知识点回顾
springmvc支持的返回值
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ModelAndView
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Model
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View
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ResponseEntity
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ResponseBodyEmitter
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StreamingResponseBody
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HttpHeaders
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Callable
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DeferredResult
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ListenableFuture
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CompletionStage
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CompletionStage
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WebAsyncTasj
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有@ModelAttribute
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@ResponseBody注解--->RequestResponseBodyMethodProcessor
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