spring之@RequestBody和@RequestParam

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本文解析了Feign接口调用中因参数过长导致的错误，详细介绍了错误发生的原因及解决思路，并对比了@RequestParam与@RequestBody注解的使用场景和区别。

一、问题背景

1、feign接口代码

@PostMapping("/employee/listEmployeeDtosByTenantIdEmployeeIds")
    ResultVO<List<SysEmployeeDto>> listEmployeeDtosByTenantIdEmployeeIds(@RequestParam(value = "tenantId)") Long tenantId,@RequestParam(value = "employeeIds)") List<String> employeeIds);

2、报错信息

feign.RetryableException: Error writing to server executing POST http://user/feign/user/employee/listEmployeeDtosByTenantIdEmployeeIds?tenantId%29=46&employeeIds%29=1226709371205726209&employeeIds%29=1226709371205726210&employeeIds%29=1226709371205726211&employeeIds%29=1226709371205726212&employeeIds%29=1226709371205726213&employeeIds%29=1226709371205726214&employeeIds%29=1226709371205726215&employeeIds%29=1226709371205726216&employeeIds%29=1226709371205726217&employeeIds%29=1226709371205726218&employeeIds%29=1226709371205726219&employeeIds%29=1226709371205726220&employeeIds%29=1226709371205726221&employeeIds%29=1226709371205726222&employeeIds%29=1226709371205726223&employeeIds%29=1226709371205726224&employeeIds%29=1226709371205726225&employeeIds%29=1226709371205726226&employeeIds%29=1226709371205726227&employeeIds%29=1226709371205726228&employeeIds%29=1226709371205726229&employeeIds%29=1226709371205726230&employeeIds%29=1226709371205726231&employeeIds%29=1226709371205726232&employeeIds%29=1226709371205726233&employeeIds%29=1226709371205726234&employeeIds%29=1226709371205726235&employeeIds%29=1226709371205726236&employeeIds%29=1226709371205726237&employeeIds%29=1226709371205726238&employeeIds%29=1226709371205726239&employeeIds%29=1226709371205726240&employeeIds%29=1226709371205726241&employeeIds%29=1226709371205726242&employeeIds%29=1226709371205726243&employeeIds%29=1226709371205726244&employeeIds%29=1226709371205726245&employeeIds%29=1226709371205726246&employeeIds%29=1226709371205726247&employeeIds%29=1226709371205726248&employeeIds%29=1226709371205726249&employeeIds%29=1226709371205726250&employeeIds%29=1226709371205726251&employeeIds%29=1226709371205726252&employeeIds%29=1226709371205726253&employeeIds%29=1226709371205726254&employeeIds%29=1226709371205726255&employeeIds%29=1226709371205726256&employeeIds%29=1226709371205726257&employeeIds%29=1226709371205726258&employeeIds%29=1226709371205726259&employeeIds%29=1226709371205726260&employeeIds%29=1226709371205726261&<…>1205776151&employeeIds%29=1226709371205776152&employeeIds%29=1226709371205776153&employeeIds%29=1226709371205776154&employeeIds%29=1226709371205776155&employeeIds%29=1226709371205776156&employeeIds%29=1226709371205776157&employeeIds%29=1226709371205776158&employeeIds%29=1226709371205776159&employeeIds%29=1226709371205776160&employeeIds%29=1226709371205776161&employeeIds%29=1226709371205776162&employeeIds%29=1226709371205776163&employeeIds%29=1226709371205776164&employeeIds%29=1226709371205776165&employeeIds%29=1226709371205776166&employeeIds%29=1226709371205776167&employeeIds%29=1226709371205776168&employeeIds%29=1226709371205776169&employeeIds%29=1226709371205776170&employeeIds%29=1226709371205776171&employeeIds%29=1226709371205776172&employeeIds%29=1226709371205776173&employeeIds%29=1226709371205776174&employeeIds%29=1226709371205776175&employeeIds%29=1226709371205776176&employeeIds%29=1226709371205776177&employeeIds%29=1226709371205776178&employeeIds%29=1226709371205776179&employeeIds%29=1226709371205776180&employeeIds%29=1226709371205776181&employeeIds%29=1226709371205776182&employeeIds%29=1226709371205776183&employeeIds%29=1226709371205776184&employeeIds%29=1226709371205776185&employeeIds%29=1226709371205776186&employeeIds%29=1226709371205776187&employeeIds%29=1226709371205776188&employeeIds%29=1226709371205776189&employeeIds%29=1226709371205776190&employeeIds%29=1226709371205776191&employeeIds%29=1226709371205776192&employeeIds%29=1226709371205776193&employeeIds%29=1226709371205776194&employeeIds%29=1226709371205776195&employeeIds%29=1226709371205776196&employeeIds%29=1226709371205776197&employeeIds%29=1226709371205776198&employeeIds%29=1226709371205776199&employeeIds%29=1226709371205776200&employeeIds%29=1226709371205776201&employeeIds%29=1226709371205776202&employeeIds%29=1226709371205776203&employeeIds%29=1226709371205776204&employeeIds%29=1226709371205776205&employeeIds%29=1226709371205776206&employeeIds%29=1226709371205776207&employeeIds%29=1226709371205776208

at feign.FeignException.errorExecuting(FeignException.java:65)
at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:105)
at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:77)
at feign.ReflectiveFeign $F e i g n I n v o c a t i o n H a n d l e r . i n v o k e (R e f l e c t i v e F e i g n . j a v a : 102) a t c o m . s u n . p r o x y .$ Proxy150.listEmployeeDtosByTenantIdEmployeeIds(Unknown Source)
at com.oppo.sales.service.impl.SysUserFeignClientConsumeServiceImpl.listEmployeeDtosByTenantIdEmployeeIds(SysUserFeignClientConsumeServiceImpl.java:199)
at com.oppo.sales.service.impl.SysUserFeignClientConsumeServiceImplTest.listEmployeeDtosByTenantIdEmployeeIds(SysUserFeignClientConsumeServiceImplTest.java:39)
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:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:73)
at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:83)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner $2 . e v a l u a t e (P a r e n t R u n n e r . j a v a : 268) a t o r g . s p r i n g f r a m e w o r k . t e s t . c o n t e x t . j u n i t 4 . s t a t e m e n t s . R u n B e f o r e T e s t C l a s s C a l l b a c k s . e v a l u a t e (R u n B e f o r e T e s t C l a s s C a l l b a c k s . j a v a : 61) a t o r g . s p r i n g f r a m e w o r k . t e s t . c o n t e x t . j u n i t 4 . s t a t e m e n t s . R u n A f t e r T e s t C l a s s C a l l b a c k s . e v a l u a t e (R u n A f t e r T e s t C l a s s C a l l b a c k s . j a v a : 70) a t o r g . j u n i t . r u n n e r s . P a r e n t R u n n e r . r u n (P a r e n t R u n n e r . j a v a : 363) a t o r g . s p r i n g f r a m e w o r k . t e s t . c o n t e x t . j u n i t 4 . S p r i n g J U n i t 4 C l a s s R u n n e r . r u n (S p r i n g J U n i t 4 C l a s s R u n n e r . j a v a : 190) a t o r g . j u n i t . r u n n e r . J U n i t C o r e . r u n (J U n i t C o r e . j a v a : 137) a t c o m . i n t e l l i j . j u n i t 4 . J U n i t 4 I d e a T e s t R u n n e r . s t a r t R u n n e r W i t h A r g s (J U n i t 4 I d e a T e s t R u n n e r . j a v a : 68) a t c o m . i n t e l l i j . r t . e x e c u t i o n . j u n i t . I d e a T e s t R u n n e r$ Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: java.io.IOException: Error writing to server
at sun.net.www.protocol.http.HttpURLConnection.writeRequests(HttpURLConnection.java:700)
at sun.net.www.protocol.http.HttpURLConnection.writeRequests(HttpURLConnection.java:712)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1591)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1498)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
at feign.Client $D e f a u l t . c o n v e r t R e s p o n s e (C l i e n t . j a v a : 150) a t f e i g n . C l i e n t$ Default.execute(Client.java:72)
at org.springframework.cloud.openfeign.ribbon.FeignLoadBalancer.execute(FeignLoadBalancer.java:89)
at org.springframework.cloud.openfeign.ribbon.FeignLoadBalancer.execute(FeignLoadBalancer.java:55)
at com.netflix.client.AbstractLoadBalancerAwareClient$1.call(AbstractLoadBalancerAwareClient.java:104)
at com.netflix.loadbalancer.reactive.LoadBalancerCommand$3$1.call(LoadBalancerCommand.java:303)
at com.netflix.loadbalancer.reactive.LoadBalancerCommand$3$1.call(LoadBalancerCommand.java:287)
at rx.internal.util.ScalarSynchronousObservable$3.call(ScalarSynchronousObservable.java:231)
at rx.internal.util.ScalarSynchronousObservable $3 . c a l l (S c a l a r S y n c h r o n o u s O b s e r v a b l e . j a v a : 228) a t r x . O b s e r v a b l e . u n s a f e S u b s c r i b e (O b s e r v a b l e . j a v a : 10327) a t r x . i n t e r n a l . o p e r a t o r s . O n S u b s c r i b e C o n c a t M a p$ ConcatMapSubscriber.drain(OnSubscribeConcatMap.java:286)
at rx.internal.operators.OnSubscribeConcatMap$ConcatMapSubscriber.onNext(OnSubscribeConcatMap.java:144)
at com.netflix.loadbalancer.reactive.LoadBalancerCommand$1.call(LoadBalancerCommand.java:185)
at com.netflix.loadbalancer.reactive.LoadBalancerCommand $1 . c a l l (L o a d B a l a n c e r C o m m a n d . j a v a : 180) a t r x . O b s e r v a b l e . u n s a f e S u b s c r i b e (O b s e r v a b l e . j a v a : 10327) a t r x . i n t e r n a l . o p e r a t o r s . O n S u b s c r i b e C o n c a t M a p . c a l l (O n S u b s c r i b e C o n c a t M a p . j a v a : 94) a t r x . i n t e r n a l . o p e r a t o r s . O n S u b s c r i b e C o n c a t M a p . c a l l (O n S u b s c r i b e C o n c a t M a p . j a v a : 42) a t r x . O b s e r v a b l e . u n s a f e S u b s c r i b e (O b s e r v a b l e . j a v a : 10327) a t r x . i n t e r n a l . o p e r a t o r s . O p e r a t o r R e t r y W i t h P r e d i c a t e$ SourceSubscriber $1 . c a l l (O p e r a t o r R e t r y W i t h P r e d i c a t e . j a v a : 127) a t r x . i n t e r n a l . s c h e d u l e r s . T r a m p o l i n e S c h e d u l e r$ InnerCurrentThreadScheduler.enqueue(TrampolineScheduler.java:73)
at rx.internal.schedulers.TrampolineScheduler $I n n e r C u r r e n t T h r e a d S c h e d u l e r . s c h e d u l e (T r a m p o l i n e S c h e d u l e r . j a v a : 52) a t r x . i n t e r n a l . o p e r a t o r s . O p e r a t o r R e t r y W i t h P r e d i c a t e$ SourceSubscriber.onNext(OperatorRetryWithPredicate.java:79)
at rx.internal.operators.OperatorRetryWithPredicate $S o u r c e S u b s c r i b e r . o n N e x t (O p e r a t o r R e t r y W i t h P r e d i c a t e . j a v a : 45) a t r x . i n t e r n a l . u t i l . S c a l a r S y n c h r o n o u s O b s e r v a b l e$ WeakSingleProducer.request(ScalarSynchronousObservable.java:276)
at rx.Subscriber.setProducer(Subscriber.java:209)
at rx.internal.util.ScalarSynchronousObservable $J u s t O n S u b s c r i b e . c a l l (S c a l a r S y n c h r o n o u s O b s e r v a b l e . j a v a : 138) a t r x . i n t e r n a l . u t i l . S c a l a r S y n c h r o n o u s O b s e r v a b l e$ JustOnSubscribe.call(ScalarSynchronousObservable.java:129)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:48)
at rx.internal.operators.OnSubscribeLift.call(OnSubscribeLift.java:30)
at rx.Observable.subscribe(Observable.java:10423)
at rx.Observable.subscribe(Observable.java:10390)
at rx.observables.BlockingObservable.blockForSingle(BlockingObservable.java:443)
at rx.observables.BlockingObservable.single(BlockingObservable.java:340)
at com.netflix.client.AbstractLoadBalancerAwareClient.executeWithLoadBalancer(AbstractLoadBalancerAwareClient.java:112)
at org.springframework.cloud.openfeign.ribbon.LoadBalancerFeignClient.execute(LoadBalancerFeignClient.java:63)
at feign.SynchronousMethodHandler.executeAndDecode(SynchronousMethodHandler.java:98)
… 35 more

3、问题原因

feign.RetryableException: Error writing to server executing POST，参数过长，导致执行出错

二、@RequestBody和@RequestParam

1、@RequestParam、@RequestBody的作用

1）前言

在SpringMvc后台进行获取数据，一般有三种：
1.request.getParameter(“参数名”)
2.用@RequestParam注解获取
3.Springmvc默认支持的数据类型接收参数，可直接通过controller方法参数对应jsp中请求参数name直接获取

2）作用

简单一点说，@RequestBody和@RequestParam作用就是把请求中的指定名称的参数传递给控制器中的形参赋值

2、两个注解的区别

区别	@RequestParam	@RequestBody
参数来源	接收的参数是来自requestHeader中，即请求头	接收的参数是来自requestBody中，即请求体
Content-Type编码格式	application/x-www-form-urlencoded	非 Content-Type: application/x-www-form-urlencoded编码格式的数据，比如：application/json、application/xml等类型的数据
适用的请求方式	GET	GET、POST