如何将对象注入jersey请求上下文？

Question

过滤器类

@Override
public void filter(ContainerRequestContext request) throws IOException {
    MyObject obj = new MyObject();
    // Inject MyObject to request which I dont know how
}

资源类别

@PUT @Consumes("application/json")
@Path("/")
public String create(
        JSONParam sample,
        @Context MyObject obj) {

    System.out.println(obj.getName());

    return "";
}

Answer 1

您可以使用ContaInterRequestContext.SetProperty(String，Object)。然后只需插入ContainerRequestContext

@Override
public void filter(ContainerRequestContext crc) throws IOException {
    MyObject obj = new MyObject();
    crc.setProperty("myObject", myObject);
}

@POST
public Response getResponse(@Context ContainerRequestContext crc) {
    return Response.ok(crc.getProperty("myObject")).build();
}

直接插入MyObject的另一个选择是使用Jersey 2提供的HK2功能。

创建一个工厂，注入ContainerRequestContext并返回MyObject。例如

import javax.inject.Inject;
import javax.ws.rs.container.ContainerRequestContext;
import jetty.plugin.test.domain.MyObject;
import org.glassfish.hk2.api.Factory;

public class MyObjectFactory implements Factory<MyObject> {
    
    private final ContainerRequestContext context;
    
    @Inject
    public MyObjectFactory(ContainerRequestContext context) {
        this.context = context;
    }

    @Override
    public MyObject provide() {
        return (MyObject)context.getProperty("myObject");
    }

    @Override
    public void dispose(MyObject t) {}  
}

public class InjectApplication extends ResourceConfig {
    
    public InjectApplication() {
        ...
        register(new AbstractBinder(){
            @Override
            protected void configure() {
                bindFactory(MyObjectFactory.class)
                        .to(MyObject.class)
                        .in(RequestScoped.class);
            } 
        });
    }
}

使用与上面筛选器示例中相同的属性设置，然后可以将MyObject插入到@context中

@GET
public Response getTest(@Context MyObject myObject) {
    return Response.ok(myObject.getMessage()).build();
}

• 在自定义注入
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有关此实现的问题，请参见此问题。

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