spring PathVariable 源码
spring PathVariable 代码
文件路径：/spring-web/src/main/java/org/springframework/web/bind/annotation/PathVariable.java
/*
* Copyright 2002-2018 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
*
* https://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 which indicates that a method parameter should be bound to a URI template
* variable. Supported for {@link RequestMapping} annotated handler methods.
*
* <p>If the method parameter is {@link java.util.Map Map<String, String>}
* then the map is populated with all path variable names and values.
*
* @author Arjen Poutsma
* @author Juergen Hoeller
* @since 3.0
* @see RequestMapping
* @see org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter
*/
@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface PathVariable {
/**
* Alias for {@link #name}.
*/
@AliasFor("name")
String value() default "";
/**
* The name of the path variable to bind to.
* @since 4.3.3
*/
@AliasFor("value")
String name() default "";
/**
* Whether the path variable is required.
* <p>Defaults to {@code true}, leading to an exception being thrown if the path
* variable is missing in the incoming request. Switch this to {@code false} if
* you prefer a {@code null} or Java 8 {@code java.util.Optional} in this case.
* e.g. on a {@code ModelAttribute} method which serves for different requests.
* @since 4.3.3
*/
boolean required() default true;
}
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