我正在使用CXF rest客户端,它适用于简单的数据类型(例如:字符串,整数)。但是,当我尝试使用自定义对象时,我得到了这个:
Exception in thread "main" org.apache.cxf.interceptor.Fault: .No message body writer found for class : class com.company.datatype.normal.MyObject.
at org.apache.cxf.jaxrs.client.ClientProxyImpl$BodyWriter.handleMessage(ClientProxyImpl.java:523)
at org.apache.cxf.phase.PhaseInterceptorChain.doIntercept(PhaseInterceptorChain.java:263)
at org.apache.cxf.jaxrs.client.ClientProxyImpl.doChainedInvocation(ClientProxyImpl.java:438)
at org.apache.cxf.jaxrs.client.ClientProxyImpl.invoke(ClientProxyImpl.java:177)
at $Proxy13.execute(Unknown Source)
at com.company.JaxTestClient.main(JaxTestClient.java:26)
Caused by: org.apache.cxf.jaxrs.client.ClientWebApplicationException: .No message body writer found for class : class com.company.datatype.normal.MyObject.
at org.apache.cxf.jaxrs.client.AbstractClient.reportMessageHandlerProblem(AbstractClient.java:491)
at org.apache.cxf.jaxrs.client.AbstractClient.writeBody(AbstractClient.java:401)
at org.apache.cxf.jaxrs.client.ClientProxyImpl$BodyWriter.handleMessage(ClientProxyImpl.java:515)
... 5 more
我这样称呼它:
JaxExample jaxExample = JAXRSClientFactory.create( "http://localhost:8111/", JaxExample.class );
MyObject before = ...
MyObject after = jaxExample.execute( before );
这是界面中的方法:
@POST
@Path( "execute" )
@Produces( "application/json" )
MyObject execute( MyObject myObject );
restlet库通过将XStream依赖项添加到您的“正常工作”的路径,非常简单。 CXF有类似之处吗?
编辑#1:
我已将此作为功能改进发布到CXF问题管理系统here。我只能希望这会得到照顾。
它不是开箱即用,但CXF确实支持JSON绑定到休息服务。请参阅cxf jax-rs json docs here.您仍需要进行一些最小配置才能使提供程序可用,如果您想要更好地控制JSON的形成方式,则需要熟悉jettison。
编辑:每个评论请求,这里是一些代码。我对此没有太多经验,但以下代码在快速测试系统中作为示例。
//TestApi parts
@GET
@Path ( "test" )
@Produces ( "application/json" )
public Demo getDemo () {
Demo d = new Demo ();
d.id = 1;
d.name = "test";
return d;
}
//client config for a TestApi interface
List providers = new ArrayList ();
JSONProvider jsonProvider = new JSONProvider ();
Map<String, String> map = new HashMap<String, String> ();
map.put ( "http://www.myserviceapi.com", "myapi" );
jsonProvider.setNamespaceMap ( map );
providers.add ( jsonProvider );
TestApi proxy = JAXRSClientFactory.create ( url, TestApi.class,
providers, true );
Demo d = proxy.getDemo ();
if ( d != null ) {
System.out.println ( d.id + ":" + d.name );
}
//the Demo class
@XmlRootElement ( name = "demo", namespace = "http://www.myserviceapi.com" )
@XmlType ( name = "demo", namespace = "http://www.myserviceapi.com",
propOrder = { "name", "id" } )
@XmlAccessorType ( XmlAccessType.FIELD )
public class Demo {
public String name;
public int id;
}
笔记:
作为一个例子,这有点脏,但希望能让你前进。
Edit2:基于xstream的消息体编写器的示例,以避免使用jaxb。
@Produces ( "application/json" )
@Consumes ( "application/json" )
@Provider
public class XstreamJsonProvider implements MessageBodyReader<Object>,
MessageBodyWriter<Object> {
@Override
public boolean isWriteable ( Class<?> type, Type genericType,
Annotation[] annotations, MediaType mediaType ) {
return MediaType.APPLICATION_JSON_TYPE.equals ( mediaType )
&& type.equals ( Demo.class );
}
@Override
public long getSize ( Object t, Class<?> type, Type genericType,
Annotation[] annotations, MediaType mediaType ) {
// I'm being lazy - should compute the actual size
return -1;
}
@Override
public void writeTo ( Object t, Class<?> type, Type genericType,
Annotation[] annotations, MediaType mediaType,
MultivaluedMap<String, Object> httpHeaders, OutputStream entityStream )
throws IOException, WebApplicationException {
// deal with thread safe use of xstream, etc.
XStream xstream = new XStream ( new JettisonMappedXmlDriver () );
xstream.setMode ( XStream.NO_REFERENCES );
// add safer encoding, error handling, etc.
xstream.toXML ( t, entityStream );
}
@Override
public boolean isReadable ( Class<?> type, Type genericType,
Annotation[] annotations, MediaType mediaType ) {
return MediaType.APPLICATION_JSON_TYPE.equals ( mediaType )
&& type.equals ( Demo.class );
}
@Override
public Object readFrom ( Class<Object> type, Type genericType,
Annotation[] annotations, MediaType mediaType,
MultivaluedMap<String, String> httpHeaders, InputStream entityStream )
throws IOException, WebApplicationException {
// add error handling, etc.
XStream xstream = new XStream ( new JettisonMappedXmlDriver () );
return xstream.fromXML ( entityStream );
}
}
//now your client just needs this
List providers = new ArrayList ();
XstreamJsonProvider jsonProvider = new XstreamJsonProvider ();
providers.add ( jsonProvider );
TestApi proxy = JAXRSClientFactory.create ( url, TestApi.class,
providers, true );
Demo d = proxy.getDemo ();
if ( d != null ) {
System.out.println ( d.id + ":" + d.name );
}
示例代码缺少强大的媒体类型支持,错误处理,线程安全等部分。但是,它应该用最少的代码解决jaxb问题。
编辑3 - 示例服务器端配置正如我之前所说,我的服务器端是弹簧配置。以下是一个用于在提供程序中连接的示例配置:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jaxrs="http://cxf.apache.org/jaxrs"
xmlns:cxf="http://cxf.apache.org/core"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://cxf.apache.org/jaxrs http://cxf.apache.org/schemas/jaxrs.xsd
http://cxf.apache.org/core http://cxf.apache.org/schemas/core.xsd">
<import resource="classpath:META-INF/cxf/cxf.xml" />
<jaxrs:server id="TestApi">
<jaxrs:serviceBeans>
<ref bean="testApi" />
</jaxrs:serviceBeans>
<jaxrs:providers>
<bean id="xstreamJsonProvider" class="webtests.rest.XstreamJsonProvider" />
</jaxrs:providers>
</jaxrs:server>
<bean id="testApi" class="webtests.rest.TestApi">
</bean>
</beans>
我还注意到,在我使用的最新版本的cxf中,媒体类型存在差异,因此上面关于xstream消息体读取器/写入器的示例需要快速修改,其中isWritable / isReadable更改为:
return MediaType.APPLICATION_JSON_TYPE.getType ().equals ( mediaType.getType () )
&& MediaType.APPLICATION_JSON_TYPE.getSubtype ().equals ( mediaType.getSubtype () )
&& type.equals ( Demo.class );
编辑4 - 非弹簧配置使用您选择的servlet容器,进行配置
org.apache.cxf.jaxrs.servlet.CXFNonSpringJaxrsServlet
至少有2个init参数:
jaxrs.serviceClasses
jaxrs.providers
其中serviceClasses是您想要绑定的服务实现的空格分隔列表,例如上面提到的TestApi,provider是一个空格分隔的消息体提供者列表,例如上面提到的XstreamJsonProvider。在tomcat中,您可以将以下内容添加到web.xml:
<servlet>
<servlet-name>cxfservlet</servlet-name>
<servlet-class>org.apache.cxf.jaxrs.servlet.CXFNonSpringJaxrsServlet</servlet-class>
<init-param>
<param-name>jaxrs.serviceClasses</param-name>
<param-value>webtests.rest.TestApi</param-value>
</init-param>
<init-param>
<param-name>jaxrs.providers</param-name>
<param-value>webtests.rest.XstreamJsonProvider</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
这是在没有弹簧的情况下运行它的最快捷方式。如果您不使用servlet容器,则需要使用XstreamJsonProvider实例配置JAXRSServerFactoryBean.setProviders,并通过JAXRSServerFactoryBean.setResourceProvider方法设置服务实现。检查CXFNonSpringJaxrsServlet.init方法以查看在servlet容器中进行设置时如何执行此操作。
无论你的情况如何,这应该让你去。
从CXF 2.7.0升级到3.0.2时遇到此问题。以下是我要解决的问题:
在我的pom.xml中包含以下内容
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-rs-extension-providers</artifactId>
<version>3.0.2</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-jaxrs</artifactId>
<version>1.9.0</version>
</dependency>
并添加了以下提供商
<jaxrs:providers>
<bean class="org.codehaus.jackson.jaxrs.JacksonJaxbJsonProvider" />
</jaxrs:providers>
如果您使用的是jaxrs:客户端配置路径,您可以选择使用JacksonJsonProvider来提供
<jaxrs:client id="serviceId"
serviceClass="classname"
address="">
<jaxrs:providers>
<bean class="org.codehaus.jackson.jaxrs.JacksonJsonProvider">
<property name="mapper" ref="jacksonMapper" />
</bean>
</jaxrs:providers>
</jaxrs:client>
<bean id="jacksonMapper" class="org.codehaus.jackson.map.ObjectMapper">
</bean>
您需要在类路径中包含jackson-mapper-asl和jackson-jaxr工件
以编程方式创建服务器时,可以通过设置提供程序为json / xml添加邮件正文编写器。
JAXRSServerFactoryBean bean = new JAXRSServerFactoryBean();
bean.setAddress("http://localhost:9000/");
List<Object> providers = new ArrayList<Object>();
providers.add(new JacksonJaxbJsonProvider());
providers.add(new JacksonJaxbXMLProvider());
bean.setProviders(providers);
List<Class< ? >> resourceClasses = new ArrayList<Class< ? >>();
resourceClasses.add(YourRestServiceImpl.class);
bean.setResourceClasses(resourceClasses);
bean.setResourceProvider(YourRestServiceImpl.class, new SingletonResourceProvider(new YourRestServiceImpl()));
BindingFactoryManager manager = bean.getBus().getExtension(BindingFactoryManager.class);
JAXRSBindingFactory restFactory = new JAXRSBindingFactory();
restFactory.setBus(bean.getBus());
manager.registerBindingFactory(JAXRSBindingFactory.JAXRS_BINDING_ID, restFactory);
bean.create();
您还可以配置CXFNonSpringJAXRSServlet(假设使用JSONProvider):
<init-param>
<param-name>jaxrs.providers</param-name>
<param-value>
org.apache.cxf.jaxrs.provider.JSONProvider
(writeXsiType=false)
</param-value>
</init-param>
如果您希望将对象作为JSON作为响应,您可以尝试在您的rest客户端头中提及“Accept:application / json”。
如果您使用的是“cxf-rt-rs-client”3.03版。或以上确保xml名称空间和schemaLocation声明如下
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:jaxrs="http://cxf.apache.org/jaxrs"
xmlns:jaxrs-client="http://cxf.apache.org/jaxrs-client"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://cxf.apache.org/jaxrs http://cxf.apache.org/schemas/jaxrs.xsd http://cxf.apache.org/jaxrs-client http://cxf.apache.org/schemas/jaxrs-client.xsd">
并确保客户端具有JacksonJsonProvider或您的自定义JsonProvider
<jaxrs-client:client id="serviceClient" address="${cxf.endpoint.service.address}" serviceClass="serviceClass">
<jaxrs-client:headers>
<entry key="Accept" value="application/json"></entry>
</jaxrs-client:headers>
<jaxrs-client:providers>
<bean class="org.codehaus.jackson.jaxrs.JacksonJsonProvider">
<property name="mapper" ref="jacksonMapper" />
</bean>
</jaxrs-client:providers>
</jaxrs-client:client>
在我的场景中,当没有正确配置负载均衡的其余URL时,我遇到了类似的错误。我用portnumber验证了其余网址,但这个问题没有发生。所以我们不得不更新负载平衡配置来解决这个问题。
以上修改均不适合我。请参阅下面的工作配置:
依赖关系:
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-frontend-jaxrs</artifactId>
<version>3.3.2</version>
</dependency>
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-rs-extension-providers</artifactId>
<version>3.3.2</version>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-jaxrs</artifactId>
<version>1.9.13</version>
</dependency>
<dependency>
<groupId>org.codehaus.jettison</groupId>
<artifactId>jettison</artifactId>
<version>1.4.0</version>
</dependency>
veb.hml:
<servlet>
<servlet-name>cfxServlet</servlet-name>
<servlet-class>org.apache.cxf.jaxrs.servlet.CXFNonSpringJaxrsServlet</servlet-class>
<init-param>
<param-name>javax.ws.rs.Application</param-name>
<param-value>com.MyApplication</param-value>
</init-param>
<init-param>
<param-name>jaxrs.providers</param-name>
<param-value>org.codehaus.jackson.jaxrs.JacksonJsonProvider</param-value>
</init-param>
<init-param>
<param-name>jaxrs.extensions</param-name>
<param-value>
json=application/json
</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>cfxServlet</servlet-name>
<url-pattern>/v1/*</url-pattern>
</servlet-mapping>
享受编码.. :)