SpringBoot集成feign，优雅的调用其他项目的接口

向右看齐 2023-02-10 03:49 19阅读 0赞

1.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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.1.4.RELEASE</version>
            <relativePath/> 
        </parent>
        <groupId>com.cxb</groupId>
        <artifactId>springboot</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>springboot-feign</name>
        <description>Demo project for Spring Boot</description>
    
        <properties>
            <java.version>1.8</java.version>
        </properties>
    
            <dependencies>
    
                <dependency>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-test</artifactId>
                    <scope>test</scope>
                </dependency>
    
                <dependency>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-starter-web</artifactId>
                </dependency>
    
                <dependency>
                    <groupId>io.github.openfeign</groupId>
                    <artifactId>feign-core</artifactId>
                    <version>9.5.0</version>
                </dependency>
                <dependency>
                    <groupId>io.github.openfeign</groupId>
                    <artifactId>feign-slf4j</artifactId>
                    <version>9.5.0</version>
                </dependency>
                <dependency>
                    <groupId>io.github.openfeign</groupId>
                    <artifactId>feign-hystrix</artifactId>
                    <version>9.5.0</version>
                </dependency>
                <dependency>
                    <groupId>io.github.openfeign</groupId>
                    <artifactId>feign-jackson</artifactId>
                    <version>9.5.0</version>
                </dependency>
            </dependencies>
        
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

2.application.properties

server.port=9090
    
    feign.client.url = http://localhost:8082/ssm_war

3.book 实体类

package com.cxb.springboot.entity;
    
    import java.io.Serializable;
    
    /**
     * 图书实体
     */
    public class Book implements Serializable {
    
    	private long bookId;// 图书ID
    
    	private String name;// 图书名称
    
    	private int number;// 馆藏数量
    
    	public Book() {
    	}
    
    	public Book(long bookId, String name, int number) {
    		this.bookId = bookId;
    		this.name = name;
    		this.number = number;
    	}
    
    	public long getBookId() {
    		return bookId;
    	}
    
    	public void setBookId(long bookId) {
    		this.bookId = bookId;
    	}
    
    	public String getName() {
    		return name;
    	}
    
    	public void setName(String name) {
    		this.name = name;
    	}
    
    	public int getNumber() {
    		return number;
    	}
    
    	public void setNumber(int number) {
    		this.number = number;
    	}
    
    	@Override
    	public String toString() {
    		return "Book [bookId=" + bookId + ", name=" + name + ", number=" + number + "]";
    	}
    
    
    }

4.BookConfig配置 这里配置了熔断机制，服务方出错，则会访问默认的接口

package com.cxb.springboot.feign;
    
    import com.netflix.hystrix.HystrixCommandProperties;
    import feign.hystrix.HystrixFeign;
    import feign.hystrix.SetterFactory;
    import feign.jackson.JacksonDecoder;
    import feign.jackson.JacksonEncoder;
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    @Configuration
    public class BookConfig {
    
        @Value("${feign.client.url}")
        private String baseUrl;
    
        @Bean
        IBookClient nodeClient() throws InterruptedException {
            return HystrixFeign.builder()
                    .decoder(new JacksonDecoder())
                    .encoder(new JacksonEncoder())
                    .setterFactory((target, method) ->
                            new SetterFactory.Default().create(target, method).
                                    andCommandPropertiesDefaults(HystrixCommandProperties.defaultSetter().
                                            withExecutionTimeoutInMilliseconds(10000)))
                    .target(IBookClient.class, this.baseUrl);
        }
    }

5.IBookClient 这里指定需要访问的接口信息

package com.cxb.springboot.feign;
    
    import com.cxb.springboot.entity.Book;
    import feign.Headers;
    import feign.Param;
    import feign.RequestLine;
    
    @Headers("Content-Type:application/json")
    public interface IBookClient {
    
        @RequestLine("GET /book/getBookById?bookId={bookId}")
        Book getBookById(@Param("bookId") Long bookId);
    
    }

6.HelloController 服务方失败的时候会调用该接口

package com.cxb.springboot.web;
    
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class HelloController {
    
        @GetMapping()
        public String hello(){
            return "hello feign ！";
        }
        
    }

7.启动类，启动该项目

package com.cxb.springboot;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    
    @SpringBootApplication
    public class SpringbootHelloApplication {
    
        public static void main(String[] args) {
            SpringApplication.run(SpringbootHelloApplication.class, args);
        }
    
    }

8.部署需要调用的接口并启动 [https://github.com/ChenXbFrank/ssm/tree/devlop][https_github.com_ChenXbFrank_ssm_tree_devlop] 下载代码

9.测试

[http://localhost:8082/ssm\_war/book/getBookById?bookId=1001][http_localhost_8082_ssm_war_book_getBookById_bookId_1001]

![20200519220830621.png][]

接下来在springboot的项目中调用

[http://localhost:9090/getBookById?bookId=1001][http_localhost_9090_getBookById_bookId_1001]

![20200519220857617.png][]

测试出错的时候：[http://localhost:9090/getBookById666?bookId=1001][http_localhost_9090_getBookById666_bookId_1001] 接口调用失败，默认访问hello feign。

![20200519220925351.png][]

springboot集成feign搞定！

项目下载地址：[https://github.com/ChenXbFrank/springboot-feign][https_github.com_ChenXbFrank_springboot-feign]

[https_github.com_ChenXbFrank_ssm_tree_devlop]: https://github.com/ChenXbFrank/ssm/tree/devlop
[http_localhost_8082_ssm_war_book_getBookById_bookId_1001]: http://localhost:8082/ssm_war/book/getBookById?bookId=1001
[20200519220830621.png]: https://img-blog.csdnimg.cn/20200519220830621.png
[http_localhost_9090_getBookById_bookId_1001]: http://localhost:9090/getBookById?bookId=1001
[20200519220857617.png]: https://img-blog.csdnimg.cn/20200519220857617.png
[http_localhost_9090_getBookById666_bookId_1001]: http://localhost:9090/getBookById666?bookId=1001
[20200519220925351.png]: https://img-blog.csdnimg.cn/20200519220925351.png
[https_github.com_ChenXbFrank_springboot-feign]: https://github.com/ChenXbFrank/springboot-feign