rest - 返回 OK (200) 而不是 NO_CONTENT (204)

Question

我的 REST api 中有几个返回无效的方法。默认情况下，jersey 为此类响应设置 204。我知道如果我返回任何非空对象响应是 200，但是，我想将状态代码设置为 200 而无需修改这些方法。我怎样才能做到这一点？

Answer 1

如果您不介意覆盖对 200 的每个 204 响应，那么您可以使用过滤器:

import java.io.IOException;

import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerResponseContext;
import javax.ws.rs.container.ContainerResponseFilter;
import javax.ws.rs.ext.Provider;

@Provider
public class NoContentToOkResposeFilter implements ContainerResponseFilter {

    @Override
    public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext) throws IOException {
        if (responseContext.getStatus() == 204) {
            responseContext.setStatus(200);
        }
    }
}

---

更新

如果您更喜欢可自定义的解决方案，则可以使用注释和 DynamicFeature 激活过滤器。

注释:

import java.lang.annotation.Retention;
import java.lang.annotation.Target;

import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

@Target(METHOD)
@Retention(RUNTIME)
public @interface ResponseStatus {

    int value() default 200;
}

过滤器:

import java.io.IOException;

import javax.ws.rs.container.ContainerRequestContext;
import javax.ws.rs.container.ContainerResponseContext;
import javax.ws.rs.container.ContainerResponseFilter;

public class OverrideResponseStatusFilter implements ContainerResponseFilter {

    private final int statusCode;

    public OverrideResponseStatusFilter(int statusCode) {
        this.statusCode = statusCode;
    }

    @Override
    public void filter(ContainerRequestContext requestContext, ContainerResponseContext responseContext) throws IOException {
        responseContext.setStatus(statusCode);
    }
}

动态特征:

import javax.ws.rs.container.DynamicFeature;
import javax.ws.rs.container.ResourceInfo;
import javax.ws.rs.core.FeatureContext;
import javax.ws.rs.ext.Provider;

@Provider
public class ResponseStatusDynamicFeature implements DynamicFeature {

    @Override
    public void configure(ResourceInfo resourceInfo, FeatureContext context) {
        ResponseStatus responseStatus = (ResponseStatus) resourceInfo.getResourceMethod().getAnnotation(ResponseStatus.class);
        if (responseStatus != null) {
            context.register(new OverrideResponseStatusFilter(responseStatus.value()));
        }
    }
}

最后用@ResponseStatus(200)注释你的资源方法:

@GET
@Path("/nothing")
@ResponseStatus(200)
public void nothing() {
}