Java

类型转换：

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();