Question

问题以及我在哪里：我无法将文字附加到我使用该程序创建的这些新文件中。目前它只复制文件但不附加它们。见评论行 "// append file name into the new file "。

其次，最终转储文件似乎只附加.java文件，它没有读取或附加输入文件。

对我尝试做的事情的解释：

长期和短期是我试图制作一个程序，将其放入随机文件夹中，其中.txt文件填充数据。

我需要程序

只查看
然后取任何.txt文件和
a）制作副本，但将原始文件名附加到文本正文中（在顶部），在＆＃34;＆lt;＆lt; filenamehere.txt＆＃34;进入体内（在顶部）

b）然后复制original.txt的正文内容 c）获取前置的.txt文件并将其附加到单个dump.txt文件中 d）对所有本地txt文件重复此操作并继续追加到dump.txt文件的末尾

所以最后，如果我有7个文件，我将有7个附加副本和1个巨大转储文件，其中包含7个附加副本的所有内容。例如，如果我有三个文本文件，每个文件只有一个单词。所以a.txt，b.txt，c.txt 这三个词是＆＃34; Hello world！＆＃34;。 a.txt副本将包含

内的内容

＆＃34;＆GT; A.TXT

您好

＆＃34;

现在它只是复制Hello（原始正文内容）但不附加＆gt; a.txt。最终的转储文本文件不会累积其他文件中的任何内容，但奇怪的是从.java文件中获取源代码。基本上，我得到一个//输出文件夹，里面是.txt文件的副本和megaDump.txt，它们设法获取.java文本，但没有附加其他文本文件。

import java.io.* ;
import java.nio.file.*;

public class FilePrepender // class name 
{
    public static void main (String [] args)
    {
        // make a giant dump file which we will append all read files into  
        try {
            new File("Output\\").mkdirs();
            File megaDumpFile = new File("Output\\masterDump.txt");

            if (megaDumpFile.createNewFile()) {
                System.out.println("File creation success");
            } else {
                System.out.println("File was not made. File already exists. Please delete");
            }

        } catch (IOException e) {

        }

        //grab file names 
        File folder = new File(".");
        File[] listOfFiles = folder.listFiles();
        for (int i = 0; i < listOfFiles.length; i++) {
            if (listOfFiles[i].isFile()) {
                listOfFiles[i].getName();
            } else if (listOfFiles[i].isDirectory()) {
                //do nothing
            }
        }

        //open files + duplicate + prepend + and append product to end of master dump file 
        // main for 
        for (int j = 0; j < listOfFiles.length; j++){
            //append file name for mega dump file 
            String fileNameTemp = listOfFiles[j].getName();  // get file name 
            try { 
                PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("Output//masterDump.txt", true)));
                out.println(fileNameTemp);
                out.flush();
                out.close();
            }
            catch (IOException e) {  

            }

            // duplicate input files 
            FileInputStream instream = null;
            FileOutputStream outstream = null;

            try {
                File infile =new File(""+listOfFiles[j].getName());
                File outfile =new File("Output\\"+listOfFiles[j].getName());

                instream = new FileInputStream(infile);
                outstream = new FileOutputStream(outfile);

                byte[] buffer = new byte[1024];

                int length;

                // apend file name into the new file 
                // String fileNameTemp = listOfFiles[j].getName();  // get file name 

                try { 
                    PrintWriter out = new PrintWriter(new BufferedWriter(new FileWriter("Output//masterDump.txt", true)));
                    out.println(">"+fileNameTemp);
                    out.flush();
                    out.close();
                }
                catch (IOException e) {  

                }


                // now copy contents of previous file into the new file 

                /*copying the contents from input stream to
                * output stream using read and write methods
                */
                while ((length = instream.read(buffer)) > 0){
                    outstream.write(buffer, 0, length);
                }
                //Closing the input/output file streams
                instream.close();
                outstream.close();

                // file is copied 
            } catch(IOException ioe) { 

            }

            // copy newly copied file into mega dump 
            try {
                File infile =new File("Output\\"+listOfFiles[j]); // newly copied 
                File outfile =new File("Output\\masterDump.txt");

                instream = new FileInputStream(infile);
                outstream = new FileOutputStream(outfile);

                byte[] buffer = new byte[1024];

                int length;
                /*copying the contents from input stream to
                * output stream using read and write methods
                */
                while ((length = instream.read(buffer)) > 0){
                    outstream.write(buffer, 0, length);
                }

                //Closing the input/output file streams
                instream.close();
                outstream.close();

                // file is copied 

            } catch(IOException ioe) {

            }

        } // end for loop 
    } // end main 
} // end class

Answer 1

这里有很多问题：

您使用的文件路径有时会斜线，有时会出现2个反斜杠，有时甚至是双斜线，至少在我的Mac上会出现问题。只需使用常规正斜杠即可。
代码还没有过滤.txt文件，因此处理了当前目录中的所有内容 - 甚至是正在执行的程序本身。
目前，代码将> sometext.txt行直接写入您的masterDump.txt，而不是间接通过您的文件副本。
由于文件未在附加模式下打开，代码会在循环的每次迭代中覆盖masterDump.txt。

以下是当在包含“Hello”，“World”和“！”的a.txt，b.txt和c.txt的文件夹中调用时，当前产生以下结果的代码。分别。我希望这是理想的行为请注意，此代码中有很多需要改进的地方，尤其是处理注释中已经指出的错误。

import java.io.* ;
import java.nio.file.*;

public class FilePrepender // class name 
{
    public static void main (String [] args)
    {
        // make a giant dump file which we will append all read files into  
        try {
            new File("Output/").mkdirs();
            File megaDumpFile = new File("Output/masterDump.txt");

            if (megaDumpFile.createNewFile()) {
                System.out.println("File creation success");
            } else {
                System.out.println("File was not made. File already exists. Please delete");
            }

        } catch (IOException e) {

        }

        //grab file names 
        File folder = new File(".");
        File[] listOfFiles = folder.listFiles();
        for (int i = 0; i < listOfFiles.length; i++) {
            if (listOfFiles[i].isFile()) {
                listOfFiles[i].getName();
            } else if (listOfFiles[i].isDirectory()) {
                //do nothing
            }
        }

        //open files + duplicate + prepend + and append product to end of master dump file 
        // main for 
        for (int j = 0; j < listOfFiles.length; j++){
            //append file name for mega dump file 
            String fileNameTemp = listOfFiles[j].getName();  // get file name
            if (!fileNameTemp.toLowerCase().endsWith(".txt")) {
                continue;
            } 

            // duplicate input files 
            FileInputStream instream = null;
            FileOutputStream outstream = null;

            try {
                File infile =new File(""+listOfFiles[j].getName());
                File outfile =new File("Output/"+listOfFiles[j].getName());

                instream = new FileInputStream(infile);


                byte[] buffer = new byte[1024];

                int length;

                // apend file name into the new file 
                // String fileNameTemp = listOfFiles[j].getName();  // get file name 
                outstream = new FileOutputStream(outfile);
                PrintWriter out = new PrintWriter(outstream);
                out.println(">"+fileNameTemp);
                out.flush();
                out.close();

                // now copy contents of previous file into the new file 

                /*copying the contents from input stream to
                * output stream using read and write methods
                */
                outstream = new FileOutputStream(outfile, true);
                while ((length = instream.read(buffer)) > 0){
                    outstream.write(buffer, 0, length);
                }
                //Closing the input/output file streams
                instream.close();
                outstream.close();

                // file is copied 
            } catch(IOException ioe) { 

            }

            // copy newly copied file into mega dump 
            try {
                File infile =new File("Output/"+listOfFiles[j]); // newly copied 
                File outfile =new File("Output/masterDump.txt");

                instream = new FileInputStream(infile);
                outstream = new FileOutputStream(outfile, true);

                byte[] buffer = new byte[1024];

                int length;
                /*copying the contents from input stream to
                * output stream using read and write methods
                */
                while ((length = instream.read(buffer)) > 0){
                    outstream.write(buffer, 0, length);
                }

                //Closing the input/output file streams
                instream.close();
                outstream.close();

                // file is copied 

            } catch(IOException ioe) {

            }

        } // end for loop 
    } // end main 
} // end class

Answer 2

与他人同意：每当您触摸＆＃39;时，您都会删除自己的进度。你的masterDump文件。这是我的版本：

import java.io.* ;
import java.nio.file.*;

public class FilePrepender // class name
{
     public static void main (String [] args)
    {
        //Generates the string for the output for the right PC.
        String OUTFILE="Output"+File.separator+"masterDump.txt";

       // make a giant dump file which we will append all read files into
        try {
            new File("Output").mkdirs();
            File megaDumpFile = new File(OUTFILE);
            megaDumpFile.createNewFile();

        } catch (IOException e) {
            System.out.println("Something weird occured!");
        }

        File folder = new File(".");
//      FileFilter filter = new istext();
//      File[] listOfFiles = folder.listFiles( filter );

     //grab file names
        File[] listOfFiles = folder.listFiles();

        try {
            FileOutputStream fout = new FileOutputStream ( new File(OUTFILE));
            PrintWriter pout = new PrintWriter( fout ); 
            for (int j = 0; j < listOfFiles.length; j++){

                //Hacky fix cause java is hard:
                if ( ! listOfFiles[j].getName().endsWith(".txt")) { continue ; }

                //append file name for mega dump file
                pout.println(listOfFiles[j].getName());  // Append File-name
                pout.flush(); //Probably a better way than this, but eh.

                //Copy the file's text
                Files.copy(listOfFiles[j].toPath(), fout);
                fout.flush(); //Again, eh.
            }
            pout.close();
            pout.close();
            }
            catch (IOException e) {

            }

        }
}
/*  Ugh, IDK how to java. (This is the non-hacky way, but idk how to.)

public class istext implements FileFilter {
    public static void accept(File pathname){
        return( pathname.getName().endsWith(".txt"));
    }
}

*/

在尝试创建文本文件操纵器时，文本未附加到新文件中

2 个答案: