這篇文章主要介紹了SpringBoot+SpringCloud實現登入使用者資訊在微服務之間的傳遞,文中通過示例程式碼介紹的非常詳細，對大家的學習或者工作具有一定的參考學習價值,需要的朋友可以參考下

實現思路：

1：準備一個ThreadLocal變數，供執行緒之間共享。

2：每個微服務對所有過來的Feign呼叫進行過濾，然後從請求頭中獲取User使用者資訊，並存在ThreadLocal變數中。

3：每個微服務在使用FeignClient呼叫別的微服務時，先從ThreadLocal裡面取出user資訊，並放在request的請求頭中。

4：封裝為一個註解，在啟動類上標記即可。

程式碼樣例：

1：ThreadLocal工具類 ：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：準備承載使用者資訊的userInfo實體類（程式碼略）

3：編寫攔截器 ： 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) {
    //從應用上下文中取出user資訊，放入Feign的請求頭中
    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("使用者資訊設定錯誤",e);
      }
    }
  }
}

4：編寫過濾器：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);
        //將UserInfo放入上下文中
        UserInfoContext.setUser(userInfo);
      } catch (UnsupportedEncodingException e) {
        log.error("init userInfo error",e);
      }
    }
  }

  @Override
  public void destroy() {
  }
}

5：編寫註解實現類： 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 在業務端通過註解EanbleUserInfoTransmitter載入
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：編寫註解 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：在啟動類上標記註解即可使用（無侵入）

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")
@EnableUserInfoTransmitter
public class TestCommonClient {

  public static void main(String[] args){

    SpringApplication.run(TestCommonClient.class,args);
  }
}

以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援我們。