写入配置文件并读取值demo

package IO;
import java.io.*;
import java.util.Properties;

import javax.management.RuntimeErrorException;

public class PropertiesTest {

	/**
	 * @param args
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException {
		getAppCount();
	}

	public static void getAppCount() throws IOException {
		File config = new File("count.Properties");
		if (!config.exists()) {
			config.createNewFile();
		}
		FileInputStream fis = new FileInputStream(config);
		Properties prop = new Properties();
		prop.load(fis);
		String value = prop.getProperty("time");
		int count=0;
	
		if (value!=null) {
			count = Integer.parseInt(value);
			if (count>=10) {
				throw new RuntimeException("请注册！！！");				
			}
		}
		count++;
		int use=10-count;
		System.out.println("还有"+use+"次使用机会！！");
		prop.setProperty("time", count+"");
		FileOutputStream fos = new FileOutputStream(config);
		prop.store(fos, "");
		fos.close();
		fis.close();
	}

}