泽西岛:@PathParam，用逗号分隔到List< MyObject> [英] Jersey: @PathParam with commas to List<MyObject>

问题描述

我想用这种模式调用我的Web服务:

I would like to call my Webservice with this pattern :

/resource/1,2,3

在我的课堂上，我想将我的参数绑定到对象列表

And in my Class I want to bind my parameters to a List of Object

@Path("/resource")
public class AppWS {

    @GET
    @Path("/{params}")
    public Response get(@PathParam("params") List<MyObject> params) {
        return Response.status(200).entity("output").build();
    }
}

使用一个简单的对象:

public class MyObject {
    Integer value;
    public MyObject(Integer value) {
        this.value = value;
    }
}

nb:如果可能的话，我不想创建一个扩展List的MyObjectList(并且有一个拆分字符串的构造函数)

nb: If it possible I don't want to create an MyObjectList which extends List (and have a constructor which split my string)

我应该如何进行?

推荐答案

我不确定1,2,3的方式.

如果您坚持要

private Response get(List<MyObject> params) {
}

@GET
@Path("/{params}")
public Response get(@PathParam("params") String params) {

    return get(Stream.of(params.split(","))
        .map(MyObject::new)
        .collect(Collectors.toList()));
}

如果您真的坚持，

注释

@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.FIELD, ElementType.PARAMETER})
public @interface MyObjectsParam {

}

转换器

public class MyObjectsParamDateConverter
    implements ParamConverter<List<MyObject>> {

    @Override
    public List<MyObject> fromString(final String value) {
        return Stream.of(params.split(","))
          .map(MyObject::new)
          .collect(Collectors.toList())
    }

    @Override
    public String toString(final List<MyObject> value) {
        return value.stream()
            .map(o -> o.getValue())
            .map(Object::toString)
            .collect(Collectors.joining(","));
    }
}

提供者，

@Provider
public class MyObjectsParamConverterProvider
    implements ParamConverterProvider {

    @Override
    @SuppressWarnings("unchecked")
    default ParamConverter getConverter(final Class<S> rawType,
                                        final Type genericType,
                                        final Annotation[] annotations) {
        for (final Annotation annotation : annotations) {
            if (MyObjectsParam.class.isInstance(annotation)) {
                return new MyObjectsParamDateConverter();
            }
        }

        return null;
    }
}

现在您可以像这样使用它了.

Now you can use it like this.

@GET
@Path("/{params}") // still '1,2,3'
public Response get(
    @PathParam("params")
    @MyObjectsParam // IN ACTION!!!
    List<MyObject> params) {

}

这篇关于泽西岛:@PathParam，用逗号分隔到List< MyObject>的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！