从 Spring Boot 控制器返回 JAXB 生成的元素 [英] Returning JAXB-generated elements from Spring Boot Controller
问题描述
我正在从 http://www.ncpdp.org 的 XSD 生成大量 Java 文件文件(仅对会员可用).生成它们后,我想在我的 Spring 控制器中使用它们,但是我在将响应转换为 XML 时遇到了问题.
I'm generating a plethora of Java files from http://www.ncpdp.org's XSD files (only available to members). After generating them, I'd like to use them in my Spring Controllers, but I'm having problems getting responses converted to XML.
我尝试返回元素本身以及 JAXBElement<T>,但似乎都不起作用.以下测试失败:
I've tried returning the element itself, as well as JAXBElement<T>, but neither seems to work. The test below fails:
java.lang.AssertionError: Status
Expected :200
Actual :406
@Test
public void testHelloWorld() throws Exception {
mockMvc.perform(get("/api/message")
.accept(MediaType.APPLICATION_XML)
.contentType(MediaType.APPLICATION_XML))
.andExpect(status().isOk())
.andExpect(content().contentType(MediaType.APPLICATION_XML));
}
这是我的控制器:
import org.ncpdp.schema.transport.MessageType;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class HelloWorldController {
@RequestMapping(value = "/api/message", method = RequestMethod.GET)
public MessageType messageType() {
return new MessageType();
}
}
我尝试创建一个 MvcConfig 来覆盖 Spring Boot 的 MVC 配置,但它似乎不起作用.
I've tried creating a MvcConfig to override Spring Boot's MVC config, but it doesn't seem to be working.
@Configuration
@EnableWebMvc
public class MvcConfig extends WebMvcConfigurerAdapter {
@Override
public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {
converters.add(marshallingHttpMessageConverter());
}
@Bean
public MarshallingHttpMessageConverter marshallingHttpMessageConverter() {
Jaxb2Marshaller jaxb2Marshaller = new Jaxb2Marshaller();
jaxb2Marshaller.setPackagesToScan(new String[]{"com.ncpdb.schema.transport"});
MarshallingHttpMessageConverter converter = new MarshallingHttpMessageConverter();
converter.setMarshaller(jaxb2Marshaller);
converter.setUnmarshaller(jaxb2Marshaller);
converter.setSupportedMediaTypes(Arrays.asList(MediaType.APPLICATION_XML));
return converter;
}
}
我需要做什么才能让 Spring MVC 将我生成的 JAXB 对象编组为 XML?
What do I need to do to get Spring MVC to marshall my generated JAXB objects as XML?
推荐答案
我能够通过在与我的模式相同的目录中创建 bindings.xjb 文件来解决这个问题.这会导致 JAXB 在类上生成 @XmlRootElement.
I was able to solve this by creating a bindings.xjb file in the same directory as my schemas. This causes JAXB to generate @XmlRootElement on classes.
<?xml version="1.0"?>
<jxb:bindings version="1.0"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:jxb="http://java.sun.com/xml/ns/jaxb"
xmlns:xjc="http://java.sun.com/xml/ns/jaxb/xjc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/jaxb http://java.sun.com/xml/ns/jaxb/bindingschema_2_0.xsd">
<jxb:bindings schemaLocation="transport.xsd" node="/xsd:schema">
<jxb:globalBindings>
<xjc:simple/>
</jxb:globalBindings>
</jxb:bindings>
</jxb:bindings>
要为返回的 XML 添加命名空间前缀,我必须修改 maven-jaxb2-plugin 以添加几个参数.
To add namespaces prefixes to the returned XML, I had to modify the maven-jaxb2-plugin to add a couple arguments.
<arg>-extension</arg>
<arg>-Xnamespace-prefix</arg>
并添加一个依赖项:
<dependencies>
<dependency>
<groupId>org.jvnet.jaxb2_commons</groupId>
<artifactId>jaxb2-namespace-prefix</artifactId>
<version>1.1</version>
</dependency>
</dependencies>
然后修改我的 bindings.xjb 以包含此内容:
Then modify my bindings.xjb to include this:
<?xml version="1.0"?>
<jxb:bindings version="1.0"
xmlns:xsd="http://www.w3.org/2001/XMLSchema"
xmlns:jxb="http://java.sun.com/xml/ns/jaxb"
xmlns:xjc="http://java.sun.com/xml/ns/jaxb/xjc"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:namespace="http://jaxb2-commons.dev.java.net/namespace-prefix"
xsi:schemaLocation="http://java.sun.com/xml/ns/jaxb http://java.sun.com/xml/ns/jaxb/bindingschema_2_0.xsd
http://jaxb2-commons.dev.java.net/namespace-prefix http://java.net/projects/jaxb2-commons/sources/svn/content/namespace-prefix/trunk/src/main/resources/prefix-namespace-schema.xsd">
<jxb:bindings schemaLocation="transport.xsd" node="/xsd:schema">
<jxb:globalBindings>
<xjc:simple/>
</jxb:globalBindings>
<jxb:schemaBindings>
<jxb:package name="org.ncpdp.schema.transport"/>
</jxb:schemaBindings>
<jxb:bindings>
<namespace:prefix name="transport"/>
</jxb:bindings>
</jxb:bindings>
</jxb:bindings>
我从 https://java.net/projects 学到了如何做到这一点/jaxb2-commons/pages/Namespace-prefix.我还发现了 http://blog.frankel.ch/customize-your-jaxb-bindings 是关于如何自定义 JAXB 绑定的好资源.
I learned how to do this from https://java.net/projects/jaxb2-commons/pages/Namespace-prefix. I also found http://blog.frankel.ch/customize-your-jaxb-bindings to be a good resource on how to customize JAXB bindings.
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