这篇文章主要介绍了SpringBoot+SpringCloud实现登录用户信息在微服务之间的传递,文中通过示例代码介绍的非常详细，对大家的学习或者工作具有一定的参考学习价值,需要的朋友可以参考下
实现思路：
1：准备一个ThreadLocal变量，供线程之间共享。
2：每个微服务对所有过来的Feign调用进行过滤，然后从请求头中获取User用户信息，并存在ThreadLocal变量中。
3：每个微服务在使用FeignClient调用别的微服务时，先从ThreadLocal里面取出user信息，并放在request的请求头中。
4：封装为一个注解，在启动类上标记即可。
代码样例：
1：ThreadLocal工具类 ：UserInfoContext
package com.test.domi.common.system;import com.test.domi.dao.UserInfo;public class UserInfoContext { private static ThreadLocal<UserInfo> userInfo = new ThreadLocal<UserInfo>(); public static String KEY_USERINFO_IN_HTTP_HEADER = "X-AUTO-FP-USERINFO"; public UserInfoContext() { } public static UserInfo getUser(){ return (UserInfo)userInfo.get(); } public static void setUser(UserInfo user){ userInfo.set(user); }}
2：准备承载用户信息的userInfo实体类（代码略）
3：编写拦截器 ： TransmitUserInfoFeighClientIntercepter
package com.test.domi.config;import com.alibaba.fastjson.JSON;import com.test.domi.common.system.UserInfoContext;import com.test.domi.dao.UserInfo;import feign.RequestInterceptor;import feign.RequestTemplate;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import java.io.UnsupportedEncodingException;import java.net.URLDecoder;public class TransmitUserInfoFeighClientIntercepter implements RequestInterceptor { private static final Logger log = LoggerFactory.getLogger(TransmitUserInfoFeighClientIntercepter.class); public TransmitUserInfoFeighClientIntercepter() { } @Override public void apply(RequestTemplate requestTemplate) { //从应用上下文中取出user信息，放入Feign的请求头中 UserInfo user = UserInfoContext.getUser(); if (user != null) { try { String userJson = JSON.toJSONString(user); requestTemplate.header("KEY_USERINFO_IN_HTTP_HEADER",new String[]{URLDecoder.decode(userJson,"UTF-8")}); } catch (UnsupportedEncodingException e) { log.error("用户信息设置错误",e); } } }}
4：编写过滤器：TransmitUserInfoFilter
package com.test.domi.config;import com.alibaba.fastjson.JSON;import com.test.domi.common.system.UserInfoContext;import com.test.domi.dao.UserInfo;import org.apache.commons.lang.StringUtils;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import javax.servlet.*;import javax.servlet.http.HttpServletRequest;import java.io.IOException;import java.io.UnsupportedEncodingException;import java.net.URLDecoder;public class TransmitUserInfoFilter implements Filter { private static final Logger log = LoggerFactory.getLogger(TransmitUserInfoFeighClientIntercepter.class); public TransmitUserInfoFilter() { } @Override public void init(FilterConfig filterConfig) throws ServletException { } @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { this.initUserInfo((HttpServletRequest)request); chain.doFilter(request,response); } private void initUserInfo(HttpServletRequest request){ String userJson = request.getHeader("KEY_USERINFO_IN_HTTP_HEADER"); if (StringUtils.isNotBlank(userJson)) { try { userJson = URLDecoder.decode(userJson,"UTF-8"); UserInfo userInfo = (UserInfo) JSON.parseObject(userJson,UserInfo.class); //将UserInfo放入上下文中 UserInfoContext.setUser(userInfo); } catch (UnsupportedEncodingException e) { log.error("init userInfo error",e); } } } @Override public void destroy() { }}
5：编写注解实现类： EnableUserInfoTransmitterAutoConfiguration
package spring.cloud.common.config;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import spring.cloud.common.interceptor.TransmitUserInfoFeighClientInterceptor;import spring.cloud.common.filter.TransmitUserInfoFilter;//@Configuration 在业务端通过注解EanbleUserInfoTransmitter加载public class EnableUserInfoTransmitterAutoConfiguration { public EnableUserInfoTransmitterAutoConfiguration() { } @Bean public TransmitUserInfoFeighClientInterceptor transmitUserInfo2FeighHttpHeader(){ System.out.println("-----TransmitUserInfoFeighClientInterceptor"); return new TransmitUserInfoFeighClientInterceptor(); } @Bean public TransmitUserInfoFilter transmitUserInfoFromHttpHeader(){ System.out.println("-----TransmitUserInfoFilter"); return new TransmitUserInfoFilter(); }}
6：编写注解 EnableUserInfoTransmitter
package com.test.domi.annotation;import com.test.domi.config.EnableUserInfoTransmitterAutoConfiguration;import org.springframework.context.annotation.Import;import java.lang.annotation.*;@Documented@Target({ElementType.TYPE})@Retention(RetentionPolicy.RUNTIME)@Import({EnableUserInfoTransmitterAutoConfiguration.class})public @interface EnableUserInfoTransmitter {}
7：在启动类上标记注解即可使用（无侵入）
package com.test.domi;import com.test.domi.annotation.EnableUserInfoTransmitter;import org.mybatis.spring.annotation.MapperScan;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;@EnableDiscoveryClient@SpringBootApplication@MapperScan("com.test.domi.dao")@EnableUserInfoTransmitterpublic class TestCommonClient { public static void main(String[] args){ SpringApplication.run(TestCommonClient.class,args); }}
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本文标题: SpringBoot+SpringCloud用户信息微服务传递实现解析
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