How do I read text file and output in Servlet?

Question

i have file: input.txt I want to read this file, put values in new output.txt from input.txt.

Servlet.java

protected void processRequest(HttpServletRequ         


        

Answer 1

Try following code

input.txt should be present in the root directory of your application

protected void processRequest(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
        response.setContentType("text/plain");
        response.setHeader("Content-Disposition", "attachment;filename=output.txt");
        PrintWriter out = response.getWriter();
        ServletContext cntxt = this.getServletContext();
        String fName = "/input.txt";
        InputStream ins = cntxt.getResourceAsStream(fName);
        try {
            if (ins != null) {
                InputStreamReader isr = new InputStreamReader(ins);
                BufferedReader reader = new BufferedReader(isr);
                int n = 0;
                String word = "";
                while ((word = reader.readLine()) != null) {
                    n = Integer.parseInt(word);
                    out.println(n);
                }
            }
        }finally {
            out.close();
        }
    }

Answer 2

Apache FileUtils, could make it simple

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

    PrintWriter out = response.getWriter();

    List<String> lines = FileUtils.readLines(new File("file.txt), "UTF-8");

    for (String line : lines) {
        out.println(line);
    }
}