Java 請求webServce接口 不帶參數

最近對接了個webService的接口取數據，從網上參差不齊的代碼中找到了個方法， 具體做者已經記不住是誰了，如今把代碼貼出來，但願能夠幫到你們，代碼以下，簡單粗暴

public String getWebService(){
        HttpURLConnection connection = null;
        OutputStream os = null;
        int responseCode = 0;
        StringBuilder sb = new StringBuilder();

        //第一步：建立服務地址，不是WSDL地址  
        URL url = null;
        try {
            url = new URL("");   //*****這裏填寫url地址
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }  
        //第二步：打開一個通向服務地址的鏈接  
        try {
            connection = (HttpURLConnection) url.openConnection();
            //第三步：設置參數  
            //3.1發送方式設置：POST必須大寫  
            connection.setRequestMethod("POST");
            //3.2設置數據格式：content-type  
            connection.setRequestProperty("content-type", "text/xml;charset=utf-8");  
            //3.3設置輸入輸出，由於默認新建立的connection沒有讀寫權限，  
            connection.setDoInput(true);  
            connection.setDoOutput(true);  
            os = connection.getOutputStream();  
            //第五步：接收服務端響應，打印  
            responseCode = connection.getResponseCode(); 

            String temp = null; 
            if(200 == responseCode){//表示服務端響應成功  
                InputStream is = connection.getInputStream();  
                InputStreamReader isr = new InputStreamReader(is);  
                BufferedReader br = new BufferedReader(isr);  
                while(null != (temp = br.readLine())){  
                    sb.append(temp);  
                }  
                System.out.println(sb.toString());  
                is.close();  
                isr.close();  
                br.close();  
            }
            os.close(); 
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }  

        return sb.toString();
    }