Java代码无法找到或找到指定的文件路径

Question

所以，我可能会遗漏一些非常明显的东西，但据我所知，我已经尝试了一切。基本上我所拥有的是一个删除代码，它根据关键字从txt文件中提取路径。每次我尝试它似乎无法找到文件路径。所以我尝试用代码中的直接路径替换从文件中提取路径的代码，但它仍然不起作用。所以这些是我的麻烦，这是我的代码。任何帮助都会有所帮助。

import java.util.*;
import java.io.*;
import java.nio.*;

public class test {

public static void main (String[] args)
{
    test t = new test();
    t.test();
}

/** A test method for our code **/
public void test()
{
    String[] command = new String[3];
    String[] path = new String[3];

    BufferedReader commands = null;
    BufferedReader paths = null;

    //initialize list of commands
    ArrayList<String[]> commandList = new ArrayList<String[]>();
    ArrayList<String[]> pathList = new ArrayList<String[]>();

    //Get a list of Commands from a file
    this.getCommands( commandList );
    this.getPaths( pathList );

    //get the next command
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    System.out.print("Next Thing?\n");
    this.getCommand( br, command, commandList );
    if ( command[1] == null )
    {
        System.out.print("New command?\n");
        commandList.add( this.makeCommand( br, command ) );
    }
    else
    {
        //Not sure what you want to do here, this is if the method IS found
        if (command[1].equals("delete"))
        {
            BufferedReader brp = new BufferedReader(new InputStreamReader(System.in));
            System.out.print("Which file?\n");
            this.getPath( brp, path, pathList );
            if ( path[1] == null )
            {
                System.out.print("New command?\n");
                pathList.add( this.makePath( brp, path ) );
            }
            else
            {
                System.out.print(path[1]+":" +path[2]+" ");
                deletefile(path[1]+":" +path[2]);
            }
            this.savePath(pathList); 
        }
        else
        {
            System.out.print("Derps");
        }
        System.out.println( "We found: "+command[1]);
    }
    this.save(commandList);  

}

/**Returns the old list of commands**/
public void getCommands( ArrayList<String[]> commandList )
{
    BufferedReader commands;
    try
    {
        String sCurrentLine;

    commands = new BufferedReader(new FileReader("commands.txt"));

    while ((sCurrentLine = commands.readLine()) != null)
        {
            commandList.add( sCurrentLine.split(":") );
        }

    }
    catch (IOException e)
    {
        e.printStackTrace();
    }
}

/**
Asks the user for a command and checks it against known commands. It's not a 
very efficient algorithm, but effective. 
**/
public void getCommand( BufferedReader br, String[] command, ArrayList<String[]> commandList )
{
    try 
    {
        command[0] = br.readLine();
        for ( String[] com : commandList )
        {
            if (com[0].equals( command[0] ))
            {
                command[1] = com[1];
            }
        }
    }
    catch (IOException ioe) 
    {
        System.out.println("IO error trying to read your commnad!");
    }
}

/** Makes a new command, to be used when one isn't known **/
public String[] makeCommand( BufferedReader br, String[] command )
{
    try
    {
        command[1] = br.readLine();
    }
    catch( IOException ioe)
    {
        System.out.println("Oh no!!!");
    }
    return command;
}

/** Saves your stuff **/
public void save( ArrayList<String[]> commandList){
    try
    {
        PrintWriter writer = new PrintWriter( "commands.txt","UTF-8" );
        for ( String[] com : commandList )
        {
            writer.println( com[0]+":"+com[1] );
        }
        writer.close();
    }
    catch( Exception ioe )
    {
        System.out.println("You're in trouble");
    }
}






/**Returns the old list of commands**/
public void getPaths( ArrayList<String[]> pathList )
{
    BufferedReader paths;
    try
    {
        String sCurrentLine;

    paths = new BufferedReader(new FileReader("paths.txt"));

    while ((sCurrentLine = paths.readLine()) != null)
        {
            pathList.add( sCurrentLine.split(":") );
        }

    }
    catch (IOException e)
    {
        e.printStackTrace();
    }
}

/**
Asks the user for a path and checks it against known paths. It's not a 
very efficient algorithm, but effective. 
**/
public void getPath( BufferedReader brp, String[] path, ArrayList<String[]> pathList )
{
    try 
    {
        path[0] = brp.readLine();
        for ( String[] pat : pathList )
        {
            if (pat[0].equals( path[0] ))
            {
                path[1] = pat[1];
                path[2] = pat[2];
            }
        }
    }
    catch (IOException ioe) 
    {
        System.out.println("IO error trying to read your commnad!");
    }
}

/** Makes a new path, to be used when one isn't known **/
public String[] makePath( BufferedReader brp, String[] path )
{
    try
    {
        path[1] = brp.readLine();
        System.out.println("location");
        path[2] = brp.readLine();
    }
    catch( IOException ioe)
    {
        System.out.println("Oh no!!!");
    }
    return path;
}

/** Saves your stuff **/
public void savePath( ArrayList<String[]> pathList){
    try
    {
        PrintWriter writerPath = new PrintWriter( "paths.txt","UTF-8" );
        for ( String[] pat : pathList )
        {
            writerPath.println( pat[0]+":"+pat[1]+":"+pat[2]);
        }
        writerPath.close();
    }
    catch( Exception ioe )
    {
        System.out.println("You're in trouble");
    }
}








/** Deletes files **/
private static void deletefile(String file)
{
    File f1 = new File(file);
    boolean success = f1.delete();
    if (!success)
    {
        System.out.println("Deletion failed.");
        System.exit(0);
    }
    else
    {
        System.out.println("File deleted.");
    }
}

}

我在path.txt文件中唯一的一行是：test file

:C:/User/Carter/Desktop/AITest/test/test.txt

我的command.txt有行

delete:delete
remove:delete
d:delete

再次感谢您的帮助。

Answer 1

我建议您在尝试删除之前检查文件的路径是否存在。如下所示

File f1 = new File(path);
boolean sucess;
if (f1.exists()) {
    success = f1.delete();
} else {
    System.out.println(
        "I cannot find '" + f1.getAbsolutePath() );
}

如果找不到文件路径，将打印文件路径。

或者您可以使用Files.delete(Path)