Dockerized SpringBoot REST api 不支持请求方法“GET”

Question

我有一个小的spring应用如下图：

package com.example.demo.api;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RequestMapping("api/factorial")
@RestController
public class TestApi {

    @GetMapping
    public long factorial(){
        long startTime = System.nanoTime();
        int i;
        double fact=1;
        int number=50;//It is the number to calculate factorial
        for(i=1;i<=number;i++){
            fact=fact*i;
            System.out.println("Factorial of "+i+" is: "+fact);
        }
        long endTime = System.nanoTime();
        return (endTime - startTime);
    }
}

我已经生成了这个应用程序的一个 jar 并对其进行了 docker 化，如下所示：

FROM openjdk:8-jdk-alpine
ADD  ./demo-0.0.1-SNAPSHOT.jar /usr/src/factorial/
WORKDIR /usr/src/factorial
EXPOSE 8080
CMD java -XX:+PrintFlagsFinal $JAVA_OPTIONS -jar demo-0.0.1-SNAPSHOT.jar

然后我运行以下命令运行 docker 容器

docker run --rm --name factorialContainer -p 8080:8080 -e JAVA_OPTIONS="$(cat jvmFlags.txt)" suleka96/factorial:latest

然后我尝试使用 JMeter 向 REST 端点发出 HTTP 请求，如下所示

问题是，当我这样做时，我收到一条错误消息：

org.springframework.web.HttpRequestMethodNotSupportedException： 不支持请求方法“GET”

但是，当我在本地运行 spring 应用程序时（没有对其进行 dockerizing） 并从 JMeter 发送请求，请求成功发送。

我做错了什么？

Answer 1

您的应用程序部署在 docker 中，因此它是虚拟机。那是另一台拥有自己IP地址的主机。但是您正在尝试向本地主机发送 GET 请求。你应该得到你的 docker ip。 在 Mac OS 中输入这个来获取 ip

host> docker-machine ip 默认

访问该页面 https://spring.io/guides/gs/spring-boot-docker/ 在该知识库中有一个关于 mac os 部署的部分

Answer 2

这背后的原因必须在日志中。

这是我的设置，我更改了控制器，使其返回 json 而不是 long 原语：

控制器

@RequestMapping("api/factorial")
@RestController
public class TestApi {

    @GetMapping
    public Map<String, Long> factorial(){
        long startTime = System.nanoTime();
        int i;
        double fact=1;
        int number=50;//It is the number to calculate factorial
        for(i=1;i<=number;i++){
            fact=fact*i;
            System.out.println("Factorial of "+i+" is: "+fact);
        }
        long endTime = System.nanoTime();
        Map<String, Long> res = new HashMap<String, Long>();
        res.put("time_in_nanos", (endTime - startTime));
        return res;
    }
}

应用

@SpringBootApplication(scanBasePackages = "com.example.demo")
public class Application {

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

pom

ml 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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.example</groupId>
    <artifactId>demo</artifactId>
    <version>1.0</version>
    <packaging>jar</packaging>

    <properties>
        <springboot.version>2.0.8.RELEASE</springboot.version>
    </properties>

    <dependencies>
    <!-- Springboot -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-configuration-processor</artifactId>
        <version>${springboot.version}</version>
        <scope>compile</scope>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-actuator</artifactId>
        <version>${springboot.version}</version>
        <optional>true</optional>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <version>${springboot.version}</version>
        <optional>true</optional>
    </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <version>${springboot.version}</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>build-info</goal>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>


</project>

Docker 命令行

docker run --rm --name apiTest -p 8080:8080  321225ee07bb

我几乎照原样使用了你的 Dockerfile

从容器中退出：

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.0.8.RELEASE)

2020-02-04 22:55:03.774  INFO 1 --- [           main] com.example.demo.api.Application         : Starting Application on 33f1f71d079b with PID 1 (/usr/src/factorial/demo-1.0.jar started by root in /usr/src/factorial)
2020-02-04 22:55:03.796  INFO 1 --- [           main] com.example.demo.api.Application         : No active profile set, falling back to default profiles: default
2020-02-04 22:55:04.076  INFO 1 --- [           main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@2f410acf: startup date [Tue Feb 04 22:55:04 GMT 2020]; root of context hierarchy
2020-02-04 22:55:08.891  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2020-02-04 22:55:09.002  INFO 1 --- [           main] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2020-02-04 22:55:09.004  INFO 1 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.5.37
2020-02-04 22:55:09.055  INFO 1 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener   : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [/usr/lib/jvm/java-1.8-openjdk/jre/lib/amd64/server:/usr/lib/jvm/java-1.8-openjdk/jre/lib/amd64:/usr/lib/jvm/java-1.8-openjdk/jre/../lib/amd64:/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib]
2020-02-04 22:55:09.305  INFO 1 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2020-02-04 22:55:09.307  INFO 1 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 5236 ms
2020-02-04 22:55:10.617  INFO 1 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'characterEncodingFilter' to: [/*]
2020-02-04 22:55:10.626  INFO 1 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'webMvcMetricsFilter' to: [/*]
2020-02-04 22:55:10.636  INFO 1 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2020-02-04 22:55:10.641  INFO 1 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2020-02-04 22:55:10.645  INFO 1 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'requestContextFilter' to: [/*]
2020-02-04 22:55:10.647  INFO 1 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean   : Mapping filter: 'httpTraceFilter' to: [/*]
2020-02-04 22:55:10.649  INFO 1 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean  : Servlet dispatcherServlet mapped to [/]
2020-02-04 22:55:11.290  INFO 1 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2020-02-04 22:55:11.658  INFO 1 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext@2f410acf: startup date [Tue Feb 04 22:55:04 GMT 2020]; root of context hierarchy
2020-02-04 22:55:11.864  INFO 1 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/api/factorial],methods=[GET]}" onto public java.util.Map<java.lang.String, java.lang.Long> com.example.demo.api.TestApi.factorial()
2020-02-04 22:55:11.879  INFO 1 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2020-02-04 22:55:11.880  INFO 1 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2020-02-04 22:55:11.960  INFO 1 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2020-02-04 22:55:11.962  INFO 1 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2020-02-04 22:55:12.745  INFO 1 --- [           main] o.s.b.a.e.web.EndpointLinksResolver      : Exposing 2 endpoint(s) beneath base path '/actuator'
2020-02-04 22:55:12.787  INFO 1 --- [           main] s.b.a.e.w.s.WebMvcEndpointHandlerMapping : Mapped "{[/actuator/health],methods=[GET],produces=[application/vnd.spring-boot.actuator.v2+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.web.servlet.AbstractWebMvcEndpointHandlerMapping$OperationHandler.handle(javax.servlet.http.HttpServletRequest,java.util.Map<java.lang.String, java.lang.String>)
2020-02-04 22:55:12.792  INFO 1 --- [           main] s.b.a.e.w.s.WebMvcEndpointHandlerMapping : Mapped "{[/actuator/info],methods=[GET],produces=[application/vnd.spring-boot.actuator.v2+json || application/json]}" onto public java.lang.Object org.springframework.boot.actuate.endpoint.web.servlet.AbstractWebMvcEndpointHandlerMapping$OperationHandler.handle(javax.servlet.http.HttpServletRequest,java.util.Map<java.lang.String, java.lang.String>)
2020-02-04 22:55:12.796  INFO 1 --- [           main] s.b.a.e.w.s.WebMvcEndpointHandlerMapping : Mapped "{[/actuator],methods=[GET],produces=[application/vnd.spring-boot.actuator.v2+json || application/json]}" onto protected java.util.Map<java.lang.String, java.util.Map<java.lang.String, org.springframework.boot.actuate.endpoint.web.Link>> org.springframework.boot.actuate.endpoint.web.servlet.WebMvcEndpointHandlerMapping.links(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2020-02-04 22:55:12.950  INFO 1 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup
2020-02-04 22:55:13.124  INFO 1 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2020-02-04 22:55:13.135  INFO 1 --- [           main] com.example.demo.api.Application         : Started Application in 10.73 seconds (JVM running for 12.233)

我要寻找的是 GET 请求的映射，如下所示：

2020-02-04 22:55:11.864  INFO 1 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/api/factorial],methods=[GET]}" onto public java.util.Map<java.lang.String, java.lang.Long> com.example.demo.api.TestApi.factorial()