学步园

public static String loadFileAsString(String filePath) throws java.io.IOException{
	    StringBuffer fileData = new StringBuffer(1000);
	    BufferedReader reader = new BufferedReader(new FileReader(filePath));
	    char[] buf = new char[1024];
	    int numRead=0;
	    while((numRead=reader.read(buf)) != -1){
	        String readData = String.valueOf(buf, 0, numRead);
	        fileData.append(readData);
	    }
	    reader.close();
	    return fileData.toString();
	}

	/*
	* Get the STB MacAddress
	*/
	public String getMacAddress(){
	    try {
	        return loadFileAsString("/sys/class/net/eth0/address")
	            .toUpperCase().substring(0, 17);
	    } catch (IOException e) {
	        e.printStackTrace();
	        return null;
	    }
	}