JAVA读取文件到内存

private static String getStringValue(File file) throws Exception{     InputStream in                 = new BufferedInputStream(new FileInputStream(file));      BufferedReader br             = new BufferedReader(new inputStreamReader(in));     String value = "";     StringBuffer sb = new StringBuffer();     sb.append("<root>\n");     while((value = br.readLine()) != null && !"".equals(value)) {             sb.append("<").append(value).append("></").append(value);             sb.append(">\n");     }                in.close();                br.close();                sb.append("</root>");                return sb.toString();}