手动连接webservice

  webservice调用方式：

1.httpget

2.httpost

3.httpsoap

其中soap的优点是可以传递结构化的数据，前两者不行。

 

webservice的通讯原理是其底层也是通过http传输的。所以手动连接webservice server有两种方式。

第一种是使用jaxm

 

这种方法比较复杂，使用soapconnection

public static void post2WebService(String content, String url) {

    try {

      // First create the connection
      SOAPConnectionFactory soapConnFactory = SOAPConnectionFactory
          .newInstance();
      SOAPConnection connection = soapConnFactory.createConnection();

      // Next, create the actual message
      MessageFactory messageFactory = MessageFactory.newInstance();
      SOAPMessage message = messageFactory.createMessage();

      // Create objects for the message parts
      SOAPPart soapPart = message.getSOAPPart();
      SOAPEnvelope envelope = soapPart.getEnvelope();
      SOAPBody body = envelope.getBody();

      // String to inputstream
      InputStream inputstream = new ByteArrayInputStream(
          content.getBytes("UTF-8"));
      // Populate the Message
      StreamSource preppedMsgSrc = new StreamSource(inputstream);
      soapPart.setContent(preppedMsgSrc);
      // Save the message
      message.saveChanges();

      // Send the message and get a reply

      // Set the destination
      URLEndpoint destination = new URLEndpoint(url);
      // Send the message
      SOAPMessage reply = connection.call(message, destination);

      // Create the transformer
      TransformerFactory transformerFactory = TransformerFactory
          .newInstance();
      Transformer transformer = transformerFactory.newTransformer();
      // Extract the content of the reply
      Source sourceContent = reply.getSOAPPart().getContent();
      
      // Set the output for the transformation
      StringWriter writer = new StringWriter();
//      StreamResult result = new StreamResult(System.out);
      StreamResult result = new StreamResult(writer);
      transformer.transform(sourceContent, result);
      System.out.println("result : " + writer.toString());

      // Close the connection
      connection.close();

    } catch (Exception e) {
      LOG.error("post2WebService error : " + e.getMessage());
    }

  }

 

此处是一小段代码参考，如何将streamResult转换为String的

try {
    StreamSource source = new StreamSource(new StringReader("<xml>blabla</xml>"));
    StringWriter writer = new StringWriter();
    StreamResult result = new StreamResult(writer);
    TransformerFactory tFactory = TransformerFactory.newInstance();
    Transformer transformer = tFactory.newTransformer();
    transformer.transform(source,result);
    String strResult = writer.toString();
} catch (Exception e) {
    e.printStackTrace();
}

这里还需要使用到jaxm-api.jar

 

第一种方法较为复杂，现在介绍第二种方法，直接使用httpConnection post message

public static String sendPost2WS(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            //open url connect
            URLConnection conn = realUrl.openConnection();
            //set common properties
            conn.setRequestProperty("accept", "*/*");
            conn.setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            //send POST request must set 2 lins below
            conn.setDoOutput(true);
            conn.setDoInput(true);
            //get URLConnection object out put stream
            out = new PrintWriter(conn.getOutputStream());
            //send request parameters
            out.print(param);
            // flush out put stream cache
            out.flush();
            //define BufferedReader to get the URL response
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("send POST has error : "+e.getMessage());
            e.printStackTrace();
        }
        //close in & out put stream
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    }