Java中进行文件读写的基本策略_文件读取策略-优快云博客

本文详细介绍了如何使用Java代码从配置文件中加载参数，并根据这些参数更新日志输出的级别和路径。通过BufferedWriter和BufferedReader进行文件读写操作，实现了灵活的日志配置管理。

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BufferedWriter bw = null;
   BufferedReader br = null;
   try {
    Properties props = new Properties();
    URL cfgUrl = Loader.getResource("nauproject.properties");
    InputStream istream = new FileInputStream(new File(cfgUrl.getFile()));
    props.load(istream);
    istream.close();
    String logLevel = props.getProperty("log.apm.level");//ログ出力レベル
    String logFPath = props.getProperty("log.apm.file");//ログ出力パス
    bw = new BufferedWriter(new FileWriter(url.getFile()));
    br = new BufferedReader(new FileReader(url.getFile()));
    String value = null;
    while ((value = br.readLine()) != null) {
     if(value.trim().startsWith("#")) continue;
     if(value.trim().indexOf("${log.apm.level}") != -1)
      value = value.replace("${log.apm.level}", logLevel);
     if(value.indexOf("${log.apm.file}") != -1)
      value = value.replace("${log.apm.file}", logFPath);
     bw.write(value);
           bw.newLine();
           bw.flush(); 
    }
   } catch (Exception e) {
    e.printStackTrace();
   } finally {
    try {
     if(br != null)
      br.close();
     if(bw != null)
      bw.close();
    } catch (IOException e) {
     e.printStackTrace();
    }
   }