用Java創建一個簡單的Restful api

Question

我正在嘗試通過intellij創建一個簡單的Restful hello world api。 我已經使用maven-archetype-quickstart創建了一個maven項目，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，我有兩個文件：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";
    }
}

我正在使用jBoss-6.4。 Jboss似乎開始給我以下消息：

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，當我打開瀏覽器並寫http：// localhost：8080 / book看到H2G2作為答案時。 我還嘗試了http：// localhost：8080 / webservice / book，因為它提到Web上下文已注冊到/ webservice，但再次失敗。 我收到404找不到錯誤。 我做錯了什么？

Answer 1

在您的App.java您需要定義ApplicationPath 。 像下面這樣。

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;
    }
}

之后，您的REST網址將變為

http://localhost:8080/webservice/restRoot/book

Answer 2

Register web context: /webservice

表示您編碼的所有路徑都必須在/ webservice之后。 因此，您應該使用http://localhost:8080/webservice/book而不是http://localhost:8080/book http://localhost:8080/webservice/book

Answer 3

默認情況下，resteasy不會掃描整個項目的服務類。 您需要告訴resteasy進行掃描。 使用web.xml以下代碼來啟用掃描。

<context-param>
    <param-name>resteasy.scan</param-name>
    <param-value>true</param-value>
</context-param>

資源