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1. String --> InputStream
InputStream String2InputStream(String str){
   ByteArrayInputStream stream = new ByteArrayInputStream(str.getBytes());
   return stream;
}

2. InputStream --> String
String inputStream2String(InputStream is){
   BufferedReader in = new BufferedReader(new InputStreamReader(is));
   StringBuffer buffer = new StringBuffer();
   String line = "";
   while ((line = in.readLine()) != null){
     buffer.append(line);
   }
   return buffer.toString();
}