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  • 原创：Equinox OSGi应用嵌入Jersey框架搭建REST服务

    一、环境

    eclipse版本：eclipse-luna 4.4

    jre版本：1.8

    二、Equinox OSGi应用嵌入Jersey框架搭建REST服务

    1.新建插件工程HelloWebOSGI

      a.

      b.

      c.

      d.在新建的工程中新建文件夹lib，其中放入附件中的jar包（见文末）,全部添加到工程Build Path中。

     

    2.配置运行环境

      a.配置引入包、依赖插件

      b.选择Run->Run Configuration，new一个环境

    保留图中TargetPlatform中的16个Bundle。

      c.在Run Configuration中设置参数

    友情提示：如果有其他异常请查看提示信息，利用 http://www.aolsearch.com/ 查询提示信息（英文），如果发现http://stackoverflow.com/这个网站有相同提问，基本就知道答案近在咫尺了。

                  比如笔者遇到的问题：Root exception:java.lang.IllegalStateException: Workbench has not been created yet.

                  解决方法就是在http://stackoverflow.com/questions/13773582/workbench-has-not-been-created-yet-error-in-eclipse-plugin-programming中找到的。

       d.在MANIFEST.MF(META-INF)文件中将lib文件夹中的包都引入如下图中。

    3.添加代码

    Activator_sample.java

      1 package helloworldosgi;
  2 
  3 import java.util.Dictionary;
  4 import java.util.HashMap;
  5 import java.util.Hashtable;
  6 import java.util.logging.Logger;
  7 
  8 import javax.servlet.ServletException;
  9 
 10 import org.glassfish.jersey.servlet.ServletContainer;
 11 import org.osgi.framework.BundleActivator;
 12 import org.osgi.framework.BundleContext;
 13 import org.osgi.framework.ServiceReference;
 14 import org.osgi.service.event.Event;
 15 import org.osgi.service.event.EventAdmin;
 16 import org.osgi.service.http.HttpService;
 17 import org.osgi.service.http.NamespaceException;
 18 import org.osgi.util.tracker.ServiceTracker;
 19 
 20 /*
 21  * BundleActivator:让你能够捕捉到bundle的start和stop事件，并对这两个事件作出自定义的反应。
 22  */
 23 public class Activator_sample implements BundleActivator {    
 24     private BundleContext bc;
 25     @SuppressWarnings("rawtypes")
 26     private ServiceTracker tracker;
 27     private HttpService httpService = null;
 28     private static final Logger logger = Logger.getLogger(Activator.class.getName());
 29 
 30     /**
 31      * URL前缀
 32      */
 33     public static final String CONTEXT_PATH = "/rest/json";
 34     
 35     /*
 36      * BundleContext:一个bundle在框架中的执行时上下文，这个上下文提供了和框架进行交互的方法。
 37      * @see org.osgi.framework.BundleActivator#start(org.osgi.framework.BundleContext)
 38      */
 39     @SuppressWarnings({ "unchecked", "rawtypes" })
 40     @Override
 41     public synchronized void start(BundleContext bundleContext)    throws Exception {
 42         this.bc = bundleContext;    
 43         logger.info("STARTING HTTP SERVICE BUNDLE");
 44     
 45         this.tracker = new ServiceTracker(this.bc, HttpService.class.getName(),    null) {
 46             @Override
 47             public Object addingService(ServiceReference serviceRef) {
 48                 httpService = (HttpService) super.addingService(serviceRef);
 49                 registerServlets();
 50                 return httpService;
 51             }
 52     
 53             @Override
 54             public void removedService(ServiceReference ref, Object service) {
 55                 if (httpService == service) {
 56                     unregisterServlets();
 57                     httpService = null;
 58                 }
 59                 super.removedService(ref, service);
 60             }
 61         };
 62     
 63         this.tracker.open();
 64     
 65         logger.info("HTTP SERVICE BUNDLE STARTED");
 66     }
 67 
 68     /*
 69      * BundleContext:一个bundle在框架中的执行时上下文，这个上下文提供了和框架进行交互的方法。
 70      * @see org.osgi.framework.BundleActivator#stop(org.osgi.framework.BundleContext)
 71      */
 72     @Override
 73     public synchronized void stop(BundleContext bundleContext) throws Exception {
 74         this.tracker.close();
 75     }
 76     
 77     private void registerServlets() {
 78         try {
 79             rawRegisterServlets();
 80         } catch (InterruptedException | NamespaceException | ServletException ie) {
 81             throw new RuntimeException(ie);
 82         }
 83     }
 84 
 85     private void rawRegisterServlets() throws ServletException,    NamespaceException, InterruptedException {
 86         logger.info("JERSEY BUNDLE: REGISTERING SERVLETS");
 87         logger.info("JERSEY BUNDLE: HTTP SERVICE = " + httpService.toString());
 88     
 89         // TODO - temporary workaround
 90         // This is a workaround related to issue JERSEY-2093; grizzly (1.9.5)
 91         // needs to have the correct context
 92         // classloader set
 93         ClassLoader myClassLoader = getClass().getClassLoader();
 94         ClassLoader originalContextClassLoader = Thread.currentThread()
 95                 .getContextClassLoader();
 96         try {
 97             Thread.currentThread().setContextClassLoader(myClassLoader);
 98             httpService.registerServlet(CONTEXT_PATH, new ServletContainer(),
 99                     getJerseyServletParams(), null);
100             httpService.registerResources(CONTEXT_PATH + "/hello", "/webroot", null);//前面必须带“/”，后面不一定
101         } finally {
102             Thread.currentThread().setContextClassLoader(
103                     originalContextClassLoader);
104         }
105         // END of workaround - after grizzly updated to the recent version, only
106         // the inner call from try block will remain:
107         // httpService.registerServlet("/jersey-http-service", new
108         // ServletContainer(), getJerseyServletParams(), null);
109     
110         sendAdminEvent();
111         logger.info("JERSEY BUNDLE: SERVLETS REGISTERED");
112     }
113 
114     @SuppressWarnings("serial")
115     private void sendAdminEvent() {
116         @SuppressWarnings("rawtypes")
117         ServiceReference eaRef = bc.getServiceReference(EventAdmin.class
118                 .getName());
119         if (eaRef != null) {
120             @SuppressWarnings("unchecked")
121             EventAdmin ea = (EventAdmin) bc.getService(eaRef);
122             ea.sendEvent(new Event("jersey/test/DEPLOYED",
123                     new HashMap<String, String>() {
124                         {
125                             put("context-path", "/");
126                         }
127                     }));
128             bc.ungetService(eaRef);
129         }
130     }
131 
132     private void unregisterServlets() {
133         if (this.httpService != null) {
134             logger.info("JERSEY BUNDLE: UNREGISTERING SERVLETS");
135             httpService.unregister(CONTEXT_PATH);
136             logger.info("JERSEY BUNDLE: SERVLETS UNREGISTERED");
137         }
138     }
139 
140     private Dictionary<String, String> getJerseyServletParams() {
141         Dictionary<String, String> jerseyServletParams = new Hashtable<>();
142         jerseyServletParams.put("javax.ws.rs.Application",
143                 RestApplication.class.getName());
144         logger.info("kira2will" + RestApplication.class.getName());
145         return jerseyServletParams;
146     }
147     
148 
149 }
    View Code

    StatusService.java

     1 package helloworldosgi;
 2 import java.util.ArrayList;
 3 import java.util.List;
 4 import java.util.logging.Logger;
 5 
 6 import javax.ws.rs.GET;
 7 import javax.ws.rs.Path;
 8 import javax.ws.rs.PathParam;
 9 import javax.ws.rs.Produces;
10 import javax.ws.rs.core.MediaType;
11 
12 import data.Node;
13 
14 @Path("/status")
15 public class StatusService {
16 
17     private static final Logger logger = Logger.getLogger(StatusService.class.getName());
18     
19     @GET
20     @Produces(MediaType.APPLICATION_JSON)
21     public Node getStatus(){
22         
23         List<Node> nodes = new ArrayList<Node>();
24         Node node = new Node("001", "60800","192.168.1.1","0","92","92","chizhou","50ms","hw");
25         Node nothingNode = new Node("null","null","null","null","null","null","null","null","null");
26         //nodes.add(node);
27         nodes.add(node);
28         logger.info(node.getName());
29         return node;
30     }
31     
32     @Path("/{id}")
33     @GET
34     @Produces(MediaType.APPLICATION_JSON)
35     public Node getID(@PathParam("id") int id){        
36         List<Node> nodes = new ArrayList<Node>();
37     
38         nodes.add(new Node("null","null","null","null","null","null","null","null","null"));
39         nodes.add(new Node("001", "60600","192.168.1.1","0","92","92","tonglin","50ms","hw"));
40         nodes.add(new Node("002", "60600","192.168.1.1","0","92","92","tonglin","50ms","hw"));
41         nodes.add(new Node("003", "60600","192.168.1.1","0","92","92","tonglin","50ms","hw"));
42         nodes.add(new Node("004", "60600","192.168.1.1","0","92","92","tonglin","50ms","hw"));
43         nodes.add(new Node("005", "60600","192.168.1.1","0","92","92","tonglin","50ms","hw"));        
44         
45         int defaultIndex = 0;
46         if ( (id < 1) || (id > nodes.size() - 1) ){
47             logger.info(nodes.get(defaultIndex).getId());
48             return nodes.get(defaultIndex);
49         }
50         else{
51             logger.info(nodes.get(id).getId());
52             return nodes.get(id);
53         }        
54     }
55 }
    View Code

    RestApplication.java

     1 package helloworldosgi;
 2 
 3 import java.util.HashSet;
 4 import java.util.Set;
 5 
 6 import javax.ws.rs.core.Application;
 7 
 8 import com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider;
 9 
10 public class RestApplication extends Application {
11 
12     @Override
13     public Set<Class<?>> getClasses() {
14         Set<Class<?>> result = new HashSet<Class<?>>();
15 
16         result.add(JacksonJsonProvider.class);
17 
18         result.add(StatusService.class);
19 
20         return result;
21     }
22 }
    View Code

    Node.java

      1 package data;
  2 
  3 import javax.xml.bind.annotation.XmlRootElement;
  4 
  5 @XmlRootElement
  6 public class Node {
  7     
  8     private String id;
  9     private String name;
 10     private String admin_ip;
 11     private String admin_status;
 12     private String longitude;
 13     private String latitude;
 14     private String location;
 15     private String latency;
 16     private String vendor_name;
 17     
 18     public Node(String id,
 19                 String name,
 20                 String admin_ip,
 21                 String admin_status,
 22                 String longitude,
 23                 String latitude,
 24                 String location,
 25                 String latency,
 26                 String vendor_name
 27                 ){
 28         this.id = id;
 29         this.name = name;
 30         this.admin_ip = admin_ip;
 31         this.admin_status = admin_status;
 32         this.longitude = longitude;
 33         this.latitude = latitude;
 34         this.location = location;
 35         this.latency = latency;
 36         this.vendor_name = vendor_name;
 37     }
 38     public String getId() {
 39         return id;
 40     }
 41 
 42     public void setId(String id) {
 43         this.id = id;
 44     }
 45 
 46     public String getName() {
 47         return name;
 48     }
 49 
 50     public void setName(String name) {
 51         this.name = name;
 52     }
 53 
 54     public String getAdmin_ip() {
 55         return admin_ip;
 56     }
 57 
 58     public void setAdmin_ip(String admin_ip) {
 59         this.admin_ip = admin_ip;
 60     }
 61 
 62     public String getAdmin_status() {
 63         return admin_status;
 64     }
 65 
 66     public void setAdmin_status(String admin_status) {
 67         this.admin_status = admin_status;
 68     }
 69 
 70     public String getLongitude() {
 71         return longitude;
 72     }
 73 
 74     public void setLongitude(String longitude) {
 75         this.longitude = longitude;
 76     }
 77 
 78     public String getLatitude() {
 79         return latitude;
 80     }
 81 
 82     public void setLatitude(String latitude) {
 83         this.latitude = latitude;
 84     }
 85 
 86     public String getLocation() {
 87         return location;
 88     }
 89 
 90     public void setLocation(String location) {
 91         this.location = location;
 92     }
 93 
 94     public String getLatency() {
 95         return latency;
 96     }
 97 
 98     public void setLatency(String latency) {
 99         this.latency = latency;
100     }
101 
102     public String getVendor_name() {
103         return vendor_name;
104     }
105 
106     public void setVendor_name(String vendor_name) {
107         this.vendor_name = vendor_name;
108     }    
109 }
    View Code

    4.浏览器中输入 http://localhost:8080/rest/json/status 即可访问public Node getStatus() 返回值。

    或者输入 http://localhost:8080/rest/json/status/2 即可访问public Node getID(@PathParam("id") int id)返回值。

    关于@Path @Get @PathParam 参考 http://www.docin.com/p-317614298.html 第七页。

    http://download.csdn.net/detail/kira_will/9729055
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  • 原文地址：https://www.cnblogs.com/kira2will/p/5040264.html
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