HttpURLConnection 使用 方法內請求接口

HttpURLConnection 的使用:

HttpURLconnection是基於http協議的，支持get，post，put，delete等各種請求方式，最常用的就是get和post

做過微信支付的童鞋應該曉得這個東西.

利用HttpURLconnection去請求接口,從目標接口獲得返回數據.

 /**
	 * 方法內請求接口
	 * 
	 * @param reqMsg
	 * @return
	 * @throws Exception
	 */
	public Map<String,String> requirest(ISOMsg reqMsg) {
	    try {
			//創建鏈接
			URL httpUrl = new URL("http://XXX");
			//打開連接
            HttpURLConnection Connection = (HttpURLConnection) httpUrl.openConnection();
            Connection.setRequestMethod("POST");
            // 發送POST請求必須設置如下兩行
            Connection.setDoOutput(true);
            Connection.setDoInput(true);
            }
            Connection.connect();
            
            // 獲取URLConnection對象對應的輸出流
            PrintWriter printWriter = new PrintWriter(Connection.getOutputStream());
            // 發送請求參數
            printWriter.write("aa="+aa+"&bb="+bb);//post的參數 
            // flush輸出流的緩衝
            printWriter.flush();
            //開始獲取數據
            BufferedInputStream bis = new BufferedInputStream(Connection.getInputStream());
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            int len;
            byte[] arr = new byte[1024];
            while((len=bis.read(arr))!= -1){
                bos.write(arr,0,len);
                bos.flush();
            bos.close();
            String date = bos.toString("utf-8");//返回
            log.info("返回數據:"+date);
            //轉成json
            Object json =JSON.parse(date);  
	    //json轉map
            Map<String,String> map = (Map)json;
		} catch (Exception e) {
			e.printStackTrace();
		}
		return reqMsg;
	}