Java中的IO操作，如文件读写实例-蒲公英云

Java中的IO操作，如文件读写实例

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：

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();
        }
    }
}