如何在Servlet中读取文本文件和输出？

问题描述

我有文件：input.txt
我想读取此文件，将值放在input.txt的新output.txt中。

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

Servlet。 java

Servlet.java

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();
      }
}

但是output.txt为空。出了什么问题？

but output.txt is empty. What's wrong?

推荐答案

Apache FileUtils，可以简化

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);
    }
}

这篇关于如何在Servlet中读取文本文件和输出？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！