Springboot Controller接口默认自动填充业务实体参数值详解

import java.lang.annotation.*;


/**
 * @Author: JCccc
 * @Date: 2022-4-11 18:45
 * @Description:
 */
@Target({ElementType.PARAMETER})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface LoginUserX {
}

import org.springframework.core.MethodParameter;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;

import java.util.Objects;

/**
 * @Author: JCccc
 * @Date: 2022-4-11 18:45
 * @Description:
 */
public class LoginUserParamResolver  implements HandlerMethodArgumentResolver {


    @Override
    public boolean supportsParameter(MethodParameter parameter) {
        if (parameter.getParameterType().isAssignableFrom(LoginUserAnalysis.class) && parameter.hasParameterAnnotation(LoginUserX.class)) {
            return true;
        }
        return false;
    }

    @Override
    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
       if (Objects.nonNull(parameter.getParameterAnnotation(LoginUserX.class))){
           String token = webRequest.getHeader("token");
           //解析token 、获取 登录用户信息等等，或者是 拿你需要的业务参数
           return  new LoginUserAnalysis().setLoginNameAnalysis("JCcccc").setPhoneAnalysis("136919xxxxx").setTopRoleTypeAnalysis(1);
       }
       return null;
    }
}

import lombok.Data;
import lombok.experimental.Accessors;

@Data
@Accessors(chain = true)
public class LoginUserAnalysis {

    private String loginNameAnalysis;
    private String phoneAnalysis;
    private Integer topRoleTypeAnalysis;
}

@GetMapping("doGetTest")
public  String doGetTest(@LoginUserX LoginUserAnalysis loginUserAnalysis,String queryName){
    System.out.println("接收到的参数："+queryName);
    System.out.println("默认填充的参数"+loginUserAnalysis.toString());
    return "ok";
}

@PostMapping("doPostTest")
public  void doPostTest(@LoginUserX LoginUserAnalysis loginUserAnalysis, @RequestBody Car car){
    System.out.println("接收到的参数："+car.toString());
    System.out.println("默认填充的参数"+loginUserAnalysis.toString());
}