小技巧合集

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Spring MVC

返回数据时json处理忽略null字段

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spring:
  jackson:
    default-property-inclusion: non_null
    # 返回数据时json处理忽略null字段

Feign

解决服务A请求服务B需要登录验证等

这里配置了一个代理类, 在Feign请求时会执行它, 这时加上Cookies, 就实现了Feign携带Cookie请求, 有点类似AOP

  • FeignClient类

    添加@FeignClient(name = "user-service", configuration = FeignConfig.class)

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    package com.leyou.user.client;


    import com.leyou.auth.config.FeignConfig;
    import com.leyou.user.dto.AddressDTO;
    import com.leyou.user.dto.UserDTO;
    import org.springframework.cloud.openfeign.FeignClient;
    import org.springframework.web.bind.annotation.*;

    @FeignClient(name = "user-service", configuration = FeignConfig.class)
    public interface UserClient {

        /**
         * 根据手机号和密码查询用户
         * @param username 手机号
         * @param password 密码
         * @return 用户信息
         */
        @GetMapping("/info")
        UserDTO queryUserByPhoneAndPassword(
                @RequestParam("username") String username, @RequestParam("password") String password);



        /**
         * 根据收货地址id查询用户收货地址
         * @return 收货地址列表
         */
        @PostMapping("/info/address")
        AddressDTO queryAddressById(@RequestParam Long id);
    }

  • FeignConfig类

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package com.leyou.auth.config;

import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;

import javax.servlet.http.HttpServletRequest;
import java.util.Enumeration;


// 配置Feign, 设置token, 因为user中的有些地址需要检测用户是否登录
public class FeignConfig implements RequestInterceptor {
        @Override
        public void apply(RequestTemplate requestTemplate) {
            ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
            HttpServletRequest request = null;

            if (attributes != null) {
                request = attributes.getRequest();
                Enumeration<String> headerNames = request.getHeaderNames();
                while (headerNames.hasMoreElements()) {
                    String name = headerNames.nextElement();
                    if("cookie".equals(name)) {
                        Enumeration<String> values = request.getHeaders(name);
                        while (values.hasMoreElements()) {
                            String value = values.nextElement();
                            requestTemplate.header(name, value);
                        }
                    }
                }
            }

        }
    }