java-api

问题 I am trying to append values to a column of type set, via the JAVA API. It seems that the connector disregards the type of CollectionBehavior I am setting, and always overrides the previous collection. Even when I use CollectionRemove, the value to be removed is added to the collection. I am following the example as shown in: https://datastax-oss.atlassian.net/browse/SPARKC-340?page=com.atlassian.jira.plugin.system.issuetabpanels%3Achangehistory-tabpanel I am using: spark-core_2.11 2.2.0

问题 I am trying to connect to a cluster on qbox the hosting service and I get an error relating to path. I am unsure how to specify the endpoint API. Has anyone any ideas? public Map<String, Object> putJsonDocument(int partid, String partnumber){ Map<String, Object> jsonDocument = new HashMap<String, Object>(); jsonDocument.put("partid", partid); jsonDocument.put("partnumber", partnumber); return jsonDocument; } public void ESUpdate() { org.elasticsearch.node.Node node = org.elasticsearch.node

问题 Is there any tool which provides Java dynamic code generation and that also supports generics? Javassist for example, is the kind of tool that I need, but it does not support generics. I wrote a small lib which uses the Java 6 Compiler API, however as far as I know it depends on JDK. Is there a way to specify another compiler? Or to ship with my application only the parts that I need to invoke with the Java Compiler API? 回答1: It seems you can manipulate and read generic info with Javaassist.

问题 I have two arrays String[] ID1={"19","20","12","13","14"}; String[] ID2={"10","11","12","13","15"}; How can I get following answer while comparing above two arrays. I want to exclude common elements while comparing above two arrays. String[] Result={"14","15","19","20","10","11"}; 回答1: Seems like you want the union of the two sets (no duplicates, right?) minus the intersection: Set<Integer> union = new HashSet<Integer>(Arrays.asList(ID1)); union.addAll(Arrays.asList(ID2); Set<Integer>

问题 I made a simple application to send e-mails using Java API and have a question: Is there any way to find out the SMTP host knowing the e-mail address of the one who will login to send an e-mail? And also the port? For example, if the sender's e-mail address is sender@gmail.com, the SMTP host is smtp.gmail.com and the port 465. If the sender's e-mail address is sender@yahoo.com, the SMTP host is smtp.yahoomail.com and the port 25. Supposing I don't know this, is there any way to find this

问题 I have different types of pdf which contain multiple things like text, table etc. The table may exist any place of pdf(top, middle, bottom). I want to extract only table data(No. of the column, no. of rows & data in a table) from that pdf using java without passing location. What I have done till yet:- 1. I have used iText java API to read and extract. Following code used:- PdfTextExtractor.getTextFromPage but It is only returning data in form of text. Didn't get any clue to identify where

问题 I am trying to implement inner hits with elasticsearch using Java API, but I cannot find much of any documentation on it or examples that other people are using. I have my JSON search that works as follows: { "query": { "filtered": { "query": { "match_all": {} }, "filter": { "nested": { "path": "locations", "filter": { "geo_distance": { "distance": "20km", "locations.address.geoLocation": { "lat": 38.07061, "lon": -76.77514 } } }, "inner_hits": {} } } } } } I see an InnerHitsBuilder and

问题 I am trying to stream large content (say 200 MB) of formatted data to PDF with minimal memory footprint (say 20 MB per Client/Thread). The PDF structure is written in Adobe postscript and it is complex to directly write in PDF postscript format. I have been using the following APIs to stream content to PDF. Jasper Reports iText The problem I am facing with Jasper reports is that it needs all the input data to be taken into in-memory and only supports OutputStream. There is a function

问题 I use the Scanner class for reading multiple similar files. I would like to extend it to make sure they all use the same delimiter and I can also add methods like skipUntilYouFind(String thisHere) that all valid for them all. I can make a utility-class that contain them, or embed the Scanner Class as a variable inside another class but this is more cumbersome. I have found some reasons to declare a class final, but why is it done here? 回答1: Probably because extending it and overwriting some

问题 I am new to ELastic Search. Data in Elastic search is in Parent-Child Model.I want to perform search in this data using java api. parent type contains author details and child type contains book details like book name,book publisher, book category. While performing a search on child details,I need to get the parent details also and vice versa. Sometimes search conditions will be on parent type as well as child. eg search for books written by author1 and type Fiction . How can i implement this