Java文件处理：读写文件的基本操作案例

原创太过爱你忘了你带给我的痛 2024-09-23 21:06 81阅读 0赞

在Java中，处理文件包括读取、写入、删除等基本操作。以下是一些具体的案例：

1. **读取文件**：
```java
import java.io.File;
import java.io.BufferedReader;
import java.io.FileReader;

public class ReadFile {
    public static void main(String[] args) {
        File file = new File("path_to_your_file.txt"); // Replace with your file path

if (file.exists()) { // Check if file exists
            BufferedReader br = new BufferedReader(new FileReader(file)); // Create a reader to read the file content
            String line;
            while ((line = br.readLine()) != null) { // Loop through reading each line
                System.out.println(line); // Print the line to console
            }
            br.close(); // Close the reader to free resources
        } else {
            System.out.println("File does not exist."); // Print error message if file doesn't exist
        }
    }
}
```

2. **写入文件**：
```java
import java.io.File;
import java.io.FileWriter;

public class WriteToFile {
    public static void main(String[] args) {
        File file = new File("path_to_your_file.txt"); // Replace with your file path

FileWriter writer = new FileWriter(file); // Create a writer to write the file content
        String messageToWrite = "Hello, World!"; // The text you want to write
        writer.write(messageToWrite); // Write the text into the file
        writer.close(); // Close the writer to free resources

if (file.exists()) { // Check if the file has been written successfully
            System.out.println("File was successfully written.");
        } else {
            System.out.println("Failed to write to the file. File does not exist.");
        }
    }
}
```

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

public class DeleteFile {
    public static void main(String[] args) {
        File file = new File("path_to_your_file.txt"); // Replace with your file path

if (file.exists()) { // Check if the file exists
            file.delete(); // Delete the file
            System.out.println("File was successfully deleted."); // Print success message
        } else {
            System.out.println("Failed to delete the file. File does not exist.");
        }
    }
}
```

以上就是Java文件处理中基本的读写和删除操作的案例。