Spring编程：@ResponseBody 注解

1.定义

@ResponseBody 注解是一个标识型注解，无需设置任何参数值。该注解的作用是：将 Controller 方法返回的对象，转换为 JSON 格式，通过 response 对象返回给客户端。

2.源代码

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;

/**
 * Annotation that indicates a method return value should be bound to the web
 * response body. Supported for annotated handler methods in Servlet environments.
 *
 * <p>As of version 4.0 this annotation can also be added on the type level in
 * which case it is inherited and does not need to be added on the method level.
 *
 * @author Arjen Poutsma
 * @since 3.0
 * @see RequestBody
 * @see RestController
 */
@Target({ElementType.TYPE, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface ResponseBody {

}