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Java（六）：Eureka项目搭建、数据请求_eureka java

作者：正经夜光杯 | 2024-08-13 11:34:31

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eureka java

Eureka项目搭建、数据请求

Eureka简介

Eureka采用的是Server/Client的模式进行设计。

Server扮演了服务注册中心的角色，为Client提供服务注册和发现的功能，维护着注册到自身的Client的相关信息，同时提供接口给Client获取到注册表中其他服务的信息。

Client将有关自己的服务的信息通过一定的方式登记到Server上，并在正常范围内维护自己信息的一致性，方便其他服务发现自己，同时可以通过Server获取到自己的依赖的其他服务信息，从而完成服务调用。

Eureka功能主要包括：服务注册、服务续约、服务剔除、服务下线、获取注册表信息、远程调用等。

以下是Eureka几个角色的解释：
- Eureka服务端：负责服务注册、发现并管理每项服务的中心。
- Eureka实例：服务（如订单系统）部署多个服务器，每个服务器上提供的服务都是实例。
- Eureka服务：指提供特定服务功能的服务，例如：订单系统，同一服务可以提供多个实例;
- Eureka客户端：主要向服务中心注册自己成为服务。但它既可以是服务提供者，也可以是消费者。它与Eureka实例感觉相似，但实际上意义不同。

Eureka项目创建

1、新建Maven项目

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2、只保留Maven项目的依赖文件

pom.xml文件作为后续创建的子模块依赖的父依赖文件

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3、创建子模块（Eureka服务模块）

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4、修改`pom.xml`

demo/pom.xml

<?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>com.example.demo</groupId>
    <artifactId>demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <packaging>pom</packaging>

    <modules>
        <module>demo-eureka</module>
    </modules>

    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.6.13</spring-boot.version>
        <spring-cloud.version>2021.0.5</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
    </dependencies>

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

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>${spring-boot.version}</version>
                <executions>
                    <execution>
                        <id>repackage</id>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>
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demo/demo-eureka/pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <parent>
        <groupId>com.example.demo</groupId>
        <artifactId>demo</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>
    <artifactId>demo-eureka</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo-eureka</name>
    <description>demo-eureka</description>

</project>
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5、创建并修改配置文件

demo/demo-eureka/src/main/resources/application.yml

server:
  port: 8000

spring:
  application:
    name: demo-eureka

eureka:
  instance:
    hostname: 127.0.0.1
  client:
    register-with-eureka: false   # 是否将自己注册到 Eureka-Server 中，默认的为 true
    fetch-registry: false         # 是否需要拉取服务信息，默认未true
    service-url:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/  # 注册中心地址
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6、添加Eureka注解

demo/demo-eureka/src/main/java/com/example/demo/demoeureka/DemoEurekaApplication.java

package com.example.demo.demoeureka;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class DemoEurekaApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoEurekaApplication.class, args);
    }

}
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7、运行

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8、创建其他服务

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9、修改`pom.xml`

demo/pom.xml

<packaging>pom</packaging>

<modules>
    <module>demo-eureka</module>
    <module>demo-one</module>
    <module>demo-two</module>
</modules>
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demo/demo-one/pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <parent>
        <groupId>com.example.demo</groupId>
        <artifactId>demo</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>
    <artifactId>demo-one</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo-one</name>
    <description>demo-one</description>

</project>
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demo/demo-two/pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <parent>
        <groupId>com.example.demo</groupId>
        <artifactId>demo</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>
    <artifactId>demo-two</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo-two</name>
    <description>demo-two</description>

</project>
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10、创建并修改配置文件

把服务注册到Eureka中

demo/demo-one/src/main/resources/application.yml

server:
  port: 8001

spring:
  application:
    name: demo-one

eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:8000/eureka/
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demo/demo-two/src/main/resources/application.yml

server:
  port: 8002

spring:
  application:
    name: demo-two

eureka:
  client:
    service-url:
      defaultZone: http://127.0.0.1:8000/eureka/
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11、添加Eureka注解

demo/demo-one/src/main/java/com/example/demo/demoone/DemoOneApplication.java

package com.example.demo.demoone;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@EnableEurekaClient
@SpringBootApplication
public class DemoOneApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoOneApplication.class, args);
    }

}
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demo/demo-two/src/main/java/com/example/demo/demotwo/DemoTwoApplication.java

package com.example.demo.demotwo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@EnableEurekaClient
@SpringBootApplication
public class DemoTwoApplication {

    public static void main(String[] args) {
        SpringApplication.run(DemoTwoApplication.class, args);
    }

}
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12、添加项目服务

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13、运行

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14、访问404解决

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开启监控服务配置demo/demo-one/src/main/resources/application.yml
开启监控服务配置demo/demo-two/src/main/resources/application.yml

management:
  endpoints:
    web:
      exposure:
        include: "*"
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在这里插入图片描述

15、项目目录结构

在这里插入图片描述

搭建Eureka集群

应对服务挂了找不到服务的问题

1、准备

SwitchHosts：用于修改 IP 和域名的映射

https://github.com/oldj/SwitchHosts/releases

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2. 创建 Eureka Server 模块

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demo/pom.xml

<packaging>pom</packaging>

<modules>
    <module>eureka-server-01</module>
    <module>eureka-server-02</module>
    <module>eureka-server-03</module>
    <module>eureka-client-01</module>
</modules>
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demo/eureka-server-01、demo/eureka-server-02、demo/eureka-server-03

启动类

demo/eureka-server-01/src/main/java/com/example/demo/eurekaserver01/EurekaServer01Application.java

package com.example.demo.eurekaserver01;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class EurekaServer01Application {
    public static void main(String[] args) {
        SpringApplication.run(EurekaServer01Application.class, args);
    }
}
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demo/eu¬reka-server-02/src/main/java/com/example/demo/eurekaserver01/EurekaServer02Application.java

package com.example.demo.eurekaserver02;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class EurekaServer02Application {
    public static void main(String[] args) {
        SpringApplication.run(EurekaServer02Application.class, args);
    }
}
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demo/eureka-server-03/src/main/java/com/example/demo/eurekaserver01/EurekaServer03Application.java

package com.example.demo.eurekaserver03;
  
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
  
@EnableEurekaServer
@SpringBootApplication
public class EurekaServer03Application {
  public static void main(String[] args) {
      SpringApplication.run(EurekaServer03Application.class, args);
  }
}
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配置项

demo/eureka-server-01/src/main/resources/application.yml

server:
port: 8001

spring:
application:
name: eureka-server-01

eureka:
instance:
hostname: www.eureka-server-01.com
client:
register-with-eureka: false   # 是否将自己注册到 Eureka-Server 中，默认的为 true
fetch-registry: false         # 是否需要拉取服务信息，默认未true
service-url:
  defaultZone: http://www.eureka-server-02.com:8002/eureka/,http://www.eureka-server-03.com:8003/eureka/ # 注册中心地址
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demo/eureka-server-02/src/main/resources/application.yml

server:
  port: 8002

spring:
  application:
    name: eureka-server-02

eureka:
  instance:
    hostname: www.eureka-server-02.com
  client:
    register-with-eureka: false   # 是否将自己注册到 Eureka-Server 中，默认的为 true
    fetch-registry: false         # 是否需要拉取服务信息，默认未true
    service-url:
      defaultZone: http://www.eureka-server-01.com:8001/eureka/,http://www.eureka-server-03.com:8003/eureka/ # 注册中心地址
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demo/eureka-server-03/src/main/resources/application.yml

server:
  port: 8003

spring:
  application:
    name: eureka-server-03

eureka:
  instance:
    hostname: www.eureka-server-03.com
  client:
    register-with-eureka: false   # 是否将自己注册到 Eureka-Server 中，默认的为 true
    fetch-registry: false         # 是否需要拉取服务信息，默认未true
    service-url:
      defaultZone: http://www.eureka-server-01.com:8001/eureka/,http://www.eureka-server-02.com:8002/eureka/ # 注册中心地址
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3、运行

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4、创建 Eureka Client 模块并注册到Eureka服务中

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启动类

demo/eureka-client-01/src/main/java/com/example/demo/eurekaclient01/EurekaClient01Application.java

package com.example.demo.eurekaclient01;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

@EnableEurekaClient
@SpringBootApplication
public class EurekaClient01Application {
    public static void main(String[] args) {
        SpringApplication.run(EurekaClient01Application.class, args);
    }
}
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配置项

demo/eureka-client-01/src/main/resources/application.yml

server:
  port: 8081

spring:
  application:
    name: eureka-client-01

eureka:
  instance:
    hostname: www.eureka-client-01.com
    instance-id: eureka-client-01
  client:
    service-url:
      defaultZone: http://www.eureka-server-01.com:8001/eureka/,http://www.eureka-server-02.com:8002/eureka/,http://www.eureka-server-03.com:8003/eureka/

management:
  endpoints:
    web:
      exposure:
        include: "*"
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5、运行

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6、项目目录结构

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网络请求获取数据

1、创建项目

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demo/pom.xml

<?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>com.example.demo</groupId>
    <artifactId>demo</artifactId>
    <version>1.0-SNAPSHOT</version>

    <packaging>pom</packaging>

    <modules>
        <module>service-01</module>
        <module>service-02</module>
    </modules>

    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.6.13</spring-boot.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

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

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>${spring-boot.version}</version>
                <executions>
                    <execution>
                        <id>repackage</id>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>
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demo/service-01/pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <parent>
        <groupId>com.example.demo</groupId>
        <artifactId>demo</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>
    <artifactId>service-01</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>service-01</name>
    <description>service-01</description>
   
</project>
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demo/service-02/pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">

    <parent>
        <groupId>com.example.demo</groupId>
        <artifactId>demo</artifactId>
        <version>1.0-SNAPSHOT</version>
    </parent>

    <modelVersion>4.0.0</modelVersion>
    <artifactId>service-02</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>service-02</name>
    <description>service-02</description>

</project>
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demo/service-01/src/main/resources/application.yml

server:
  port: 8001
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demo/service-02/src/main/resources/application.yml

server:
  port: 8002
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2、创建请求

demo/service-01/src/main/java/com/example/demo/service01/TestController.java

package com.example.demo.service01;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
@RequestMapping
public class TestController {

    private final RestTemplate restTemplate = new RestTemplate();

    @GetMapping("msg")
    public String msg() {
        return "service-01 服务中请求 service-02";
    }

    @GetMapping("say")
    public String say() {
        String html = restTemplate.getForObject("https://www.example.com/", String.class);
        String msg = restTemplate.getForObject("http://127.0.0.1:8002/msg", String.class);
        return String.format("%s<h1 style=\"text-align: center;\">%s</h1>", html, msg);
    }

}
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demo/service-01/src/main/java/com/example/demo/service01/TestController.java

package com.example.demo.service02;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
@RequestMapping
public class TestController {

    private final RestTemplate restTemplate = new RestTemplate();

    @GetMapping("msg")
    public String msg() {
        return "service-02 服务中请求 service-01";
    }

    @GetMapping("say")
    public String say() {
        String html = restTemplate.getForObject("https://www.example.com/", String.class);
        String msg = restTemplate.getForObject("http://127.0.0.1:8001/msg", String.class);
        return String.format("%s<h1 style=\"text-align: center;\">%s</h1>", html, msg);
    }

}
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3、运行

在这里插入图片描述

4、目录结构

在这里插入图片描述

利用Eureka实现服务间数据请求

在这里插入图片描述

1、创建项目

在这里插入图片描述

demo/pom.xml

<packaging>pom</packaging>

<modules>
    <module>eureka-server</module>
    <module>service-01</module>
    <module>service-02</module>
</modules>
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2、添加依赖

demo/pom.xml

<!-- 用于服务间请求的依赖 -->
<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-openfeign -->
<dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
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3、 `demo/eureka-server`

demo/eureka-server/src/main/resources/application.yml

server:
  port: 8001

spring:
  application:
    name: eureka-server

eureka:
  instance:
    hostname: www.eureka-server.com
  client:
    register-with-eureka: false   # 是否将自己注册到 Eureka-Server 中，默认的为 true
    fetch-registry: false         # 是否需要拉取服务信息，默认未true
    service-url:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/ # 注册中心地址
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demo/eureka-server/src/main/java/com/example/demo/eurekaserver/EurekaServerApplication.java

package com.example.demo.eurekaserver;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class EurekaServerApplication {

    public static void main(String[] args) {
        SpringApplication.run(EurekaServerApplication.class, args);
    }

}
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4、 `demo/service-01`

demo/service-01/src/main/resources/application.yml

server:
  port: 8081

spring:
  application:
    name: service-01

eureka:
  instance:
    hostname: www.eureka-server.com
    instance-id: service-01
  client:
    service-url:
      defaultZone: http://www.eureka-server.com:8001/eureka/

management:
  endpoints:
    web:
      exposure:
        include: "*"
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demo/service-01/src/main/java/com/example/demo/service01/Service01Application.java

package com.example.demo.service01;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class Service01Application {

    public static void main(String[] args) {
        SpringApplication.run(Service01Application.class, args);
    }

}
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demo/service-01/src/main/java/com/example/demo/service01/api/IService02.java

package com.example.demo.service01.api;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;

@FeignClient(value = "SERVICE-02")
public interface IService02 {
    @GetMapping("/getMsg")
    public String getMsg();
}
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demo/service-01/src/main/java/com/example/demo/service01/Service01Controller.java

package com.example.demo.service01;

import com.example.demo.service01.api.IService02;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
@RequestMapping
public class Service01Controller {

    @Resource
    private IService02 service02;

    @GetMapping("/say")
    public String say(){
        return service02.getMsg();
    }

    @GetMapping("getMsg")
    public String getMsg() {
        return "SERVICE-02 调用 SERVICE-01";
    }

}
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5、 `demo/service-02`

demo/service-02/src/main/resources/application.yml

server:
  port: 8082

spring:
  application:
    name: service-02

eureka:
  instance:
    hostname: www.eureka-server.com
    instance-id: service-02
  client:
    service-url:
      defaultZone: http://www.eureka-server.com:8001/eureka/

management:
  endpoints:
    web:
      exposure:
        include: "*"
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demo/service-02/src/main/java/com/example/demo/service02/Service02Application.java

package com.example.demo.service02;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients;

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class Service02Application {

    public static void main(String[] args) {
        SpringApplication.run(Service02Application.class, args);
    }

}
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demo/service-02/src/main/java/com/example/demo/service02/api/IService01.java

package com.example.demo.service02.api;

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;

@FeignClient(value = "SERVICE-01")
public interface IService01 {
    @GetMapping("/getMsg")
    public String getMsg();
}
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demo/service-02/src/main/java/com/example/demo/service02/Service02Controller.java

package com.example.demo.service02;

import com.example.demo.service02.api.IService01;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;

@RestController
@RequestMapping
public class Service02Controller {

    @Resource
    private IService01 service01;

    @GetMapping("/say")
    public String say(){
        return service01.getMsg();
    }

    @GetMapping("getMsg")
    public String getMsg() {
        return "SERVICE-01 调用 SERVICE-02";
    }

}
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6、运行

优先运行 EurekaServerApplication 启动类

在这里插入图片描述

7、目录结构

在这里插入图片描述

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Java（六）：Eureka项目搭建、数据请求_eureka java

Eureka项目搭建、数据请求

Eureka简介

Eureka项目创建

1、新建Maven项目

2、只保留Maven项目的依赖文件

3、创建子模块（Eureka服务模块）

4、修改pom.xml

5、创建并修改配置文件

6、添加Eureka注解

7、运行

8、创建其他服务

9、修改pom.xml

10、创建并修改配置文件

11、添加Eureka注解

12、添加项目服务

13、运行

14、访问404解决

15、项目目录结构

搭建Eureka集群

1、准备

2. 创建 Eureka Server 模块

3、运行

4、创建 Eureka Client 模块并注册到Eureka服务中

5、运行

6、项目目录结构

网络请求获取数据

1、 创建项目

2、 创建请求

3、 运行

4、 目录结构

利用Eureka实现服务间数据请求

1、 创建项目

2、 添加依赖

3、 demo/eureka-server

4、 demo/service-01

5、 demo/service-02

6、 运行

7、 目录结构

4、修改`pom.xml`

9、修改`pom.xml`

1、创建项目

2、创建请求

3、运行

4、目录结构

1、创建项目

2、添加依赖

3、 `demo/eureka-server`

4、 `demo/service-01`

5、 `demo/service-02`

6、运行

7、目录结构