笔记.md

关于日志

1. pom文件

   1. slf4j-api
   2. slf4j-log4j12
   3. lombok
   4. sl4j-simple 在main中注意去掉scope

2. 在resources下新建的日志记录文件

   # Set root logger level to error
   log4j.rootLogger=INFO, Console, File
   
   ###### Console appender definition #######
   
   # All outputs currently set to be a ConsoleAppender.
   log4j.appender.Console=org.apache.log4j.ConsoleAppender
   log4j.appender.Console.layout=org.apache.log4j.PatternLayout
   log4j.appender.Console.layout.ConversionPattern=%d{ABSOLUTE} %-5p [%c{3}] %m%n
   #log4j.appender.Console.layout.ConversionPattern=%d{ABSOLUTE} %-5p [%c] %m%n
   
   ###### File appender definition #######
   log4j.appender.File=org.apache.log4j.DailyRollingFileAppender
   log4j.appender.File.File=spring.log
   log4j.appender.File.Append=false
   log4j.appender.File.layout=org.apache.log4j.PatternLayout
   log4j.appender.File.layout.ConversionPattern=%d{ABSOLUTE} %-5p [%c] %m%n

关于加载配置文件

1. main方法中

   由于main方法是静态方法，所以需要使用

   类名.class.getClassLoader().getResourcesAsStream("properties.properteis");

   eg:

   public static void main(String[] args) throws IOException {
           Logger logger = LoggerFactory.getLogger(App.class.getClass());
           Properties properties = new Properties();
           InputStream inputStream = App.class.getClassLoader().getResourceAsStream("properties.properties");
           properties.load(inputStream);
           List<String> list = new ArrayList<>();
           list.add("username");
           list.add("password");
           for (String key : list) {
               Object o = properties.get(key);
               logger.info("param is : {}, valaue is : {}", key, o);
           }
       }

2. 在非静态方法中

   使用this.getClass().getResourcesAsStream("properties.properties");

   即可， eg：

   public void loadProperties(String filename, List<String> param) throws IOException {
           Properties properties = new Properties();
           InputStream inputStream = this.getClass().getResourceAsStream(filename);
           properties.load(inputStream);
           for (String key : param) {
               Object o = properties.get(key);
               log.info("param is : {}, valaue is : {}", key, o);
           }
       }