Java实现读取和写入properties文件

cn=12
kr=14
jp=64

try (BufferedInputStream bis = new BufferedInputStream(new  FileInputStream("D:\\test\\data.properties"))) {
		int data = -1;
		while((data = bis.read()) != -1) {
			System.out.print((char)data);
		}
	} catch (IOException e) {
		e.printStackTrace();
	}
    运行结果
    // cn=12
    // kr=14
    // jp=64

// Properties格式文件的写入
    try (BufferedInputStream bis = new BufferedInputStream(new FileInputStream("D:\\test\\data.properties"))) {
		Properties props = new Properties();
		props.load(bis); // 将“输入流”加载至Properties集合对象中
		// 根据key，获取value
		System.out.println("cn");
	} catch (IOException e) {
		e.printStackTrace();
	}
    // 运行结果
    // cn=12

// Properties格式文件的写入
	try {
		Properties props = new Properties();
		props.put("F1", "2314");
		props.put("F2", "2341");
		props.put("F3", "5322");
		props.put("F4", "4316");
		// 使用“输出流”，将Properties集合中的KV键值对，写入*.properties文件
		try(BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("D:\\test\\demo.properties"))){
			props.store(bos, "just do IT");
		}
	} catch (IOException e) {
		e.printStackTrace();
	}

username=xm99
password=1234567

package proTest;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Properties;
public class proSavaTest {
    public static void main(String[] args) throws IOException {
        FileOutputStream out = new FileOutputStream("D:\\demo\\javaBase\\src\\proTest\\pro.properties");
        Properties pro = new Properties();
        pro.setProperty("username","xm99");
        pro.setProperty("passwd","12345");
        pro.store(out,"acb");
    }
}

package proTest;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;
public class proTest {
    public static void main(String[] args) throws IOException {
        FileInputStream in = new FileInputStream("D:\\demo\\javaBase\\src\\proTest\\pro.properties");
        Properties pro = new Properties();
        pro.load(in);
        String username = pro.getProperty("username");
        String passwd = pro.getProperty("passwd");
        System.out.println("username="+username);
        System.out.println("passwd="+passwd);
        in.close();
    }
}