取名爲eureka-server
,並添加以下Dependencies:java
application.properties
#配置端口 server.port=8761 #spring 的應用名=通常是模塊名 spring.application.name=eureka-server #當前模塊是否註冊爲eureka的客戶端 # --->由於當前應用應該是服務端 # --->因此選false eureka.client.register-with-eureka=false #既然不是客戶端,那麼是否 # 在Server Center 註冊? # --->不要,由於當前應用原本就是server eureka.client.fetch-registry=false #------------------------------------------ #eureka.客戶端.服務url.默認區域,${server.port} 動態獲取port-->即第1行的8761 eureka.client.serviceUrl.defaultZone=http://localhost:${server.port}/eureka
@EnableEurekaServer
//啓用Eureka服務器 @EnableEurekaServer @SpringBootApplication public class EurekaServerApplication { public static void main(String[] args) { SpringApplication.run(EurekaServerApplication.class, args); } }
本機訪問http://localhost:8761/
mysql
有畫面則說明啓動成功spring
<dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>4.12</version> </dependency> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.10</version> </dependency> </dependencies>
@Data @AllArgsConstructor @NoArgsConstructor public class Dept implements Serializable { private Integer deptno; private String dname; private String loc; }
@Data @AllArgsConstructor @NoArgsConstructor public class Emp implements Serializable { private Integer empno; private String ename; private String job; private Integer mgr; private java.sql.Date hiredate; private Double sal; private Double comm; private Integer deptno; }
clean
而後再install
打包到本地倉庫如上圖,有就好了...sql
Spring Initializr
工程<dependency> <groupId>cn.kgc</groupId> <artifactId>employee-common</artifactId> <version>1.0-SNAPSHOT</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <!--修改版本號--> <version>5.1.38</version> </dependency>
DeptMapper.java
數據庫
@Mapper public interface DeptMapper { @Select("select * from dept") List<Map<String,Object>>selAllDeptData(); }
DeptService.java
服務器
public interface DeptService { List<Map<String,Object>> optionData(); }
DeptServiceImpl.java
微信
@Service public class DeptServiceImpl implements DeptService { @Autowired private DeptMapper deptMapper; @Override public List<Map<String, Object>> optionData() { return deptMapper.selAllDeptData(); } }
CenterController.java
mybatis
@RestController public class CenterController { @Autowired private DeptService deptService; @GetMapping("/optionData.do") public List<Map<String, Object>> optionData() { return deptService.optionData(); } }
application.properties
併發
#服務端口號 server.port=8762 #應用名 spring.application.name=provider #eureka客戶端服務url默認區域 eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/ #數據源驅動類名 spring.datasource.driver-class-name=com.mysql.jdbc.Driver #數據源url,www.52cc.monster爲個人服務器,可是可能在國外,time out 噁心死我了 仍是用回localhost或者國內阿里的 spring.datasource.url=jdbc:mysql://www.52cc.monster:3306/kh75 #數據源用戶名 spring.datasource.username=root #數據源密碼 spring.datasource.password=**** #後期會寫mapper.xml,這裏先註釋 #mybatis.mapper-locations=classpath:mapper/*.xml #給實體類起別名,一樣這裏先註釋 #mybatis.type-aliases-package=cn.kgc.vo
ProviderOneApplication.java
app
//啓用eureka客戶端 @EnableEurekaClient //Mapper掃描,對應的mapper包 @MapperScan("cn.kgc.mapper") @SpringBootApplication public class ProviderOneApplication { public static void main(String[] args) { SpringApplication.run(ProviderOneApplication.class, args); } }
Spring Initializr
工程<dependency> <groupId>cn.kgc</groupId> <artifactId>employee-common</artifactId> <version>1.0-SNAPSHOT</version> </dependency>
CenterFeign.java
/** * 是consumer調用provider(須要指定provider的名字) * 請求的清單列表:規定調用地址、參數、返回值 */ @FeignClient(name = "provider") public interface CenterFeign { @GetMapping("/optionData.do") public List<Map<String, Object>> optionData(); }
CenterController
CenterController.java
@RestController public class CenterController { @Autowired private CenterFeign centerFeign; @GetMapping("/optionData-consumer.do") public List<Map<String, Object>> optionData() { return centerFeign.optionData(); } }
application.properties
#端口號 server.port=8764 #應用名 spring.application.name=consumer #eureka客戶端服務url默認區域 eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/ #下線名稱.ribbon.NF加載平衡規則類名,這裏先註釋 #provider.ribbon.NFLoadBalancerRuleClassName=com.netflix.loadbalancer.RandomRule
ConsumerApplication.java
//開啓Feign客戶端 @EnableFeignClients //開啓eureka客戶端 @EnableEurekaClient @SpringBootApplication public class ConsumerApplication { public static void main(String[] args) { SpringApplication.run(ConsumerApplication.class, args); } }
已查出數據....
EmpMapper.java
public interface EmpMapper { @Select( "<script>" + " select d.dname,d.loc,e.* from emp e,dept d WHERE e.deptno=d.deptno" + " <if test='deptno!=-1 and deptno!=null'>" + " and e.deptno=#{deptno}" + " </if>" + " <if test='empno!=null'>" + " and e.empno=#{empno}" + " </if>" + "</script>" ) List<Map<String,Object>> selEmpData(Emp emp); @Insert("insert into emp(empno,ename,sal,job,deptno) values(#{empno},#{ename},#{sal},#{job},#{deptno})") Integer insert(Emp emp); @Update("update emp set ename=#{ename},sal=#{sal},job=#{job},deptno=#{deptno} where empno=#{empno}") Integer updEmp(Emp emp); @Delete("delete from emp where empno=#{empno}") Integer delEmpByPrimaryKey(Integer empno); }
EmpService.java
public interface EmpService { List<Map<String,Object>> showEmpData(Emp emp); Integer add(Emp emp); Integer edit(Emp emp); Integer del(Integer empno); }
EmpServiceImpl.java
@Service @Transactional public class EmpServiceImpl implements EmpService { @Autowired private EmpMapper empMapper; @Override public List<Map<String, Object>> showEmpData(Emp emp) { return empMapper.selEmpData(emp); } @Override public Integer add(Emp emp) { return empMapper.insert(emp); } @Override public Integer edit(Emp emp) { return empMapper.updEmp(emp); } @Override public Integer del(Integer empno) { return empMapper.delEmpByPrimaryKey(empno); } }
更新中心控制類
CenterController.java
@RestController public class CenterController { @Autowired private DeptService deptService; @Autowired private EmpService empService; @GetMapping("/optionData.do") public List<Map<String, Object>> optionData() { return deptService.optionData(); } @PostMapping("/showEmpData.do") //Feign:不支持對象傳參,因此要用@RequestBody public List<Map<String, Object>> showEmpData(@RequestBody Emp emp) { return empService.showEmpData(emp); } @PostMapping("/add.do") public Integer add(@RequestBody Emp emp) { return empService.add(emp); } @PostMapping("/edit.do") public Integer edit(@RequestBody Emp emp) { return empService.edit(emp); } @GetMapping("/del.do") public Integer del(@RequestParam("empno") Integer empno) { return empService.del(empno); } }
更新feign類
@FeignClient(name = "provider") public interface CenterFeign { @GetMapping("/optionData.do") public List<Map<String, Object>> optionData(); @PostMapping("/showEmpData.do") //Feign:不支持對象傳參,因此要用@RequestBody public List<Map<String, Object>> showEmpData(@RequestBody Emp emp); @PostMapping("/add.do") public Integer add(@RequestBody Emp emp); @PostMapping("/edit.do") public Integer edit(@RequestBody Emp emp); @GetMapping("/del.do") public Integer del(@RequestParam("empno") Integer empno); }
更新consumer的controller
@RestController public class CenterController{ @Autowired private CenterFeign centerFeign; @GetMapping("/optionData-consumer.do") public List<Map<String, Object>> optionData() { return centerFeign.optionData(); } @PostMapping("/showEmpData-consumer.do") public List<Map<String, Object>> showEmpData(@RequestBody Emp emp) { return centerFeign.showEmpData(emp); } @PostMapping("/add-consumer.do") public Integer add(@RequestBody Emp emp) { return centerFeign.add(emp); } @PostMapping("/edit-consumer.do") public Integer edit(@RequestBody Emp emp) { return centerFeign.edit(emp); } @GetMapping("/del-consumer.do") public Integer del(@RequestParam("empno") Integer empno) { return centerFeign.del(empno); } }
再用postman測試,都沒有問題
注意,這裏測試的都是http://localhost:8764/XXX-consumer.do
的url
XXX爲consumer的controller中的Mapping映射
步驟和3同樣,就名改爲two
<dependency> <groupId>cn.kgc</groupId> <artifactId>employee-common</artifactId> <version>1.0-SNAPSHOT</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <!--修改版本號--> <version>5.1.38</version> </dependency>
//啓用eureka客戶端 @EnableEurekaClient //Mapper掃描,對應的mapper包 @MapperScan("cn.kgc.mapper") @SpringBootApplication public class ProviderTwoApplication { public static void main(String[] args) { SpringApplication.run(ProviderTwoApplication.class, args); } }
application.properties
,也直接扒拉,把端口號改一改#服務端口號 server.port=8763 #應用名 spring.application.name=provider #eureka客戶端服務url默認區域 eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/ #數據源驅動類名 spring.datasource.driver-class-name=com.mysql.jdbc.Driver #數據源url spring.datasource.url=jdbc:mysql:///kh75 #數據源用戶名 spring.datasource.username=root #數據源密碼 spring.datasource.password=admin #後期會寫mapper.xml,這裏先註釋 #mybatis.mapper-locations=classpath:mapper/*.xml #給實體類起別名,一樣這裏先註釋 #mybatis.type-aliases-package=cn.kgc.vo
application.properties
#端口號 server.port=8764 #應用名 spring.application.name=consumer #eureka客戶端服務url默認區域 eureka.client.serviceUrl.defaultZone=http://localhost:8761/eureka/ #下線名稱.ribbon.NF加載平衡規則類名,默認是輪詢,如今改成隨機,RandomRule:隨機選擇一個服務節點 provider.ribbon.NFLoadBalancerRuleClassName=com.netflix.loadbalancer.RandomRule
/showEmpData.do
中加打印@PostMapping("/showEmpData.do") //Feign:不支持對象傳參,因此要用@RequestBody public List<Map<String, Object>> showEmpData(@RequestBody Emp emp) { System.out.println("provider-one>>>>"+emp); return empService.showEmpData(emp); }
/showEmpData.do
中加打印@PostMapping("/showEmpData.do") //Feign:不支持對象傳參,因此要用@RequestBody public List<Map<String, Object>> showEmpData(@RequestBody Emp emp) { System.out.println("provide-two>>>>"+emp); return empService.showEmpData(emp); }
/showEmpData-consumer.do
測10次看後臺打印是否是隨機的one:有6個
two:有4個
因此負載均衡策略是隨機的
那如今把上面的註釋
#下線名稱.ribbon.NF加載平衡規則類名,這裏先註釋provider.ribbon.NFLoadBalancerRuleClassName=com.netflix.loadbalancer.RandomRule
仍是測10次,結果:
one:5次
two:5次
爲了防止巧合,再測10次一共20次,結果:
one:10次
two:10次
因此,如下這句話起做用了
#下線名稱.ribbon.NF加載平衡規則類名,這裏先註釋provider.ribbon.NFLoadBalancerRuleClassName=com.netflix.loadbalancer.RandomRule
employee-common
eureka-server
employee-common
provider-one
provider-two
consumer
Ribbon提供了多鍾負載均衡策略: 1 WeightedResponseTimeRule:根據響應時間分配一個weight(權重,大小的概念),響應時間和weight成反比 2.RoundRobinRule:輪詢選擇服務節點(默認的負載均衡策略) 3.RandomRule:隨機選擇一個服務節點 4.ZoneAvoidanceRule:綜合考慮服務節點所在區域的性能和服務節點的可用性來選擇服務節點 5.RetryRule:重試機制.在一個配置時間段內,當選擇服節點不成功時會一直嘗試從新選擇 6.BestAvailableRule:選擇一個併發請求最小的服務器節點. 7.AvailabilityFilteringRule:過濾掉由於一直鏈接失敗而被標記爲circuit tripped的服務節點和那些高併發的服務節點(active connections超過配置值)