Explore the working principle of in -depth Javax XML SOAP API

Explore the working principle of in -depth Javax XML SOAP API Introduction: Javax XML SOAP API (referred to as SOAP API) is a protocol for network communication based on network communication. It allows applications to communicate with each other in different operating systems and platforms.SOAP API can be encapsulated in the XML format, so that applications of different languages and platforms can communicate and exchange information with each other.This article will explore the working principles of the Javax XML SOAP API, and provide some Java code examples to help readers better understand how they use. 1. What is soap? Soap (Simple Object Access Protocol, Simple Object Access Protocol) is a XML -based message protocol that is often used for distributed computing on the Internet.SOAP mainly uses the HTTP or HTTPS protocol as a communication protocol and encapsulates and transmits data through XML. 2. The working principle of SOAP API SOAP API is a set of standard Java and interfaces for creating and processing SOAP messages.It provides a simple way to build SOAP messages and send it to the remote server.The working principle of SOAP API is briefly introduced below: a. Create soap message Before using SOAP API, we first need to create a SOAP message.SOAP message consists of elements such as SOAP ENVELOPE, BODY, Header, similar to a XML document.With SOAP API, we can easily build these elements and add the required data. Assuming we want to call a remote web service to get weather information, we can create a SOAP message containing the "GetWeather" method.The following is an example code: // Create a SOAP message factory MessageFactory messageFactory = MessageFactory.newInstance(); // Create soap messages SOAPMessage soapMessage = messageFactory.createMessage(); // Get the envelope part of SOAP message SOAPPart soapPart = soapMessage.getSOAPPart(); // Get SOAP envelope SOAPEnvelope soapEnvelope = soapPart.getEnvelope(); // Get SOAP BODY SOAPBody soapBody = soapEnvelope.getBody(); // Create naming space and method name String namespaceURI = "http://www.example.com/weather"; String methodName = "getWeather"; // Create method call nodes SOAPElement methodElement = soapBody.addChildElement(methodName, "", namespaceURI); // Add method parameters SOAPElement cityElement = methodElement.addChildElement("city"); cityElement.addTextNode("Beijing"); The above code creates a SOAP message called "GetWeather" and adds a parameter called "City" with the parameter value of "Beijing". b. Send soap message After creating the SOAP message, we can send the message to the remote server through the SOAP API.This can be implemented by using SoapConnection and SOAPCONNECTIONFACTORY. The following is a sample code, demonstrating how to use SoapConnection to send SOAP messages: // Create SOAP connection factory SOAPConnectionFactory connectionFactory = SOAPConnectionFactory.newInstance(); // Create SOAP connection SOAPConnection connection = connectionFactory.createConnection(); // Specify the URL of the web service String endpointUrl = "http://www.example.com/weatherService"; // Send SOAP message and get response SOAPMessage response = connection.call(soapMessage, endpointUrl); // Treatment the response results // ... // Close SOAP connection connection.close(); The above code creates a SOAP connection and sends SOAP messages to the URL of the specified web service.We can then handle the results of the obtained response. 3. Summary This article deeply explores the working principle of the Javax XML SOAP API.We understand the basic concepts of the Soap protocol and learn how to create and send SOAP messages with SOAP API.Through the Javax XML SOAP API, we can easily build and process SOAP messages to achieve cross -platform and cross -language network communication. references: -Javax xml SOA and API document: https: //docs.oracle.com/en/java/javase/11/docs/api/java.xml.ws/javax/xml/ws/package-summary.html