从Spring 4.2.x开始，你可以创建自定义映射注释，并将其@RequestMapping用作元注释。所以：
有没有一种方法可以产生带有消费和生产默认值的“复合/继承/聚合”注释，所以我可以这样写：
@JSONRequestMapping(value = "/foo", method = RequestMethod.POST)
是的，有这种方法。你可以创建如下的元注释：
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@RequestMapping(consumes = "application/json", produces = "application/json")
public @interface JsonRequestMapping {
@AliasFor(annotation = RequestMapping.class, attribute = "value")
String[] value() default {};
@AliasFor(annotation = RequestMapping.class, attribute = "method")
RequestMethod[] method() default {};
@AliasFor(annotation = RequestMapping.class, attribute = "params")
String[] params() default {};
@AliasFor(annotation = RequestMapping.class, attribute = "headers")
String[] headers() default {};
@AliasFor(annotation = RequestMapping.class, attribute = "consumes")
String[] consumes() default {};
@AliasFor(annotation = RequestMapping.class, attribute = "produces")
String[] produces() default {};
}
然后，你可以使用默认设置，甚至可以根据需要覆盖它们：
@JsonRequestMapping(method = POST)
public String defaultSettings() {
return "Default settings";
}
@JsonRequestMapping(value = "/override", method = PUT, produces = "text/plain")
public String overrideSome(@RequestBody String json) {
return json;
}
你可以AliasFor在spring的javadoc和github Wiki中了解更多信息。
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