java项目中设置 System.getProperty（“XXX”）自定义变量

最新推荐文章于 2022-06-04 17:43:28 发布

原创最新推荐文章于 2022-06-04 17:43:28 发布 · 3.1k 阅读

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CC 4.0 BY-SA版权

本文介绍了一种在Java中加载和解析配置文件的方法，通过使用Properties类从不同路径读取配置信息，并处理可能的异常情况。

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 public static void main(String[] args) {
        String property = System.getProperty("config-dir");
        // D:\开源项目\demo_project\jfengTestProject01\src\main\resources\solver\config.properties
        Properties configProperties = getConfigProperties(property+"\\solver\\config.properties", false);
        System.out.println(configProperties);
    }

  private static Properties getConfigProperties(String confFilePath, boolean cp){
        Properties configProperties;
        configProperties = new Properties();
        InputStream is = null;
        String path = confFilePath;
        try{
            if(cp) {
                is = getResourceAsStream(confFilePath);
                path = getResource(confFilePath).toString();
            }else {
                is = new FileInputStream(confFilePath);
            }
            log.info("loading configruation from "+path);
            configProperties.load(is);
        }catch(IOException e){
            throw new RuntimeException("failed to load configuration from "+confFilePath);
        }finally {
            if(is != null) {
                try{is.close();}catch(IOException e) {log.error("failed to close input stream of "+path, e);}
            }
        }
        if(configProperties.isEmpty()){
            log.warn("nothing loaded from "+path);
        }
        return configProperties;
    }

    public static InputStream getResourceAsStream(String path){
        InputStream is = ClassLoader.getSystemClassLoader().getResourceAsStream(path);
        if(is == null){
            is = Thread.currentThread().getContextClassLoader().getResourceAsStream(path);
        }
        if(is == null) {
            throw new RuntimeException("resouce file not found. "+path);
        }
        return is;
    }

    public static URL getResource(String path){
        URL url = ClassLoader.getSystemClassLoader().getResource(path);
        if(url == null){
            url = Thread.currentThread().getContextClassLoader().getResource(path);
        }
        if(url == null) {
            throw new RuntimeException("resouce file not found. "+path);
        }
        return url;
    }