microserver-provider-user:

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">
    <parent>
        <artifactId>spring-cloud-micro</artifactId>
        <groupId>com.wenbronk</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>microserver-provider-user</artifactId>

    <dependencies>
        <!--springboot 熱部署-->
        <!--<dependency>-->
            <!--<groupId>org.springframework.boot</groupId>-->
            <!--<artifactId>spring-boot-devtools</artifactId>-->
            <!--<optional>true</optional>-->
            <!--<scope>true</scope>-->
        <!--</dependency>-->

        <!-- exclude掉spring-boot的默認log配置 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- spring-boot的web啟動的jar包 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- 引入log4j2依賴 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-log4j2</artifactId>
        </dependency>
        <!-- 加上這個才能辨認到log4j2.yml文件 -->
        <dependency>  <!-- 加上這個才能辨認到log4j2.yml文件 -->
            <groupId>com.fasterxml.jackson.dataformat</groupId>
            <artifactId>jackson-dataformat-yaml</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>

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

        <!-- 添加springboot 的健康模塊 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

    </dependencies>

    <!--<build>-->
        <!--<plugins>-->
            <!--<plugin>-->
                <!--<groupId>org.springframework.boot</groupId>-->
                <!--<artifactId>spring-boot-maven-plugin</artifactId>-->
                <!--<configuration>-->
                    <!--&lt;!&ndash; 如果沒有這個, 不生效 &ndash;&gt;-->
                    <!--<fork>true</fork>-->
                <!--</configuration>-->
            <!--</plugin>-->
        <!--</plugins>-->
    <!--</build>-->

</project>

2, mianClass

package com.wenbronk.provider.user;

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

/**
 * Created by root on 2017/5/17.
 */
@SpringBootApplication
//@EnableEurekaClient     // 只對eureka 可用
@EnableDiscoveryClient  // 可用zk, eureka等
public class UserApplication {
    public static void main(String[] args) {
        SpringApplication.run(UserApplication.class, args);
    }
}

　　添加@EnableDiscoveryClient, 既可以聲明為eureka的客戶端, 然后通過配置文件注冊服務

application.yml

server:
  port: 7902
spring:
  # 設置eureka中注冊的名稱, 全小寫, 否則大小寫混雜出現問題
  application:
    name: microservice-provider-user
  jpa:
    generate-ddl: false
    show-sql: true
    hibernate:
      ddl-auto: none
  datasource:
    platform: h2
    schema: classpath:schema.sql
    data: classpath:data.sql
logging:
  level:
    root: INFO
    org.hibernate: INFO
    org.hibernate.type.descriptor.sql.BasicBinder: TRACE
    org.hibernate.type.descriptor.sql.BasicExtractor: TRACE
    com.itmuch: DEBUG
eureka:
  client:
    serviceUrl:
      defaultZone: http://wenbronk:abc@localhost:8761/eureka
    healthcheck:
          enabled: true

  # 添加注冊中心中的ip代替主機名
  instance:
    prefer-ip-address: true
    instance-id: ${spring.application.name}:${spring.cloud.client.ipAddress}:${spring.application.instance_id:${server.port}}
    statusPageUrlPath: ${management.context-path}/info
    healthCheckUrlPath: ${management.context-path}/health

data.sql

insert into user(id,username, name, age, balance) values(1,'user1', '張三', 20, 100.00);
insert into user(id,username, name, age, balance) values(2,'user2', '李四', 20, 100.00);
insert into user(id,username, name, age, balance) values(3,'user3', '王五', 20, 100.00);
insert into user(id,username, name, age, balance) values(4,'user4', '馬六', 20, 100.00);

schema.sql

drop table user if exists;
create table user(
    id bigint generated by default as identity,
    username varchar(40),
    name varchar(20),
    age int(3),
    balance decimal(10,2), 
    primary key(id)
);

然后業務代碼:

Repository.java, 此工程使用的是springboot的內嵌數據庫

package com.wenbronk.provider.user.repository;

import com.wenbronk.provider.user.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface UserRepository extends JpaRepository<User, Long> {

}

User.java

package com.wenbronk.provider.user.entity;

import javax.persistence.*;
import java.math.BigDecimal;

@Entity
public class User {

  public User(Long id, String username) {
    super();
    this.id = id;
    this.username = username;
  }

  public User() {
    super();
  }

  @Id
  @GeneratedValue(strategy = GenerationType.AUTO)
  private Long id;

  @Column
  private String username;

  @Column
  private String name;

  @Column
  private Short age;

  @Column
  private BigDecimal balance;

  public Long getId() {
    return this.id;
  }

  public void setId(Long id) {
    this.id = id;
  }

  public String getUsername() {
    return this.username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public String getName() {
    return this.name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public Short getAge() {
    return this.age;
  }

  public void setAge(Short age) {
    this.age = age;
  }

  public BigDecimal getBalance() {
    return this.balance;
  }

  public void setBalance(BigDecimal balance) {
    this.balance = balance;
  }
}

userController.java

package com.wenbronk.provider.user.controller;

import com.google.common.collect.Lists;
import com.netflix.appinfo.InstanceInfo;
import com.netflix.discovery.EurekaClient;
import com.wenbronk.provider.user.entity.User;
import com.wenbronk.provider.user.repository.UserRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.*;

import java.util.ArrayList;
import java.util.List;

@RestController
public class UserController {

    @Autowired
    private UserRepository userRepository;

    @Autowired
    private EurekaClient eurekaClient;

    /**
     * 為Netflix不具體的發現客戶端提供簡單的API
     */
    @Autowired
    private DiscoveryClient discoveryClient;

    @GetMapping("/simple/{id}")
    public User findById(@PathVariable Long id) {
        return this.userRepository.findOne(id);
    }

    /**
     * 發現其他服務, 返回一個url:port
     * @return
     */
    @GetMapping("/eureka-instance")
    public String serviceUrl() {
        InstanceInfo eureka = this.eurekaClient.getNextServerFromEureka("microservice-provider-user", false);
        return eureka.getHomePageUrl();
    }

    @GetMapping("/instance-info")
    public ServiceInstance showInfo() {
        ServiceInstance localServiceInstance = this.discoveryClient.getLocalServiceInstance();
        return localServiceInstance;
    }

    @PostMapping("/user")
    public User postUser(@RequestBody User user) {
        return user;
    }

    // 該請求不會成功
    @GetMapping("/get-user")
    public User getUser(User user) {
        return user;
    }

    @GetMapping("list-all")
    public List<User> listAll() {
        ArrayList<User> list = Lists.newArrayList();
        User user = new User(1L, "zhangsan");
        User user2 = new User(2L, "zhangsan");
        User user3 = new User(3L, "zhangsan");
        list.add(user);
        list.add(user2);
        list.add(user3);
        return list;

    }
}

microserver-consumer-user

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">
    <parent>
        <artifactId>spring-cloud-micro</artifactId>
        <groupId>com.wenbronk</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>microserver-consumer-movie</artifactId>

    <dependencies>
        <!--springboot 熱部署-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <optional>true</optional>
            <scope>true</scope>
        </dependency>

        <!-- exclude掉spring-boot的默認log配置 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-logging</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <!-- spring-boot的web啟動的jar包 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- 引入log4j2依賴 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-log4j2</artifactId>
        </dependency>
        <!-- 加上這個才能辨認到log4j2.yml文件 -->
        <dependency>  <!-- 加上這個才能辨認到log4j2.yml文件 -->
            <groupId>com.fasterxml.jackson.dataformat</groupId>
            <artifactId>jackson-dataformat-yaml</artifactId>
        </dependency>

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

        <!-- 添加springboot 的健康模塊 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <!-- 如果沒有這個, 不生效 -->
                    <fork>true</fork>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

application.yml

server:
  port: 7901
spring:
  # 設置eureka中注冊的名稱, 全小寫, 否則大小寫混雜出現問題
  application:
    name: microservice-consumer-movie

logging:
  level:
    root: INFO
    org.hibernate: INFO
    org.hibernate.type.descriptor.sql.BasicBinder: TRACE
    org.hibernate.type.descriptor.sql.BasicExtractor: TRACE
    com.itmuch: DEBUG
eureka:
  client:
    serviceUrl:
      defaultZone: http://wenbronk:abc@localhost:8761/eureka

  # 添加注冊中心中的ip代替主機名
  instance:
    prefer-ip-c: true
    instance-id: ${spring.application.name}:${spring.cloud.client.ipAddress}:${spring.application.instance_id:${server.port}}
    statusPageUrlPath: ${management.context-path}/info
    healthCheckUrlPath: ${management.context-path}/health

mainClass.java

package com.wenbronk.consumer.movie;

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;

/**
 * 啟動類
 * Created by root on 2017/5/18.
 */
@SpringBootApplication
@EnableEurekaClient
public class MovieApplication {

    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

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

user.java

package com.wenbronk.consumer.movie.entity;

import java.math.BigDecimal;

public class User {
  private Long id;

  private String username;

  private String name;

  private Short age;

  private BigDecimal balance;

  public Long getId() {
    return this.id;
  }

  public void setId(Long id) {
    this.id = id;
  }

  public String getUsername() {
    return this.username;
  }

  public void setUsername(String username) {
    this.username = username;
  }

  public String getName() {
    return this.name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public Short getAge() {
    return this.age;
  }

  public void setAge(Short age) {
    this.age = age;
  }

  public BigDecimal getBalance() {
    return this.balance;
  }

  public void setBalance(BigDecimal balance) {
    this.balance = balance;
  }

}

movieController.java

package com.wenbronk.consumer.movie.controller;

import com.wenbronk.consumer.movie.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

/**
 * Created by root on 2017/5/18.
 */
@RestController
public class MovieController {

    @Autowired
    private RestTemplate restTemplate;

    @RequestMapping("/movie/{id}")
    public User findById(@PathVariable Long id) {
        return restTemplate.getForObject("http://localhost:7900/simple/" + id, User.class);
    }

}

服務開啟順序為: eureka, user, movie, 之后通過瀏覽器就可以調用movie中的服務, 在console中可看到movie正確調用了user中的服務

使用restTemplate遇到的坑:

如果接受的對象是list, 需要使用數組接受 (User[]) , 不可直接用list, 否則報錯

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