第五章 SpringCloud之Eureka-Client使用RestTemplate实现服务之间的调用

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注意：这个章节，请结合前几章节一起使用，因为其要调用上一章节的服务

1、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>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.1.3.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <groupId>com.test</groupId>

    <artifactId>eureka-client-movie</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <name>eureka-client-movie</name>

    <description>Demo project for Spring Boot</description>

    <properties>

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

        <spring-cloud.version>Greenwich.SR1</spring-cloud.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>

        </dependency>

        <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>${spring-cloud.version}</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>

</project>

2、添加application.yml配置

server:

  port: 8664

user:

  userServicePath: http://localhost:8663/user/

spring:

  application:

    name: eureka-client-movie

eureka:

  instance:

    hostname: localhost

    prefer-ip-address: true

    instance-id: ${spring.application.name}:${spring.application.instance_id:${server.port}}

  client:

    serviceUrl:

      defaultZone: http://${eureka.instance.hostname}:8661/eureka

3、在启动类添加注解

package com.test.eurekaclientmovie;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

import org.springframework.context.annotation.Bean;

import org.springframework.web.client.RestTemplate;

@SpringBootApplication

@EnableEurekaClient

public class EurekaClientMovieApplication {

    @Bean

    public RestTemplate restTemplate(){

        return new RestTemplate();

    }

    public static void main(String[] args) {

        SpringApplication.run(EurekaClientMovieApplication.class, args);

    }

}

4、MovieController.java

package com.test.eurekaclientmovie.controller;

import com.test.eurekaclientmovie.entity.User;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.beans.factory.annotation.Value;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.PathVariable;

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

import org.springframework.web.client.RestTemplate;

@RestController

public class MovieController {

    @Autowired

    private RestTemplate restTemplate;

    @Value("${user.userServicePath}")

    private String userServicePath;

   /* @Autowired

    private  LoadBalancerClient loadBalancerClient;*/

    @GetMapping("/movie/{id}")

    public User findById(@PathVariable Long id) {

        //请用虚拟ip

        return restTemplate.getForObject(this.userServicePath+id, User.class);

    }

    /**

     * 配置单一的方法进行轮询

     * @return

     *//*

    @GetMapping("/test")

    public String test() {

        //请用虚拟ip

        ServiceInstance serviceInstance =loadBalancerClient.choose("eureka-client-user");

        System.out.println(serviceInstance.getHost()+":"+serviceInstance.getPort());

        return "1";

    }*/

}

5、User.java

package com.test.eurekaclientmovie.entity;

import java.io.Serializable;

import java.math.BigDecimal;

public class User implements Serializable {

    private  Long id;

    private  String name;

    private  String username;

    private  BigDecimal balance;

    private  short age;

    public Long getId() {

        return id;

    }

    public void setId(Long id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getUsername() {

        return username;

    }

    public void setUsername(String username) {

        this.username = username;

    }

    public BigDecimal getBalance() {

        return balance;

    }

    public void setBalance(BigDecimal balance) {

        this.balance = balance;

    }

    public short getAge() {

        return age;

    }

    public void setAge(short age) {

        this.age = age;

    }

}