【Java】Properties文件的解析

public abstract class ReadProperties {

    public ReadProperties() {}
    
    /**
     * 回调函数，由调用者处理
     * @param key
     * @param value
     */
    public abstract void dealKeyAndValue(String key, String value);
    
    /**
     * 根据包路径解析
     * @param packagePath
     * @throws IOException
     */
    public void read(String packagePath) throws IOException {
        InputStream is = this.getClass().getResourceAsStream(packagePath);
        read(is);
    }
    
    /**
     * 根据文件的绝对路径解析
     * @param absolutePath
     * @throws IOException
     */
    public void readFile(String absolutePath) throws IOException {
        read(new File(absolutePath));
    }
    
    /**
     * 根据{@link File}解析
     * @param file
     * @throws IOException
     */
    public void read(File file) throws IOException {
        read(new FileInputStream(file));
    }
    
    /**
     * 根据{@link InputStream}解析
     * @param is
     * @throws IOException
     */
    public void read(InputStream is) throws IOException {
        Properties properties = new Properties();
        try {
            // Properties文件会出现乱码问题，以UTF-8的方式打开
            properties.load(new InputStreamReader(is, "UTF-8"));
            Enumeration<Object> keys = properties.keys();
            
            while (keys.hasMoreElements()) {
                String key = (String) keys.nextElement();
                String value = properties.getProperty(key);
                properties.get(key);
                
                dealKeyAndValue(key, value);
            }
        } finally {
            is.close();
        }
    }
        
}

使用：
在src下新建一个test.properties文件如下：

执行解析：

public class Test {

    public static void main(String[] args) throws Exception {
        new ReadProperties() {
            @Override
            public void dealKeyAndValue(String key, String value) {
                System.out.println(key + " = " + value);
            }
        }.read("/test.properties");;
    }

}

结果如下：