SpringMVC 4 1使用ResponseBodyAdvice支持jsonp

最新推荐文章于 2025-05-15 14:56:32 发布

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最新推荐文章于 2025-05-15 14:56:32 发布 · 1.2k 阅读

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本文详细介绍了SpringMVC 4.1中ResponseBodyAdvice接口的作用，特别是如何利用它实现JSONP的支持。通过分析AbstractJsonpResponseBodyAdvice的beforeBodyWrite方法，展示了如何自定义JSONP回调函数名称，并给出了一个具体的JsonpAdvice示例，以及如何在Controller中应用JSONP。最后，通过代码调试揭示了JSONP响应数据的生成过程。

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ResponseBodyAdvice是一个接口，接口描述，

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package org.springframework.web.servlet.mvc.method.annotation;
/**
* Allows customizing the response after the execution of an {@code @ResponseBody}
* or an {@code ResponseEntity} controller method but before the body is written
* with an {@code HttpMessageConverter}.
*
* <p>Implementations may be may be registered directly with
* {@code RequestMappingHandlerAdapter} and {@code ExceptionHandlerExceptionResolver}
* or more likely annotated with {@code @ControllerAdvice} in which case they
* will be auto-detected by both.
*
* @author Rossen Stoyanchev
* @since 4.1
*/
public interface ResponseBodyAdvice<T> {
/**
* Whether this component supports the given controller method return type
* and the selected {@code HttpMessageConverter} type.
* @param returnType the return type
* @param converterType the selected converter type
* @return {@code true} if {@link #beforeBodyWrite} should be invoked, {@code false} otherwise
*/
boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType);
/**
* Invoked after an {@code HttpMessageConverter} is selected and just before
* its write method is invoked.
* @param body the body to be written
* @param returnType the return type of the controller method
* @param selectedContentType the content type selected through content negotiation
* @param selectedConverterType the converter type selected to write to the response
* @param request the current request
* @param response the current response
* @return the body that was passed in or a modified, possibly new instance
*/
T beforeBodyWrite(T body, MethodParameter returnType, MediaType selectedContentType,
Class<? extends HttpMessageConverter<?>> selectedConverterType,
ServerHttpRequest request, ServerHttpResponse response);
}

package org.springframework.web.servlet.mvc.method.annotation;/** * Allows customizing the response after the execution of an {
    
    @code @ResponseBody} * or an {
    
    @code ResponseEntity} controller method but before the body is written * with an {
    
    @code HttpMessageConverter}. * * <p>Implementations may be may be registered directly with * {
    
    @code RequestMappingHandlerAdapter} and {
    
    @code ExceptionHandlerExceptionResolver} * or more likely annotated with {
    
    @code @ControllerAdvice} in which case they * will be auto-detected by both. * * @author Rossen Stoyanchev * @since 4.1 */public interface ResponseBodyAdvice<T> {   /**    * Whether this component supports the given controller method return type    * and the selected {
    
    @code HttpMessageConverter} type.    * @param returnType the return type    * @param converterType the selected converter type    * @return {
    
    @code true} if {
    
    @link #beforeBodyWrite} should be invoked, {
    
    @code false} otherwise    */   boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType);   /**    * Invoked after an {
    
    @code HttpMessageConverter} is selected and just before    * its write method is invoked.    * @param body the body to be written    * @param returnType the return type of the controller method    * @param selectedContentType the content type selected through content negotiation    * @param selectedConverterType the converter type selected to write to the response    *