Question

我正在springboot webflux中创建一个大容量插入剩余端点，该端点如下所示，并且按预期工作，除非客户端发送插入0个对象的请求。我知道插入0元素是批量插入的一种极端情况，但是我希望它默默地执行任何操作而不是失败。

package test;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

@SpringBootApplication
@RestController
public class Application {    
    private static final Logger log = LoggerFactory.getLogger(Application.class);


    public static void main(String[] args) {
        // ignore args and just enable debug mode
        SpringApplication.run(Application.class, args);
    }

    @PostMapping("/insert")
    @ResponseBody
    public static Mono<Void> insert(@RequestBody Flux<MyObject> objects) {
        // implementation details not important
        return objects
            .doOnNext(obj -> log.info("inserting: " + obj.value))
            .then();
    }

    public static class MyObject {
        // actual contents not important
        public String value;
    }
}

运行curl -XPOST -H"Content-Type: application/stream+json" localhost:8080/insert将在服务器日志中产生以下内容：

2019-12-06 12:30:27.217 DEBUG 18372 --- [ctor-http-nio-7] o.s.w.s.adapter.HttpWebHandlerAdapter    : [137c5b5c] HTTP POST "/insert"
2019-12-06 12:30:27.218 DEBUG 18372 --- [ctor-http-nio-7] s.w.r.r.m.a.RequestMappingHandlerMapping : [137c5b5c] Mapped to test.Application#insert(Flux)
2019-12-06 12:30:27.219 DEBUG 18372 --- [ctor-http-nio-7] .r.m.a.RequestBodyMethodArgumentResolver : [137c5b5c] Content-Type:application/stream+json
2019-12-06 12:30:27.219 DEBUG 18372 --- [ctor-http-nio-7] .r.m.a.RequestBodyMethodArgumentResolver : [137c5b5c] 0..N [test.Application$MyObject]
2019-12-06 12:30:27.221 DEBUG 18372 --- [ctor-http-nio-7] a.w.r.e.AbstractErrorWebExceptionHandler : [137c5b5c] Resolved [ServerWebInputException: 400 BAD_REQUEST "Request body is missing: public static reactor.core.publisher.Mono<java.lang.Void> test.Application.insert(reactor.core.publisher.Flux<test.Application$MyObject>)"] for HTTP POST /insert
2019-12-06 12:30:27.221 DEBUG 18372 --- [ctor-http-nio-7] o.s.http.codec.json.Jackson2JsonEncoder  : [137c5b5c] Encoding [{timestamp=Fri Dec 06 12:30:27 EST 2019, path=/insert, status=400, error=Bad Request, message=Reques (truncated)...]
2019-12-06 12:30:27.222 DEBUG 18372 --- [ctor-http-nio-7] o.s.w.s.adapter.HttpWebHandlerAdapter    : [137c5b5c] Completed 400 BAD_REQUEST

我不明白的是，当日志明确指出正在将其以test.Application#insert(Flux)作为请求正文路由到0..N [test.Application$MyObject]时，它导致BAD_REQUEST的原因，这表明具有0个元素的正文应该有效

Answer 1

可能是@RequestBody(required = false)

根据客户要求处理空的助焊剂

1 个答案: