第一篇： SpringBoot創建服務，消費服務（使用RestTemplate調用）

一.首先創建一個user(消費)工程

目的：該工程主要通過jpa查詢數據庫

建表語句：

Create Table

CREATE TABLE `user_test` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT,
  `username` varchar(40) DEFAULT NULL,
  `name` varchar(20) DEFAULT NULL,
  `age` int(3) DEFAULT NULL,
  `balance` decimal(10,2) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf

1.添加依賴

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

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

2.配置文件application.yml

server:
  port: 9090
spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql://localhost/test?characterEncoding=utf8
    username: root
    password: 123456
  jpa:
    properties:
      hibernate:
        show_sql: true
        format_sql: true

3.代碼（此處邏輯較簡單故此沒寫sesrvice層）

JPA類

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

User類

package com.itcast.provider_user.entity；

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

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

@Entity
@Table(name="user_test")
@JsonIgnoreProperties(value={"hibernateLazyInitializer","handler","fieldHandler"})
public class User implements Serializable{
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column
    private Long id;
    @Column
    private String username;
    @Column
    private String name;
    @Column
    private Short age;
    @Column
    private BigDecimal balance;


    public Long getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

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

    public String getName() {
        return name;
    }

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

    public Short getAge() {
        return age;
    }

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

    public BigDecimal getBalance() {
        return balance;
    }

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

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", name='" + name + '\'' +
                ", age=" + age +
                ", balance=" + balance +
                '}';
    }
}

Controller類

@RestController
public class userController {

    @Autowired
    private UserJpa userJpa;

    @GetMapping("/simple/{id}")
    public User findById(@PathVariable Long id){
        return userJpa.getOne(id);
    }


}

二.創建一個movie工程（消費）

1. 添加依賴

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

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

1. 配置文件application.yml

server:
  port: 9091
user:
  userServicePath: http://localhost:9090/simple/

1. 代碼
   User類：

public class User {

    private Long id;

    private String username;

    private String name;

    private Short age;

    private BigDecimal balance;

    public Long getId() {
        return id;
    }

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

    public String getUsername() {
        return username;
    }

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

    public String getName() {
        return name;
    }

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

    public Short getAge() {
        return age;
    }

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

    public BigDecimal getBalance() {
        return balance;
    }

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

Controller類

@RestController
public class MovieController {
    @Autowired
    private RestTemplate restTemplate;

    @Value("${user.userServicePath}")
    private String userServicePath;

    @GetMapping("/movie/{id}")
    public User findById(@PathVariable Long id){
        return restTemplate.getForObject(userServicePath+id,User.class);
    }
}

此處需要註冊一個RestTemplate類

@SpringBootApplication
public class ConxumerMovieApplication {

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

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

此時movie工程可以通過：
http://localhost:9091/movie/1
{“id”:1,”username”:”user1”,”name”:”張三”,”age”:20,”balance”:100.00}

完成服務間的調用。