SpringBoot项目实战之@ControllerAdvice+RequestBodyAdvice实现请求体全局统一处理

在实际项目开发中，经常需要对前台发来的请求body进行处理，例如参数过滤，参数校验，不合法参数拦截，参数解密等等。Spring中提供了 @ControllerAdvice+RequestBodyAdvice 的解决方案对请求进行全局统一处理，可以避免在controller层对业务代码入侵。

注意：该方法只对使用了@RequestBody注解的参数生效，本质上是AOP，获取的是在请求头中的属性，如果通过GET请求方式，例如http://localhost:8080/xx?id=1 此种方法，是无法获得id参数的，此处下面将用代码证明。

代码示例

/**
 * @Author zhangting
 * @Desc 请求body全局统一处理
 * @Date 2020/07/29
 **/
@Slf4j
@ControllerAdvice(basePackages = "com.example.demo.controller2")
public class GlobalRequestBodyAdvice implements RequestBodyAdvice {
    @Override
    public boolean supports(MethodParameter methodParameter, Type type, Class<? extends HttpMessageConverter<?>> aClass) {
        // 此处true代表执行当前advice的业务，false代表不执行
        return true;
    }

    /**
     * 读取参数前执行
     *
     * @param httpInputMessage
     * @param methodParameter
     * @param type
     * @param aClass
     * @return
     * @throws IOException
     */
    @Override
    public HttpInputMessage beforeBodyRead(HttpInputMessage httpInputMessage, MethodParameter methodParameter, Type type, Class<? extends HttpMessageConverter<?>> aClass) throws IOException {
        log.info("-----beforeBodyRead-----");
        return httpInputMessage;
    }

    /**
     * 读取参数后执行
     *
     * @param o
     * @param httpInputMessage
     * @param methodParameter
     * @param type
     * @param aClass
     * @return
     */
    @Override
    public Object afterBodyRead(Object o, HttpInputMessage httpInputMessage, MethodParameter methodParameter, Type type, Class<? extends HttpMessageConverter<?>> aClass) {
        log.info("-----afterBodyRead-----");
        log.info("class name is {}",methodParameter.getDeclaringClass().getSimpleName());
        log.info("method name is {}",methodParameter.getMethod().getName());
        log.info("request parameter is {}",o.toString());
        return o;
    }

    /**
     * 无请求时的处理
     *
     * @param o
     * @param httpInputMessage
     * @param methodParameter
     * @param type
     * @param aClass
     * @return
     */
    @Override
    public Object handleEmptyBody(Object o, HttpInputMessage httpInputMessage, MethodParameter methodParameter, Type type, Class<? extends HttpMessageConverter<?>> aClass) {
        log.info("-----handleEmptyBody-----");
        return o;
    }
}

@ControllerAdvice可以指定当前Advice生效的包路径，不指定默认全局生效。

测试类

/**
 * @Author zhangting
 * @Desc 测试
 * @Date 2020/07/29
 **/
@RestController
@RequestMapping("/v2")
@Slf4j
public class TestController2 {

    @RequestMapping(method = RequestMethod.GET, value = "/get")
    public ResponseEntity<?> get(@RequestParam String id) {
        log.info("id is {}", id);
        Map<String,String> rsp = new HashMap<>();
        rsp.put("code","200");
        rsp.put("msg","success");
        return new ResponseEntity<>(rsp, HttpStatus.OK);
    }

    @RequestMapping(method = RequestMethod.POST, value = "/post")
    public ResponseEntity<?> post(@RequestBody Map<String, String> map) {
        log.info("begin /v2/post");
        Map<String,String> rsp = new HashMap<>();
        rsp.put("code","200");
        rsp.put("msg","success");
        log.info("end /v2/post");
        return new ResponseEntity<>(rsp, HttpStatus.OK);
    }
}