我在将HttpHeaders注入我的休息服务课时遇到了困难.

@Path("/account")
@Produces({ MediaType.APPLICATION_JSON })
@Consumes({ MediaType.APPLICATION_JSON })
@Transactional
@Service
public class UserServiceImpl implements UserService {
    @Context
    private HttpHeaders headers;

    @Override
    @POST @Path("/{username}/")
    public User get(@PathParam(value = "username") String username)
        throws UnknownUserException {
        String requestId = headers.getHeaderString("requestId");

        return new User();
    }
}

当我尝试运行应用程序时,我在spring初始化期间遇到以下异常：

Caused by: java.lang.IllegalArgumentException: Can not set javax.ws.rs.core.HttpHeaders field com.acme.service.UserServiceImpl.headers to com.sun.proxy.$Proxy50
        at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167)
        at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:171)
        at sun.reflect.UnsafeFieldAccessorImpl.ensureObj(UnsafeFieldAccessorImpl.java:58)
        at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:75)
        at java.lang.reflect.Field.set(Field.java:758)
        at org.apache.cxf.jaxrs.utils.InjectionUtils$1.run(InjectionUtils.java:192)
        at java.security.AccessController.doPrivileged(Native Method)
        at org.apache.cxf.jaxrs.utils.InjectionUtils.injectFieldValue(InjectionUtils.java:188)
        at org.apache.cxf.jaxrs.utils.InjectionUtils.injectContextProxiesAndApplication(InjectionUtils.java:1058)
        at org.apache.cxf.jaxrs.JAXRSServerFactoryBean.injectContexts(JAXRSServerFactoryBean.java:405)
        at org.apache.cxf.jaxrs.JAXRSServerFactoryBean.updateClassResourceProviders(JAXRSServerFactoryBean.java:429)
        at org.apache.cxf.jaxrs.JAXRSServerFactoryBean.create(JAXRSServerFactoryBean.java:162)

一些实验表明我在尝试注入任何东西时都会遇到同样的错误.我有一个异常映射器,其中注入的http标头出现了问题,所以我创建了一个自定义提供程序来获取标题,但是在注入时却遇到了同样的问题.

我很确定我必须遗漏一些基本的东西.

我知道我可以在标题中添加我需要的东西作为方法的参数但我无法更改界面.

将上下文添加到操作中

    @Override
    @POST @Path("/{username}/")
    public User get(@Context HttpHeaders httpHeaders, @PathParam(value = "username") String username)

给我以下错误.

java.lang.IllegalArgumentException: object is not an instance of declaring class
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:483)
        at org.apache.cxf.service.invoker.AbstractInvoker.performInvocation(AbstractInvoker.java:181)
        at org.apache.cxf.service.invoker.AbstractInvoker.invoke(AbstractInvoker.java:97)

我发现如果我删除implements接口然后应用程序实际启动,但实际上没有注入.

解决方法:

我找到了一种解决方法(或者可能是预期的解决方案).看来spring正在使用基于接口的代理.我创建了一个中间接口,并在接口上停留了setHttpHeaders操作,并使用@Context注释了实现.一切似乎都很好.

public interface MyService {
    void doStuff();
}

public interface MyServiceInt extends MyService  {
    void setHttpHeaders(HttpHeaders headers);
}

@Path("/")
@Produces({ MediaType.APPLICATION_JSON })
@Consumes({ MediaType.APPLICATION_JSON })
@Transactional
@Service
public class MyServiceImpl implements MyServiceInt {
    private HttpHeaders httpHeaders;

    @Context
    void setHttpHeaders(HttpHeaders headers) {
        this.httpHeaders = httpHeaders;
    }

    @Override
    @POST @Path("/doStuff")
    public void doStuff() {
    }
}

如果有人知道,仍然希望听到更好的解决方案.