无法使用SpringBoot和RestTemplate为服务通信提供服务

Question

我有2个SpringBoot应用程序作为restful服务，当我尝试在这两个服务之间建立通信时，我无法从一个服务获取响应到其他服务。我的代码如下。

任何人都可以告诉我代码中的错误，因为每次我的代码都会进入后备方法。

1.EmployeeApplication

package io.employee.breaker;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


@RestController
@SpringBootApplication
public class EmployeeApplication {
    private static final Logger log = LoggerFactory.getLogger(EmployeeApplication.class);
    @RequestMapping("/getEmployee")
    public Employee getEmployee() {
        log.info("Inside EmployeeApplication");
        Employee emp = new Employee(1,"Ankit");
        log.info("Return value");
        return emp;
    }

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

2.ReadEmployeeApplication

 package io.employee.breaker;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@EnableCircuitBreaker
@RestController
@SpringBootApplication
@RequestMapping("/employee")
public class ReadEmployeeApplication {
    private static final Logger log = LoggerFactory.getLogger(ReadEmployeeApplication.class);
    public static void main(String[] args) {
        SpringApplication.run(ReadEmployeeApplication.class, args);
    }

    @Autowired
    private EmployeeService employeeService;

    @RequestMapping("/to-read")
    public Employee toRead() {
        log.info("Inside to read");
        return employeeService.readingList();
    }
}

员工服务

package io.employee.breaker;

import java.net.URI;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;

@ComponentScan(basePackages="io.employee.configuration")
@Service
public class EmployeeService {
    private static final Logger log = LoggerFactory.getLogger(EmployeeService.class);
    @Autowired
    private RestTemplate restTemplate;

    @HystrixCommand(fallbackMethod="reliable")
    public Employee readingList() {
        log.info("Inside readingList");
        URI uri = URI.create("http://localhost:4040/getEmployee");
        log.info("restTemplate | "+restTemplate);
        ResponseEntity<Employee> e = restTemplate.getForEntity(uri, Employee.class);
        log.info("Employee | "+e.getBody().toString());
        return e.getBody();
    }

    public Employee reliable() {
        log.info("Inside reliable");
        return new Employee(2,"Jyoti");
    }
}

配置

package io.employee.configuration;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.stereotype.Component;
import org.springframework.web.client.RestTemplate;

@Component
public class Configuration {
    private static final Logger log = LoggerFactory.getLogger(Configuration.class);
    @Bean
    public RestTemplate restTemplate() {
        log.info("Creating Object of RestTemplate");
        RestTemplate restTemplate = new RestTemplate();
        return restTemplate;
    }
}

日志

2018-05-14 16:00:41.507  INFO 4884 --- [nio-4041-exec-1] i.e.breaker.ReadEmployeeApplication      : Inside to read
2018-05-14 16:00:41.980  INFO 4884 --- [ployeeService-1] io.employee.breaker.EmployeeService      : Inside readingList
2018-05-14 16:00:41.980  INFO 4884 --- [ployeeService-1] io.employee.breaker.EmployeeService      : restTemplate | org.springframework.web.client.RestTemplate@484300c9
2018-05-14 16:00:42.091  INFO 4884 --- [ployeeService-1] io.employee.breaker.EmployeeService      : Inside reliable

URI

http://localhost:4041/employee/to-read
http://localhost:4040/getEmployee

的pom.xml

读雇员/ pom.xml的

<?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.ankit</groupId>
    <artifactId>read-employee</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>read-employee</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.0.BUILD-SNAPSHOT</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
        <spring-cloud.version>Finchley.BUILD-SNAPSHOT</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-hystrix</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>

    <repositories>
        <repository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
     </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </pluginRepository>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>


</project>

雇员/ pom.xml的

<?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.ankit</groupId>
    <artifactId>employee</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

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

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.0.BUILD-SNAPSHOT</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

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

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

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

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

    <repositories>
        <repository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </repository>
        <repository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>spring-snapshots</id>
            <name>Spring Snapshots</name>
            <url>https://repo.spring.io/snapshot</url>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </pluginRepository>
       <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
       </pluginRepository>
    </pluginRepositories>


</project>