7、data-business

模块结构

image.png

模块代码

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>spring-cloud</artifactId>
        <groupId>com.yyd.cloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>data-business</artifactId>

    <!-- feign 客户端 在data-consumer配置中开启降级服务-->
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

      <dependency>
            <groupId>io.github.openfeign</groupId>
            <artifactId>feign-httpclient</artifactId>
        </dependency>
    </dependencies>

    <build>
        <plugins>

            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <classifier>exec</classifier>
                </configuration>
            </plugin>

            <!--拷贝依赖jar到lib-->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-dependency-plugin</artifactId>
                <executions>
                    <execution>
                        <id>copy-dependencies</id>
                        <phase>package</phase>
                        <goals>
                            <goal>copy-dependencies</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>${project.build.directory}/lib</outputDirectory>
                            <overWriteReleases>false</overWriteReleases>
                            <overWriteSnapshots>false</overWriteSnapshots>
                            <overWriteIfNewer>true</overWriteIfNewer>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

            <!--拷贝target下的jar到targets-->
            <plugin>
                <artifactId>maven-antrun-plugin</artifactId>
                <executions>
                    <execution>
                        <id>copy-lib-target</id>
                        <phase>package</phase>
                        <configuration>
                            <tasks>
                                <copy todir="../targets">
                                    <fileset dir="target">
                                        <include name="*.jar"/>
                                    </fileset>
                                </copy>
                            </tasks>
                        </configuration>
                        <goals>
                            <goal>run</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>

java
RequestAgent.java

package com.yyd.bussiness.agent;

import com.yyd.bussiness.factory.RequestFactory;
import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.*;

import java.util.Map;

/***
 * @ClassName: RequestAgent
 * @Description: TODO
 * @author: yanyd
 * @Date: 4:44 2020/5/31
 * @version : V1.0
 */
@Component
@FeignClient(value = "data-provide",fallbackFactory = RequestFactory.class)
//@FeignClient(name = "MyClientService",url = "localhost:8080")//name 为注册提供者的服务名或者客户端名称
public interface RequestAgent {

    @PostMapping(value = "/request/data", produces = {"application/json;charset=utf-8"})
    Map requestPost(@RequestBody Map map);

    @GetMapping(value = "/request/data/{param}")
    Map requestGet(@PathVariable("param") String param);

}

---

RequestFactory.java

package com.yyd.bussiness.factory;

import com.yyd.bussiness.agent.RequestAgent;
import feign.hystrix.FallbackFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.Map;

/***
 * @ClassName: RequestFactory
 * @Description: TODO
 * @author: yanyd
 * @Date: 4:45 2020/5/31
 * @version : V1.0
 */
@Component
public class RequestFactory  implements FallbackFactory<RequestAgent> {

    @Override
    public RequestAgent create(Throwable throwable) {
        throwable.printStackTrace();
        return  new RequestAgent() {
            @Override
            public Map requestPost(Map map) {
                map.put("msg","fegin 降级服务,post请求失败...");
                return map;
            }

            @Override
            public Map requestGet(String param) {
                HashMap<String,Object> map=new HashMap<>();
                map.put("msg","fegin 降级服务,get请求失败...");
                map.put("param",param);
                return map;
            }
        };
    }
}