SpringCloud- 接口网关（zuul）

1.什么是网关

你们都知道，从一个房间走到另外一个房间，必然要通过一扇门。一样，从一个网络向另外一个网络发送信

息，也必须通过一道“关口”，这道关口就是网关。网关 就是一个网络链接到另外一个网络的“关口”。也就是网络关卡。例如：个人一个pc工程的ip地址：192.168.1.215 而后另外一个h5工程的ip地址是192.168.2.114 若是pc工程想调用h5

工程 属于不在同一个网段之中，跨域问题，须要搭建接口网关！

 

2.如何使用SpringCloud-zuul 搭建一个接口网关

 接口网关：拦截请求,nginx也有此做用，好比防止ddos攻击

 

 

 使用接口网关之后 pc工程只须要访问地址：www.zull.com/member 则直接有接口网关根据请求地址 直接找到 www.member.com 和nginx搭建企业网关相似

 

3.使用java代码实现接口网关

 建立项目：zuul-server

步骤一：pom文件导入所须要的依赖

<?xml-stylesheet type="text/xsl" href="XXX.xsl"?>
<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.jiahou</groupId>
    <artifactId>zull-server</artifactId>
    <version>0.0.1-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.2.RELEASE</version>
        <relativePath /> <!-- lookup parent from repository -->
    </parent>
    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <!--eureka server -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-ribbon</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zuul</artifactId>
        </dependency>
        <!-- spring boot test -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Dalston.RC1</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
    <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/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>


</project>

步骤二：建立zull-server的yml配置文件：

eureka: client: serviceUrl: defaultZone: http://localhost:8888/eureka/ server: port: 8799 spring: application: name: service-zuul zuul: routes: api-a: path: /api-member/** service-id: service-member api-b: path: /api-order/** service-id: service-order 

 

ps：path:就是地址请求路径 好比请求地址：127.0.0.1:8799/api-member/method 首先 访问zull服务  zull服务根据配置对全部/api-member/进行拦截，而后请求的地址对应的是eureka中service-member的实际地址

 

步骤三：在member服务和order服务中中添加测试方法：

 

@RequestMapping("/getMenberZull") public String getMemberMsg1() { String str = "这个是会员服务"; return str; }

@RequestMapping("/getMenberZull") public String getMemberMsg1() { String str = "这个是订单服务"; return str; }

 

 

步骤四：启动eureka,member,order,zull服务

 

 

 

 步骤五：分别输入请求地址：http://127.0.0.1:8799/api-member/getMenberZull和http://127.0.0.1:8799/api-order/getMenberZull

 

 

 

 

 

 

 

 

4.使用zull接口网关过滤请求参数

 在nginx里面能够搭建企业的黑白名单，过滤请求参数，spirngcloud中zull过滤请求参数

  建立一个本身的filter继承ZuulFilter

    

package com.example.demo; 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; @Component public class MyZuulFilter extends ZuulFilter { private static Logger log = LoggerFactory.getLogger(MyZuulFilter.class); @Override public String filterType() { return "pre"; } @Override public int filterOrder() { return 0; } public boolean shouldFilter() { return true; } public Object run() { RequestContext ctx = RequestContext.getCurrentContext(); HttpServletRequest request = ctx.getRequest(); log.info(String.format("当前接受方法类型:{}和请求地址", request.getMethod(), request.getRequestURL().toString())); Object accessToken = request.getParameter("id"); if (accessToken != null) { return null; } log.warn("当前没有任何参数"); ctx.setSendZuulResponse(false); ctx.setResponseStatusCode(401); try { ctx.getResponse().getWriter().write("id is null"); } catch (Exception e) { } return null; } }

 

 

 

 

 

 

 

 ps：nginx有的功能 zuul基本都有 

  纠正：zull->zuul