读取文件后写入文件

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.Properties;

public class Property {
    public static void main(String[] args) {
        Properties p = new Properties();
        int counter = 1;
        try {
            p.load(new FileInputStream("counter.txt"));
        } catch (Exception e) {
            p.setProperty("counter", String.valueOf(counter));
        }
        counter = Integer.parseInt(p.getProperty("counter"));
        System.out.println("第" + counter + "次运行");

        counter++;
        p.setProperty("counter", String.valueOf(counter));
        try {
            p.store(new FileOutputStream("counter.txt"),
                    "This software is runned counter:");// 第二个参数是对这个文件的注释，不支持中文的
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}