream(f);

then you use getAbsolutePath to return the location of where it has been created

System.out.println (f.getAbsolutePath());

Answer 2

Since you have'nt specified any directory for the file, it will be placed in the default directory of the process that runs your servlet container.

I would recommand you to always specify the full path of your your file when doing this kind of things.

If you're running tomcat, you can use System.getProperty("catalina.base") to get the path of the tomcat base directory. This can sometimes help.

Answer 3

Create a file object and make sure the file exists:-

File f = new File("title.txt");
if(f.exists() && !f.isDirectory()) { 
fout = new FileOutputStream(f);
new PrintStream(fout).println(request.getParameter("txttitle"));
fout.close();
System.out.println(request.getParameter("txttitle"));
}

If the servlet cannot find the file give the full path to the file specified, like new File("D:\\\\Newfolder\\\\title.txt");

Answer 4

you should check first if the file doesn't exist ,create it

if(!new File("title.txt").exists())
{
   File myfile = new File("title.txt");
    myfile.createNewFile();
}

then you can use FileWriter or FileOutputStream to write to the file i prefer FileWriter

FileWriter writer = new FileWriter("title.txt");
writer.write("No God But Allah");
writer.close();

simply simple