String result = readFromInputStream(inputStream);//调用处

 //将输入流InputStream变为String

     public String readFromInputStream(InputStream in) throws IOException {

         ByteArrayOutputStream baos = new ByteArrayOutputStream();

         byte[] buffer = new byte[1024];

         int len = -1;

         while ((len = in.read(buffer)) != -1) {

             baos.write(buffer, 0, len);

         }

         baos.close();

         in.close();

         byte[] lens = baos.toByteArray();

         String result = new String(lens,"UTF-8");//内容乱码处理

         return result;

     }