微服务学习笔记五 Spring Cloud 服务消费者及服务网关

服务消费者 consumer

创建maven工程，pom.xml

<dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        <version>2.0.2.RELEASE</version>
    </dependency>
</dependencies>

创建配置文件，application.yml

server:
  port: 8020
spring:
  application:
    name: consumer
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/
  instance:
    prefer-ip-address: true

创建启动类

package com.shuang;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class ConsumerApplication {
    public static void main(String[] args) {
        SpringApplication.run(ConsumerApplication.class,args);
    }
    @Bean
public RestTemplate restTemplate(){
    return new RestTemplate();
}
}

Handler

package com.shuang.controller;

import com.shuang.entity.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.RestTemplate;

import java.util.Collection;

@RestController
@RequestMapping("/consumer")
public class ConsumerHandler {
    @Autowired
    private RestTemplate restTemplate;

    @GetMapping("/findAll")
    public Collection<Student> findAll(){
        return restTemplate.getForEntity("http://localhost:8010/student/findAll",Collection.class).getBody();
    }
    @GetMapping("/findAll2")
    public Collection<Student> findAll2(){
        return restTemplate.getForObject("http://localhost:8010/student/findAll",Collection.class);
    }

    @GetMapping("/findById/{id}")
    public Student findById(@PathVariable("id") long id){
        return restTemplate.getForEntity("http://localhost:8010/student/findById/{id}",Student.class,id).getBody();
    }

    @GetMapping("/findById2/{id}")
    public Student findById2(@PathVariable("id") long id){
        return restTemplate.getForObject("http://localhost:8010/student/findById/{id}",Student.class,id);
    }

    @PostMapping("save")
    public void save(@RequestBody Student student){
        restTemplate.postForEntity("http://localhost:8010/student/save",student,null).getBody();
    }
    @PostMapping("/save2")
    public void save2(@RequestBody Student student){
        restTemplate.postForObject("http://localhost:8010/student/save",student,null);

    }

    @PutMapping("/update")
    public void update(@RequestBody Student student){
        restTemplate.put("http://localhost:8010/student/update",student);
    }

    @DeleteMapping("/deleteById/{id}")
    public void deleteById(@PathVariable("id") long id){
        restTemplate.delete("http://localhost:8010/student/deleteById/{id}",id);
    }

}

服务网关：

Spring Cloud 集成了 Zuul组件，实现服务网关
Zuul是Netflix提供的一个开源的API网关服务器，是客户端和网站后端所有请求
的中间层，对外开放一个API，将所有请求导入统一的入口，屏蔽了服务端的具体
实现逻辑，Zuul可以实现反向代理的功能，在网关内部实现动态路由、身份认证、
IP过滤、数据监控等。
创建Maven工程，pom.xml

<dependencies>
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        <version>2.0.2.RELEASE</version>
    </dependency>

    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-zuul</artifactId>
        <version>2.0.2.RELEASE</version>
    </dependency>
</dependencies>

创建配置文件。application.yml

server:
  port: 8030
spring:
  application:
    name: gateway
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/
zuul:
  routes:
    provider: /p/**

属性说明：
zuul.routers.provider：给服务提供者provider设置映射

创建启动类

package com.shuang;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.cloud.netflix.zuul.EnableZuulProxy;

@EnableZuulProxy
@EnableAutoConfiguration
public class ZuulApplication {
    public static void main(String[] args) {
        SpringApplication.run(ZuulApplication.class,args);
    }
}

注解说明：
EnableZuulProxy：包含了EnableZuulServer，设置该类是网关的启动类。
EnableAutoConfiguretion：可以帮助Spring Boot应用将所有符合条件的
Configuration配置加载到当前Spring Boot创建并使用的IOC容器中。

Zuul自带了负载均衡功能，修改provider的代码

package com.shuang.controller;


import com.shuang.entity.Student;
import com.shuang.repository.StudentRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;

import java.util.Collection;

@RestController
@RequestMapping("/student")
public class StudentHandler {
    @Autowired
    private StudentRepository studentRepository;

    @Value("${server.port}")
    private String port;

    @GetMapping("/findAll")
    public Collection<Student> findAll(){
        return studentRepository.findAll();
    }
    @GetMapping("/findById/{id}")
    public Student findById(@PathVariable("id") long id){
        return studentRepository.findById(id);
    }
    @PostMapping("/save")
    public void save(@RequestBody Student student){
        studentRepository.saveOrUpdate(student);
    }
    @PutMapping("/update")
    public void update(@RequestBody Student student){
        studentRepository.saveOrUpdate(student);
    }
    @DeleteMapping("/deleteById/{id}")
    public void deleteById(@PathVariable("id") long id){
        studentRepository.deleteById(id);
    }

    @GetMapping("/index")
    public String index(){
        return "当前的端口: "+this.port;
    }
}

启动eurekaclient的启动类。修改端口，增加另外一个启动类，启动（相当于两个相同服务提供者）
在Zuul中访问：两个服务提供者轮流提供服务