线程“main”中的异常com.sun.jersey.api.client.ClientHandlerException：java.net.ConnectException：连接被拒绝：连接

我使用neo4j 2.2.4

我试试这个程序，这是我的测试代码

package neo4j.rest.client;
import javax.ws.rs.core.MediaType;
import org.json.JSONObject;
import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;
public class MyRestClient {
public static void main(String[] args) {
    MyRestClient jersey = new MyRestClient();
    jersey.createNode();
    jersey.sendCypher();        
}
public void createNode(){   
    //Create a REST Client
    Client client = Client.create();
    //Define a resource (REST Endpoint) which needs to be Invoked 
    //for creating a Node
    WebResource resource = client.resource("http://localhost:7474").path("/db/data/node");
    //Define properties for the node.
    JSONObject node = new JSONObject();
    node.append("Name", "John");        
    System.out.println(node.toString());        
    //Invoke the rest endpoint as JSON request
    ClientResponse res = resource.accept(MediaType.APPLICATION_JSON)
    .entity(node.toString())
    .post(ClientResponse.class);
    //Print the URI of the new Node
    System.out.println("URI of New Node = " + res.getLocation());       
}
public void sendCypher() {
    //Create a REST Client
    Client client = Client.create();
    //Define a resource (REST Endpoint) which needs to be Invoked 
    //for executing Cypher Query
    WebResource resource = client.resource("http://localhost:7474").path("/db/data/cypher");
    //Define JSON Object and Cypher Query
    JSONObject cypher = new JSONObject();
    cypher.accumulate("query", "match n return n limit 10");
    //Invoke the rest endpoint as JSON request
    ClientResponse res = resource.accept(MediaType.APPLICATION_JSON).entity(cypher.toString())
    .post(ClientResponse.class);
    //Print the response received from the Server
    System.out.println(res.getEntity(String.class));
}
}

这是我的错误信息，

{“Name”：[“John”]}线程“main”中的异常com.sun.jersey.api.client.ClientHandlerException：java.net.ConnectException：连接被拒绝：连接com.sun.jersey.client.urlconnection位于com.sun.jersey.api.client.Client.handle（Client.java:648）的com.sun.jersey.api.client.WebResource.handle上的.URLConnectionClientHandler.handle（URLConnectionClientHandler.java:149）（WebResource.java ：670）在com.sun.jersey.api.client.WebResource.access $ 200（WebResource.java:74）at comn . 的com.sun.jersey.api.client.WebResource $ Builder.post（WebResource.java:553）在neo4j.rest.client.MyRestClient.main（MyRestClient.java:14）的.rest.client.MyRestClient.createNode（MyRestClient.java:30）引起：java.net.ConnectException：拒绝连接：在java.net连接 . java.net.AbstractPlainSocketImpl.connect（LivePlainSocketImpl.java:337）的java.net.AualStackPocketSmplImpl.mplConnect（AbstractStlainPlainImpl.java：337）中的java（自动方法） java.net.SocksSocketImpl.connect（SocksSocketSmplImpl.java）中的java.net.PlainSocketImpl.connect（PlainSocketImpl.java:157）中的java.net.AbstractPlainSocketImpl.connect（AbstractPlainSocketImpl.java:180）中的nectToAddress（AbstractPlainSocketImpl.java:198） ：391）at java.net.Socket.connect（Socket.java:579）at java.net.Socket.connect（Socket.java:528）at sun.net.NetworkClient.doConnect（NetworkClient.java:180）at sun .net.www.http.HttpClient.openServer(HttpClient.java:388）at sun.net.www.http.HttpClient.openServer(HttpClient.java:483）at sun.net.www.http.HttpClient . （HttpClient . java：213）at sun.net.www.http.HttpClient.New(HttpClient.java:300）at sun.net.www.http.HttpClient.New（HttpClient.java:316）at sun.net.www.protocol .http.HttpURLConnection.getNewHttpClient（HttpURLConnection.java:992）at sun.net.www.protocol.http.HttpURLConnection.plainConnect（HttpURLConnection.java:928）at sun.net.www.protocol.http.HttpURLConnection.connect（HttpURLConnection .java：846）at sun.net.www.protocol.http.HttpURLConnection.ge tOutputStream（HttpURLConnection.java:1087）at com.sun.jersey.client.urlconnection.URLConnectionClientHandler $ 1 $ 1.getOutputStream（URLConnectionClientHandler.java:225）at com.sun.jersey.api.client.CommittingOutputStream.commitWrite（CommittingOutputStream.java： 117）at.sun.jersey.api.client.CommittingOutputStream.write（CommittingOutputStream.java:89）at sun.nio.cs.StreamEncoder.writeBytes（StreamEncoder.java:221）at sun.nio.cs.StreamEncoder.implFlushBuffer （StreamEncoder.java:291）at sun.nio.cs.StreamEncoder.implFlush（StreamEncoder.java:295）at sun.nio.cs.StreamEncoder.flush（StreamEncoder.java:141）at java.io.OutputStreamWriter.flush（ OutputStreamWriter.java:229）at java.io.BufferedWriter.flush（BufferedWriter.java:254）at com.sun.jersey.core.util.ReaderWriter.writeToAsString（ReaderWriter.java:191）at com.sun.jersey.core .provider.AbstractMessageReaderWriterProvider.writeToAsString（AbstractMessageReaderWriterProvider.java:128）at com.sun.jersey.core.impl.provider.entity.StringProvider.write To（StringProvider.java:88）com.sun.jersey.core.impl.provider.entity.StringProvider.writeTo（StringProvider.java:58）at com.sun.jersey.api.client.RequestWriter.writeRequestEntity（RequestWriter . java：300）at com.sun.jersey.client.urlconnection.URLConnectionClientHandler._invoke（URLConnectionClientHandler.java:204）at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle（URLConnectionClientHandler.java:147) ... 6更多

谢谢 .