SpringCloud服务间调用的两种方式

曾经终败给现在 2023-07-07 05:59 36阅读 0赞

项目地址: 链接：https://pan.baidu.com/s/1Mxo0ltvZbpz\_r8mCU-mSpw   
提取码：3j4a

### 1.Feight声明式客户端工具调用调用    ###

1.新建order项目 pom.xml ,order调用member服务 , member服务为正常服务,这里不粘贴了

<?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">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.2.4.RELEASE</version>
            <relativePath/> 
        </parent>
        <groupId>com.zhang</groupId>
        <artifactId>order</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>order</name>
        <description>Demo project for Spring Boot</description>
    
        <properties>
            <java.version>1.8</java.version>
            <spring-cloud.version>Hoxton.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-client</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
                <exclusions>
                    <exclusion>
                        <groupId>org.junit.vintage</groupId>
                        <artifactId>junit-vintage-engine</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-openfeign</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>
            </dependencies>
        </dependencyManagement>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

2.   新建接口 FeignAPI调用接口 , 编写调用member服务的接口, 此处请求地址和方法,皆和member服务Controller接口请求                 地址请求方法一致

@FeignClient(name = "member") //@FeignClient 调用服务接口 name 就是被调用的服务名称
    public interface FeightAPI {
    
        //Feign 书写方式以springMVC接口形式书写
        @GetMapping("/getMember")
        public String getMember();
    }

3. 新建Controller类,注入FeignAPI ,调用接口

@RestController
    public class FeignController {
    
        @Autowired
        private FeightAPI feightAPI;
        
        //Feign调用
        @GetMapping("/feignToMember")
        public String feignToMember(){
          return  feightAPI.getMember();
        }
    }

4.启动类开启Feign客户端注解

@SpringBootApplication
    @EnableEurekaClient  //开启Eureka客户端
    @EnableFeignClients  //开启Feign客户单调用
    public class OrderApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(OrderApplication.class, args);
        }
    
    }

5.访问接口,调用成功

### ![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nc2hlbmdxaWFuZzE2OA_size_16_color_FFFFFF_t_70][]   2.RestTemplate调用   ###

注意:需要@bean初始化RestTemplate对象 ,默认为负载均衡,故初始化需要加@LoadBalanced  
    初始化RestTemplate对象示例:  
        @Bean @LoadBalanced  
        RestTemplate restTemplate()\{  
            return new RestTemplate();  
        \}  
    调用方式示例: String memberUrl="http://app-itmayi-member/getMember";  //http"//+服务名/+请求地址  
                  restTemplate.getForObject(memberUrl,String.class); //请求地址 , 返回类型

1.初始化RestTemplat对象

@Bean
    @LoadBalanced  //客户端负载均衡
    RestTemplate restTemplate(){
        return new RestTemplate();
    }

2.注入RestTemplate ,调用member服务

@Autowired
    private RestTemplate restTemplate;
    
    //RestTemplate 调用
    @GetMapping("/restToMember")
    public String restToMember(){
       String memberUrl="http://member/getMember";  //http"//+服务名/+请求地址
       return restTemplate.getForObject(memberUrl,String.class); //请求地址 , 返回类型
    }
    
    @Bean
    @LoadBalanced//客户端负载均衡
    RestTemplate restTemplate(){
       return new RestTemplate();
    }

3.访问接口,调用成功

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3poYW5nc2hlbmdxaWFuZzE2OA_size_16_color_FFFFFF_t_70 1][]

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