使用Java进行文件操作：读写、删除和路径管理实例

原创 - 日理万妓 2024-11-30 19:09 103阅读 0赞

在Java中，我们可以使用`java.io.File`类来执行文件操作。下面是一些常见的操作实例：

1. **读写文件内容**：
```java
import java.io.*;

public class FileReadWrite {
    public static void main(String[] args) {
        // 写入文件
        try (FileWriter writer = new FileWriter("example.txt")) {
            writer.write("Hello, World!");
        } catch (IOException e) {
            System.out.println("Error: " + e.getMessage());
        }

// 读取文件内容
        try (BufferedReader reader = new BufferedReader(new FileReader("example.txt")))) {
            String content = reader.readLine();
            System.out.println("Content: " + content);
        } catch (IOException e) {
            System.out.println("Error reading file: " + e.getMessage());
        }
    }
}
```

2. **创建新文件**：
```java
import java.io.*;

public class CreateFile {
    public static void main(String[] args) {
        // 创建并写入新文件
        try (PrintWriter writer = new PrintWriter("newfile.txt")) {
            writer.println("This is a new file.");
        } catch (FileNotFoundException e) {
            System.out.println("Error creating file: " + e.getMessage());
        }
    }
}
```

3. **删除文件**：
```java
import java.io.*;

public class DeleteFile {
    public static void main(String[] args) {
        // 删除指定文件
        File file = new File("example.txt");
        if (file.exists()) {
            try {
                if (!file.delete()) {
                    System.out.println("Error deleting file: " + file.getAbsolutePath());
                } else {
                    System.out.println("File deleted successfully.");
                }
            } catch (FileNotFoundException e) {
                System.out.println("Error finding file to delete: " + e.getMessage());
            }
        } else {
            System.out.println("File does not exist and cannot be deleted.");
        }
    }
}
```

4. **获取文件路径**：
```java
import java.io.*;

public class GetFilePath {
    public static void main(String[] args) {
        // 获取当前目录下的example.txt文件路径
        File file = new File("example.txt");
        if (file.exists()) {
            String filePath = file.getAbsolutePath();
            System.out.println("File path: " + filePath);
        } else {
            System.out.println("File does not exist.");
        }
    }
}
```

以上示例涵盖了Java中常用的文件操作。