查询天气预报系统之---API网关的意义(十二-2)

最新推荐文章于 2025-11-13 12:03:46 发布

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#API网关

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博客介绍了新建springBoot-eureka-client-zuul项目，包括项目结构、pom文件、controller层、启动类和配置文件等内容。启动相关服务后访问特定链接验证项目是否成功，还指出可能出现的500错误，原因是redis无数据，解决办法是将数据存入Redis。

新建项目：springBoot-eureka-client-zuul

项目结构：

pom文件：

<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.csq.study</groupId>
  <artifactId>springBoot-eureka-client-zuul</artifactId>
  <version>0.0.1-SNAPSHOT</version>
<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
			<version>1.5.14.RELEASE</version>
	</parent>
	
	<properties>
		<java.version>1.8</java.version>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<spring.cloud.version>Edgware.SR5</spring.cloud.version>
	    <quartz.version>2.0.0.RELEASE</quartz.version>
	</properties>
	
	<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>
<dependencies>
        <dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>

    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-eureka-server</artifactId>
    </dependency>
    <!-- Eureka服务-->
		<dependency>
		    <groupId>org.springframework.cloud</groupId>
		    <artifactId>spring-cloud-starter-eureka</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-config</artifactId>
		</dependency>
		
		<dependency>
         <groupId>org.springframework.cloud</groupId>
         <artifactId>spring-cloud-starter-feign</artifactId>
        </dependency>	
        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-netflix-zuul -->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
</dependency>
</dependencies>
</project>

controller层：

package com.csq.study.springboot.controller;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;


@RestController
@RequestMapping("/demo")
public class CityController {

	@RequestMapping(value="/hello", method=RequestMethod.GET)
	public String listCity() {

		return "hello world zuul";
	}

}

启动类：

package com.csq.study.springboot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;

/*
 * @SpringBootApplication注解声明Spring Boot应用
 * 作用等同于@Configuration, @EnableAutoConfiguration, @ComponentScan，
 * 简化Spring配置
*/
@SpringBootApplication
@EnableDiscoveryClient
@EnableZuulProxy
public class Application {
  public static void main(String[] args) {
	  
	  SpringApplication.run(Application.class, args);
}
}

配置文件：

#端口号
server.port=8086

#应用名称
spring.application.name=springBoot-eureka-client-zuul

#注册服务器的URL
eureka.client.service-url.defaultZone=http://localhost:8762/eureka/
#测试
zuul.routes.hi.path: /hh/**
zuul.routes.hi.serviceId: springBoot-eureka-client

##传统路由配置：不依赖服务发现。
## 所有以myapi开头的url路由至http://127.0.0.1:8088/下
#zuul.routes.myApi.path=/myapi/**
#zuul.routes.myApi.url=http://127.0.0.1:8088

#forward模式 直接转发至zuul提供的rest服务
#zuul.routes.myDemo.path=/myDemo/**
#zuul.routes.myDemo.url=forward:/demo

zuul.routes.city.path=/city/**
zuul.routes.city.serviceId=springBoot-city

zuul.routes.data.path=/data/**
zuul.routes.data.serviceId=springBoot-data



#请求服务时的超时时间
#feign.client.config.feignName.connect-timeout=5000

#读数据时的超时时间
#feign.client.config.feignName.read-timeout=5000
#feign.hystrix.enabled: false

分别启动注册中心、redis、springBoot-data、springBoot-city 、springBoot-report-feign-gateway、和本项目，然后访问：

http://localhost:8080/weather/cityId/101010400 出现如下截图代表成功

容易出现错误：
status 500 reading DataClient#getDataByCityId(String); content:
{"timestamp":1561010095189,"status":500,"error":"Internal Server Error","exception":"java.lang.RuntimeException","message":"没有相应天气信息","path":"/weather/cityId/101280601"}

报错原因：如果报这种错误那是因为redis没有数据，需要先在redis中存一份

解决办法：启动redis缓存服务，在这里访问：http://localhost:8080/weather/cityId/101010400，，把这个id的数据放Redis中一份就可以了。