java8中写入文件时如何设置每12秒写入一次

在Java 8中，如果你想要每12秒追加一次内容到文件，你可以利用定时任务（ScheduledExecutorService）配合FileWriter。这里有一个简单的示例说明如何实现这个功能[^1]：

import java.io.FileWriter;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class FileAppender {
    private ScheduledExecutorService executor;
    private FileWriter writer;
    
    public FileAppender(String filePath) {
        try {
            // 创建FileWriter并指定追加模式
            writer = new FileWriter(filePath, true);
            
            // 使用ScheduledExecutorService设置每12秒执行一次的任务
            executor = Executors.newSingleThreadScheduledExecutor();
            executor.scheduleAtFixedRate(() -> {
                String dataToAppend = "This content will be appended every 12 seconds.\n";
                writer.append(dataToAppend);
                writer.flush(); // 确保内容立即写入文件
            }, 0, 12, TimeUnit.SECONDS);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    // 可以添加关闭方法来终止任务和关闭writer
    public void shutdown() {
        executor.shutdown();
        try {
            if (!executor.awaitTermination(5, TimeUnit.SECONDS)) {
                executor.shutdownNow();
            }
        } catch (InterruptedException ie) {
            executor.shutdownNow();
        } finally {
            if (writer != null) {
                try {
                    writer.close();
                } catch (IOException ioe) {
                    System.err.println("Error closing file writer: " + ioe.getMessage());
                }
            }
        }
    }
}

创建`FileAppender`实例后，它会在每12秒自动向文件追加新的内容。记得在不再需要追加时调用`shutdown()`方法来停止任务。