将Spring MockMvc配置为在内置参数解析器之前使用自定义参数解析器

import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.List;

@RestController
public class CustomArgumentResolverExampleController {

    @GetMapping("/example")
    public String exampleMethod(@RequestParam("param") String param) {
        // 处理请求参数
        return "Response";
    }

    public static class CustomArgumentResolver implements HandlerMethodArgumentResolver {
        @Override
        public boolean supportsParameter(MethodParameter parameter) {
            // 判断是否支持解析该参数
            return parameter.getParameterType().equals(String.class);
        }

        @Override
        public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
            // 解析参数的逻辑
            HttpServletRequest request = webRequest.getNativeRequest(HttpServletRequest.class);
            HttpServletResponse response = webRequest.getNativeResponse(HttpServletResponse.class);
            // 解析参数并返回
            return request.getParameter("customParam");
        }
    }

    public static class WebMvcConfig implements WebMvcConfigurer {
        @Override
        public void addArgumentResolvers(List<HandlerMethodArgumentResolver> resolvers) {
            // 注册自定义参数解析器
            resolvers.add(new CustomArgumentResolver());
        }
    }

    public static void main(String[] args) {
        MockMvc mockMvc = MockMvcBuilders.standaloneSetup(new CustomArgumentResolverExampleController())
                .setCustomArgumentResolvers(new CustomArgumentResolver())
                .build();
    }
}