Required String parameter ‘XXXX’ is not present

报错Required String parameter 'XXXX' is not present

{"resp_code":400,"resp_msg":"Required String parameter 'shopid' is not present"

是因为加了@RequestParam, RequestParam里面默认required=true

@Target(ElementType.PARAMETER)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface RequestParam {

	/**
	 * Alias for {@link #name}.
	 */
	@AliasFor("name")
	String value() default "";

	/**
	 * The name of the request parameter to bind to.
	 * @since 4.2
	 */
	@AliasFor("value")
	String name() default "";

	/**
	 * Whether the parameter is required.
	 * <p>Defaults to {@code true}, leading to an exception being thrown
	 * if the parameter is missing in the request. Switch this to
	 * {@code false} if you prefer a {@code null} value if the parameter is
	 * not present in the request.
	 * <p>Alternatively, provide a {@link #defaultValue}, which implicitly
	 * sets this flag to {@code false}.
	 */
	boolean required() default true;

	/**
	 * The default value to use as a fallback when the request parameter is
	 * not provided or has an empty value.
	 * <p>Supplying a default value implicitly sets {@link #required} to
	 * {@code false}.
	 */
	String defaultValue() default ValueConstants.DEFAULT_NONE;

}

解决方式 @RequestParam(required=false)