Java 请求webServce接口 不带参数

最近对接了个webService的接口取数据，从网上良莠不齐的代码中找到了个方法， 具体作者已经记不住是谁了，现在把代码贴出来，希望可以帮到大家，代码如下，简单粗暴

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

        //第一步：创建服务地址，不是WSDL地址
        URL url = null;
        try {
            url = new URL("");   //*****这里填写url地址
        } catch (MalformedURLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //第二步：打开一个通向服务地址的连接
        try {
            connection = (HttpURLConnection) url.openConnection();
            //第三步：设置参数
            //3.1发送方式设置：POST必须大写
            connection.setRequestMethod("POST");
            //3.2设置数据格式：content-type
            connection.setRequestProperty("content-type", "text/xml;charset=utf-8");
            //3.3设置输入输出，因为默认新创建的connection没有读写权限，
            connection.setDoInput(true);
            connection.setDoOutput(true);
            os = connection.getOutputStream();
            //第五步：接收服务端响应，打印
            responseCode = connection.getResponseCode(); 

            String temp = null;
            if(200 == responseCode){//表示服务端响应成功
                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();
    }