使用jaxb来生成多层嵌套xml

news/2024/11/17 4:41:48/

问题

需要生成多层嵌套xml，类似如下内容：

xml"><A><B><C><!-- C类的字段 --></C><C><!-- 另一个C类的字段 --></C></B>
</A>

解决

C.java

import jakarta.xml.bind.annotation.*;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
@XmlAccessorType(XmlAccessType.FIELD)
public class C {@XmlElement(nillable = true)private String field1;@XmlElement(nillable = true)private String field2;
}

这里使用到了lombok。注意这里需要设置@XmlAccessorType(XmlAccessType.FIELD)不然会出现：JAXB IllegalAnnotationException is thrown during parsing XML错误。

B.java

import jakarta.xml.bind.annotation.*;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
@XmlAccessorType(XmlAccessType.FIELD)
public class B {@XmlElement(name = "C")  // 指定 XML 标签名称private List<C> cList;
}

这里设置了一个数组标签。

A.java

import jakarta.xml.bind.annotation.*;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
@XmlRootElement
@XmlAccessorType(XmlAccessType.FIELD)
public class A {@XmlElement(name = "B")  // 指定 XML 标签名称private B b;
}

这里是根xml，所以，这里需要设置@XmlRootElement注解。

使用

	...StringWriter xmlWriter = new StringWriter();marshaller.marshal(uniteWorkReq, new StreamResult(xmlWriter));String xml = xmlWriter.toString();...

配置，依旧是如下方式注入：

@Beanpublic Jaxb2Marshaller marshaller() {Jaxb2Marshaller marshaller = new Jaxb2Marshaller();// this package must match the package in the <generatePackage> specified in// pom.xml
//        marshaller.setContextPath("com.cmdi.system.wsdl");marshaller.setPackagesToScan("com.xxx.xxxx.wsdl");return marshaller;}