How to do a SOAP Web Service call from Java class

Question

I m relative new to the webservices world and my research seems to have confused me more than enlighten me  my problem is that I was given a library jar  which I have to extend with some webservice functionality   This library will be shared to other developers  and among the classes in the jar will be classes that have a method which calls a webservice  that essentially sets an attribute of the class  does some business logic  like storing the object in a db  etc and sends back the object with those modifications   I want to make the call to this service as simple as possible  hopefully as simple so that the developer using the class only need to do   Car c   new Car  Blue    c webmethod      I have been studying JAX-WS to use on the server but seems to me that I don t need to create a wsimport in the server nor the wsimport on the client  since I know that both have the classes  I just need some interaction between classes shared in both the server and the client  How do you think makes sense to do the webservice and the call in the class

User · Answer

Or just use Apache CXF s wsdl2java to generate objects you can use   It is included in the binary package you can download from their website  You can simply run a command like this       wsdl2java -p com mynamespace for the api objects -autoNameResolution http   www someurl com DefaultWebService wsdl   It uses the wsdl to generate objects  which you can use like this  object names are also grabbed from the wsdl  so yours will be different a little    DefaultWebService defaultWebService   new DefaultWebService    String res   defaultWebService getDefaultWebServiceHttpSoap11Endpoint   login  webservice   dadsadasdasd    System out println res     There is even a Maven plug-in which generates the sources  https   cxf apache org docs maven-cxf-codegen-plugin-wsdl-to-java html  Note  If you generate sources using CXF and IDEA  you might want to look at this  https   stackoverflow com a 46812593 840315

User · Answer

I understand your problem boils down to how to call a SOAP  JAX-WS  web service from Java and get its returning object  In that case  you have two possible approaches    Generate the Java classes through wsimport and use them  or Create a SOAP client that    Serializes the service s parameters to XML  Calls the web method through HTTP manipulation  and Parse the returning XML response back into an object      About the first approach  using wsimport    I see you already have the services   entities or other  business classes  and it s a fact that the wsimport generates a whole new set of classes  that are somehow duplicates of the classes you already have    I m afraid  though  in this scenario  you can only either    Adapt  edit  the wsimport generated code to make it use your business classes  this is difficult and somehow not worth it - bear in mind everytime the WSDL changes  you ll have to regenerate and readapt the code   or Give up and use the wsimport generated classes   In this solution  you business code could  use  the generated classes as a service from another architectural layer     About the second approach  create your custom SOAP client    In order to implement the second approach  you ll have to    Make the call    Use the SAAJ  SOAP with Attachments API for Java  framework  see below  it s shipped with Java SE 1 6 or above  to make the calls  or You can also do it through java net HttpUrlconnection  and some java io handling    Turn the objects into and back from XML    Use an OXM  Object to XML Mapping  framework such as JAXB to serialize deserialize the XML from into objects Or  if you must  manually create parse the XML  this can be the best solution if the received object is only a little bit differente from the sent one      Creating a SOAP client using classic java net HttpUrlConnection is not that hard  but not that simple either   and you can find in this link a very good starting code   I recommend you use the SAAJ framework      SOAP with Attachments API for Java  SAAJ  is mainly used for dealing directly with SOAP Request Response messages which happens behind the scenes in any Web Service API  It allows the developers to directly send and receive soap messages instead of using JAX-WS    See below a working example  run it   of a SOAP web service call using SAAJ  It calls this web service   import javax xml soap     public class SOAPClientSAAJ           SAAJ - SOAP Client Testing     public static void main String args                             The example below requests from the Web Service at               https   www w3schools com xml tempconvert asmx op CelsiusToFahrenheit               To call other WS  change the parameters below  which are               - the SOAP Endpoint URL  that is  where the service is responding from               - the SOAP Action              Also change the contents of the method createSoapEnvelope   in this class  It constructs              the inner part of the SOAP envelope that is actually sent                      String soapEndpointUrl    https   www w3schools com xml tempconvert asmx           String soapAction    https   www w3schools com xml CelsiusToFahrenheit            callSoapWebService soapEndpointUrl  soapAction              private static void createSoapEnvelope SOAPMessage soapMessage  throws SOAPException           SOAPPart soapPart   soapMessage getSOAPPart             String myNamespace    myNamespace           String myNamespaceURI    https   www w3schools com xml                SOAP Envelope         SOAPEnvelope envelope   soapPart getEnvelope            envelope addNamespaceDeclaration myNamespace  myNamespaceURI                               Constructed SOAP Request Message               lt SOAP-ENV Envelope xmlns SOAP-ENV  http   schemas xmlsoap org soap envelope   xmlns myNamespace  https   www w3schools com xml   gt                   lt SOAP-ENV Header  gt                   lt SOAP-ENV Body gt                       lt myNamespace CelsiusToFahrenheit gt                           lt myNamespace Celsius gt 100 lt  myNamespace Celsius gt                       lt  myNamespace CelsiusToFahrenheit gt                   lt  SOAP-ENV Body gt               lt  SOAP-ENV Envelope gt                             SOAP Body         SOAPBody soapBody   envelope getBody            SOAPElement soapBodyElem   soapBody addChildElement  CelsiusToFahrenheit   myNamespace           SOAPElement soapBodyElem1   soapBodyElem addChildElement  Celsius   myNamespace           soapBodyElem1 addTextNode  100               private static void callSoapWebService String soapEndpointUrl  String soapAction            try                  Create SOAP Connection             SOAPConnectionFactory soapConnectionFactory   SOAPConnectionFactory newInstance                SOAPConnection soapConnection   soapConnectionFactory createConnection                    Send SOAP Message to SOAP Server             SOAPMessage soapResponse   soapConnection call createSOAPRequest soapAction   soapEndpointUrl                   Print the SOAP Response             System out println  Response SOAP Message                 soapResponse writeTo System out               System out println                 soapConnection close              catch  Exception e                System err println   nError occurred while sending SOAP Request to Server  nMake sure you have the correct endpoint URL and SOAPAction  n                e printStackTrace                         private static SOAPMessage createSOAPRequest String soapAction  throws Exception           MessageFactory messageFactory   MessageFactory newInstance            SOAPMessage soapMessage   messageFactory createMessage             createSoapEnvelope soapMessage            MimeHeaders headers   soapMessage getMimeHeaders            headers addHeader  SOAPAction   soapAction            soapMessage saveChanges                Print the request message  just for debugging purposes            System out println  Request SOAP Message             soapMessage writeTo System out           System out println   n             return soapMessage             About using JAXB for serializing deserializing  it is very easy to find information about it  You can start here  http   www mkyong com java jaxb-hello-world-example

User · Answer

I found a much simpler alternative way to generating soap message  Given a Person Object   import com fasterxml jackson annotation JsonInclude    JsonInclude JsonInclude Include NON NULL  public class Person     private String name    private int age    private String address    setter and getters below     Below is a simple Soap Message Generator   import com fasterxml jackson databind DeserializationFeature  import com fasterxml jackson databind ObjectMapper  import com fasterxml jackson databind SerializationFeature  import com fasterxml jackson datatype jsr310 JavaTimeModule  import lombok extern slf4j Slf4j  import org apache commons lang3 StringUtils  import com fasterxml jackson dataformat xml XmlMapper    Slf4j public class SoapGenerator      protected static final ObjectMapper XML MAPPER   new XmlMapper          enable DeserializationFeature READ UNKNOWN ENUM VALUES AS NULL         configure DeserializationFeature FAIL ON UNKNOWN PROPERTIES  false         configure SerializationFeature WRITE DATES AS TIMESTAMPS  false         registerModule new JavaTimeModule        private static final String SOAP BODY OPEN     lt soap Body gt      private static final String SOAP BODY CLOSE     lt  soap Body gt      private static final String SOAP ENVELOPE OPEN     lt soap Envelope xmlns soap   http   schemas xmlsoap org soap envelope    gt      private static final String SOAP ENVELOPE CLOSE     lt  soap Envelope gt       public static String soapWrap String xml        return SOAP ENVELOPE OPEN   SOAP BODY OPEN   xml   SOAP BODY CLOSE   SOAP ENVELOPE CLOSE         public static String soapUnwrap String xml        return StringUtils substringBetween xml  SOAP BODY OPEN  SOAP BODY CLOSE           You can use by    public static void main String   args  throws Exception          Person p   new Person            p setName  Test            p setAge 12            String xml   SoapGenerator soapWrap XML MAPPER writeValueAsString p            log info  Generated String            log info xml

[java] How to do a SOAP Web Service call from Java class?

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