RequestMapping注解的作用

源码：
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Mapping
public @interface RequestMapping { } 作用： 用于建立请求URL和处理请求方法之间的对应关系。

/** Copyright 2002-2017 the original author or authors.** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**      http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*/package org.springframework.web.bind.annotation;import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;import org.springframework.core.annotation.AliasFor;/*** Annotation for mapping web requests onto specific handler classes and/or* handler methods.** <p>Handler methods annotated with this annotation can have very flexible* signatures. The exact details of the supported method arguments and return* values depend on the specific* {@link org.springframework.stereotype.Controller @Controller} model supported.* Both Spring Web MVC and Spring WebFlux support this annotation with some* differences. More details are available in the Spring Framework reference.** <p><b>NOTE:</b> {@code @RequestMapping} will only be processed if an* an appropriate {@code HandlerMapping}-{@code HandlerAdapter} pair* is configured. If you are defining custom {@code HandlerMappings} or* {@code HandlerAdapters}, then you need to add {@code RequestMappingHandlerMapping}* and {@code RequestMappingHandlerAdapter} to your configuration.</code>.** <p><b>NOTE:</b> When using controller interfaces (e.g. for AOP proxying),* make sure to consistently put <i>all</i> your mapping annotations - such as* {@code @RequestMapping} and {@code @SessionAttributes} - on* the controller <i>interface</i> rather than on the implementation class.** @author Juergen Hoeller* @author Arjen Poutsma* @author Sam Brannen* @since 2.5* @see GetMapping* @see PostMapping* @see PutMapping* @see DeleteMapping* @see PatchMapping* @see RequestParam* @see RequestAttribute* @see PathVariable* @see ModelAttribute* @see SessionAttribute* @see SessionAttributes* @see InitBinder* @see org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter* @see org.springframework.web.reactive.result.method.annotation.RequestMappingHandlerAdapter*/
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Mapping
public @interface RequestMapping {/*** Assign a name to this mapping.* <p><b>Supported at the type level as well as at the method level!</b>* When used on both levels, a combined name is derived by concatenation* with "#" as separator.* @see org.springframework.web.servlet.mvc.method.annotation.MvcUriComponentsBuilder* @see org.springframework.web.servlet.handler.HandlerMethodMappingNamingStrategy*/String name() default "";/*** The primary mapping expressed by this annotation.* <p>This is an alias for {@link #path}. For example* {@code @RequestMapping("/foo")} is equivalent to* {@code @RequestMapping(path="/foo")}.* <p><b>Supported at the type level as well as at the method level!</b>* When used at the type level, all method-level mappings inherit* this primary mapping, narrowing it for a specific handler method.*/@AliasFor("path")String[] value() default {};/*** In a Servlet environment only: the path mapping URIs (e.g. "/myPath.do").* Ant-style path patterns are also supported (e.g. "/myPath/*.do").* At the method level, relative paths (e.g. "edit.do") are supported within* the primary mapping expressed at the type level. Path mapping URIs may* contain placeholders (e.g. "/${connect}")* <p><b>Supported at the type level as well as at the method level!</b>* When used at the type level, all method-level mappings inherit* this primary mapping, narrowing it for a specific handler method.* @see org.springframework.web.bind.annotation.ValueConstants#DEFAULT_NONE* @since 4.2*/@AliasFor("value")String[] path() default {};/*** The HTTP request methods to map to, narrowing the primary mapping:* GET, POST, HEAD, OPTIONS, PUT, PATCH, DELETE, TRACE.* <p><b>Supported at the type level as well as at the method level!</b>* When used at the type level, all method-level mappings inherit* this HTTP method restriction (i.e. the type-level restriction* gets checked before the handler method is even resolved).*/RequestMethod[] method() default {};/*** The parameters of the mapped request, narrowing the primary mapping.* <p>Same format for any environment: a sequence of "myParam=myValue" style* expressions, with a request only mapped if each such parameter is found* to have the given value. Expressions can be negated by using the "!=" operator,* as in "myParam!=myValue". "myParam" style expressions are also supported,* with such parameters having to be present in the request (allowed to have* any value). Finally, "!myParam" style expressions indicate that the* specified parameter is <i>not</i> supposed to be present in the request.* <p><b>Supported at the type level as well as at the method level!</b>* When used at the type level, all method-level mappings inherit* this parameter restriction (i.e. the type-level restriction* gets checked before the handler method is even resolved).* <p>Parameter mappings are considered as restrictions that are enforced at* the type level. The primary path mapping (i.e. the specified URI value)* still has to uniquely identify the target handler, with parameter mappings* simply expressing preconditions for invoking the handler.*/String[] params() default {};/*** The headers of the mapped request, narrowing the primary mapping.* <p>Same format for any environment: a sequence of "My-Header=myValue" style* expressions, with a request only mapped if each such header is found* to have the given value. Expressions can be negated by using the "!=" operator,* as in "My-Header!=myValue". "My-Header" style expressions are also supported,* with such headers having to be present in the request (allowed to have* any value). Finally, "!My-Header" style expressions indicate that the* specified header is <i>not</i> supposed to be present in the request.* <p>Also supports media type wildcards (*), for headers such as Accept* and Content-Type. For instance,* <pre class="code">* @RequestMapping(value = "/something", headers = "content-type=text/*")* </pre>* will match requests with a Content-Type of "text/html", "text/plain", etc.* <p><b>Supported at the type level as well as at the method level!</b>* When used at the type level, all method-level mappings inherit* this header restriction (i.e. the type-level restriction* gets checked before the handler method is even resolved).* @see org.springframework.http.MediaType*/String[] headers() default {};/*** The consumable media types of the mapped request, narrowing the primary mapping.* <p>The format is a single media type or a sequence of media types,* with a request only mapped if the {@code Content-Type} matches one of these media types.* Examples:* <pre class="code">* consumes = "text/plain"* consumes = {"text/plain", "application/*"}* </pre>* Expressions can be negated by using the "!" operator, as in "!text/plain", which matches* all requests with a {@code Content-Type} other than "text/plain".* <p><b>Supported at the type level as well as at the method level!</b>* When used at the type level, all method-level mappings override* this consumes restriction.* @see org.springframework.http.MediaType* @see javax.servlet.http.HttpServletRequest#getContentType()*/String[] consumes() default {};/*** The producible media types of the mapped request, narrowing the primary mapping.* <p>The format is a single media type or a sequence of media types,* with a request only mapped if the {@code Accept} matches one of these media types.* Examples:* <pre class="code">* produces = "text/plain"* produces = {"text/plain", "application/*"}* produces = "application/json; charset=UTF-8"* </pre>* <p>It affects the actual content type written, for example to produce a JSON response* with UTF-8 encoding, {@code "application/json; charset=UTF-8"} should be used.* <p>Expressions can be negated by using the "!" operator, as in "!text/plain", which matches* all requests with a {@code Accept} other than "text/plain".* <p><b>Supported at the type level as well as at the method level!</b>* When used at the type level, all method-level mappings override* this produces restriction.* @see org.springframework.http.MediaType*/String[] produces() default {};}

package com.learn.controller;import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;// 控制器类
@Controller
@RequestMapping(path="/user")
public class HelloController {/*** 入门案例* @return*/@RequestMapping(path="/hello")public String sayHello(){System.out.println("Hello StringMVC");return "success";}/*** RequestMapping注解* @return*/@RequestMapping(value="/testRequestMapping",params = {"username=heihei"},headers = {"Accept"})public String testRequestMapping(){System.out.println("测试RequestMapping注解...");return "success";}}

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