从InputStream到String_写成函数

 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;

     }