Java backend development: API SOAP service management using Java Apache Axis

Java backend development: API SOAP service management using Java Apache Axis

In today's software development, APIs are inevitable. API provides an interface for interaction between different applications. An API is a way of expressing interfaces that allows developers to more easily integrate and extend different applications and services. SOAP (Simple Object Access Protocol) is an XML-based communication protocol that allows applications to exchange information through the HTTP protocol and supports cross-language and platform communication. Apache Axis is a Java SOAP framework developed by the Apache Foundation for building and deploying SOAP servers and clients.

In this article, we will discuss how to perform API management using the Apache Axis framework. We will explain it from the following aspects:

1. Install Apache Axis
2. Build SOAP Web service
3. Manage SOAP Web service
4. Call SOAP Web Service
5. Install Apache Axis

First, we need to install Apache Axis. Apache Axis provides two installation methods:

• Download and unzip the Apache Axis binary
• In a Java application, use Apache Maven or Gradle to add the Apache Axis dependency

If you choose to download and unpack Apache Axis, you can complete the installation by following these steps:

1. Visit the Apache Axis download page https://axis.apache.org/axis2/java/ core/download.cgi, select "Binary Distribution" to download.
2. Extract the downloaded zip file to your computer.
3. Environment variable settings: Set the AXIS2_HOME variable to point to the folder where Axis2 is installed.
4. Building a SOAP Web Service

Once Axis2 has been installed and configured, we can start building our API. The specific steps are as follows:

• Open your Java IDE (such as Eclipse) and create a new Java Web project.
• Create a new package in the src folder created by the project, naming method: com.example.api, and then create a new Java class file in the package and name it CalculatorService.
• Build the API: Build a simple API in the CalculatorService class as follows:

package com.example.api;

public class CalculatorService {
   
    public int add(int x, int y) {
        return x + y;
    }
 
    public int substract(int x, int y) {
        return x - y;
    }
}

3. Manage SOAP Web Service

Created After the web service, we can perform some management operations. For example, we need to pay attention to API deployment, service port configuration, etc. We can configure it in the services.xml file in the WEB-INF directory under the project root directory. The specific steps are as follows:

• Create the center "services.xml" file: Create the services.xml file in the WEB-INF directory under the root directory. This file indicates the name of the service resource file that the application contains to be published.
• Edit Center "services.xml" file: Configure web service information, including service name and its corresponding interface, port, etc. The following is a sample service:

<serviceGroup>
   <service>
      <parameter name="ServiceClass" locked="false">com.example.api.CalculatorService</parameter>
      <parameter name="ServiceName" locked="false">CalculatorService</parameter>
      <parameter name="XMLValidator" locked="false">org.apache.axis2.jaxws.description.impl.JAXWSAxisServiceBuilder</parameter>
      <operation>
         <parameter name="addOperation" locked="false">
            <messageReceiver class="org.apache.axis2.jaxws.server.JAXWSMessageReceiver" />
         </parameter>
         <parameter name="subOperation" locked="false">
            <messageReceiver class="org.apache.axis2.jaxws.server.JAXWSMessageReceiver" />
         </parameter>
      </operation>
      <module ref="soapmonitor" />
   </service>
</serviceGroup>

4. Call SOAP Web Service

Finally, we can call our API through the client program. The following is a simple Java client program that calls the Add method in the CalculatorService interface.

import org.apache.axis2.AxisFault;
import org.apache.axis2.addressing.EndpointReference;
import org.apache.axis2.client.Options;
import org.apache.axis2.rpc.client.RPCServiceClient;
import org.apache.axis2.transport.http.HTTPConstants;
import javax.xml.namespace.QName;
 
public class JavaWebServiceClient {
 
 public static void main(String[] args) {
     
     try {
         
         EndpointReference epr = new EndpointReference("http://localhost:8080/axis2/services/CalculatorService");
         
         RPCServiceClient serviceClient = new RPCServiceClient();
         Options options = serviceClient.getOptions();
         options.setProperty(HTTPConstants.CHUNKED, "false");
         
         QName name = new QName("http://api.example.com", "add"); 
         Object[] params = new Object[] {21, 45};
         Class[] paramTypes = new Class[] { Integer.class, Integer.class };
         
         Object[] response = serviceClient.invokeBlocking(name, params, paramTypes);
         
         if (response.length > 0 && response[0] != null) {
             System.out.println("Result: " + response[0]);
         }
         
     } catch (AxisFault axisFault) {
         axisFault.printStackTrace();
     }
 }
}

This article provides some basic knowledge about SOAP Web service development using the Java Apache Axis framework and introduces you to how to build, deploy and call a simple SOAP Web service. SOAP web services are an important part of building API-based enterprise applications. By using the Apache Axis framework, you can quickly and easily develop efficient SOAP web service applications.

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