SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

时间:2021-10-08 12:27:15
作者:故事我忘了
个人微信公众号:程序猿的月光宝盒
SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

[toc]
## 前提:本篇是基于

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程和CRUD练习[1]

的修改与拓展


1.修改consumerCenterFeign.java,把返回值全部设置为String

/**
* 是consumer调用provider(需要指定provider的名字)
* 请求的清单列表:规定调用地址、参数、返回值
* 在正常走通的时候不走CenterFeignFallBack,当provider down的时候走熔断器,相当于是类的try-catch
*/
@FeignClient(name = "provider",fallback = CenterFeignFallBack.class)
public interface CenterFeign {
@GetMapping("/optionData.do")
public String optionData(); @PostMapping("/showEmpData.do")
//Feign:不支持对象传参,所以要用@RequestBody
public String showEmpData(@RequestBody Emp emp); @PostMapping("/add.do")
public String add(@RequestBody Emp emp); @PostMapping("/edit.do")
public String edit(@RequestBody Emp emp); @GetMapping("/del.do")
public String del(@RequestParam("empno") Integer empno);
}

2.在CenterFeign.java的同包下创建实现了CenterFeign接口的CenterFeignFallBack.java作为熔断器

@Component
public class CenterFeignFallBack implements CenterFeign {
@Override
public String optionData() {
return "provider-optionData-error";
} @Override
public String showEmpData(Emp emp) {
return "provider-showEmpData-error";
} @Override
public String add(Emp emp) {
return "provider-add-error";
} @Override
public String edit(Emp emp) {
return "provider-edit-error";
} @Override
public String del(Integer empno) {
return "provider-del-error";
}
}

3.修改consumerCenterController.java,返回值全改为String

@RestController
public class CenterController{
@Resource
private CenterFeign centerFeign; @GetMapping("/optionData-consumer.do")
public String optionData() {
return centerFeign.optionData();
} @PostMapping("/showEmpData-consumer.do")
public String showEmpData(@RequestBody Emp emp) {
return centerFeign.showEmpData(emp);
} @PostMapping("/add-consumer.do")
public String add(@RequestBody Emp emp) {
return centerFeign.add(emp);
} @PostMapping("/edit-consumer.do")
public String edit(@RequestBody Emp emp) {
return centerFeign.edit(emp);
} @GetMapping("/del-consumer.do")
public String del(@RequestParam("empno") Integer empno) {
return centerFeign.del(empno);
}
}

4.确认consumer中的配置文件application.properties中有没有开启熔断feign.hystrix.enabled=true,没有的话加上

#端口号
server.port=8764
#应用名
spring.application.name=consumer
#eureka客户端服务url默认区域
eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/
#开启熔断器
feign.hystrix.enabled=true
#下线名称.ribbon.NF加载平衡规则类名,这里先注释
provider.ribbon.NFLoadBalancerRuleClassName=com.netflix.loadbalancer.RandomRule

5.开启服务测试

访问http://localhost:8761/

发现所有服务已经注册

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

正常走provider没有问题

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]


SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

走consumer也没有问题,只是返回的格式是字符串类型,不是json类型,但是没关系,格式还是json的格式,前台该怎么转还能怎么转,不影响

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

那怎么走容错?

现在手动停止一个provider

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

因为这里我开了负载均衡策略(在consumer中的配置文件中provider.ribbon.NFLoadBalancerRuleClassName=com.netflix.loadbalancer.RandomRule),所以有一定几率触发熔断器,

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

这就相当于类之间的try-catch,没有熔断器的话这里百分百是报错误代码.那这里我先把负载均衡关掉,在测试有没有走容错,(猜一下,会走吗?)

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

这里我测了这么多次,都没有走熔断,所以显然不走,为何?

因为没有手动设置负载均衡策略的话,默认走的是轮询.机制,啥是Ribbon轮询机制?

简单的说就是有abc三台服务器,正常的情况下走a->b->c,在有一台down了的时候,那台就自动跳过,比如b down了,那么就是a->c

以上,个人理解,若有误请指正,よろしくお願いします~


现在,既然一台服务器工作是没有问题 那我两台provider全部停止呢?

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

那答案是肯定的,绝壁走容错~~

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

6.测试完没有问题,现在添加网关功能模块

新建模块(Spring initializr)zuul-client

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

7.编辑配置文件application.properties

#网关端口
server.port=8765
#应用名
spring.application.name=zuul
#网关路径提供者,后面的**表示:xxx.do
zuul.routes.provider=/pro/**/
#网关路径消费者,后面的**表示:xxx.do
zuul.routes.consumer=/con/**/
#网关走熔断机制
#ribbon超时设置
ribbon.ReadTimeout=30000
ribbon.ConnectTimeout=30000

8.在启动类上添加注解

//开启网关代理
@EnableZuulProxy
//开启eureka客户端
@EnableEurekaClient
@SpringBootApplication
public class ZuulClientApplication { public static void main(String[] args) {
SpringApplication.run(ZuulClientApplication.class, args);
} }

9.开启服务测试

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]


测试provider

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

测试consumer

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

10.网关作用

统一了所有客户端的ip地址和端口号,我们只要给不同层级的应用起别名就ok了(就是这里的SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2])

11.加入Redis缓存

11.1在provider-one模块的pom文件中加入redis依赖

 <dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

11.2修改provider-one模块的DeptServiceImpl文件,加入 @Autowired private RedisTemplate redisTemplate;

@Service
public class DeptServiceImpl implements DeptService {
@Autowired
private DeptMapper deptMapper;
@Autowired
private RedisTemplate redisTemplate; @Override
public Map<String, Object> optionData() {
Map<String, Object> map=new HashMap<>();
List<Map<String, Object>> list = deptMapper.selAllDeptData();
// 定义Redis存储集合的对象
ListOperations<String,Map<String,Object>> redisList = redisTemplate.opsForList();
//拼接Redis中存储数据对应的key
String key = "depts";
//判断Redis中是否有key,没有就说明是第一次访问,将数据放入Redis
if(!redisTemplate.hasKey(key)){
//直接将数据库查询出来的值放入Redis
System.out.println("provider-one-optionData的值已经放入Redis");
redisList.leftPushAll(key,list);
}
map.put("data",list);
return map;
}
}

11.3对应的 修改DeptService,返回值变成map

public interface DeptService {
Map<String,Object> optionData();
}

11.4修改CenterController,把返回值类型改为Map

    public Map<String, Object> optionData() {
return deptService.optionData();
}

11.5同样的在provider-two的pom.xml中加入redis依赖

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

11.6修改provider-two模块的DeptServiceImpl文件,加入 @Autowired private RedisTemplate redisTemplate;

@Service
public class DeptServiceImpl implements DeptService {
@Autowired
private DeptMapper deptMapper;
@Autowired
private RedisTemplate redisTemplate; @Override
public Map<String, Object> optionData() {
Map<String, Object> map=new HashMap<>();
List<Map<String, Object>> list = deptMapper.selAllDeptData();
// 定义Redis存储集合的对象
ListOperations<String,Map<String,Object>> redisList = redisTemplate.opsForList();
//拼接Redis中存储数据对应的key
String key = "depts";
//判断Redis中是否有key,没有就说明是第一次访问,将数据放入Redis
if(!redisTemplate.hasKey(key)){
//直接将数据库查询出来的值放入Redis
System.out.println("provider-two-optionData的值已经放入Redis");
redisList.leftPushAll(key,list);
}
map.put("data",list);
return map;
}
}

11.7对应的 修改DeptService,返回值变成map

public interface DeptService {
Map<String,Object> optionData();
}

11.8修改CenterController,把返回值类型改为Map

    public Map<String, Object> optionData() {
return deptService.optionData();
}

11.9更新provider-one模块的配置文件application.properties,加入Redis配置

#服务端口号
server.port=8762
#应用名
spring.application.name=provider
#eureka客户端服务url默认区域
eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/ #数据源驱动类名
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
#数据源url
spring.datasource.url=jdbc:mysql:///kh75
#数据源用户名
spring.datasource.username=root
#数据源密码
spring.datasource.password=admin #后期会写mapper.xml,这里先注释
#mybatis.mapper-locations=classpath:mapper/*.xml #给实体类起别名,同样这里先注释
#mybatis.type-aliases-package=cn.kgc.vo #配置Redis
spring.redis.port=6379
#redis所在的主机地址
spring.redis.host=xxx.xxx.xxx
spring.redis.database=0

11.10更新provider-two模块的配置文件application.properties,加入Redis配置

#服务端口号
server.port=8763
#应用名
spring.application.name=provider
#eureka客户端服务url默认区域
eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/ #数据源驱动类名
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
#数据源url
spring.datasource.url=jdbc:mysql:///kh75
#数据源用户名
spring.datasource.username=root
#数据源密码
spring.datasource.password=admin #后期会写mapper.xml,这里先注释
#mybatis.mapper-locations=classpath:mapper/*.xml #给实体类起别名,同样这里先注释
#mybatis.type-aliases-package=cn.kgc.vo
#配置Redis
spring.redis.port=6379
#redis所在的主机地址
spring.redis.host=xxx.xxx.xx
spring.redis.database=0

11.11更新consumer的CenterFeign,所有返回值都是map

@FeignClient(name = "provider",fallback = CenterFeignFallBack.class)
public interface CenterFeign {
@GetMapping("/optionData.do")
Map<String,Object> optionData(); @PostMapping("/showEmpData.do")
//Feign:不支持对象传参,所以要用@RequestBody
Map<String,Object> showEmpData(@RequestBody Emp emp); @PostMapping("/add.do")
Map<String,Object> add(@RequestBody Emp emp); @PostMapping("/edit.do")
Map<String,Object> edit(@RequestBody Emp emp); @GetMapping("/del.do")
Map<String,Object> del(@RequestParam("empno") Integer empno);
}

11.12更新CenterFeignFallBack

@Component
public class CenterFeignFallBack implements CenterFeign {
private Map<String, Object> map = new HashMap<> ();
@Autowired
private RedisTemplate redisTemplate;
@Override
public Map<String,Object> optionData() {
ListOperations<String,Map<String,Object>> redisList = redisTemplate.opsForList();
map.put("msg","provider-optionData-error");
map.put("feign-data",redisList.range("depts",0,-1));
return map;
} @Override
public Map<String,Object> showEmpData(Emp emp) {
ListOperations<String,Map<String,Object>> redisList = redisTemplate.opsForList();
map.put("msg","provider-showEmpData-error");
//这里对应的serviceImp里面还没修改成Redis,先放着
map.put("feign-data",redisList.range("emps",0,-1));
return map;
} @Override
public Map<String,Object> add(Emp emp) {
map.put("msg","provider-add-error");
return map;
} @Override
public Map<String,Object> edit(Emp emp) {
map.put("msg","provider-edit-error");
return map;
} @Override
public Map<String,Object> del(Integer empno) {
map.put("msg","provider-del-error");
return map;
}
}

11.13再修改consumer中的CenterController,返回值也全改成Map

@RestController
public class CenterController{
@Resource
private CenterFeign centerFeign; @GetMapping("/optionData-consumer.do")
public Map<String,Object> optionData() {
return centerFeign.optionData();
} @PostMapping("/showEmpData-consumer.do")
public Map<String,Object> showEmpData(@RequestBody Emp emp) {
return centerFeign.showEmpData(emp);
} @PostMapping("/add-consumer.do")
public Map<String,Object> add(@RequestBody Emp emp) {
return centerFeign.add(emp);
} @PostMapping("/edit-consumer.do")
public Map<String,Object> edit(@RequestBody Emp emp) {
return centerFeign.edit(emp);
} @GetMapping("/del-consumer.do")
public Map<String,Object> del(@RequestParam("empno") Integer empno) {
return centerFeign.del(empno);
}
}

11.14检查consumer的pom文件里是否有加入Redis依赖,没有加上...

11.15 打开所有模块进行测试

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

把提供者断掉,理论上走熔断和redis数据

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

SpringCloud+Eureka+Feign+Ribbon的简化搭建流程,加入熔断,网关和Redis缓存[2]

以上....