Question

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，

{＆＃34;名称＆＃34;：[＆＃34;约翰＆＃34;]} 线程＆＃34; main＆＃34;中的例外情况com.sun.jersey.api.client.ClientHandlerException：java.net.ConnectException：连接被拒绝：连接 at com.sun.jersey.client.urlconnection.URLConnectionClientHandler.handle（URLConnectionClientHandler.java:149）在com.sun.jersey.api.client.Client.handle（Client.java:648）在com.sun.jersey.api.client.WebResource.handle（WebResource.java:670）在com.sun.jersey.api.client.WebResource.access $ 200（WebResource.java:74）在com.sun.jersey.api.client.WebResource $ Builder.post（WebResource.java:553）在neo4j.rest.client.MyRestClient.createNode（MyRestClient.java:30）在neo4j.rest.client.MyRestClient.main（MyRestClient.java:14）引起：java.net.ConnectException：连接被拒绝：连接 at java.net.DualStackPlainSocketImpl.connect0（Native Method）在java.net.DualStackPlainSocketImpl.socketConnect（DualStackPlainSocketImpl.java:69） at java.net.AbstractPlainSocketImpl.doConnect（AbstractPlainSocketImpl.java:337） at java.net.AbstractPlainSocketImpl.connectToAddress（AbstractPlainSocketImpl.java:198） at java.net.AbstractPlainSocketImpl.connect（AbstractPlainSocketImpl.java:180）在java.net.PlainSocketImpl.connect（PlainSocketImpl.java:157）在java.net.SocksSocketImpl.connect（SocksSocketImpl.java:391）在java.net.Socket.connect（Socket.java:579）在java.net.Socket.connect（Socket.java:528）在sun.net.NetworkClient.doConnect（NetworkClient.java:180）在sun.net.www.http.HttpClient.openServer（HttpClient.java:388）在sun.net.www.http.HttpClient.openServer(HttpClient.java:483）在sun.net.www.http.HttpClient。（HttpClient.java:213）在sun.net.www.http.HttpClient.New（HttpClient.java:300）在sun.net.www.http.HttpClient.New（HttpClient.java:316）在sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient（HttpURLConnection.java:992）在sun.net.www.protocol.http.HttpURLConnection.plainConnect（HttpURLConnection.java:928）在sun.net.www.protocol.http.HttpURLConnection.connect（HttpURLConnection.java:846） at sun.net.www.protocol.http.HttpURLConnection.getOutputStream（HttpURLConnection.java:1087） at com.sun.jersey.client.urlconnection.URLConnectionClientHandler $ 1 $ 1.getOutputStream（URLConnectionClientHandler.java:225）在com.sun.jersey.api.client.CommittingOutputStream.commitWrite（CommittingOutputStream.java:117）在com.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）在java.io.OutputStreamWriter.flush（OutputStreamWriter.java:229）在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.writeTo（StringProvider.java:88） at com.sun.jersey.core.impl.provider.entity.StringProvider.writeTo（StringProvider.java:58）在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） ......还有6个

谢谢。

Answer 1

检查您的Neo4j服务器是否已启动并正在运行。只需在浏览器中打开http://localhost:7474即可。
如果您使用Neo4j的默认设置，您的代码将有效。因为默认情况下启用授权。您有两种选择：
1. 将授权标头添加到您的请求中
  
  client.addFilter（new HTTPBasicAuthFilter（＆＃34; neo4j＆＃34;，＆＃34; your_password＆＃34;））;
  - http://neo4j.com/docs/stable/rest-api-security.html
2. 禁用授权

<强> neo4j-server.properties

# Disable authorization
dbms.security.auth_enabled=false

线程＆＃34; main＆＃34;中的例外情况com.sun.jersey.api.client.ClientHandlerException：java.net.ConnectException：连接被拒绝：连接

1 个答案: