[英]Creating a RESTful web service with Spring Boot
I am learning RESTful web services using Spring boot. 我正在使用Spring Boot学习RESTful Web服务。 I am trying to create a web service that fetches address of a particular client.However when I try running the service i keep getting the following error:
我正在尝试创建一个获取特定客户端地址的Web服务,但是当我尝试运行该服务时,却不断出现以下错误:
Whitelabel Error Page
白标错误页面
This application has no explicit mapping for /error, so you are seeing this as a fallback.
此应用程序没有针对/ error的显式映射,因此您将其视为后备。
Sun Jan 03 11:20:44 CST 2016 There was an unexpected error (type=Not Found, status=404).
Sun Jan 03 11:20:44 CST 2016有一个意外错误(类型=未找到,状态= 404)。 No message available
无讯息
The URL i am trying to access is 我尝试访问的URL是
http://localhost:8084/showAddress
http:// localhost:8084 / showAddress
Can someone please tell me where am i going wrong. 有人可以告诉我我要去哪里错了。 I downloaded a similar project from a friend's github account and it runs perfectly OK.
我从朋友的github帐户下载了一个类似的项目,它运行正常。 For the sake of simplicity i tried hard coding the values and created the following code in my controller class:
为了简单起见,我尝试对值进行硬编码,并在控制器类中创建以下代码:
package com.digitek.controller;
import java.math.BigInteger;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import com.example.model.Address;
@RestController
public class Controller {
private static BigInteger id;
private static Map<BigInteger, Address> addressMap;
//saves address objects into HashMap
private static void SaveAddress(Address address){
//instantiate hashmap when id is null
if(id == null){
id = BigInteger.ONE;
addressMap = new HashMap<BigInteger,Address>();
}
address.setId(id);
id.add(BigInteger.ONE);
addressMap.put(address.getId(), address);
}
static{
Address a1 = new Address();
a1.setAddress("29 East Judith Ann Drive");
SaveAddress(a1);
Address a2 = new Address();
a1.setAddress("2 East Judith Ann Drive");
SaveAddress(a2);
}
@RequestMapping(value = "/showAddress" ,method=RequestMethod.GET, produces=MediaType.APPLICATION_JSON_VALUE)
public ResponseEntity<Collection<Address>> showMessage(){
Collection<Address> address = addressMap.values();
return new ResponseEntity<Collection<Address>>(address , HttpStatus.OK);
}
}
Here is my pom.xml file 这是我的pom.xml文件
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>AddressService</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>AddressService</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.3.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<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>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Here is the console log 这是控制台日志
2016-01-03 11:09:30.359 INFO 6028 --- [ main] com.example.AddressServiceApplication : Starting AddressServiceApplication on Rishit with PID 6028 (started by Rishit Shah in D:\Rishit\Java workspaces\AddressService)
2016-01-03 11:09:30.364 INFO 6028 --- [ main] com.example.AddressServiceApplication : No active profile set, falling back to default profiles: default
2016-01-03 11:09:30.449 INFO 6028 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@33cb5951: startup date [Sun Jan 03 11:09:30 CST 2016]; root of context hierarchy 2016-01-03 11:09:31.655 INFO 6028 --- [ main] o.s.b.f.s.DefaultListableBeanFactory : Overriding bean definition for bean 'beanNameViewResolver' with a different definition: replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter.class]]
2016-01-03 11:09:32.792 INFO 6028 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8084 (http)
2016-01-03 11:09:32.814 INFO 6028 --- [ main] o.apache.catalina.core.StandardService : Starting service Tomcat 2016-01-03 11:09:32.816 INFO 6028 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.0.30 2016-01-03 11:09:32.965 INFO 6028 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2016-01-03 11:09:32.965 INFO 6028 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2521 ms
2016-01-03 11:09:33.628 INFO 6028
--- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2016-01-03 11:09:33.637 INFO 6028 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2016-01-03 11:09:33.639 INFO 6028
--- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2016-01-03 11:09:33.639 INFO 6028 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2016-01-03 11:09:33.639 INFO 6028
--- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2016-01-03 11:09:34.221 INFO 6028 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@33cb5951: startup date [Sun Jan 03 11:09:30 CST 2016]; root of context hierarchy 2016-01-03 11:09:34.315 INFO 6028 --- [ 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.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2016-01-03 11:09:34.317 INFO 6028 --- [ 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.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2016-01-03 11:09:34.371 INFO 6028 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2016-01-03 11:09:34.371 INFO 6028 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2016-01-03 11:09:34.421 INFO 6028 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2016-01-03 11:09:34.588 INFO 6028 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2016-01-03 11:09:34.753 INFO 6028 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8084 (http)
2016-01-03 11:09:34.764 INFO 6028 --- [ main] com.example.AddressServiceApplication : Started AddressServiceApplication in 4.867 seconds (JVM running for 5.705)
2016-01-03 11:10:03.737 INFO 6028 --- [nio-8084-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet 'dispatcherServlet' 2016-01-03 11:10:03.737 INFO 6028 --- [nio-8084-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started 2016-01-03 11:10:03.759 INFO 6028 --- [nio-8084-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 22 ms
PS I tried running the application on different ports, tried deleting and re creating it, and also tried running a similar application i downloaded from github created by my friend. PS我尝试在不同端口上运行该应用程序,尝试删除并重新创建它,还尝试运行我从我的朋友创建的github下载的类似应用程序。 Each time his application works but mine doesn't.
每次他的应用程序有效但我的无效。 I also made sure each and elements of our pom files match.
我还确保pom文件的每个和元素都匹配。 Thank you in advance
先感谢您
Make sure that your main class is in a root package above other classes. 确保主类位于其他类之上的根包中。
When you run a Spring Boot Application, (ie a class annotated with @SpringBootApplication
), Spring will only scan the classes below your main class package. 当您运行Spring Boot Application(即用
@SpringBootApplication
注释的类)时,Spring将仅扫描主类包下方的类。
com
+- digitek
+- Application.java <--- your main class should be here, above your controller classes
|
+- model
| +- Address.java
+- controller
+- AddressController.java
The problem in your case was that Spring could not find the controller you created, because you placed it in a directory which was not scanned by Spring. 您遇到的问题是Spring无法找到您创建的控制器,因为您将其放置在了Spring尚未扫描的目录中。
There is a chapter in the docs explaining how to structure your code using spring boot here. 文档中有一章介绍了如何使用Spring Boot构造代码。
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