JavaProperties配置管理全解析

Properties props = new Properties();

props.setProperty("db.url", "jdbc:mysql://localhost:3306/mydb");

props.setProperty("db.user", "root");

props.setProperty("db.password", "123456");

String url = props.getProperty("db.url"); // 获取配置值

db.url=jdbc:mysql://localhost:3306/mydb

db.user=root

db.password=123456

app.name=MyApplication

Properties props = new Properties();

try (InputStream input = getClass().getClassLoader()

.getResourceAsStream("config.properties")) {

if (input == null) {

System.out.println("无法找到配置文件");

return;

}

props.load(input); // 加载配置

} catch (IOException ex) {

ex.printStackTrace();

}

String dbName = props.getProperty("app.name");

props.setProperty("app.version", "1.0.1");

try (OutputStream output = new FileOutputStream("config.properties")) {

props.store(output, "Updated configuration");

} catch (IOException e) {

e.printStackTrace();

}

String timeout = props.getProperty("app.timeout", "30"); // 默认30秒

int retryCount = Integer.parseInt(props.getProperty("app.retries", "3"));