将Reader转为String

public void printReader(Reader reader){  BufferedReader r = new BufferedReader(reader);  StringBuffer sb = new StringBuffer();  String line;  try   {while((line=r.readLine())!=null) {  sb.append(line); sb.append("\r\n");}} catch (IOException e) {e.printStackTrace();}    sb.toString();    System.out.println(sb);}