服务网关 Zuul 自定义Filter

本文主要是介绍服务网关 Zuul 自定义Filter，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！

<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>com.tszr</groupId>
    <artifactId>mango-zuul</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
    </parent>

    <name>mango-hystrix</name>
    <description>mango-zuul</description>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
        <spring.boot.admin.version>2.0.3</spring.boot.admin.version>
    </properties>


    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.hibernate.validator</groupId>
                    <artifactId>hibernate-validator</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-consul-discovery</artifactId>
        </dependency>
        
        <!--actuator -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <!--spring-boot-admin -->
        <dependency>
            <groupId>de.codecentric</groupId>
            <artifactId>spring-boot-admin-starter-client</artifactId>
            <version>${spring.boot.admin.version}</version>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

server:
  port: 8010
  
spring:
  application:
    name: mango-zuul
  cloud:
    consul:
      host: localhost
      port: 8500
      discovery:
        service-name: ${spring.application.name}
  boot:
    admin:
      client:
        url:
        - "http://localhost:8088"
        
# 开放健康检查接口
management:
  endpoints:
    web:
      exposure:
        include: "*"
  endpoint:
    health:
      show-details: ALWAYS
        
zuul:
  routes:
    ribbon:
      path: /ribbon/**
      serviceId: mango-consumer  # 转发到消费者 /ribbon/
    feign:
      path: /feign/**
      serviceId: mango-consumer  # 转发到消费者 /feign/

package com.tszr;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import com.netflix.zuul.ZuulFilter;
import com.netflix.zuul.context.RequestContext;
import com.netflix.zuul.exception.ZuulException;

@Component
public class MyFilter extends ZuulFilter {
    private static Logger log = LoggerFactory.getLogger(MyFilter.class);

    @Override
    public String filterType() {
        return "pre"; // 定义filter的类型，有pre、route、post、error四种
    }

    @Override
    public int filterOrder() {
        return 0; // 定义filter的顺序，数字越小表示顺序越高，越先执行
    }

    @Override
    public boolean shouldFilter() {
        return true; // 表示是否需要执行该filter，true表示执行，false表示不执行
    }

    @Override
    public Object run() throws ZuulException {
        // filter需要执行的具体操作
        RequestContext ctx = RequestContext.getCurrentContext();
        HttpServletRequest request = ctx.getRequest();
        String token = request.getParameter("token");
        System.out.println(token);
        if (token == null) {
            log.warn("there is no request token");
            ctx.setSendZuulResponse(false);
            ctx.setResponseStatusCode(401);
            try {
                ctx.getResponse().getWriter().write("there is no request token");
            } catch (IOException e) {
                e.printStackTrace();
            }
            return null;
        }
        log.info("ok");
        return null;
    }
}

package com.tszr;

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;

@EnableDiscoveryClient
@EnableZuulProxy
@SpringBootApplication
public class MangoZuulApplication {
    public static void main(String[] args) {
        SpringApplication.run(MangoZuulApplication.class, args);
    }
}