Java文件I/O操作：读写文件流示例

原创我不是女神ヾ 2024-09-20 01:27 66阅读 0赞

在Java中，我们可以使用FileInputStream和FileOutputStream来进行文件的读写操作。以下是一些基本的示例：

1. **读文件**：
```java
import java.io.File;
import java.io.FileInputStream;

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
            FileInputStream fis = new FileInputStream(file);
            
            try {
                byte data[] = new byte[1024]; // read in chunks to avoid memory issues
                int count;

while ((count = fis.read(data))) != -1) { // loop until end of file
                    System.out.print(new String(data, 0, count)) + " "); // print chunk of data
                }

} catch (Exception e) {
                e.printStackTrace();
            } finally {
                if (fis != null) {
                    fis.close(); // close FileInputStream to free up resources
                }
            }
        } else {
            System.out.println("File does not exist.");
        }
    }
}
```

2. **写文件**：
```java
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;

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

try (FileWriter writer = new FileWriter(file)) { // create FileWriter and write to it
            writer.write("Hello, World!\n"); // write string to file
        } catch (IOException e) {
            e.printStackTrace();
            System.out.println("Error writing to file.");
        }
    }
}
```

注意：在实际操作中，你需要替换文件路径为你想要写入或读取的文件的实际位置。