springCloud--1-LMLPHP

电影微服务是服务消费者,用户微服务是服务提供者。

Springcloud对eureka的支持很好,eureka本身是一个基于REST的服务,

springCloud--1-LMLPHP

springCloud--1-LMLPHP

springCloud--1-LMLPHP

Eureka里面有一个注册表,Application Client是服务消费者,Application Service是服务提供者。Make Remote Call是远程调用,us-east-1c,us-east-1d,us-east-1e是zone,他们都属于us-east-1这个region。他们都是Eureka Client。

服务提供者(Application Service)和服务消费者(Application Client)启动的时候都会像eureka注册(ip和端口),他们更eureka server有一个心跳机制默认30秒,连续3次90秒没有收到心跳就会从注册表移除这个节点。Eureka service集群之间会相互复制服务注册表。

服务提供者的ip和端口变化了,服务注册表会更新ip和端口。

eureka client缓存:即使所有的eureka service都宕机了,服务消费者也会知道服务提供者的ip和端口进行调用。

服务注册表就是一个数据库,用来记录ip和端口,并且提供API操作服务注册表,把服务添加到注册表称之为注册从注册表移除称之为注销。

心跳机制是健康检查机制。

服务发现方式:客户端发现(Eureka,zk),服务端发现(Consul+nginx)。http://blog.daocloud.io/microservices-4/   SpringCloud对Eureka支持最完整。

Eureka:服务发现组件。

springCloud--1-LMLPHP

服务消费者:

package com.itmuch.cloud;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate; //服务消费者
@SpringBootApplication
public class MicroserviceSimpleConsumerMovieApplication { @Bean //实例化了一个对象new RestTemplate,方法的名字rt就是实例化后bean的名字,其他地方通过@Autowired引用
public RestTemplate rt() {
return new RestTemplate();
} public static void main(String[] args) {
SpringApplication.run(MicroserviceSimpleConsumerMovieApplication.class, args);
}
}
package com.itmuch.cloud.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate; import com.itmuch.cloud.entity.User; @RestController
public class MovieController { @Autowired //初始化是启动类上面的@bean注解
private RestTemplate rt;//使用RestTemplate调用 //user: userServicePath: http://localhost:7900/simple/
//从yml文件读值.这里的ip和端口是写死的,有的时候服务提供者的ip和端口是变化的。
//如果有多个提供者,如何做负载(nginx是可以做转发的,nginx通过url转发到不同的微服务),使用eureka(客户端发现机制)。
@Value("${user.userServicePath}")
private String userServicePath; @GetMapping("/movie/{id}")
public User findById(@PathVariable Long id) {
return this.rt.getForObject(this.userServicePath + id, User.class);
}
}
package com.itmuch.cloud.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;
} }
yml:

server:
port: 7901
user:
userServicePath: http://localhost:7900/simple/
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">
<modelVersion>4.0.0</modelVersion> <groupId>com.itmuch.cloud</groupId>
<artifactId>microservice-simple-consumer-movie</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging> <name>microservice-simple-consumer-movie</name>
<description>Demo project for Spring Boot</description> <parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.1.RELEASE</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>
</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>
<dependency>
<groupId>xalan</groupId>
<artifactId>xalan</artifactId>
<version>2.7.2</version>
</dependency>
</dependencies> <build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build> </project>

服务提供者:

package com.itmuch.cloud;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication; //服务提供者
@SpringBootApplication
public class MicroserviceSimpleProviderUserApplication { public static void main(String[] args) {
SpringApplication.run(MicroserviceSimpleProviderUserApplication.class, args);
}
}
package com.itmuch.cloud.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.entity.User;
import com.itmuch.cloud.repository.UserRepository; @RestController//相当于加了@responseBody和@controller
public class UserController { @Autowired
private UserRepository userRepository; @GetMapping("/simple/{id}") //@GetMapping是@requestMapping(method=get)
public User findById(@PathVariable Long id) {
return this.userRepository.findOne(id);
}
}
package com.itmuch.cloud.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 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;
}
}
package com.itmuch.cloud.repository;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository; import com.itmuch.cloud.entity.User; //DAO
@Repository
public interface UserRepository extends JpaRepository<User, Long> { }
yml

server:
port: 7900
spring:
jpa:
generate-ddl: false #启动的时候不打印sql语句
show-sql: true #显示sql语句
hibernate: #依赖hibernate
ddl-auto: none #ddl语句的处理
datasource: #数据源
platform: h2 #h2数据库
schema: classpath:schema.sql #建表语句
data: classpath:data.sql #数据
logging:
level:
root: INFO
org.hibernate: INFO
org.hibernate.type.descriptor.sql.BasicBinder: TRACE #把参数打印出来
org.hibernate.type.descriptor.sql.BasicExtractor: TRACE
com.itmuch: DEBUG

data.sql:

insert into user(id,username, name, age, balance) values(1,'user1', '寮犱笁', 20, 100.00);
insert into user(id,username, name, age, balance) values(2,'user2', '鏉庡洓', 20, 100.00);
insert into user(id,username, name, age, balance) values(3,'user3', '鐜嬩簲', 20, 100.00);
insert into user(id,username, name, age, balance) values(4,'user4', '椹叚', 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)
);
<?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> <name>microservice-simple-provider-user</name>
<description>Demo project for Spring Boot</description> <parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.4.1.RELEASE</version>
<relativePath/>
</parent> <properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties> <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>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-solr</artifactId>
</dependency>
</dependencies> <build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build> </project>
05-13 08:31