从基本的 Spring Boot Camel REST DSL 请求中获取 404“未找到”错误

Question

过去几天我一直在研究 Camel 和 REST DSL 的基本演示，但我终于遇到了这个问题。我对 Spring Boot 的魔法还很陌生，所以非常感谢任何反馈！

当我运行该项目时，对于我的两条路线，一切看起来都正确启动。但是，当我尝试 GET 请求时，总是会收到 404“未找到”消息。

我仅有的两个类在同一个包中，所以我认为可见性不是问题。我将项目创建为 Spring Start 项目，并将其作为 Spring Boot 应用程序运行。日志显示两条路由启动成功，Tomcat使用的是8080端口。上下文路径具体在application.properties文件中配置。

我的主要应用类：

包 com.example.demo;

import org.apache.camel.CamelContext;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@SpringBootApplication
@Configuration
@ComponentScan("com.example.demo")
public class DemoApplication {

@Autowired
CamelContext camelContext;

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

我的路由器类：

package com.example.demo;

import org.springframework.stereotype.Component;
import org.apache.camel.LoggingLevel;
import org.apache.camel.model.rest.RestBindingMode;
import org.apache.camel.builder.RouteBuilder;   

@Component
public class DemoCamelRouter extends RouteBuilder {
    @Override
      public void configure() throws Exception {

        restConfiguration().component("servlet")
            .bindingMode(RestBindingMode.auto);

        rest().get("/hello")
          .to("direct:hello");

       from("direct:hello")
          .log(LoggingLevel.INFO, "Hello World")
          .transform().simple("Hello World");
       }
}

我的 application.properties 文件：

camel.springboot.main-run-controller=true
server.servlet.context-path=/demo

我正在使用http://localhost:8080/demo/hello测试此服务

这是我拥有的 Maven 依赖项。

spring-boot-starter-web (managed:2.1.0.RELEASE)
spring-boot-starter-web-services (managed:2.1.0.RELEASE)
spring-boot-starter-test (managed:2.1.0.RELEASE)
camel-core: 2.22.2
camel-spring-boot-starter: 2.22.2
camel-servlet: 2.22.2
camel-http-common: 2.22.2
javax.servlet-api (managed:4.0.1)

最后，这是日志显示的内容。

2018-11-21 00:58:38.454  INFO 11072 --- [           main] o.a.camel.spring.boot.RoutesCollector    : Starting CamelMainRunController to ensure the main thread keeps running
2018-11-21 00:58:38.470  INFO 11072 --- [           main] o.a.camel.spring.SpringCamelContext      : Route: route2 started and consuming from: direct://hello
2018-11-21 00:58:38.470  INFO 11072 --- [           main] o.a.camel.spring.SpringCamelContext      : Route: route1 started and consuming from: servlet:/hello?httpMethodRestrict=GET
2018-11-21 00:58:38.470  INFO 11072 --- [           main] o.a.camel.spring.SpringCamelContext      : Total 2 routes, of which 2 are started
2018-11-21 00:58:38.470  INFO 11072 --- [           main] o.a.camel.spring.SpringCamelContext      : Apache Camel 2.22.2 (CamelContext: camel-1) started in 0.236 seconds
2018-11-21 00:58:38.486  INFO 11072 --- [           main] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path '/demo'
2018-11-21 00:58:38.501  INFO 11072 --- [           main] com.example.demo.DemoApplication         : Started DemoApplication in 3.882 seconds (JVM running for 6.868)
2018-11-21 01:00:12.445  INFO 11072 --- [nio-8080-exec-4] o.a.c.c.C.[Tomcat].[localhost].[/demo]   : Initializing Spring DispatcherServlet 'dispatcherServlet'
2018-11-21 01:00:12.445  INFO 11072 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : Initializing Servlet 'dispatcherServlet'
2018-11-21 01:00:12.453  INFO 11072 --- [nio-8080-exec-4] o.s.web.servlet.DispatcherServlet        : Completed initialization in 8 ms

Answer 1

从 Camel 的 2.19 版本开始，CamelServlet 默认设置为“/camel”。所以你的网址变成：

http://localhost:8080/demo/camel/hello 

更新：您还需要在使用时定义以下 bean camel-servlet：

@Bean
public ServletRegistrationBean<Servlet> servletRegistrationBean() {
    ServletRegistrationBean<Servlet> registration = new ServletRegistrationBean<>(new CamelHttpTransportServlet(), "/camel/*");
    registration.setName("CamelServlet");
    return registration;
}

或者camel-servlet你应该添加camel-servlet-starter依赖而不是依赖