求助：调用REST接口返回XML格式响应如何编写对应Java映射类

方案1：基于JAXB（Java官方标准实现） #

依赖说明 #

JDK 8及以下版本JAXB为内置组件无需额外引入，JDK 9+需在pom.xml中添加如下依赖：

<!-- JAXB依赖 -->
<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-impl</artifactId>
    <version>2.3.1</version>
    <scope>runtime</scope>
</dependency>

对应Java类代码 #

1. 根节点对应类

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

@XmlRootElement(name = "aname")
public class Aname {
    private Bname bname;

    @XmlElement(name = "bname")
    public Bname getBname() {
        return bname;
    }

    public void setBname(Bname bname) {
        this.bname = bname;
    }
}

2. 节点对应类

import javax.xml.bind.annotation.XmlElement;

public class Bname {
    private C c;

    @XmlElement(name = "c")
    public C getC() {
        return c;
    }

    public void setC(C c) {
        this.c = c;
    }
}

3. 节点对应类

import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;

public class C {
    private String id;
    private Cname cname;
    private Acc acc;

    @XmlAttribute(name = "id")
    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    @XmlElement(name = "cname")
    public Cname getCname() {
        return cname;
    }

    public void setCname(Cname cname) {
        this.cname = cname;
    }

    @XmlElement(name = "acc")
    public Acc getAcc() {
        return acc;
    }

    public void setAcc(Acc acc) {
        this.acc = acc;
    }
}

4. 节点对应类

import javax.xml.bind.annotation.XmlAttribute;

public class Cname {
    private String call;
    private String text;
    private String email;

    @XmlAttribute(name = "call")
    public String getCall() {
        return call;
    }

    public void setCall(String call) {
        this.call = call;
    }

    @XmlAttribute(name = "text")
    public String getText() {
        return text;
    }

    public void setText(String text) {
        this.text = text;
    }

    @XmlAttribute(name = "email")
    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }
}

5. 节点对应类

import javax.xml.bind.annotation.XmlElement;

public class Acc {
    private Accinfo accinfo;

    @XmlElement(name = "accinfo")
    public Accinfo getAccinfo() {
        return accinfo;
    }

    public void setAccinfo(Accinfo accinfo) {
        this.accinfo = accinfo;
    }
}

6. 节点对应类

import javax.xml.bind.annotation.XmlAttribute;

public class Accinfo {
    private String name;
    private String addr;

    @XmlAttribute(name = "name")
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @XmlAttribute(name = "addr")
    public String getAddr() {
        return addr;
    }

    public void setAddr(String addr) {
        this.addr = addr;
    }
}

反序列化示例代码 #

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import java.io.StringReader;

// xmlStr为REST接口返回的XML字符串
JAXBContext jaxbContext = JAXBContext.newInstance(Aname.class);
Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
Aname result = (Aname) unmarshaller.unmarshal(new StringReader(xmlStr));

方案2：基于Jackson XML（Spring生态推荐，适配REST接口场景） #

依赖说明 #

Spring Boot项目只需在pom.xml中添加如下依赖：

<dependency>
    <groupId>com.fasterxml.jackson.dataformat</groupId>
    <artifactId>jackson-dataformat-xml</artifactId>
</dependency>

注解适配说明 #

只需将上述JAXB注解替换为Jackson XML对应注解即可：

• 根节点用@JacksonXmlRootElement(localName = "节点名")
• XML属性用@JacksonXmlProperty(isAttribute = true, localName = "属性名")
• 子节点用@JacksonXmlProperty(localName = "节点名")
  配置完成后，RestTemplate、WebClient均可直接支持XML响应的自动反序列化。

内容的提问来源于stack exchange，提问作者user7723264