文件阅读器删除文件的内容

Question

I'm writing a java server and always read requests form the browser. 我正在编写Java服务器，并且总是从浏览器读取请求。 For example, I have in browser http://localhost:8080/C:\\Users\\1\\Desktop\\tur.txt and read this request. 例如，我在浏览器中拥有http://localhost:8080/C:\\Users\\1\\Desktop\\tur.txt并阅读此请求。 Then saves a file path. 然后保存一个文件路径。 Then I want to print the contents of the file to browser. 然后，我想将文件的内容打印到浏览器。 For example, some text which is in tur.txt . 例如， tur.txt一些文本。

I'm doing it with a method in another class. 我正在用另一个类中的方法来做。

Here is a code of this class: 这是此类的代码：

public class FileReader {
    BufferedReader in;
    File DataFile;


    public void Reader(String directory, PrintStream out) throws IOException {
        try {

            File stockInputFile = new File(directory);
            File StockOutputFile = new File(directory);

            FileInputStream fis = new FileInputStream(stockInputFile);
            FileOutputStream fos = new FileOutputStream(StockOutputFile);
            int count;
            if (new File(directory).isDirectory()) {
                directory=directory.replace('\\', '/');
                out.print("HTTP/1.0 301 Moved Permanently\r\n"+
                        "Location: /"+directory+"/\r\n\r\n");
                out.close();
                return;
            }

            // Open the file (may throw FileNotFoundException)
            InputStream f=new FileInputStream(directory);

            // Determine the MIME type and print HTTP header
            String mimeType="text/plain";
            if (directory.endsWith(".html") || directory.endsWith(".htm"))
                mimeType="text/html";
            else if (directory.endsWith(".jpg") || directory.endsWith(".jpeg"))
                mimeType="image/jpeg";
            else if (directory.endsWith(".gif"))
                mimeType="image/gif";
            else if (directory.endsWith(".txt"))
                mimeType="text/txt";
            else if (directory.endsWith(".class"))
                mimeType="application/octet-stream";
            out.print("HTTP/1.0 200 OK\r\n"+
                    "Content-type: "+mimeType+"\r\n\r\n");
            System.out.println(mimeType);
            // Send file contents to client, then close the connection
            byte[] a=new byte[4096];
            int n;
            while ((n=f.read(a))>0)
             out.write(a, 0, n);
       //     out.flush();
            out.close();
        }
        catch (FileNotFoundException x) {
            out.println("HTTP/1.0 404 Not Found\r\n"+
                    "Content-type: text/html\r\n\r\n"+
                    "<html><head></head><body>"+directory+" not found</body></html>\n");
            out.close();
        }
    }
    }

It takes a directory to find a file a file on disk and PrintStream ( PrintStream out = new PrintStream(new BufferedOutputStream(serSock.getOutputStream())); ) to print the content to browser. 它需要一个目录来找到文件，该文件位于磁盘和PrintStream上（ PrintStream out = new PrintStream(new BufferedOutputStream(serSock.getOutputStream())); ）），以将内容打印到浏览器。 But, the problem is that when I read this file. 但是，问题是当我读取此文件时。 The content of this file removes. 该文件的内容将被删除。 That means all that text that I had in tur.txt deletes. 这意味着我在tur.txt拥有的所有文本都tur.txt删除。 And the file becomes emtpty intead of beeng printed to the browser. 并且该文件成为打印到浏览器中的空白。

Can anyone explain why? 谁能解释为什么？ Thank you. 谢谢。

Answer 1

The problem was here: 问题出在这里：

FileInputStream fis = new FileInputStream(stockInputFile);
FileOutputStream fos = new FileOutputStream(StockOutputFile);

In FileOutputSteam. 在FileOutputSteam中。 So when I deleted these 2 lines the program started to work correctly. 因此，当我删除这两行时，程序开始正常工作。 I forgot that FileOutputStream clears all the data stored in the file. 我忘记了FileOutputStream会清除文件中存储的所有数据。

I would like to thank @lamsomeone for his help. 我要感谢@lamsomeone的帮助。

文件阅读器删除文件的内容

问题描述

1 个解决方案

解决方案1
0 已采纳 2015-05-19 14:05:10

文件阅读器删除文​​件的内容

问题描述

1 个解决方案

解决方案1 0 已采纳 2015-05-19 14:05:10

文件阅读器删除文件的内容

解决方案1
0 已采纳 2015-05-19 14:05:10