Spring cloud实战——服务提供者

提示：扫一扫查出行
【扫一扫了解最新限行尾号】
复制提示

目录讲解：

一、服务提供者与服务消费者的概念

二、编写一个服务提供者的测试类（code）

1.1、使用微服务构建的是分布式系统，微服务之间通过网络进行通信。我们使用微服务提供者与服务消费者来描述微服务之间的调用关系。

如下：

在生活中就有这样的例子，在我们看电影的时候，用户发起一个购票的请求。在进行购票的业务操作前，电影微服务需要调用用户微服务的接口，

查询当前用户的余额是多少，是不是符合购票标准等等。在这种场景下，用户微服务就是一个服务提供者，电影微服务则是一个服务消费者。

2.2 编写一个服务提供者

框架结构如下：

步骤：

2.1 创建一个maven项目，架构如上，pom.xml的内容如下：

<?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.itmuch.cloud</groupId>
<artifactId>microservice-simple-provider-user</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging> 
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.3.RELEASE</version>
</parent> <properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<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-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
</dependencies> 
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Camden.SR4</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>

2.2 准备好建表语句

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));

2.2 准备好几条语句

insert into user (id, username, name, age, balance) values (1, 'account1', '张三', 20, 100.00);
insert into user (id, username, name, age, balance) values (2, 'account2', '李四', 28, 180.00);
insert into user (id, username, name, age, balance) values (3, 'account3', '王五', 32, 280.00);

2.3 准备实体类

package com.itmuch.cloud.study.entity;import java.math.BigDecimal;import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;@Entity
public class User {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@Column
private String username;
@Column
private String name;
@Column
private Integer 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 Integer getAge() {
return this.age;
} public void setAge(Integer age) {
this.age = age;
} public BigDecimal getBalance() {
return this.balance;
} public void setBalance(BigDecimal balance) {
this.balance = balance;
}}

2.3 编写Dao类

2.3 编写controller类

package com.itmuch.cloud.study.controller;import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;import com.itmuch.cloud.study.entity.User;
import com.itmuch.cloud.study.repository.UserRepository;@RestController
public class UserController {
@Autowired
private UserRepository userRepository; @GetMapping("/{id}")
public User findById(@PathVariable Long id) {
User findOne = this.userRepository.findOne(id);
return findOne;
}
}

2.4 编写启动类

package com.itmuch.cloud.study;import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class ProviderUserApplication {
public static void main(String[] args) {
SpringApplication.run(ProviderUserApplication.class, args);
}
}

2.5 编写配置文件

server:
port: 8000
spring:
jpa:
generate-ddl: false
show-sql: true
hibernate:
ddl-auto: none
datasource: # 指定数据源
platform: h2 # 指定数据源类型
schema: classpath:schema.sql # 指定h2数据库的建表脚本
data: classpath:data.sql # 指定h2数据库的数据脚本
logging: # 配置日志级别，让hibernate打印出执行的SQL
level:
root: INFO
org.hibernate: INFO
org.hibernate.type.descriptor.sql.BasicBinder: TRACE
org.hibernate.type.descriptor.sql.BasicExtractor: TRACE## INFO
info:
app:
name: @project.artifactId@
encoding: @project.build.sourceEncoding@
java:
source: @java.version@
target: @java.version@