用Java创建一个简单的Restful api
用Java创建一个简单的Restful api
提问于 2019-01-24 21:13:57
我正在尝试通过intellij创建一个简单的Restful hello world api。我用maven-archetype-quickstart创建了一个maven项目，然后在pom.xml中添加了
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxrs</artifactId>
<version>2.3.7.Final</version>
<scope>provided</scope>
</dependency>然后在src->main->java->webservice中有两个文件: App.java
package webservice;
/**
* Hello world!
*
*/
public class App
{
public static void main( String[] args )
{
System.out.println( "Hello World!" );
}
}和BookRestService.java
package webservice;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
@Path("/book")
public class BookRestService {
@GET
@Produces("text/plain")
public String getBookTitle() {
return "H2G2";
}
}我使用的是jBoss-6.4。Jboss似乎开始给我以下信息：
15:08:01,550 INFO [org.jboss.ws.common.management] (MSC service thread 1-2) JBWS022052: Starting JBoss Web Services - Stack CXF Server 4.3.4.Final-redhat-1
15:08:01,824 INFO [org.jboss.as.remoting] (MSC service thread 1-1) JBAS017100: Listening on 127.0.0.1:4447
15:08:01,824 INFO [org.jboss.as.remoting] (MSC service thread 1-7) JBAS017100: Listening on 127.0.0.1:9999
15:08:01,827 INFO [org.jboss.as.server.deployment.scanner] (MSC service thread 1-3) JBAS015012: Started FileSystemDeploymentService for directory /home/symeon/myprojects/applicationserver/jboss-eap-6.4-clean/standalone/deployments
15:08:02,113 INFO [org.jboss.as] (Controller Boot Thread) JBAS015961: Http management interface listening on http://127.0.0.1:9990/management
15:08:02,114 INFO [org.jboss.as] (Controller Boot Thread) JBAS015951: Admin console listening on http://127.0.0.1:9990
15:08:02,115 INFO [org.jboss.as] (Controller Boot Thread) JBAS015874: JBoss EAP 6.4.0.GA (AS 7.5.0.Final-redhat-21) started in 5345ms - Started 153 of 191 services (57 services are lazy, passive or on-demand)
Connected to server
[2019-01-24 03:08:02,544] Artifact webservice: Artifact is being deployed, please wait...
15:08:02,721 INFO [org.jboss.as.server.deployment] (MSC service thread 1-6) JBAS015876: Starting deployment of "webservice" (runtime-name: "webservice.war")
15:08:03,236 INFO [org.jboss.web] (ServerService Thread Pool -- 7) JBAS018210: Register web context: /webservice
15:08:03,400 INFO [org.jboss.as.server] (management-handler-thread - 2) JBAS015859: Deployed "webservice" (runtime-name : "webservice.war")
[2019-01-24 03:08:03,428] Artifact webservice: Artifact is deployed successfully
[2019-01-24 03:08:03,428] Artifact webservice: Deploy took 884 milliseconds我所期望的是，当我打开浏览器并编写http://localhost:8080/book时，会看到H2G2作为答案。我也尝试过http://localhost:8080/webservice/book，因为它提到web context已经注册到/webservice，但再次没有成功。我得到一个404未找到的错误。我哪里做错了？
回答 3
Stack Overflow用户
回答已采纳
发布于 2019-01-24 21:31:44
在您的App.java中，您需要定义ApplicationPath。类似于下面的内容。
import java.util.HashSet;
import java.util.Set;
import javax.ws.rs.ApplicationPath;
import javax.ws.rs.core.Application;
@ApplicationPath("/restRoot")
public class App extends Application {
@Override
public Set<Class<?>> getClasses() {
HashSet<Class<?>> classes = new HashSet<Class<?>>();
classes.add(BookRestService.class);
return classes;
}
}在此之后，您的REST url将变为
http://localhost:8080/webservice/restRoot/bookStack Overflow用户
发布于 2019-01-24 21:18:52
Register web context: /webservice这意味着您所编码的所有路径都必须在/webservice之后。因此您应该使用http://localhost:8080/webservice/book而不是http://localhost:8080/book
Stack Overflow用户
发布于 2019-01-24 21:27:00
默认情况下，resteasy不会扫描整个项目的服务类。你需要告诉resteasy来扫描它。在web.xml中使用以下代码启用扫描。
<context-param>
<param-name>resteasy.scan</param-name>
<param-value>true</param-value>
</context-param>页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/54347519
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