Spring cloud實戰微服——服務提供者
阿新 • • 發佈：2018-01-17
turn nbsp private config amd .class res 請求 sim
目錄講解：
一、服務提供者與服務消費者的概念
二、編寫一個服務提供者的測試類（code）
1.1、 使用微服務構建的是分布式系統，微服務之間通過網絡進行通信。我們使用微服務提供者與服務消費者來描述微服務之間的調用關系。
如下：
在生活中就有這樣的例子，在我們看電影的時候，用戶發起一個購票的請求。在進行購票的業務操作前，電影微服務需要調用用戶微服務的接口，
查詢當前用戶的余額是多少，是不是符合購票標準等等。在這種場景下，用戶微服務就是一個服務提供者，電影微服務則是一個服務消費者。
2.2 編寫一個服務提供者
框架結構如下：
步驟：
2.1 創建一個maven項目，架構如上，pom.xml的內容如下：
<?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> <!-- 引入spring boot的依賴 --> <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> <!-- 引入spring cloud的依賴 --> <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> <!-- 添加spring-boot的maven插件 --> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
2.2 準備好建表語句
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 準備好幾條語句
insert into user (id, username, name, age, balance) values (1, ‘account1‘, ‘張三‘, 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 準備實體類
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 編寫Dao類
2.3 編寫controller類
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 編寫啟動類
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 編寫配置文件
server:
port: 8000
spring:
jpa:
generate-ddl: false
show-sql: true
hibernate:
ddl-auto: none
datasource: # 指定數據源
platform: h2 # 指定數據源類型
schema: classpath:schema.sql # 指定h2數據庫的建表腳本
data: classpath:data.sql # 指定h2數據庫的數據腳本
logging: # 配置日誌級別，讓hibernate打印出執行的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@
最後在瀏覽器裏面輸入：localhost:8000/1 看見了用戶信息，則成功了
後續再為大家總結，有寫的不周到的地方，歡迎大家提出來
Spring cloud實戰微服——服務提供者