Java 如何正确使用 Jackson 的 JaxbAnnotationIntrospector？
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How to use Hymanson's JaxbAnnotationIntrospector correctly?
提问by jbuhacoff
I'm able to generate the XML I want using @HymansonXmlProperty annotations with the default mapper configuration. But my classes are generated by maven-jaxb2-plugin and already have the @XmlAttribute annotations. When I try using the JaxbAnnotationIntrospector it serializes the attributes as child elements. What am I doing wrong?
我能够使用带有默认映射器配置的 @HymansonXmlProperty 注释生成我想要的 XML。但是我的类是由 maven-jaxb2-plugin 生成的，并且已经有了 @XmlAttribute 注释。当我尝试使用 JaxbAnnotationIntrospector 时，它将属性序列化为子元素。我究竟做错了什么？
Expected output: <problem xmlns="" id="aaa"><description>test</description></problem>(repeatable with testGenerateXmlCorrect)
预期输出：（<problem xmlns="" id="aaa"><description>test</description></problem>可与 testGenerateXmlCorrect 重复）
Actual output: <problem xmlns=""><id>aaa</id><description>test</description></problem>(repeatable with testGenerateXmlWrong)
实际输出：（<problem xmlns=""><id>aaa</id><description>test</description></problem>可与 testGenerateXmlWrong 重复）
I can also generate the expected XML using JAXB but this question is how to do it with Hymanson using the JaxbAnnotationIntrospector.
我也可以使用 JAXB 生成预期的 XML，但这个问题是如何使用 JaxbAnnotationIntrospector 与 Hymanson 一起做。
Junit test:
Junit测试：
import com.fasterxml.Hymanson.core.JsonProcessingException;
import com.fasterxml.Hymanson.dataformat.xml.XmlMapper;
import com.fasterxml.Hymanson.dataformat.xml.annotation.HymansonXmlProperty;
import com.fasterxml.Hymanson.dataformat.xml.annotation.HymansonXmlRootElement;
import com.fasterxml.Hymanson.module.jaxb.JaxbAnnotationIntrospector;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlRootElement;
import org.junit.Test;
public class JaxbAttributeTest {
private static final org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger(JaxbAttributeTest.class);
@XmlRootElement(name="problem")
public static class ProblemJaxb {
@XmlAttribute(name="id")
public String id;
public String description;
}
@Test
public void testGenerateXmlWrong() throws JsonProcessingException {
ProblemJaxb problem = new ProblemJaxb();
problem.id = "aaa";
problem.description = "test";
XmlMapper xmlMapper = new XmlMapper();
xmlMapper.setAnnotationIntrospector(new JaxbAnnotationIntrospector(xmlMapper.getTypeFactory()));
log.debug("ProblemJaxb: {}", xmlMapper.writeValueAsString(problem));
}
@HymansonXmlRootElement(localName="problem")
public static class ProblemHymanson {
@HymansonXmlProperty(isAttribute=true)
public String id;
public String description;
}
@Test
public void testGenerateXmlCorrect() throws JsonProcessingException {
ProblemHymanson problem = new ProblemHymanson();
problem.id = "aaa";
problem.description = "test";
XmlMapper xmlMapper = new XmlMapper();
log.debug("ProblemHymanson: {}", xmlMapper.writeValueAsString(problem));
}
}
Classpath includes:
类路径包括：
- com.fasterxml.Hymanson.core:Hymanson-core:jar:2.3.2
- com.fasterxml.Hymanson.core:Hymanson-annotations:jar:2.3.2
- com.fasterxml.Hymanson.core:Hymanson-databind:jar:2.3.2
- com.fasterxml.Hymanson.dataformat:Hymanson-dataformat-xml:jar:2.3.2
- com.fasterxml.Hymanson.module:Hymanson-module-jaxb-annotations:jar:2.3.2
- org.codehaus.woodstox:stax2-api:jar:3.1.1
- javax.xml.stream:stax-api:jar:1.0-2
- com.sun.xml.bind:jaxb-impl:jar:2.2.7
- com.sun.xml.bind:jaxb-core:jar:2.2.7
- javax.xml.bind:jaxb-api:jar:2.2.7
- com.fasterxml.Hymanson.core:Hymanson-core:jar:2.3.2
- com.fasterxml.Hymanson.core:Hymanson-annotations:jar:2.3.2
- com.fasterxml.Hymanson.core:Hymanson-databind:jar:2.3.2
- com.fasterxml.Hymanson.dataformat:Hymanson-dataformat-xml:jar:2.3.2
- com.fasterxml.Hymanson.module:Hymanson-module-jaxb-annotations:jar:2.3.2
- org.codehaus.woodstox:stax2-api:jar:3.1.1
- javax.xml.stream:stax-api:jar:1.0-2
- com.sun.xml.bind:jaxb-impl:jar:2.2.7
- com.sun.xml.bind:jaxb-core:jar:2.2.7
- javax.xml.bind:jaxb-api:jar:2.2.7
By the way I also tried configuring the XmlMapper with this:
顺便说一下，我还尝试使用以下配置 XmlMapper：
xmlMapper.getSerializationConfig().with(new JaxbAnnotationIntrospector(xmlMapper.getTypeFactory()));
but that generated even worse output because the root element name was incorrect: <ProblemJaxb xmlns=""><id>aaa</id><description>test</description></ProblemJaxb>
但这产生了更糟糕的输出，因为根元素名称不正确： <ProblemJaxb xmlns=""><id>aaa</id><description>test</description></ProblemJaxb>
采纳答案by Sotirios Delimanolis
It looks like this problem existed before, but was not reproducible by the writers of Hymanson. It doesn't seem like the bug report went very far.
看起来这个问题以前存在过，但Hyman逊的作家无法重现。错误报告似乎并没有走得太远。
I was able to solve the problem by using XmlJaxbAnnotationIntrospectorinstead of JaxbAnnotationIntrospector.
我能够通过使用XmlJaxbAnnotationIntrospector代替JaxbAnnotationIntrospector.
