Java重复文件查找器 [英] Java Duplicate File Finder

问题描述

大家好，



所以我找到了一个人的工作来制作一个应用程序，列出当前工作目录中的重复文件。



最终它会让你选择你可以用重复文件做什么，但是，现在它只是列出它们。



我正在使用Java（根据选择），我为此写了大约50行代码。它花了我大约20分钟，我在eclipse中运行了一个测试，我得到了InputMismatchException。但是，当应用程序运行时，我做对了。所以我继续编译项目以在命令提示符中测试它，当我运行它时（使用java -jar Duplicates.jar）它说：



No Main Manifest属性，在Duplicates.jar中



现在我觉得编译时出错了，我只是想搞清楚我为什么或如何获得InputMismatchException。它说它发生在第17和第46行。下面是我的代码，我对第17和第46行有评论。

Hello everyone,

So I was presented a job by someone to make an application that would list duplicate files in the current working directory.

Eventually it will give you a choice on what you can do with the duplicate files, but, for now it is going to just list them.

I am using Java (by choice), and I wrote out about 50 lines of code for this. It took me about 20 minutes, and I ran a test inside of eclipse and I got the InputMismatchException. However I get it right when the application goes to run. So I went ahead and compiled the project to test it in Command Prompt, and right when I run it (using java -jar Duplicates.jar) it says:

No Main Manifest Attribute, in Duplicates.jar

Now I think that was something that went wrong when I compiled, I just want to figure out why or how I am getting an InputMismatchException. It says it is occurring at lines 17 and 46. Below is my code, I have comments on lines 17 and 46.

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
public class DuplicateFileRemover {
	public static boolean CompareFiles(File x, File y) { 
		try {
			Scanner xs = new Scanner(x);
			Scanner ys = new Scanner(y);
			boolean result = true;
			while (result == true) {
				if (xs.nextByte() != ys.nextByte()) { // Line 17
					result = false;	
				}
				return result;	
			}
		} catch (FileNotFoundException e) {
			System.out.println(e.getMessage());	
		}
		return false;	
	}
	public static void main(String[] args) {
		File dir = new File(".");
		File[] fileList = dir.listFiles();
		for (int x = 0; x < fileList.length; x++) {
			for (int y = x+1; y < fileList.length; y++) {
				if (CompareFiles(fileList[x], fileList[y])) { // Line 46
					System.out.println(fileList[x]);
				}	
			}
		}
		
	}
	
}

任何人都可以看到我的代码有问题吗？由于我正在处理文件，我知道我可能需要捕获可能的FileNotFound异常。



再次，就像我之前说的那样，不需要用户输入，应用程序仅在获取当前工作目录中的文件时运行。





请帮助。

Can anyone see a problem with my code? Since I am dealing with files I knew I probably needed to catch a possible FileNotFound exception.

Again, like I said before, there is no user input required, the application runs solely on getting files in the current working directory.


Please help.

推荐答案

你的问题是由于 Scanner 类试图从输入文件解释标记并将它们转换为字节。你需要一个基本的流阅读器，它允许你从文件中读取单个字节。



试试这个：

Your problem is due to the Scanner class trying to interpret the tokens from the input file and convert them to bytes. You need a basic stream reader that will allow you to read individual bytes from the file.

Try this:

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileInputStream;


public class Test {
 
    /**
    * @param args
    */
    public static void main(String[] args) {
        File dir = new File(".");
        File[] fileList = dir.listFiles();
        for (int x = 0; x < fileList.length; x++) {
            for (int y = x+1; y < fileList.length; y++) {
                if (fileList[x].length() == fileList[y].length()) {
                    if (CompareFiles(fileList[x], fileList[y])) {
                        System.out.println(fileList[y]);
                    }
                }
            }
        }
    }

    public static boolean CompareFiles(File x, File y) {
        try {
            FileInputStream xs = new FileInputStream(x);
            FileInputStream ys = new FileInputStream(y);
            System.out.println("Compare: " + x + " vs " + y);
            boolean result = true;
            while (result == true) {
                int xb = xs.read();
                int yb = ys.read();
                if (xs.read() != ys.read()) {
                    result = false;
                    break;
                }
                if (xb == -1)
                    break;
            }
            return result;	
            } catch (FileNotFoundException e) {
                return false;
            } catch (Exception e) {
                System.out.println(e.getMessage());	
            }
        return false;	
    }
        
}

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