Spring Cloud入门教程之Zuul实现API网关与请求过滤

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>

 <groupId>cn.zxuqian</groupId>
 <artifactId>apiGateway</artifactId>
 <version>1.0-SNAPSHOT</version>

 <parent>
  <groupId>org.springframework.boot</groupId>
  <artifactId>spring-boot-starter-parent</artifactId>
  <version>2.0.1.RELEASE</version>
 </parent>

 <dependencies>
  <dependency>
   <groupId>org.springframework.cloud</groupId>
   <!-- name has changed, before: spring-cloud-starter-zuul -->
   <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
  </dependency>
  <dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
  </dependency>
  <dependency>
   <groupId>org.springframework.cloud</groupId>
   <artifactId>spring-cloud-starter-config</artifactId>
  </dependency>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-actuator</artifactId>
  </dependency>
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-web</artifactId>
  </dependency>
 </dependencies>

 <dependencyManagement>
  <dependencies>
   <dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-dependencies</artifactId>
    <version>Finchley.M9</version>
    <type>pom</type>
    <scope>import</scope>
   </dependency>
  </dependencies>
 </dependencyManagement>

 <properties>
  <java.version>1.8</java.version>
 </properties>


 <build>
  <plugins>
   <plugin>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-maven-plugin</artifactId>
   </plugin>
  </plugins>
 </build>

 <repositories>
  <repository>
   <id>spring-milestones</id>
   <name>Spring Milestones</name>
   <url>https://repo.spring.io/libs-milestone</url>
   <snapshots>
    <enabled>false</enabled>
   </snapshots>
  </repository>
 </repositories>
</project>

spring:
 application:
 name: zuul-server

package cn.zxuqian;
import cn.zxuqian.filters.PreFilter;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;
import org.springframework.context.annotation.Bean;
@EnableZuulProxy
@EnableDiscoveryClient
@SpringBootApplication
public class Application {
 public static void main(String[] args) {
  SpringApplication.run(Application.class, args);
 }

 @Bean
 public PreFilter preFilter() {
  return new PreFilter();
 }
}

package cn.zxuqian.filters;
import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.servlet.http.HttpServletRequest;
public class PreFilter extends ZuulFilter {
 private static Logger log = LoggerFactory.getLogger(PreFilter.class);

 @Override
 public String filterType() {
  return "pre";
 }

 @Override
 public int filterOrder() {
  return 1;
 }

 @Override
 public boolean shouldFilter() {
  return true;
 }

 @Override
 public Object run() throws ZuulException {
  RequestContext ctx = RequestContext.getCurrentContext();
  HttpServletRequest request = ctx.getRequest();
  log.info(String.format("%s 方式请求 %s", request.getMethod(), request.getRequestURL().toString()));
  return null;
 }
}

server:
 port: 8083
zuul:
 routes:
 products:
  path: /product/**
  serviceId: product-service

@RequestMapping("/list")
public String productList() {
 log.info("Access to /products endpoint");
 return "外套，夹克，毛衣，T恤";
}

public String productListZuul() {
 return this.restTemplate.getForObject("http://zuul-server/product/list", String.class);
}

@RequestMapping("/product/list")
public String productListZuul() {
 return productService.productListZuul();
}