ファイル処理用に Java で意味のある「catch」ブロックを作成する

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.nio.charset.MalformedInputException;

public class TextFileHandler {
    public static void main(String[] args) {
        try (BufferedReader reader = new BufferedReader(new FileReader("example.txt"))) {
            String line;
            while ((line = reader.readLine()) != null) {
                System.out.println(line);
            }
        } catch (FileNotFoundException e) {
            logError("Text file not found: 'example.txt'. Please ensure the file path is correct.", e);
        } catch (MalformedInputException e) {
            logError("The file 'example.txt' appears to be corrupted or contains invalid characters.", e);
        } catch (IOException e) {
            logError("An I/O error occurred while reading 'example.txt'. Please check if the file is accessible.", e);
        }
    }

    private static void logError(String message, Exception e) {
        // Use a logging framework like Log4j or SLF4J
        System.err.println(message);
        e.printStackTrace(); // Consider logging this instead of printing
    }
}

import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.file.AccessDeniedException;

public class BinaryFileHandler {
    public static void main(String[] args) {
        try (FileOutputStream outputStream = new FileOutputStream("readonly.dat")) {
            outputStream.write(65);
        } catch (AccessDeniedException e) {
            logError("Failed to write to 'readonly.dat'. The file is read-only or you don't have the necessary permissions.", e);
        } catch (IOException e) {
            logError("An unexpected error occurred while writing to 'readonly.dat'.", e);
        }
    }

    private static void logError(String message, Exception e) {
        System.err.println(message);
        e.printStackTrace();
    }
}

import java.io.FileInputStream;
import java.io.IOException;
import java.util.zip.ZipException;
import java.util.zip.ZipInputStream;

public class ZipFileHandler {
    public static void main(String[] args) {
        try (ZipInputStream zipStream = new ZipInputStream(new FileInputStream("archive.zip"))) {
            // Process ZIP entries
        } catch (ZipException e) {
            logError("Failed to open 'archive.zip'. The ZIP file may be corrupted or incompatible.", e);
        } catch (IOException e) {
            logError("An I/O error occurred while accessing 'archive.zip'.", e);
        }
    }

    private static void logError(String message, Exception e) {
        System.err.println(message);
        e.printStackTrace();
    }
}

import org.apache.poi.openxml4j.exceptions.InvalidFormatException;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import java.io.FileInputStream;
import java.io.IOException;

public class ExcelFileHandler {
    public static void main(String[] args) {
        try (FileInputStream fis = new FileInputStream("spreadsheet.xlsx")) {
            WorkbookFactory.create(fis);
        } catch (InvalidFormatException e) {
            logError("The file 'spreadsheet.xlsx' is not a valid Excel file or is in an unsupported format.", e);
        } catch (IOException e) {
            logError("An error occurred while reading 'spreadsheet.xlsx'. Please check the file's integrity.", e);
        }
    }

    private static void logError(String message, Exception e) {
        System.err.println(message);
        e.printStackTrace();
    }
}

import org.xml.sax.SAXException;

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import java.io.File;
import java.io.IOException;

public class XMLFileHandler {
    public static void main(String[] args) {
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            factory.newDocumentBuilder().parse(new File("config.xml"));
        } catch (SAXException e) {
            logError("Failed to parse 'config.xml'. The XML file may be malformed.", e);
        } catch (IOException e) {
            logError("An error occurred while reading 'config.xml'. Please ensure the file exists and is accessible.", e);
        } catch (ParserConfigurationException e) {
            logError("An internal error occurred while configuring the XML parser.", e);
        }
    }

    private static void logError(String message, Exception e) {
        System.err.println(message);
        e.printStackTrace();
    }
}

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class InterruptedFileReader {
    public static void main(String[] args) {
        Thread fileReaderThread = new Thread(() -> {
            try (BufferedReader reader = new BufferedReader(new FileReader("largefile.txt"))) {
                String line;
                while ((line = reader.readLine()) != null) {
                    System.out.println(line);
                    // Simulate processing time
                    Thread.sleep(100);
                }
            } catch (IOException e) {
                logError("I/O error while reading 'largefile.txt'.", e);
            } catch (InterruptedException e) {
                logError("File reading operation was interrupted. Rolling back changes or cleaning up.", e);
                Thread.currentThread().interrupt(); // Restore the interrupt status
            }
        });

        fileReaderThread.start();
        // Assume some condition requires interruption
        fileReaderThread.interrupt();
    }

    private static void logError(String message, Exception e) {
        System.err.println(message);
        e.printStackTrace();
    }
}