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我实际上使用Neo4j中的社区插件,并尝试通过java发出POST请求来查询neo4j服务器。Neo4j其余调用使用Java(不在嵌入式模式)
我总是得到一个java.io.IOException:服务器返回的HTTP响应代码:400 虽然类似的调用通过JavaScript工作,但业务逻辑建议通过Java调用。
这里是我的代码片段:
String baseURL="ip_of_server";
StringBuilder builder = new StringBuilder();
try {
URL url = new URL(baseURL);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setDoOutput(true);
connection.setDoInput(true);
connection.setRequestMethod("POST");
connection.setRequestProperty("Content-Type", "application/json");
OutputStream os=connection.getOutputStream();
OutputStreamWriter writer = new OutputStreamWriter(os,Charset.forName("UTF-8"));
System.out.println(url);
Map<String, Object> params = new HashMap<String, Object>();
params.put("query", "start x = node(3) return x");
HashMap<String,String> test3= new HashMap<String,String>();
params.put("params", test3);
ObjectMapper temp = new ObjectMapper();
String testString= temp.writeValueAsString(params);
writer.write(testString);
writer.close();
os.close();
String line = null;
BufferedReader reader = new BufferedReader(new InputStreamReader(
connection.getInputStream()));
while ((line = reader.readLine()) != null) {
builder.append(line);
}
System.out.println("Response from server for request : " + url.toString() + " is ");
System.out.println(builder.toString());
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
有什么建议?
我的这个问题可以提供一些提示 - http://stackoverflow.com/questions/15260994/error-401-unauthorized-for-neo4j-rest-url-on-heroku – Gopi 2013-05-07 17:19:44
我现在还没有在neo4j db中设置密码。在我看来,查询是在POST中发送的问题。难道是因为多个“=”? – neoeahit 2013-05-07 17:35:44
我可以做这样的查询,但现在我不能在查询 :** curl -v -H“Content-Type:application/json”-d“{\”查询中包含node_auto_index(name =“xxx”) \“:\”start x = node(3)return x.name \“}”“url”** – neoeahit 2013-05-09 15:42:23