1.亂碼  先讀出 所有的位元組碼 然後在轉換成 需要的字串
正確方式：
 ByteArrayOutputStream outHtml = new ByteArrayOutputStream(); 
 InputStream inn =  conn.getInputStream();
 byte[] buffer = new byte[1024];  
 int len = 0;
 while((len = inn .read(buffer))!= -1 ){
outHtml.write(buffer,0,len);
 }
 byte[] data = outHtml.toByteArray();
 logger.info("轉換前utf-8:"+new String(data,"utf-8")); 

錯誤方式： 是什麼導致的亂碼呢  為啥本地環境不亂碼 到執行環境就亂碼呢  難道僅僅是因為 可能讀取不全位元組 轉string 時出現的轉碼錯誤？ 

 InputStream inn =  conn.getInputStream();
 InputStream inputStream = new BufferedInputStream(inn);  
 StringBuffer htmlContent = new StringBuffer();  
 byte[] b = new byte[1024];  
 for (int n; (n = inputStream.read(b)) != -1;) {  
htmlContent.append(new String(b, 0, n,"utf-8"));  
 }  
 logger.info("獲取時："+htmlContent.toString());