主要是针对Spring Cloud新出的版本(2.0.2.RELEASE),一些新的改动,与在使用中遇见的一些问题,踩过的坑,希望后面的人就不用踩了。
服务注入到Eureka需要的MAVEN配置
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
如果找不到包加入下面:
<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>
如果还是不行,再加
<repositories>
<repository>
<id>spring-snapshots</id>
<name>Spring Snapshots</name>
<url>https://repo.spring.io/snapshot</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
<snapshots>
<enabled>false</enabled>
</snapshots>
</repository>
</repositories>
这个呢,是因为比较新,maven可能还么相关的包。
application.yml配置
spring:
application:
name: deal-center
server:
port: 8902
eureka:
client:
serviceUrl:
defaultZone: http://admin:[email protected]:8000/eureka/
启动类
@SpringBootApplication
@EnableEurekaClient
@EnableFeignClients
public class DealCentreApplication {
public static void main(String[] args) {
SpringApplication.run(DealCentreApplication.class, args);
}
}
编写Feign接口类
@FeignClient("user-center")
public interface UserService {
@GetMapping("/user/getUserById")
public User getUserById(@RequestParam("id")Long id);
@GetMapping("/user/getById/{id}")
public User getById(@PathVariable("id")Long id);
@GetMapping("/user/queryUserList")/*这个是不对的*/
public List<User> queryUserList(@RequestBody User user);
}
Feign请求类中,第一个和第二个,都可以请求通。第三个不行。如果都换成POST请求,也可以请求正确。
在SpringCloud 1.5版本的时候,@GetMapping和@PostMapping不支持,现在已经可以了。但是复杂参数时还说不行,报错如下:
UserService#queryUserList(User); content:
{"timestamp":"2018-05-30T09:15:02.095+0000","status":405,"error":"Method Not Allowed","message":"Request method 'POST' not supported","path":"/user/queryUserList"}
意思是说不支持POST请求,可是明明发的是POST请求啊,跟代码走...发现一段代码如下:
privatesynchronizedOutputStream getOutputStream0()throwsIOException {
try{
if(!this.doOutput) {
thrownewProtocolException("cannot write to a URLConnection if doOutput=false - call setDoOutput(true)");
}else{
if(this.method.equals("GET")) {
this.method ="POST";
}
}
}
}
估计因为考虑到restful风格吧,所以建议还说用POST请求,那么真要用GET怎么玩呢?
我采用apach的httpclient替换掉Feign默认使用的连接工具实现类(还没解决,谁有好的解决方案啊?)