用于生成和使用JSON的控制器的Spring RequestMapping

Question

    @RequestMapping(value = "/foo", method = RequestMethod.POST,
            consumes = MediaType.APPLICATION_JSON_VALUE,
            produces = MediaType.APPLICATION_JSON_VALUE)

    @JSONRequestMapping(value = "/foo", method = RequestMethod.POST)

我需要控制我回来的东西。我希望生成/消耗注释方法，以便获得适当的内容类型头。

Answer 1

从Spring 4.2.x开始，您可以使用@requestmapping作为元注释来创建自定义映射注释。所以：

有没有一种方法可以生成一个“复合/继承/聚合”注释，其中包含消耗和生产的默认值，这样我就可以编写如下内容：

@JSONRequestMapping(value = "/foo", method = RequestMethod.POST)

是的，有这么一个办法。您可以创建一个元注释，如下所示：

@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 {};
}

@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;
}