@RequestMapping(value = "/pic", method = {RequestMethod.POST, RequestMethod.GET}) 
    public String getContract(HttpServletRequest request, HttpServletResponse response) throws IOException {
      byte[] data = new byte[0];
    data = "一張圖片";
     OutputStream stream = response.getOutputStream();
                stream.write(data);
                stream.flush();
                stream.close();
                return "成功";
}

上面的方法，data是獲取一個圖片的字節(jié)數組，通過輸出流，可以顯示在頁面上，但是后的return "成功";返回到哪里去了呢？是被stream流覆蓋了嗎？