Springboot+springcloud to implement the transfer of login user information between microservices

Implementation ideas:

1: Prepare a threadlocal variable for sharing between threads.

2: Each micro-service filters all the feign calls that come in, and then gets the user information from the request header and exists in the threadlocal variable.

3: Each micro-service in the use of feignclient invoke other microservices, first remove the user information from the threadlocal, and placed in the request header.

4: Encapsulate as an annotation and mark it on the startup class.

Code Sample:

1:threadlocal Tool Class: Userinfocontext

 PackageCom.test.domi.common.system;ImportCom.test.domi.dao.UserInfo; Public classUserinfocontext {Private StaticThreadlocal<userinfo> UserInfo =NewThreadlocal<userinfo>();  Public StaticString Key_userinfo_in_http_header = "X-auto-fp-userinfo";  PublicUserinfocontext () {} Public StaticUserInfo GetUser () {return(UserInfo) userinfo.get (); }     Public Static voidsetUser (UserInfo user) {userinfo.set (user); }}

2: Prepare the UserInfo entity class that hosts user information (code slightly)

3: Writing interceptors: Transmituserinfofeighclientintercepter

 PackageCom.test.domi.config;ImportCom.alibaba.fastjson.JSON;ImportCom.test.domi.common.system.UserInfoContext;ImportCom.test.domi.dao.UserInfo;Importfeign. Requestinterceptor;Importfeign. Requesttemplate;ImportOrg.slf4j.Logger;Importorg.slf4j.LoggerFactory;Importjava.io.UnsupportedEncodingException;ImportJava.net.URLDecoder; Public classTransmituserinfofeighclientintercepterImplementsRequestinterceptor {Private Static FinalLogger log = Loggerfactory.getlogger (transmituserinfofeighclientintercepter.class);  PublicTransmituserinfofeighclientintercepter () {} @Override Public voidapply (Requesttemplate requesttemplate) {//Remove the user information from the application context and put it in the feign request headerUserInfo user =Userinfocontext.getuser (); if(User! =NULL) {            Try{String Userjson=json.tojsonstring (user); Requesttemplate.header ("Key_userinfo_in_http_header",NewString[]{urldecoder.decode (Userjson, "UTF-8")}); } Catch(unsupportedencodingexception e) {log.error ("User Information set Error", E); }        }    }}

4: Write Filter: Transmituserinfofilter

 PackageCom.test.domi.config;ImportCom.alibaba.fastjson.JSON;ImportCom.test.domi.common.system.UserInfoContext;ImportCom.test.domi.dao.UserInfo;Importorg.apache.commons.lang.StringUtils;ImportOrg.slf4j.Logger;Importorg.slf4j.LoggerFactory;Importjavax.servlet.*;Importjavax.servlet.http.HttpServletRequest;Importjava.io.IOException;Importjava.io.UnsupportedEncodingException;ImportJava.net.URLDecoder; Public classTransmituserinfofilterImplementsFilter {Private Static FinalLogger log = Loggerfactory.getlogger (transmituserinfofeighclientintercepter.class);  PublicTransmituserinfofilter () {} @Override Public voidInit (Filterconfig filterconfig)throwsservletexception {} @Override Public voidDoFilter (ServletRequest request, servletresponse response, Filterchain chain)throwsIOException, servletexception { This. Inituserinfo ((httpservletrequest) request);    Chain.dofilter (Request,response); }    Private voidInituserinfo (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); //put UserInfo into contextUserinfocontext.setuser (UserInfo); } Catch(unsupportedencodingexception e) {log.error ("Init userInfo Error", E); } }} @Override Public voiddestroy () {}}

5: Write the annotation implementation class: Enableuserinfotransmitterautoconfiguration

 PackageCom.test.domi.config;ImportOrg.springframework.context.annotation.Bean;Importorg.springframework.context.annotation.Configuration; @Configuration Public classenableuserinfotransmitterautoconfiguration { Publicenableuserinfotransmitterautoconfiguration () {} @Bean PublicTransmituserinfofeighclientintercepter Transmituserinfo2feighhttpheader () {return NewTransmituserinfofeighclientintercepter (); } @Bean PublicTransmituserinfofilter Transmituserinfofromhttpheader () {return NewTransmituserinfofilter (); }}

6: Writing Annotations 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: Mark Annotations on the Startup class (no intrusion)

 PackageCom.test.domi;ImportCom.test.domi.annotation.EnableUserInfoTransmitter;ImportOrg.mybatis.spring.annotation.MapperScan;Importorg.springframework.boot.SpringApplication;Importorg.springframework.boot.autoconfigure.SpringBootApplication;Importorg.springframework.cloud.client.discovery.enablediscoveryclient;@ Enablediscoveryclient@springbootapplication@mapperscan ("Com.test.domi.dao")@EnableUserInfoTransmitter  Public classtestcommonclient { Public Static voidMain (string[] args) {Springapplication.run (testcommonclient.class, args); }}

Springboot+springcloud to implement the transfer of login user information between microservices