Java-based ES development

3.1 Environment Configuration

JDK 1.8 and above

Elasticsearch.client 5.5.2 (consistent with server version)

LOG4J 2.7 and below

MAVEN project The necessary jar package dependencies

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi= "http://www.w3.org/2001/ Xmlschema-instance " xsi:schemalocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.rodge</groupId> <artifactId>elasticFirstDemo</artifactId> <version>0.0.1-SNAPSHOT</version> <properties> <elasticSearch.version>5.5.2</elasticSearch.version> </properties> <dependencies> <!--Https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core-- <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-core</artifactId> <version>2.7</version> </dependency> <!--Https://mvnrepository.com/artifact/org.elasticsearch/elasticsearch-- <dependency> <groupId>org.elasticsearch.client</groupId> <artifactId>transport</artifactId> <version>${elasticSearch.version}</version> </dependency> </dependencies> </project>

Log file Log4j2.properties file contents

Appender.console.type = Console Appender.console.name = Console Appender.console.layout.type = Patternlayout Appender.console.layout.pattern = [%t]%-5p%c-%m%n Rootlogger.level = info RootLogger.appenderRef.console.ref = Console

3.2 Simple Query

Test cases, querying documents with ID 1 in novel in the book Index

Package Com.rodge.elasticSearch.firstDemo; Import java.net.InetAddress; Import java.net.UnknownHostException; Import Org.elasticsearch.action.get.GetResponse; Import org.elasticsearch.client.transport.TransportClient; Import org.elasticsearch.common.settings.Settings; Import org.elasticsearch.common.transport.InetSocketTransportAddress; Import org.elasticsearch.transport.client.PreBuiltTransportClient; Import Org.junit.Test; public class Esfirstdemo { @SuppressWarnings ("Unchecked") Public Transportclient Client () throws Unknownhostexception { ES address, the address is 192.168.253.129 (here the address cannot be added "/http"), where the port is ES TCP port is 9300, Instead of the previous http9200 port, if ES has more than one node, you can create multiple nodes and then add in the client Note that the port number here is not 9200, but 9300. The 9200 port is used to make HTTP REST API to access Elasticsearch, while Port 9300 is the default port on which the transport layer listens. inetsockettransportaddress node = new Inetsockettransportaddress ( Inetaddress.getbyname ("192.168.253.129"), 9300); The Configuration class for ES Settings Settings = Settings.builder (). Put ("Cluster.name", "Wali"). Build (); Transportclient is the core class of ES launcher, and the subsequent development of ES is centered around the transportclient. Transportclient client = new prebuilttransportclient (settings); Client.addtransportaddress (node); return client; } @Test public void Get () throws Unknownhostexception { GetResponse result = Client (). Prepareget ("book", "Novel", "1"). get (); System.out.println (Result.getsource (). toString ()); } }

3.3 Insert 3.3.1 Specify ID Insert

Add document, specify ID to insert @Test Public void Addwithid () throws IOException { String title = "One Yang finger"; String author = "Wang Chongyang"; int wordCount = 5000; Date publishdate = new date (); SimpleDateFormat DateFormat = new simpledateformat ("Yyyy-mm-dd HH:mm:ss"); String format = Dateformat.format (publishdate); Constructing es documents Constructed using the es -brought JSON tool Xcontentbuilder Xcontentbuilder = xcontentfactory. Jsonbuilder (). StartObject () . Field ("title", title). Field ("Author", author). field ("Word_count", WordCount) . Field ("Publish_date", format). EndObject (); Inserts the data into index as book, type is novel, and the specified ID is 15 Indexresponse indexresponse = Client (). Prepareindex ("book", "novel"). SetId ("15") . SetSource (Xcontentbuilder). get (); System. out. println (Indexresponse.getid ()); }

3.3.2 ES randomly generated ID inserted

Add a document with ID es randomly generated @Test Public void Add () throws IOException { String title = "Luoying Sword"; String author = "Yellow Pharmacist"; int wordCount = 3000; Date publishdate = new date (); SimpleDateFormat DateFormat = new simpledateformat ("Yyyy-mm-dd HH:mm:ss"); String format = Dateformat.format (publishdate); Constructing es documents Constructed using the es -brought JSON tool Xcontentbuilder Xcontentbuilder = xcontentfactory. Jsonbuilder (). StartObject () . Field ("title", title). Field ("Author", author). field ("Word_count", WordCount) . Field ("Publish_date", format). EndObject (); Inserts the data into index as book, type is in novel, ID has es randomly generated, and gets return information Indexresponse indexresponse = Client (). Prepareindex ("book", "novel") . SetSource (Xcontentbuilder). get (); System. out. println (Indexresponse.tostring ()); }

3.3.4 BULK Insert

@Test Public void dbimportes () { Long count = 10000l;//per acquisition bar String index = "Rodge";// es index name String type = "user";//type name in es Bulkrequestbuilder preparebulk = transportclient. Preparebulk (); long startTime = System. Currenttimemillis (); System. out. println ("StartTime:" + startTime); for (int i = 1; I <= count; i++) { map<string, object> ret = new hashmap<string, object> (); Ret.put ("Recordtime", System. Currenttimemillis()); Ret.put ("area", "Beijing" + i); Ret.put ("usertype", + i); Ret.put ("Count", I); Preparebulk.add (transportclient. Prepareindex (index, type). SetSource (ret)); Every 10,000 articles submitted once if (i% 1000 = = 0) { Bulkresponse actionget = Preparebulk.execute (). Actionget (); System. out. println (Actionget.tostring ()); long endTime = System. Currenttimemillis (); System. out. println ("EndTime:" + endTime); System. out. println ("Time Consumed:" + (Endtime-starttime)/1000); } } }

3.4 Delete 3.4.1 Delete the document with the specified ID

Delete--delete the document with the specified ID @Test Public void Deletebyid () throws unknownhostexception { Deleteresponse deleteresponse = Client () . Preparedelete ("book", "novel", "Av8abznyhgrpjnhorylk"). get (); System. out. println (Deleteresponse.getversion ()); }

3.4.2 Deleting an index

Delete index is irreversible, use with caution!

Delete--delete index @Test Public void Deleteindex () throws unknownhostexception { Deleteindexresponse deleteindexresponse = Client (). Admin (). Indices (). Preparedelete ("People") . get (); System. out. println (Deleteindexresponse.tostring ()); }

3.5 Modify 3.5.1 Update the specified document by ID

Update--update documents based on ID @Test Public void Updatebyid () throws IOException, Interruptedexception, executionexception { Updaterequest updaterequest = new updaterequest ("book", "Novel", "1"); Xcontentbuilder Contentbuilder = xcontentfactory. Jsonbuilder (). StartObject (); Contentbuilder.field ("Author", "Zhang San _update"); Contentbuilder.field ("title", "Moving Soul Dafa _update"); Contentbuilder.field ("Word_count", 200); Contentbuilder.field ("Publish_date", "2017-10-16"); Contentbuilder.endobject (); Updaterequest.doc (Contentbuilder); Updateresponse updateresponse = Client (). Update (Updaterequest). get (); System. out. println (Updateresponse.tostring ()); }

3.6 Complex Query Interface development

Compound query @Test Public void complexquery () throws unknownhostexception { Match query Boolquerybuilder Boolquerybuilder = querybuilders. Boolquery (); Boolquerybuilder.must (querybuilders. Matchquery("Author", "Watt Force")); Boolquerybuilder.must (querybuilders. Matchquery("title", "Elasticsearch Proficiency")); Boolquerybuilder.must (Querybuilders.matchquery ("Publish_date", "")); Scope Query Rangequerybuilder Rangequerybuilder = querybuilders. Rangequery ("Word_count"); Rangequerybuilder.from (200); Rangequerybuilder.to (3000); Boolquerybuilder.filter (Rangequerybuilder); Searchrequestbuilder requestbuilder = Client (). Preparesearch ("book"). Settypes ("novel") . Setsearchtype (SearchType. Dfs_query_then_fetch) . Setquery (Boolquerybuilder) . Setfrom (0) . SetSize (10); System. out. println ("Requestbuilder" + requestbuilder); SearchResponse SearchResponse = Requestbuilder.get (); list<map<string, object>> resultlist = new arraylist<map<string,object>> (); for (Searchhit hit:searchResponse.getHits ()) { Resultlist.add (Hit.getsource ()); } System. out. println ("resultlist:" + resultlist); }

Java-based ES development