怎么在servlet中返回一个字符串到一个JAVA类中

    public static String getURLContent(String para){
        String cont = null;
        InputStream reader = null;
        try {
            URL url = new URL(para);
            reader = url.openStream();
            int i;
            StringBuffer content = new StringBuffer();
            while((i = reader.read()) > -1) {
                content.append((char)i);
            }
            cont = content.toString();
            
        } catch (Exception e) {
            e.printStackTrace();
        }finally{
            try {
                reader.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        return cont;
    }