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我實際上使用Neo4j中的社區插件,並嘗試通過java發出POST請求來查詢neo4j服務器。Neo4j其餘調用使用Java(不在嵌入式模式)
我總是得到一個java.io.IOException:服務器返回的HTTP響應代碼:400 雖然類似的調用通過JavaScript工作,但業務邏輯建議通過Java調用。
這裏是我的代碼片段:
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();
}
有什麼建議?
我的這個問題可以提供一些提示 - http://stackoverflow.com/questions/15260994/error-401-unauthorized-for-neo4j-rest-url-on-heroku – Gopi 2013-05-07 17:19:44
我現在還沒有在neo4j db中設置密碼。在我看來,查詢是在POST中發送的問題。難道是因爲多個「=」? – neoeahit 2013-05-07 17:35:44
我可以做這樣的查詢,但現在我不能在查詢 :** curl -v -H「Content-Type:application/json」-d「{\」查詢中包含node_auto_index(name =「xxx」) \「:\」start x = node(3)return x.name \「}」「url」** – neoeahit 2013-05-09 15:42:23