Java中的IO操作，如文件读写实例

原创布满荆棘的人生 2024-09-26 09:00 66阅读 0赞

在Java中，IO（Input/Output）操作主要包括文件、网络等的读写。以下是一些基本的文件读写实例：

1. 文件读取：
```java
import java.io.File;
import java.io.IOException;

public class FileReader {
    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
            try {
                // Using BufferedReader to read the file line by line
                BufferedReader reader = new BufferedReader(new FileReader(file));
                
                String line;
                while ((line = reader.readLine()) != null) { // Loop through each line
                    System.out.println(line); // Print the line
                }
                
                reader.close(); // Close the reader
            } catch (IOException e) {
                e.printStackTrace();
            }
        } else {
            System.out.println("File does not exist."); // If file doesn't exist
        }
    }
}
```

2. 文件写入：
```java
import java.io.File;
import java.io.IOException;

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

try (BufferedWriter writer = new BufferedWriter(new FileWriter(file)))) { // Using BufferedWriter for better performance when writing large amounts
            writer.write("This is a sample content written to the file."); // Write some sample content
            writer.newLine(); // Add a line break after content
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
```

注意：在运行这些示例时，请确保替换`path_to_your_file.txt`为实际的文件路径。