基于JAX-WS的RESTful web服务返回通过JAXB注解生成的xml文档

基于JAX-WS编写的RESTful web服务，返回xml文档。这个xml文档可以基于JAXB注解的形式来生成，简化xml的生成。

例如，下面RegisterResponse 这个类使用了JAXB的注解：

package com.thb.server.register;

import jakarta.xml.bind.annotation.XmlElement;
import jakarta.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "response")
public class RegisterResponse {

    @XmlElement(name = "flag")
    private int functionCode;

    @XmlElement(name = "body")
    private String enterpriseId;

    public RegisterResponse() {}

    public RegisterResponse(int functionCode, String enterpriseId) {
        this.functionCode = functionCode;
        this.enterpriseId = enterpriseId;
    }
}

对应生成的xml文档的形式：

<response>
	<flag>1</flag>
	<body>20012</body>
</response>

下面是服务端完整的示例代码：

package com.thb.server.register;

import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;

import jakarta.xml.bind.JAXBContext;
import jakarta.xml.bind.JAXBException;
import jakarta.xml.bind.Marshaller;
import jakarta.xml.ws.BindingType;
import jakarta.xml.ws.Provider;
import jakarta.xml.ws.WebServiceProvider;
import jakarta.xml.ws.http.HTTPBinding;
import jakarta.xml.ws.http.HTTPException;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;

@WebServiceProvider
@BindingType(value=HTTPBinding.HTTP_BINDING)
public class Register implements Provider<Source> {

    public Source invoke(Source source) {
        try {
            return createSource();
        } catch(Exception e) {
            e.printStackTrace();
            throw new HTTPException(500);
        }
    }

    private Source createSource() throws JAXBException {
        JAXBContext context = JAXBContext.newInstance(RegisterResponse.class);
        Marshaller marshaller = context.createMarshaller();
        ByteArrayOutputStream  outputStream = new ByteArrayOutputStream();
        marshaller.marshal(new RegisterResponse(1, "20012"), outputStream);
        byte[] bytes = outputStream.toByteArray();
        ByteArrayInputStream inputStream = new ByteArrayInputStream(bytes);
        Source source = new StreamSource(inputStream);

        return source;
    }
    
}

package com.thb.server.register;

import jakarta.xml.bind.annotation.XmlElement;
import jakarta.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "response")
public class RegisterResponse {

    @XmlElement(name = "flag")
    private int functionCode;

    @XmlElement(name = "body")
    private String enterpriseId;

    public RegisterResponse() {}

    public RegisterResponse(int functionCode, String enterpriseId) {
        this.functionCode = functionCode;
        this.enterpriseId = enterpriseId;
    }
}

部署的web服务的web.xml文件：

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="6.0" xmlns="https://jakarta.ee/xml/ns/jakartaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="https://jakarta.ee/xml/ns/jakartaee https://jakarta.ee/xml/ns/jakartaee/web-app_6_0.xsd">
    <description>power-restful</description>
    <display-name>power-restful</display-name>
    <listener>
        <listener-class>com.sun.xml.ws.transport.http.servlet.WSServletContextListener</listener-class>
    </listener>
    <servlet>
        <description>The JAX-WS dispatcher servlet</description>
        <display-name>dispatcher</display-name>
        <servlet-name>dispatcher</servlet-name>
        <servlet-class>com.sun.xml.ws.transport.http.servlet.WSServlet</servlet-class>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>dispatcher</servlet-name>
        <url-pattern>/register/*</url-pattern>
    </servlet-mapping>
    <session-config>
        <session-timeout>60</session-timeout>
    </session-config>
</web-app>

sun-jaxws.xml文件：

<?xml version="1.0" encoding="UTF-8"?>

<endpoints
    xmlns="http://java.sun.com/xml/ns/jax-ws/ri/runtime"
    version="2.0">

    <endpoint
        name="restful-register"
        implementation="com.thb.server.register.Register"
        url-pattern="/register/*" />
</endpoints>

部署到Tomcat容器中该web应用的目录布局：

D:\APACHE-TOMCAT-10.1.13\WEBAPPS\POWER-RESTFUL
├─META-INF
│      MANIFEST.MF
│      war-tracker
│      
└─WEB-INF
    │  sun-jaxws.xml
    │  web.xml
    │  
    ├─classes
    │  └─com
    │      └─thb
    │          └─server
    │              └─register
    │                      Register.class
    │                      RegisterResponse.class
    │                      
    └─lib
            angus-activation-1.0.0.jar
            angus-mail-1.0.0.jar
            FastInfoset-2.1.0.jar
            gmbal-api-only-4.0.3.jar
            ha-api-3.1.13.jar
            jakarta.activation-api-2.1.0.jar
            jakarta.annotation-api-2.1.1.jar
            jakarta.mail-api-2.1.0.jar
            jakarta.xml.bind-api-4.0.0.jar
            jakarta.xml.soap-api-3.0.0.jar
            jakarta.xml.ws-api-4.0.0.jar
            jaxb-core-4.0.0.jar
            jaxb-impl-4.0.0.jar
            jaxws-rt-4.0.0.jar
            log4j-api-2.20.0.jar
            log4j-core-2.20.0.jar
            management-api-3.2.3.jar
            mimepull-1.10.0.jar
            saaj-impl-3.0.0.jar
            stax-ex-2.1.0.jar
            stax2-api-4.2.1.jar
            streambuffer-2.1.0.jar
            woodstox-core-6.2.8.jar