使用http://www.webservicex.net與Java的Web服務

Question

有一個java servlet，它包含兩個帶貨幣縮寫的字符串變量。有外部JAX-WS服務http://www.webservicex.net/ws/WSDetails.aspx?CATID=2&WSID=10，它提供貨幣匯率。如何向此服務提出請求？如何向他發送這兩個字符串變量並返回數字？使用Eclipse EE Kepler，Tomcat 6

Answer 1

對於www.webservicex.net中的某些服務，您可以使用HTTP執行GET請求。例如：

protected void doGet(HttpServletRequest request, 
     HttpServletResponse response) throws ServletException, IOException { 

    String from = "USD"; 
    String to = "EUR"; 

    java.net.URL url = new java.net.URL(
      "http://www.webservicex.net/CurrencyConvertor.asmx" 
        + "/ConversionRate?FromCurrency=" + from 
        + "&ToCurrency=" + to); 
    java.util.Scanner sc = new java.util.Scanner(url.openStream()); 

    // <?xml version="1.0" encoding="utf-8"?> 
    sc.nextLine(); 

    // <double xmlns="http://www.webserviceX.NET/">0.724</double> 
    String str = sc.nextLine().replaceAll("^.*>(.*)<.*$", "$1"); 

    sc.close(); 

    Double rate = Double.parseDouble(str); 
    log("Rate: " + rate); 

}