[Spring Cloud] RestTemplate跨进程调用

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衔接上篇: [Spring Cloud] Eureka Server安装_沫洺的博客-CSDN博客

🌹创建子模块

注意创建的子模块要在父模块的pom.xml中声明一下 

子模块spring-cloud-eureka-a

 pom文件如下

"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>4.0.0modelVersion>
    <parent>
        <groupId>com.mominggroupId>
        <artifactId>spring-cloud-rootartifactId>
        <version>0.0.1-SNAPSHOTversion>
        <relativePath>../pom.xmlrelativePath>
    parent>
 
    <artifactId>spring-cloud-eureka-aartifactId>
 
    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-netflix-eureka-clientartifactId>
        dependency>
 
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
    dependencies>
 
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
            plugin>
        plugins>
    build>
 
project>

application.properties建立a应用

server.port = 9091
spring.application.name = a
eureka.client.service-url.defaultZone=http://ek1.cn:8001/eureka/,http://ek2.cn:8002/eureka/

创建测试接口controller/A

@RestController
public class A {
    @GetMapping("/a/test")
    public String test(@RequestParam(value = "name",required = false) String name){
        return "这是A应用返回的接口,参数为: "+name;
    }
}

启动项目，即可查看服务注册成功

 访问a应用

 子模块spring-cloud-eureka-b

创建同理

pom.xml

"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>4.0.0modelVersion>
    <parent>
        <groupId>com.mominggroupId>
        <artifactId>spring-cloud-rootartifactId>
        <version>0.0.1-SNAPSHOTversion>
        <relativePath>../pom.xmlrelativePath>
    parent>
 
    <artifactId>spring-cloud-eureka-bartifactId>
 
    <dependencies>
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-webartifactId>
        dependency>
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-netflix-eureka-clientartifactId>
        dependency>
 
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
    dependencies>
 
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
            plugin>
        plugins>
    build>
 
project>

application.properties建立b应用

server.port = 9092
spring.application.name = b
#注册中心
eureka.client.service-url.defaultZone=http://ek1.cn:8001/eureka/,http://ek2.cn:8002/eureka/

启动类添加@EnableDiscoveryClient注解

@SpringBootApplication
//能从服务中心拉东西
@EnableDiscoveryClient
public class App {
    public static void main(String[] args) {
        SpringApplication.run(App.class, args);
    }
}

注册RestTemplate，代码如下

@Configuration
public class RestTemplateConfig {
    @Bean
    @LoadBalanced//负载均衡功能
    public RestTemplate restTemplate(){
        return new RestTemplate();
    }
}

创建测试接口controller/B.调用a服务对应接口

@RestController
public class B {
 
    @Autowired
    private RestTemplate restTemplate;
    @GetMapping("/b/test")
    public String test(@RequestParam(value = "nickName",required = false) String nickName){
        //希望访问到A的应用
        String ret = restTemplate.getForObject("http://a/a/test?name=张三", String.class);
        return ret+"的小名: "+nickName;
    }
}

同时运行A,B服务

访问b应用,调用a服务对应接口成功