本文共 5397 字，大约阅读时间需要 17 分钟。

一、在前面的基础上新建个module，service-zuul。

 1.1、在父工程下添加该module

           
    
     eureka-server
            
    
     eureka-client
            
    
     service-ribbon
            
    
     service-feign
            
    
     service-zuul
        
   

 1.2、在service.zuul工程下设置与父工程的关系，该pom.xml如下所示：

   
       
    
     4.0.0
        
    
     service-zuul
        
    
     0.0.1-SNAPSHOT
        
    
     jar
        
    
     service-zuul
        
    
     zuul for Spring Boot
        
            
     
      com.example
             
     
      chapter2
             
     
      0.0.1-SNAPSHOT
         
        
            
     
      UTF-8
             
     
      UTF-8
             
     
      1.8
         
        
            
             
                 
      
       org.springframework.cloud
                  
      
       spring-cloud-starter-netflix-eureka-client
              
         
             
                 
      
       org.springframework.cloud
                  
      
       spring-cloud-starter-netflix-zuul
              
         
        
            
                 
                      
       
        org.springframework.cloud
                       
       
        spring-cloud-dependencies
                       
       
        ${spring-cloud.version}
                       
       
        pom
                       
       
        import
                   
        
              
                  
       
        org.springframework.boot
                   
       
        spring-boot-devtools
                   
       
        true
               
              
         
        
            
                 
                      
       
        org.springframework.boot
                       
       
        spring-boot-maven-plugin
                   
              
         
        
            
                 
      
       spring-milestones
                  
      
       Spring Milestones
                  
      
       https://repo.spring.io/milestone
                  
                      
       
        false
                   
              
         
    
   

1.3、启动类ServiceZuulApplication配置如下：

package com.example;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.cloud.client.discovery.EnableDiscoveryClient;import org.springframework.cloud.netflix.eureka.EnableEurekaClient;import org.springframework.cloud.netflix.zuul.EnableZuulProxy;/** * @author xiaobu * @EnableZuulProxy 开启zuul功能 * 
 * 是如果选用的注册中心是eureka，那么就推荐@EnableEurekaClient， * 如果是其他的注册中心，那么推荐使用@EnableDiscoveryClient。 */@EnableEurekaClient@EnableDiscoveryClient@EnableZuulProxy@SpringBootApplicationpublic class ServiceZuulApplication {    public static void main(String[] args) {        SpringApplication.run(ServiceZuulApplication.class, args);    }}

1.4、配置文件application.properties内容如下

eureka.client.service-url.defaultZone=http://localhost:8001/eureka/server.port=8006#请求路径和服务名zuul.routes.xiaobu.path=/xiaobu/**zuul.routes.xiaobu.service-id=service-ribbon#请求路径和服务名zuul.routes.admin.path=/admin/**zuul.routes.admin.service-id=service-feignspring.application.name=service-zuul#热部署生效spring.devtools.restart.enabled=true

1.5访问出现如下结果：

1.6访问出现结果如下：

这样路由就起到效果了。

二、zuul还可以起到拦截的作用。

2.1、定义个MyFilter实现ZuulFilter.

package com.example.filter;import com.netflix.zuul.ZuulFilter;import com.netflix.zuul.context.RequestContext;import com.netflix.zuul.exception.ZuulException;import io.micrometer.core.instrument.util.StringUtils;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.stereotype.Component;import javax.servlet.http.HttpServletRequest;import java.io.IOException;/** * @author xiaobu * @version JDK1.8.0_171 * @date on  2018/11/7 14:28 * @description V1.0 zuul过滤器 */@Componentpublic class MyFilter extends ZuulFilter {    private static Logger logger = LoggerFactory.getLogger(MyFilter.class);    /**     * @author xiaobu     * @date 2018/11/7 14:57     * @return java.lang.String     * @descprition pre：路由之前  routing：路由之时 post： 路由之后 error：发送错误调用     * @version 1.0     */    @Override    public String filterType() {        return "pre";    }    /**     * @author xiaobu     * @date 2018/11/7 15:01     * @return int     * @descprition   过滤的顺序     * @version 1.0     */    @Override    public int filterOrder() {        return 0;    }    /**     * @author xiaobu     * @date 2018/11/7 14:59     * @return boolean     * @descprition  true表示为需要过滤     * @version 1.0     */    @Override    public boolean shouldFilter() {        return true;    }    @Override    public Object run() throws ZuulException {        RequestContext requestContext = RequestContext.getCurrentContext();        HttpServletRequest request=requestContext.getRequest();        String token=request.getParameter("token");        //字符串替换替换        logger.info(String.format("%s >>> %s", request.getMethod(), request.getRequestURL().toString()));        if(StringUtils.isBlank(token)){            requestContext.setSendZuulResponse(false);            requestContext.setResponseStatusCode(401);            try {                requestContext.getResponse().setContentType("text/html;charset=UTF-8");                requestContext.getResponse().getWriter().print("令牌是空的。");            } catch (IOException e) {                e.printStackTrace();            }        }        logger.info("ok");        return null;    }}

2.2、访问结果如下所示：

源码地址：

转载地址：http://eugai.baihongyu.com/