Spring Boot 统一修改 Controller 返回值
Spring Boot About 2,943 words需求
在Controller
返回对象时,包装一层统一的返回值对象。
如:返回了String
对象,需包装成{"code":0, "data":"string"}
。
HandlerMethodReturnValueHandler
自定义 HandlerMethodReturnValueHandler
public class MyReturnValueHandler implements HandlerMethodReturnValueHandler {
private final HandlerMethodReturnValueHandler handler;
public MyReturnValueHandler(HandlerMethodReturnValueHandler handler) {
this.handler = handler;
}
@Override
public boolean supportsReturnType(MethodParameter returnType) {
return (AnnotatedElementUtils.hasAnnotation(returnType.getContainingClass(), ResponseBody.class) ||
returnType.hasMethodAnnotation(ResponseBody.class));
}
@Override
public void handleReturnValue(Object returnValue, MethodParameter returnType,
ModelAndViewContainer mavContainer, NativeWebRequest webRequest) throws Exception {
Map<String, Object> map = new HashMap<>();
map.put("code", 0);
map.put("data", returnValue);
handler.handleReturnValue(map, returnType, mavContainer, webRequest);
}
}
注入 HandlerMethodReturnValueHandler
@Configuration
public class ReturnValueConfig implements InitializingBean {
private final RequestMappingHandlerAdapter requestMappingHandlerAdapter;
public ReturnValueConfig(RequestMappingHandlerAdapter requestMappingHandlerAdapter) {
this.requestMappingHandlerAdapter = requestMappingHandlerAdapter;
}
@Override
public void afterPropertiesSet() throws Exception {
List<HandlerMethodReturnValueHandler> originHandlers = requestMappingHandlerAdapter.getReturnValueHandlers();
List<HandlerMethodReturnValueHandler> newHandlers = new ArrayList<>(originHandlers.size());
for (HandlerMethodReturnValueHandler originHandler : originHandlers) {
if (originHandler instanceof RequestResponseBodyMethodProcessor) {
newHandlers.add(new MyReturnValueHandler(originHandler));
}else{
newHandlers.add(originHandler);
}
}
requestMappingHandlerAdapter.setReturnValueHandlers(newHandlers);
}
}
ResponseBodyAdvice
使用@RestControllerAdvice
或@ControllerAdvice
注入自定义ResponseBodyAdvice
。
@RestControllerAdvice
public class ControllerAdvice implements ResponseBodyAdvice {
@Override
public boolean supports(MethodParameter returnType, Class converterType) {
return true;
}
@Override
public Object beforeBodyWrite(Object body, MethodParameter returnType,
MediaType selectedContentType, Class selectedConverterType,
ServerHttpRequest request, ServerHttpResponse response) {
if (body instanceof Map) {
((Map) body).put("code", "0");
}
return body;
}
}
说明
HandlerMethodReturnValueHandler
都会先于ResponseBodyAdvice
执行,所有在HandlerMethodReturnValueHandler
的改动都会带到ResponseBodyAdvice
。
Views: 2,365 · Posted: 2023-02-08
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