SpringBoot+SpringCloud用户信息微服务传递实现解析

2019-11-26 08:21:18

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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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