從HTTP如何獲取XML值獲得的Java

Question

響應我有一個Java Web服務，使一個GET請求並期望一個XML響應：

我的示例代碼如下所示。但是，我無法從響應中消費或獲取xml值。

代碼：

import java.io.BufferedReader; 
import java.io.IOException; 
import java.io.InputStreamReader; 
import java.net.HttpURLConnection; 
import java.net.URL; 
import java.net.URLEncoder; 
import javax.jws.WebService; 
import javax.jws.WebMethod; 
import javax.jws.WebParam; 

@WebService(serviceName = "send") 
public class send { 

    @WebMethod(operationName = "recieveFromPhpPortal") 
    public String recieveFromPhpPortal(@WebParam(name = "name") String DATE, String MSISDN, String PIN) throws IOException { 

     // Step 1: Construct URL" 
     String parameters = "VENDOR=D-MXXX&REQTYPE=EXRCTRFREQ&DATA=<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" 
       + "   <ns0:COMMAND\n" 
       + "    xmlns:ns0=\"http://safaricom.co.ke/Pinless/keyaccounts/\">\n" 
       + "    <ns0:TYPE>EXRCTRFREQ</ns0:TYPE>\n" 
       + "    <ns0:DATE>" + DATE + "</ns0:DATE>\n" 
       + "    <ns0:EXTNWCODE>SA</ns0:EXTNWCODE>\n" 
       + "    <ns0:MSISDN>" + MSISDN + "</ns0:MSISDN>\n" 
       + "    <ns0:PIN>" + PIN + "</ns0:PIN>\n" 
       + "   </ns0:COMMAND>"; 

     String url = "http://xx.xx.xx.xx/?" + URLEncoder.encode(parameters, "UTF-8"); 

     // Step 2: Call API Url 
     try { 
      URL obj = new URL(url); 
      HttpURLConnection con = (HttpURLConnection) obj.openConnection(); 
      con.setRequestMethod("GET"); 

      int responseCode = con.getResponseCode(); 
      System.out.println("\nSending 'GET' request to URL : " + url); 
      System.out.println("Response Code : " + responseCode); 

      // Step 3: Check the response status 
      if (responseCode == 200) { 
       //If response status == 200 
       System.out.println("The XML HAS been SENT!"); 
       System.out.println("Response Message : " + con.getResponseMessage()); 

       BufferedReader in = new BufferedReader(
         new InputStreamReader(con.getInputStream())); 
       String inputLine; 
       StringBuffer response = new StringBuffer(); 

       while ((inputLine = in.readLine()) != null) { 
        response.append(inputLine); 
       } 
       in.close(); 
       //print result 
       System.out.println(response.toString()); 
       //How do I get the XML response and insert into a database 

      } else { 
       // print the error received from server 
       System.out.println("Error in accessing API - " +responseCode); 
      } 
     } catch (Exception e) { 
      throw e; 
     } 

     return "Request Received by the webservice For Processing"; 
    } 
} 

我System.out.println(response.toString());後獲取XML響應：

<?xml version="1.0"?> 
<COMMAND> 
    <TYPE>EXRCTRFRESP</TYPE>    
    <TXNSTATUS>Transaction Status</TXNSTATUS > 
    <DATE>Date and time</DATE> 
    <EXTREFNUM>Unique</EXTREFNUM> 
    <TXNID><PreTUPS Transaction ID></TXNID> 
    <MESSAGE>Transaction Message</MESSAGE> 
</COMMAND> 

有人請告訴我如何，我可以從響應獲取數據，並保存在數據庫或至少獲取這些響應值TYPE,EXTREFNUM,MESSAGE。

問候。

Answer 1

您需要使用內置的java庫org.w3c.dom。下面是簡單的例子：

import javax.xml.parsers.DocumentBuilderFactory; 
import javax.xml.parsers.DocumentBuilder; 
import org.w3c.dom.Document; 
import org.w3c.dom.NodeList; 
import org.w3c.dom.Node; 
import org.w3c.dom.Element; 
import java.io.File; 

public class ReadXMLFile { 

    public static void main(String argv[]) { 

    try { 

    File fXmlFile = new File("staff.xml"); 
    DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance(); 
    DocumentBuilder dBuilder = dbFactory.newDocumentBuilder(); 
    Document doc = dBuilder.parse(fXmlFile); 

    System.out.println("Root element :" + doc.getDocumentElement().getNodeName()); 

    NodeList nList = doc.getElementsByTagName("staff"); 

    System.out.println("----------------------------"); 

    for (int temp = 0; temp < nList.getLength(); temp++) { 

     Node nNode = nList.item(temp); 

     System.out.println("\nCurrent Element :" + nNode.getNodeName()); 

     if (nNode.getNodeType() == Node.ELEMENT_NODE) { 

      Element eElement = (Element) nNode; 

      System.out.println("Staff id : " + eElement.getAttribute("id")); 
      System.out.println("First Name : " + eElement.getElementsByTagName("firstname").item(0).getTextContent()); 
      System.out.println("Last Name : " + eElement.getElementsByTagName("lastname").item(0).getTextContent()); 
      System.out.println("Nick Name : " + eElement.getElementsByTagName("nickname").item(0).getTextContent()); 
      System.out.println("Salary : " + eElement.getElementsByTagName("salary").item(0).getTextContent()); 

     } 
    } 
    } catch (Exception e) { 
    e.printStackTrace(); 
    } 
    } 

} 

而且staff.xml文件是：

<?xml version="1.0"?> 
<company> 
    <staff id="1001"> 
     <firstname>yong</firstname> 
     <lastname>mook kim</lastname> 
     <nickname>mkyong</nickname> 
     <salary>100000</salary> 
    </staff> 
    <staff id="2001"> 
     <firstname>low</firstname> 
     <lastname>yin fong</lastname> 
     <nickname>fong fong</nickname> 
     <salary>200000</salary> 
    </staff> 
</company>