读取和写入配置文件

1：读取.properties的配置文件：

java.util.Properties properties = new java.util.Properties();
InputStream in = Thread.currentThread().getContextClassLoader().getResourceAsStream("config/config.properties");

properties.load(in);

2：写入.properties配置文件：

properties.setProperty("aaa", "efefe");
FileOutputStream fos = new FileOutputStream("D:/workspace/config.properties");
properties.store(fos, "aaa");

3：读取.xml配置文件：

ClassPathXmlApplicationContext context= new ClassPathXmlApplicationContext("spring/beans.xml");
DataSourceTransactionManager data = (DataSourceTransactionManager)context.getBean("transactionManager")