Jeecg-Cloud学习之路（二）

jeecg-config模块：

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">
    <parent>
        <artifactId>jeecg-cloud</artifactId>
        <groupId>jeecg-cloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>jeecg-config</artifactId>


    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!--SpringCloud alibaba nacos-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

        <!--nacos config-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-config</artifactId>
        </dependency>
    </dependencies>
</project>

application.yml

spring:
  profiles:
    active: dev

bootstrap.yml

server:
  port: 8083
spring:
  application:
    name: @artifactId@
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
      config:
        server-addr: 127.0.0.1:8848
        file-extension: yml
        group: DEFAULT_GROUP
        shared-configs: jeecg-common-config.yml

ConfigApplication.java

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

/**
 * @author zx
 */
@SpringBootApplication
@EnableDiscoveryClient
public class ConfigApplication {

    public static void main(String[] args) {
        SpringApplication.run(ConfigApplication.class,args);
    }
}

TestController.java

import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.context.config.annotation.RefreshScope;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("config")
@RefreshScope
public class TestController {

    @Value("${jeecg.edu}")
    private String jeecgEdu;

    @RequestMapping("/test")
    public String test(){
        return jeecgEdu;
    }
}

在TestController里面有个@Value("${jeecg.edu}")，在这地方要记得在nacos里面配置这个参数，不然启动的时候会报错，导致启动不成功

jeecg-gateway模块：

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">
    <parent>
        <artifactId>jeecg-cloud</artifactId>
        <groupId>jeecg-cloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>jeecg-gateway</artifactId>

    <dependencies>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-gateway</artifactId>
        </dependency>

        <!--SpringCloud alibaba nacos-->
        <!--服务注册时需要用到-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>
    </dependencies>

</project>

application.yml

server:
  port: 8084
spring:
  application:
    name: @artifactId@
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
    gateway:
      routes:
        #- id: 123
          #uri: http://127.0.0.1:8082
          #predicates:
           # - Path=/test/**
        #- id: 456
          #uri: http://127.0.0.1:8083
          #predicates:
           # - Path=/config/**
        - id: jeecg-provider
          uri: lb://jeecg-provider
          predicates:
            - Path=/test/**
        - id: jeecg-config
          uri: lb://jeecg-config
          predicates:
            - Path=/config/**

GatewayApplication.java

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

/**
 * @author zx
 */
@SpringBootApplication
@EnableDiscoveryClient
public class GatewayApplication {
    public static void main(String[] args) {
        SpringApplication.run(GatewayApplication.class,args);
    }
}

在application.yml网关有两种跳转的方式，第一种注释了，感兴趣的都可以试试。

jeecg-feign模块：

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">
    <parent>
        <artifactId>jeecg-cloud</artifactId>
        <groupId>jeecg-cloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>jeecg-feign</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!--SpringCloud alibaba nacos-->
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

        <!--服务降级、熔断-->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
    </dependencies>

</project>

application.yml

server:
  port: 8085
spring:
  application:
    name: @artifactId@
  cloud:
    nacos:
      discovery:
        server-addr: 127.0.0.1:8848
feign:
  hystrix:
    enabled: true
  client:
    config:
      jeecg-provider:
        connectTimeout: 4000
        readTimeout: 6000

FeignApplication.java

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.hystrix.EnableHystrix;
import org.springframework.cloud.openfeign.EnableFeignClients;

/**
 * @version V1.0
 * @author: zx
 * @date: 2020-08-29 21:07
 * @Description: TODO
 * @modifiedBy：
 */

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
@EnableHystrix
public class FeignApplication {
    public static void main(String[] args) {
        SpringApplication.run(FeignApplication.class,args);
    }
}

FeignController.java

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.test.jeecg.service.FeignService;

import javax.annotation.Resource;

/**
 * @version V1.0
 * @author: zx
 * @date: 2020-08-29 21:16
 * @Description: TODO
 * @modifiedBy：
 */
@RestController
@RequestMapping("feign")
public class FeignController {

    @Resource
    FeignService feignService;

    @GetMapping("/show/{name}")
    public String showname(@PathVariable("name") String name){
        return  feignService.getName(name);
    }
}

FeignService.java

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.test.jeecg.service.impl.FeignServiceImpl;

/**
 * @version V1.0
 * @author: zx
 * @date: 2020-08-29 21:09
 * @Description: TODO
 * @modifiedBy：
 */

@FeignClient(name = "jeecg-provider",path = "/test",fallback = FeignServiceImpl.class)
public interface FeignService {

    @GetMapping("/showName/{name}")
    public String getName(@PathVariable("name") String name);
}

FeignServiceImpl.java

import org.springframework.stereotype.Component;
import org.test.jeecg.service.FeignService;

/**
 * @version V1.0
 * @author: zx
 * @date: 2020-08-30 9:40
 * @Description: TODO
 * @modifiedBy：
 */
@Component
public class FeignServiceImpl implements FeignService {
    @Override
    public String getName(String name) {
        return "我是降级方法" + name;
    }
}

到此结束了视频的代码部分，大家如果有问题，请下方留言，看到的话会回复的。