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SpringBoot+SpringCloud用户信息微服务传递实现解析

2024-07-09 22:41:23
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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() {  }}
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