Java的SpringMVC中控制器返回XML数据问题

<dependency>
    <groupId>javax.xml.bind</groupId>
    <artifactId>jaxb-api</artifactId>
    <version>2.3.1</version>
</dependency>
<dependency>
    <groupId>com.sun.xml.bind</groupId>
    <artifactId>jaxb-core</artifactId>
    <version>2.3.0.1</version>
</dependency>
<dependency>
    <groupId>com.sun.xml.bind</groupId>
    <artifactId>jaxb-impl</artifactId>
    <version>2.3.0.1</version>
</dependency>
<dependency>
    <groupId>javax.activation</groupId>
    <artifactId>activation</artifactId>
    <version>1.1.1</version>
</dependency>

<mvc:annotation-driven>
    <mvc:message-converters>
        <bean class="org.springframework.http.converter.xml.MarshallingHttpMessageConverter">
            <constructor-arg>
                <bean class="org.springframework.oxm.jaxb.Jaxb2Marshaller">
                    <property name="classesToBeBound">
                        <list>
                            <value>com.example.User</value>
                        </list>
                    </property>
                </bean>
            </constructor-arg>
        </bean>
    </mvc:message-converters>
</mvc:annotation-driven>

@RequestMapping(value = "/user", method = RequestMethod.GET)
@ResponseBody
public User getUser() {
    User user = new User();
    user.setId(1);
    user.setName("John Doe");
    user.setEmail("johndoe@example.com");
    return user;
}

<dependency>
    <groupId>com.thoughtworks.xstream</groupId>
    <artifactId>xstream</artifactId>
    <version>1.4.14</version>
</dependency>

<mvc:annotation-driven>
    <mvc:message-converters>
        <bean class="org.springframework.http.converter.xml.MarshallingHttpMessageConverter">
            <constructor-arg>
                <bean class="org.springframework.oxm.xstream.XStreamMarshaller">
                    <property name="autodetectAnnotations" value="true"/>
                </bean>
            </constructor-arg>
        </bean>
    </mvc:message-converters>
</mvc:annotation-driven>

@RequestMapping(value = "/user", method = RequestMethod.GET)
@ResponseBody
public User getUser() {
    User user = new User();
    user.setId(1);
    user.setName("John Doe");
    user.setEmail("johndoe@example.com");
    return user;
}

<dependency>
    <groupId>javax.ws.rs</groupId>
    <artifactId>javax.ws.rs-api</artifactId>
    <version>2.1.1</version>
</dependency>
<dependency>
    <groupId>org.glassfish.jersey.core</groupId>
    <artifactId>jersey-client</artifactId>
    <version>2.27</version>
</dependency>

<mvc:annotation-driven>
    <mvc:message-converters>
        <bean class="org.springframework.http.converter.xml.Jaxb2RootElementHttpMessageConverter"/>
    </mvc:message-converters>
</mvc:annotation-driven>

@RequestMapping(value = "/user", method = RequestMethod.GET)
@ResponseBody
public Response getUser() {
    User user = new User();
    user.setId(1);
    user.setName("John Doe");
    user.setEmail("johndoe@example.com");
    return Response.ok(user).build();
}

package com.example.controller;
import com.example.model.User;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.converter.xml.MarshallingHttpMessageConverter;
import org.springframework.oxm.jaxb.Jaxb2Marshaller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletResponse;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;```java
@RestController
public class UserController {
    @Resource
    private Jaxb2Marshaller jaxb2Marshaller;
    @RequestMapping(value = "/user", method = RequestMethod.GET, produces = MediaType.APPLICATION_XML_VALUE)
    @ResponseBody
    public User getUser(HttpServletResponse response) throws IOException, JAXBException {
        User user = new User();
        user.setId(1);
        user.setName("John Doe");
        user.setEmail("johndoe@example.com");
        // 使用 JAXB 将 Java 对象转换为 XML 格式的数据
        JAXBContext jaxbContext = JAXBContext.newInstance(User.class);
        Marshaller marshaller = jaxbContext.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        response.setContentType(MediaType.APPLICATION_XML_VALUE);
        marshaller.marshal(user, response.getWriter());
        return user;
    }
    @RequestMapping(value = "/users", method = RequestMethod.GET, produces = MediaType.APPLICATION_XML_VALUE)
    @ResponseBody
    public List<User> getUsers(HttpServletResponse response) throws IOException, JAXBException {
        List<User> users = new ArrayList<>();
        User user1 = new User();
        user1.setId(1);
        user1.setName("John Doe");
        user1.setEmail("johndoe@example.com");
        User user2 = new User();
        user2.setId(2);
        user2.setName("Jane Doe");
        user2.setEmail("janedoe@example.com");
        users.add(user1);
        users.add(user2);
        // 使用 Jaxb2Marshaller 将 Java 对象转换为 XML 格式的数据
        MarshallingHttpMessageConverter converter = new MarshallingHttpMessageConverter();
        converter.setMarshaller(jaxb2Marshaller);
        response.setContentType(MediaType.APPLICATION_XML_VALUE);
        converter.write(users, MediaType.APPLICATION_XML, response);
        return users;
    }
}