Elasticsearch 5.0下Java API使用指南

一.2.X到5.X

Elasticsearch 2.x使用java api把elasticsearch安裝包下的lib資料夾下的jar檔案全部加入到工程類路徑即可,換到5.x就不適用了.建立Clien的程式碼:

Settings settings = Settings.builder().put("cluster.name", "elasticsearch").build();

TransportClient client = new PreBuiltTransportClient(settings)
                    .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("127.0.0.1"), 9300));
 

只使用安裝包下的jar檔案會出現PreBuiltTransportClient cannot be resolved to a type的錯誤,原因是缺少jar包.下面記錄一下如何在5.X中使用java api

二.建立maven工程

2.1Eclipse中新建maven工程

開啟eclipse,file->other->maven project: 
 
建立group id(相當於工程名)和artifact id(相當於包名): 

2.2在pom.xml中新增以下依賴

<dependencies>
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>transport</artifactId>
            <version>5.1.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.7</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId>
            <version>2.7</version>
        </dependency>
    </dependencies>
 

新增依賴後maven會自動導包,如下圖所示: 
 
至此所有的jar包都匯入完成了。 
所有的jar包列表如下，如果出現導包錯誤一定檢視一下jar包是否下載完整：

HdrHistogram-2.1.6.jar
commons-codec-1.10.jar
commons-logging-1.1.3.jar
compiler-0.9.3.jar
elasticsearch-5.1.1.jar
hppc-0.7.1.jar
httpasyncclient-4.1.2.jar
httpclient-4.5.2.jar
httpcore-4.4.5.jar
httpcore-nio-4.4.5.jar
jackson-core-2.8.1.jar
jackson-dataformat-cbor-2.8.1.jar
jackson-dataformat-smile-2.8.1.jar
jackson-dataformat-yaml-2.8.1.jar
jna-4.2.2.jar
joda-time-2.9.5.jar
jopt-simple-5.0.2.jar
lang-mustache-client-5.1.1.jar
log4j-api-2.7.jar
log4j-core-2.7.jar
lucene-analyzers-common-6.3.0.jar
lucene-backward-codecs-6.3.0.jar
lucene-core-6.3.0.jar
lucene-grouping-6.3.0.jar
lucene-highlighter-6.3.0.jar
lucene-join-6.3.0.jar
lucene-memory-6.3.0.jar
lucene-misc-6.3.0.jar
lucene-queries-6.3.0.jar
lucene-queryparser-6.3.0.jar
lucene-sandbox-6.3.0.jar
lucene-spatial-6.3.0.jar
lucene-spatial-extras-6.3.0.jar
lucene-spatial3d-6.3.0.jar
lucene-suggest-6.3.0.jar
netty-3.10.6.Final.jar
netty-buffer-4.1.6.Final.jar
netty-codec-4.1.6.Final.jar
netty-codec-http-4.1.6.Final.jar
netty-common-4.1.6.Final.jar
netty-handler-4.1.6.Final.jar
netty-resolver-4.1.6.Final.jar
netty-transport-4.1.6.Final.jar
percolator-client-5.1.1.jar
reindex-client-5.1.1.jar
rest-5.1.1.jar
securesm-1.1.jar
snakeyaml-1.15.jar
t-digest-3.0.jar
transport-5.1.1.jar
transport-netty3-client-5.1.1.jar
transport-netty4-client-5.1.1.jar
 

三.配置log4j2

在src/main/resources資料夾下新建檔案log4j2.properties,加入以下log4 
j2的配置:

    appender.console.type = Console
    appender.console.name = console
    appender.console.layout.type = PatternLayout

    rootLogger.level = info
    rootLogger.appenderRef.console.ref = console

四.建立Client並搜尋資料

首先啟動elasticsearch,我這裡使用的是5.1.1,建立一個新的索引:

 curl -XPUT "http://localhost:9200/blog"

新增一條文件

 curl -XPUT "http://localhost:9200/blog/article/1" -d '{            
    "title":"test",
    "content":"test content"
    }'

在 src/main/java/目錄下新建TestEsClient.java,內容如下:

    import java.net.InetAddress;
    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;

    public class TestEsClient {

        public static void main(String[] args) {

            try {

                //設定叢集名稱
                Settings settings = Settings.builder().put("cluster.name", "elasticsearch").build();
                //建立client
                TransportClient client = new PreBuiltTransportClient(settings)
                        .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("127.0.0.1"), 9300));
                //搜尋資料
                GetResponse response = client.prepareGet("blog", "article", "1").execute().actionGet();
                //輸出結果
                System.out.println(response.getSourceAsString());
                //關閉client
                client.close();

            } catch (Exception e) {
                e.printStackTrace();
            }

        }

    }

執行結果:

    no modules loaded
    loaded plugin [org.elasticsearch.index.reindex.ReindexPlugin]
    loaded plugin [org.elasticsearch.percolator.PercolatorPlugin]
    loaded plugin [org.elasticsearch.script.mustache.MustachePlugin]
    loaded plugin [org.elasticsearch.transport.Netty3Plugin]
    loaded plugin [org.elasticsearch.transport.Netty4Plugin]
    { "title":"test","content":"test content"}

工程目錄以及執行結果的截圖如下: 

五.參考資料

參考資料主要為官網文件:

六、程式碼下載