Feign服务调服务传递数据带token验证
Feign服务调服务就不多做介绍了,值得提醒的是,Feign服务调服务传递数据的时候,比如某用户服务是需要带token验证的,而调用那个用户服务的时候报错,提示token为空,是因为Feign请求的时候没有带上token
解决方式
要解决这个问题,想必能猜到最方便的就是往请求头里加上token,一起带过去
Feign有提供一个接口,RequestInterceptor
只要实现这个接口,简单做一些处理,比如说我们验证请求头的token叫Access-Token,我们就先取出当前请求的token,然后放到feign请求头上
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import feign.RequestInterceptor;
import feign.RequestTemplate;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
import javax.servlet.http.HttpServletRequest;
/**
* Feign配置
* 使用FeignClient进行服务间调用,传递headers信息
*/
@Configuration
public class FeignConfig implements RequestInterceptor {
@Override
public void apply(RequestTemplate requestTemplate) {
ServletRequestAttributes attributes = (ServletRequestAttributes)RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
//添加token
requestTemplate.header( "Access-Token" , request.getHeader( "Access-Token" ));
}
}
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这样已经成功往Feign请求头里加上了Token,还可以这样,为了方便本地调试,可以在Spring Boot加上过滤器,每次本地调用没有Token的时候加上一个,只要实现Spring提供的Filter接口
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import org.apache.commons.lang3.StringUtils;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import java.io.IOException;
/**
* 每次请求过滤器拦截加Token
*/
public class AddTokenFilter implements Filter {
/**
* superAdmin
*/
private static final String DEFAULT_TOKEN = "你的token" ;
private String profilesActive;
public AddTokenFilter(String profilesActive) {
super ();
this .profilesActive = profilesActive;
}
@Override
public void init(FilterConfig filterConfig) throws ServletException {
}
@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
//判断是开发模式(dev)还是生产坏境(pro)
//如果不是开发坏境,不做任何操作,是开发坏境,往本地测试的request加请求头
if (profilesActive == null || !EnumEnvType.DEV.toString().equalsIgnoreCase(profilesActive)) {
filterChain.doFilter(servletRequest, servletResponse);
return ;
}
filterChain.doFilter( new CustomeizedRequest((HttpServletRequest) servletRequest), servletResponse);
}
@Override
public void destroy() {
}
//继承HttpServletRequestWrapper ,重写getHeader获取请求头的值
private class CustomeizedRequest extends HttpServletRequestWrapper {
/**
* Constructs a request object wrapping the given request.
*
* @param request
* @throws IllegalArgumentException if the request is null
*/
public CustomeizedRequest(HttpServletRequest request) {
super (request);
}
@Override
public String getHeader(String name) {
if (!Constant.HTTP_HEADER_ACCESS_TOKEN.equalsIgnoreCase(name)) {
return super .getHeader(name);
}
String token = super .getHeader(name);
return StringUtils.isNotBlank(token) ? token : DEFAULT_TOKEN;
}
}
}
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使用这个Filter很简单,新建一个WebMvcConfig类,配置一个bean
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import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;
import com.uhope.rl.watersource.filter.AddTokenFilter;
import com.uhope.rl.watersource.filter.ServiceFilter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.web.HttpMessageConverters;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import java.nio.charset.Charset;
/**
* Spring MVC 配置
* @author chenbin on 2017/12/25
* @version 3.0.0
*/
@Configuration
public class WebMvcConfig extends WebMvcConfigurerAdapter {
private final Logger logger = LoggerFactory.getLogger(WebMvcConfig. class );
/**
* 当前激活的配置文件
*/
@Value ( "${spring.profiles.active}" )
private String env;
/**
* 解决路径资源映射问题
*
* @param registry
*/
@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler( "swagger-ui.html" ).addResourceLocations( "classpath:/META-INF/resources/" );
registry.addResourceHandler( "/webjars/**" ).addResourceLocations( "classpath:/META-INF/resources/webjars/" );
registry.addResourceHandler( "/static/**" ).addResourceLocations( "classpath:/static/" );
}
/**
* 使用fastJson代替Jackjson解析JSON数据
*
* @return
*/
@Bean
public HttpMessageConverters fastJsonHttpMessageConverters() {
FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
FastJsonConfig fastJsonConfig = new FastJsonConfig();
/*
* 转换为JSON字符串,默认:
* WriteNullListAsEmpty List字段如果为null,输出为[],而非null
* WriteNullStringAsEmpty 字符类型字段如果为null,输出为”“,而非null
* WriteMapNullValue 是否输出值为null的字段,默认为false
*/
fastJsonConfig.setSerializerFeatures(SerializerFeature.WriteNullListAsEmpty, SerializerFeature.WriteNullStringAsEmpty, SerializerFeature.WriteMapNullValue, SerializerFeature.WriteDateUseDateFormat);
fastConverter.setFastJsonConfig(fastJsonConfig);
fastConverter.setDefaultCharset(Charset.forName( "UTF-8" ));
HttpMessageConverter<?> converter = fastConverter;
return new HttpMessageConverters(converter);
}
/**
* 这个Filter 解决页面跨域访问问题
*/
@Bean
public FilterRegistrationBean omsFilter() {
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter( new ServiceFilter());
registration.addUrlPatterns( "/*" );
registration.setName( "MainFilter" );
registration.setAsyncSupported( true );
registration.setOrder( 1 );
return registration;
}
/**
* 这个Filter 添加token
*/
@Bean
public FilterRegistrationBean addTokenFilter(){
FilterRegistrationBean registration = new FilterRegistrationBean();
registration.setFilter( new AddTokenFilter(env));
registration.addUrlPatterns( "/*" );
registration.setName( "addTokenFilter" );
registration.setAsyncSupported( true );
registration.setOrder( 2 );
return registration;
}
}
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小结一下
这样就实现了开发坏境下添加本地测试的token,若不是开发坏境,用网页请求过来的token,很方便,也解决了Feign丢失请求头的问题
Feign调用进行token鉴权
1、项目场景
这边使用 两个springboot应用,中间通过feign来进行远程调用(是的没错,架构就是这么奇葩)。然后在调用feign的时候,希望可以进行token鉴权。
2、解决办法
请求进来时,通过拦截器,校验header的token,然后在业务中调用feignClient时,通过新加一个feign拦截器,拦截feign请求,把当前的header中的token添加到feign的请求头中去。实现token在链路中的传递。
3、具体实现
新增 feign 拦截器配置
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/**
* Feign请求拦截器配置.
*
* @author linzp
* @version 1.0.0
* @date 2021/4/16 21:19
*/
@Configuration
public class FeignInterceptorConfig implements RequestInterceptor {
public FeignInterceptorConfig() {}
@Override
public void apply(RequestTemplate template) {
ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
HttpServletRequest request = attributes.getRequest();
//设置token到请求头
template.header(ConstantCommon.HEADER_TOKEN_KEY, request.getHeader(ConstantCommon.HEADER_TOKEN_KEY));
}
}
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然后在feignClient接口中,添加 == configuration = FeignInterceptorConfig.class==
注意有Bug!!!
注意!!!,这里会有个异常,获取到的request会是null。原因是hytrix隔离策略是thread,无法读到 threadLocal变量。
解决办法!!更改策略
在配置文件中新增如下配置,即可解决!
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# 更换hystrix策略,解决无法传递threadLocal变量问题
hystrix:
command:
default :
execution:
isolation:
strategy: SEMAPHORE
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以上为个人经验,希望能给大家一个参考,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/m0_37701381/article/details/82023076