SpingCloud之feign框架调用
1.生产者(没有什么特殊性)
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.example</groupId>
<artifactId>cloud-provider</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging> <name>cloud-provider</name>
<description>Demo project for Spring Boot</description> <parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.6.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>
<spring-cloud.version>Finchley.SR2</spring-cloud.version>
</properties> <dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
<!--Service Discovery with Zookeeper-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies> <dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement> <build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<fork>true</fork>
</configuration>
</plugin>
</plugins>
</build> </project>
application.yml
spring:
datasource:
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql:///testdb?useSSL=true
username: root
password: 123
cloud:
zookeeper:
connect-string: 192.168.3.201:2181
application:
name: provider
mybatis:
configuration:
map-underscore-to-camel-case: true
mapper-locations: classpath:mapper/*Mapper.xml logging:
level:
com.example.cloudprovider.mapper: debug
实体类
package com.example.cloudprovider.domain; import lombok.Getter;
import lombok.Setter; import java.util.Date; @Setter
@Getter
public class UserInfo {
private Integer userId;
private String userName;
private int userAge;
private Date userBirth;
}
Mapper
package com.example.cloudprovider.mapper; import com.example.cloudprovider.domain.UserInfo; public interface UserInfoMapper {
UserInfo getUser(Integer userId);
}
Mapper.xml
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.cloudprovider.mapper.UserInfoMapper">
<select id="getUser" resultType="com.example.cloudprovider.domain.UserInfo">
select user_id, user_name, user_age, user_birth from t_user where user_id = #{userId}
</select>
</mapper>
Service接口
package com.example.cloudprovider.service; import com.example.cloudprovider.domain.UserInfo; public interface UserService {
UserInfo getUser(Integer userId);
}
Service实现
package com.example.cloudprovider.service.impl; import com.example.cloudprovider.domain.UserInfo;
import com.example.cloudprovider.mapper.UserInfoMapper;
import com.example.cloudprovider.service.UserService;
import org.springframework.stereotype.Service; import javax.annotation.Resource; @Service
public class UserServiceImpl implements UserService { @Resource
private UserInfoMapper userMapper; @Override
public UserInfo getUser(Integer userId) {
return userMapper.getUser(userId);
}
}
Controller
package com.example.cloudprovider.controller; import com.example.cloudprovider.domain.UserInfo;
import com.example.cloudprovider.service.UserService;
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; @RestController
public class UserInfoController { @Autowired
private UserService userService; @GetMapping("user/{id}")
public UserInfo getUser(@PathVariable("id") Integer userId) {
return userService.getUser(userId);
}
}
服务发布类
package com.example.cloudprovider; import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication
@MapperScan("com.example.cloudprovider.mapper") //扫描Mapper类 注入到Spring容器中
public class CloudProviderApplication { public static void main(String[] args) {
SpringApplication.run(CloudProviderApplication.class, args);
}
}
2.消费者(引入feign框架)
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.example</groupId>
<artifactId>cloud-consumer</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging> <name>cloud-consumer</name>
<description>Demo project for Spring Boot</description> <parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.6.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>
<spring-cloud.version>Finchley.SR2</spring-cloud.version>
</properties> <dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement> <dependencies>
<!-- 引入feign依赖 -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency> <!--Service Discovery with Zookeeper-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
</dependency> <dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency> <dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies> <build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<fork>true</fork>
</configuration>
</plugin>
</plugins>
</build> </project>
application.yml
spring:
cloud:
zookeeper:
connect-string: 192.168.3.201:2181
discovery:
register: false #不会注册到zk中 provider: # 服务名称
ribbon: # 负载均衡实现依靠ribbon
# 负载策略
NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule #随机策略 其他策略百度
实体类
package com.example.cloudconsumer.vo; import lombok.Getter;
import lombok.Setter; import java.util.Date; @Getter
@Setter
public class UserVO {
private Integer userId;
private String userName;
private Date userBirth;
}
RestTemplate配置类
package com.example.cloudconsumer.config; import org.springframework.boot.SpringBootConfiguration;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate; @SpringBootConfiguration
public class RestTemplateConfiguration { @Bean
@LoadBalanced // Ribbon 负载均衡
public RestTemplate restTemplate() {
return new RestTemplate();
}
}
Controller
package com.example.cloudconsumer.controller; import com.example.cloudconsumer.vo.UserVO;
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 org.springframework.web.client.RestTemplate; @RestController
public class UserWarpController {
@Autowired
private RestTemplate restTemplate; // 调用只有一个或者多个服务实例API的情况下
@GetMapping("warp/user/{userId}")
public UserVO getUserData(@PathVariable("userId") Integer userId) {
return restTemplate.getForObject("http://provider/user/"+userId, UserVO.class);
}
}
使用框架的Controller
package com.example.cloudconsumer.controller; import com.example.cloudconsumer.client.UserClient;
import com.example.cloudconsumer.vo.UserVO;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController; import javax.annotation.Resource; @RestController
public class UserFeignController {
@Resource
private UserClient userClient; // 调用只有一个或者多个服务实例API的情况下
@GetMapping("feign/user/{userId}")
public UserVO getUserData(@PathVariable("userId") Integer userId) {
return userClient.getUserData(userId);
}
}
feign调用客户端
package com.example.cloudconsumer.client; import com.example.cloudconsumer.vo.UserVO;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable; /**
* @FeignClient(name = "provider")
* name为调用服务端的spring.application.name的值
*/
@FeignClient(name = "provider")
public interface UserClient {
@GetMapping("user/{id}")
public UserVO getUserData(@PathVariable("id") Integer userId);
}
服务启动类:
package com.example.cloudconsumer; import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.openfeign.EnableFeignClients; @SpringBootApplication
@EnableDiscoveryClient //可以发现ZK的服务
@EnableFeignClients //可以发现feign的服务
public class CloudConsumerApplication { public static void main(String[] args) {
SpringApplication.run(CloudConsumerApplication.class, args);
}
}
总结起来,feign框架可以理解成路由,对url进行再次包装后供给客户端调用,可以在这个路由上进行一系列限制操作,增强安全性。
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