java如何实时动态获取properties文件的内容

import java.util.Properties; 

public class demo01 {
 
 public static String getCurrentPropertiesValue(String key,String filePath){
  String value="";
  Properties p = new Properties();
  try {
   //非实时动态获取
   //p.load(new InputStreamReader(this.class.getClassLoader().getResourceAsStream(filePath), "UTF-8"));
   //下面为动态获取
   String path = Thread.currentThread().getContextClassLoader().getResource("").getPath();
   InputStream is = new FileInputStream(path +File.separator+ filePath);
   p.load(is);
   value=p.getProperty(key);
  } catch (UnsupportedEncodingException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
  return value;
 }
}

// 默认编码(ISO-8859-1)读取属性文件, 中文乱码
@Test
public void test_properties_en() throws IOException{
 
 // 属性文件位置, 相对路径为class="lazy" data-src/main/resources 或 class="lazy" data-src/test/resources, 不能添加classpath:/前缀
 String propertyFileName = "jdbc.properties";
 
 // 获取字节流
 InputStream is = getClass().getClassLoader().getResourceAsStream(propertyFileName);
 
 // 创建属性文件, 并加载文件内容
 Properties properties = new Properties();
 properties.load(is); 
 String username = properties.getProperty("jdbc.username");
 String password = properties.getProperty("jdbc.password");
 System.out.println("username:" + username + ", password:" + password); 
}

// 指定读取文件编码方式,支持读取中文
@Test
public void test_properties_zh() throws IOException{
 
 // 属性文件位置, 相对路径为class="lazy" data-src/main/resources 或 class="lazy" data-src/test/resources, 不能添加classpath:/前缀
 String propertyFileName = "jdbc.properties";
 
 // 获取字节流
 InputStream is = getClass().getClassLoader().getResourceAsStream(propertyFileName);
 
 // 转换为UTF-8格式字符流
 InputStreamReader isr = new InputStreamReader(is, "UTF-8");
 
 // 创建属性文件, 并加载文件内容
 Properties properties = new Properties();
 properties.load(isr); 
 String username = properties.getProperty("jdbc.username");
 String password = properties.getProperty("jdbc.password");
 System.out.println("username:" + username + ", password:" + password); 
}

@Test
public void testRb_en() {
 // 资源配置文件,无须写文件后缀名, 默认寻找properties文件
 String bundleName = "jdbc";
 
 // 设置本地默认环境为英文环境
 Locale.setDefault(Locale.ENGLISH);
 
 // 指定加载
 ResourceBundle rb = ResourceBundle.getBundle(bundleName);
 
 String username = rb.getString("jdbc.username");
 String password = rb.getString("jdbc.password");
 System.out.println("username:" + username + ", password:" + password);
}

// 处理中文
@Test
public void testRb_zh() {
 // 资源配置文件,无须写文件后缀名, 默认寻找properties文件
 String bundleName = "jdbc";
 
 // 根据本地默认环境加载资源配置文件
 ResourceBundle rb = ResourceBundle.getBundle(bundleName); 
 String username = iso2Utf8(rb.getString("jdbc.username"));
 String password = iso2Utf8(rb.getString("jdbc.password"));
 System.out.println("username:" + username + ", password:" + password); 
}

private String iso2Utf8(String str) {
 if(null == str) return null;
 
 try {
  return new String(str.getBytes("ISO-8859-1"), "UTF-8");
 } catch (UnsupportedEncodingException e) {
  e.printStackTrace();
 }
 return null;
}

jdbc.username=张三
jdbc.password=123456

jdbc.username=张三
jdbc.password=123456

jdbc.username=zhangsan
jdbc.password=123456

public class JdbcProperty { 
 
 public static final String username;
 
 
 public static final String password;
 
 // 在Spring应用中,可借助注解或自定义注解进行自动装配,笔者此处只针对一般java应用
 static {
  
  // 加载属性文件
  ResourceBundle resourceBundle = ResourceBundle.getBundle("jdbc");
  
  // 初始化属性
  username = resourceBundle.getString("jdbc.username");
  password = resourceBundle.getString("jdbc.password");  
 }
}