Question

此程序需要从1个文本文件中读取“信用卡”号码，将它们与第2个进行比较，如果匹配，则将其与第3个进行比较，然后显示所有3个匹配的数字。

我遇到了很多麻烦，无法弄清楚什么是错的。任何帮助将不胜感激。

@echo off

set completepath=c:\users\microsoft\desktop\source
set destination=c:\users\microsoft\desktop\destination

set /a yesterday=%date:~4,2% - 1
set yesterday_date=%date:~10,2%%date:~7,2%%yesterday%

FOR /R %completepath% %%G IN (*.csv) DO call :process "%%~dpG" "%%~nG"
pause >nul

:process
SET %name%=%~2
SET chkname=%name:*%yesterday_date%=?%
IF "%chkname:~0,1%"=="?" (
    xcopy %~1 %destination% /y 
)

Answer 1

我在这里看到了一些错误。

您永远不会在match = true中设置main因此会永远循环。

confirm = searchTwo(creditNumber);
if(confirm == true){
    confirm = searchTwo(creditNumber);      
    System.out.println(confirm);
    break;
}

这段代码是多余的。

仅当searchTwo()返回searchThree()时，

true才会返回。

您没有在while循环中检查是否相等，您只是设置变量。

while(match = false & creditNumber != null)

应更改为：

while(match == false && creditNumber != null)

您需要在while循环中读取一个新行，而不只是在其外部读取一行。您目前的方式是，只读取文件的第一行。

Answer 2

你可以看看我的解决方案吗？它并不完美，但我认为它是可扩展的......

我创建了一个包含以下信用卡文件的简单项目：

<强> creditCards1.txt：

5416247983974134
5572941594858518
5110952365939493
5154933849210203
5272835420269481

<强> creditCards2.txt：

5562949040660851
5139055358731815
5154933849210203
5152652348339972
5382178174490350
5272835420269481
5564201755352300
5572941594858518

<强> creditCards3a.txt：

5121672532009148
5328229152859756
5272835420269481
5258620703451297
5154933849210203
5411765815619689

<强> creditCards3b.txt：

5121672532009148
5328229152859756
5258620703451297
5411765815619689

<强> creditCards4.txt：

5121672532009148
5328229152859756
5272835420269481
5258620703451297
5411765815619689

然后我创建了以下junit测试用例：

package creditcard.search;

import java.io.File;
import java.io.IOException;
import java.util.Set;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;
import org.junit.Before;
import org.junit.Test;

public class CreditCardSearchTest {

    private CreditCardSearch creditCardSearch;

    @Before
    public void setUp() {
        creditCardSearch = new CreditCardSearch();
        creditCardSearch.addCreditCardsFile(new File("creditCards1.txt"));
        creditCardSearch.addCreditCardsFile(new File("creditCards2.txt"));
    }

    @Test
    public void assert_creditcards_found_in_2_files() throws IOException {
        final Set<String> creditcards = creditCardSearch.searchForMatchesInAllFiles();

        assertNotNull(creditcards);
        assertEquals(3, creditcards.size());
        assertTrue("5154933849210203", creditcards.contains("5154933849210203"));
        assertTrue("5272835420269481", creditcards.contains("5272835420269481"));
        assertTrue("5572941594858518", creditcards.contains("5572941594858518"));
    }

    @Test
    public void assert_creditcards_found_in_3_files() throws IOException {
        creditCardSearch.addCreditCardsFile(new File("creditCards3a.txt"));

        final Set<String> creditcards = creditCardSearch.searchForMatchesInAllFiles();

        assertNotNull(creditcards);
        assertEquals(2, creditcards.size());
        assertTrue("5154933849210203", creditcards.contains("5154933849210203"));
        assertTrue("5272835420269481", creditcards.contains("5272835420269481"));
    }

    @Test
    public void assert_creditcards_not_found_in_3_files() throws IOException {
        creditCardSearch.addCreditCardsFile(new File("creditCards3b.txt"));

        final Set<String> creditcards = creditCardSearch.searchForMatchesInAllFiles();

        assertNotNull(creditcards);
        assertTrue(creditcards.isEmpty());
    }

    @Test
    public void assert_creditcards_found_in_4_files() throws IOException {
        creditCardSearch.addCreditCardsFile(new File("creditCards4.txt"));

        final Set<String> creditcards = creditCardSearch.searchForMatchesInAllFiles();

        assertNotNull(creditcards);
        assertEquals(1, creditcards.size());
        assertTrue("5272835420269481", creditcards.contains("5272835420269481"));
    }
}

最后但并非最不重要的是实施：

package creditcard.search;

import java.io.File;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

public class CreditCardSearch {

    private final Set<File> files = new HashSet();

    public void addCreditCardsFile(final File file) {
        files.add(file);
    }

    public Set<String> searchForMatchesInAllFiles() throws IOException {
        if(files.size() < 2) {
            throw new IllegalArgumentException("a minimum of 2 creditcard files required");
        }

        final Map<Path, List<String>> linesPerPath = new HashMap<>();
        for(final File file : files) {
            final Path path = file.toPath();
            linesPerPath.put(path, Files.readAllLines(path));
        }

        final Set<String> creditcards = new HashSet();

        final Iterator<Path> it = linesPerPath.keySet().iterator();

        List<String> linesA = null;

        while (it.hasNext()) {
            if (null == linesA) {
                linesA = linesPerPath.get(it.next());
            }
            List<String> linesB = linesPerPath.get(it.next());
            linesA.retainAll(linesB);
        }

        creditcards.addAll(linesA);

        return creditcards;
    }

}

junit测试结果：

-------------------------------------------------------------------------------
Test set: creditcard.search.CreditCardSearchTest
-------------------------------------------------------------------------------
Tests run: 4, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.105 sec

项目代码可以在GitHub找到：https://github.com/StefanHeimberg/stackoverflow-31952730

阅读3个文本文件并查找匹配号码？

2 个答案: