上一篇文章中已经讲述 Feign的基本用法,本章主要概述 FeignClient
GET/POST/PUT/DELETE restful写法以及 Feign 拦截器,与配置优化方案,关闭HttpClient开启OKHTTP…
- 准备工作
1.启动Consul,所有文章都将以Consul作为服务注册中心
2.创建 battcn-feign-hello,battcn-feign-hi(本文代码基于上篇改造)
3.服务(Hi)-> FeignClient -> 服务(Hello),通过实现 RequestInterceptor 传递 header 信息
- battcn-feign-hello
- pom.xml
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<dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-consul-discovery</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies>
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- BattcnFeignHelloApplication.java
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@SpringBootApplication @EnableDiscoveryClient public class BattcnFeignHelloApplication {
public static void main(String[] args) { SpringApplication.run(BattcnFeignHelloApplication.class, args); } }
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- Student.java
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public class Student {
private Long id; private String name; private String email;
//...get set @Override public String toString() { return "Student{" + "id=" + id + ", name='" + name + '\'' + ", email='" + email + '\'' + '}'; } public Student(){} public Student(Long id, String name, String email) { this.id = id; this.name = name; this.email = email; } }
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- HelloController.java
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@RestController @RequestMapping("/hello") public class HelloController {
@Autowired HttpServletRequest request;
static Logger LOGGER = LoggerFactory.getLogger(HelloController.class);
@ResponseStatus(HttpStatus.OK) @GetMapping public Student findStudentByName(@RequestParam("name") String name,@RequestHeader(name = "token",required = false)) { // TODO:不做具体代码实现,只打印Log LOGGER.info("[查询参数] - [{}]", name); LOGGER.info("[Token] - [{}]",token); LOGGER.info("[Auth] - [{}]",request.getHeader("Auth")); return new Student(1L,"挽歌-GET","1837307557@qq.com"); }
@ResponseStatus(HttpStatus.CREATED) @PostMapping public Student addStudent(@RequestBody Student student) { // TODO:不做具体代码实现,只打印Log LOGGER.info("[添加信息] - [{}]", student.toString()); return new Student(2L,"挽歌-SAVA","1837307557@qq.com"); }
@ResponseStatus(HttpStatus.CREATED) @PutMapping("/{studentId}") public Student editStudent(@RequestBody Student student, @PathVariable("studentId") Long studentId) { // TODO:不做具体代码实现,只打印Log LOGGER.info("[修改信息] - [{}]", student.toString()); return new Student(3L,"挽歌-EDIT","1837307557@qq.com"); }
@ResponseStatus(HttpStatus.NO_CONTENT) @DeleteMapping("/{studentId}") public void deleteStudent(@PathVariable("studentId") Long studentId) { // TODO:不做具体代码实现,只打印Log LOGGER.info("[根据编号删除学生] - [{}]", studentId); } }
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- bootstrap.yml
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server: port: 8765
spring: application: name: battcn-feign-hello cloud: consul: host: localhost port: 8500 enabled: true discovery: enabled: true prefer-ip-address: true
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- 测试
访问:http://localhost:8765/hello?name=Levin
显示:{"id":1,"name":"挽歌-GET","email":"1837307557@qq.com"}
代表我们服务启动成功
- battcn-feign-hi
- pom.xml
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<dependencies> <dependency> <groupId>io.github.openfeign</groupId> <artifactId>feign-okhttp</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-feign</artifactId> </dependency> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-consul-discovery</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-actuator</artifactId> </dependency> <dependency> <groupId>com.battcn</groupId> <artifactId>battcn-starter-swagger</artifactId> <version>1.0.1</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies>
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- BattcnFeignHiApplication.java
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@EnableDiscoveryClient @EnableFeignClients @SpringBootApplication public class BattcnFeignHiApplication {
public static void main(String[] args) { SpringApplication.run(BattcnFeignHiApplication.class, args); }
}
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- HiController.java
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@RestController @RequestMapping("/hi") public class HiController {
static Logger LOGGER = LoggerFactory.getLogger(HiController.class);
@Autowired HelloClient helloClient;
@ResponseStatus(HttpStatus.OK) @GetMapping public Student find(@RequestParam("name") String name,@RequestHeader(name="token",required = false)String token) { // TODO:只是演示Feign调用的方法 LOGGER.info("[Token] - [{}]",token); return helloClient.findStudentByName(name,token); }
@ResponseStatus(HttpStatus.CREATED) @PostMapping public Student add(@RequestBody Student student) { // TODO:只是演示Feign调用的方法 return helloClient.addStudent(student); }
@ResponseStatus(HttpStatus.CREATED) @PutMapping("/{studentId}") public Student edit(@RequestBody Student student, @PathVariable("studentId") Long studentId) { // TODO:只是演示Feign调用的方法 return helloClient.editStudent(student, studentId); }
@ResponseStatus(HttpStatus.NO_CONTENT) @DeleteMapping("/{studentId}") public void delete(@PathVariable("studentId") Long studentId) { // TODO:只是演示Feign调用的方法 helloClient.deleteStudent(studentId); } }
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- MyFeignInterceptor.java
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/** * 传递Token * @author Levin * @date 2017-07-29. */ @Configuration public class MyFeignInterceptor implements RequestInterceptor { @Override public void apply(RequestTemplate requestTemplate) { requestTemplate.header("Auth","My Name's request header Auth"); } }
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- HelloClient.java
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package com.battcn.client;
import com.battcn.pojo.Student; import org.springframework.cloud.netflix.feign.FeignClient; import org.springframework.http.HttpStatus; import org.springframework.web.bind.annotation.*;
/** * 模拟完整的CRUD操作 */ @FeignClient(name = "battcn-feign-hello") public interface HelloClient {
@ResponseStatus(HttpStatus.OK) @GetMapping("/hello") Student findStudentByName(@RequestParam("name") String name,@RequestHeader(name="token",required = false)String token);
@ResponseStatus(HttpStatus.CREATED) @PostMapping("/hello") Student addStudent(@RequestBody Student student);
@ResponseStatus(HttpStatus.CREATED) @PutMapping("/hello/{studentId}") Student editStudent(@RequestBody Student student, @PathVariable("studentId") Long studentId);
@ResponseStatus(HttpStatus.NO_CONTENT) @DeleteMapping("/hello/{studentId}") void deleteStudent(@PathVariable("studentId") Long studentId); }
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- bootstrap.yml
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server: port: 8766
spring: application: name: battcn-feign-hi cloud: consul: host: localhost port: 8500 enabled: true discovery: enabled: true prefer-ip-address: true
#Hystrix支持,如果为true,hystrix库必须在classpath中 feign: okhttp: enabled: true #开启OKHTTP支持,依赖 (feign-okhttp)默认HttpClient #请求和响应GZIP压缩支持 compression: request: enabled: true #支持压缩的mime types mime-types: text/xml,application/xml,application/json min-request-size: 2048 response: enabled: true hystrix: enabled=false # 日志支持 logging: level: project.com.battcn.UserClient: DEBUG
#以下就是需要写的配置,注意base-package就可以了 swagger: enable: true #是否开启Swagger api-info: description: ${spring.application.name} license: ${spring.application.name} license-url: http://blog.battcn.com terms-of-service-url: http://blog.battcn.com title: 鏖战八方 version: "@project.version@" contact: email: 1837307557@qq.com name: 挽歌 url: http://blog.battcn.com docket: base-package: com.battcn.controller #扫描路径,建议以Controller的父包为主 group-name: ${spring.application.name}
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- 测试
访问:http://localhost:8766/swagger-ui.html
使用Swagger做测试
swagger测试
此处只演示GET,PUT,DELETE,POST 示例代码都包括,自行测试即可
日志:
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2017-07-29 18:21:26.854 INFO 12620 --- [nio-8765-exec-2] com.battcn.controller.HelloController : [查询参数] - [Levin] 2017-07-29 18:21:26.854 INFO 12620 --- [nio-8765-exec-2] com.battcn.controller.HelloController : [Token] - [Token HA] 2017-07-29 18:21:26.854 INFO 12620 --- [nio-8765-exec-2] com.battcn.controller.HelloController : [Auth] - [My Name's request header Auth]
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如果未实现 RequestInterceptor 那么 LOGGER.info("[Auth] - [{}]",request.getHeader("Auth"));
就无法获取到 request 中的信息
- 流程图
画图工具:https://www.processon.com/
流程图
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