Elasticsearch 5.0下Java API使用指南

原文地址：http://blog.csdn.net/gaoqiao1988/article/details/53862813

一.2.X到5.X

Elasticsearch 2.x使用Java api把elasticsearch安装包下的lib文件夹下的jar文件全部加入到工程类路径即可,换到5.x就不适用了.创建Clien的代码:

Settings settings = Settings.builder().put("cluster.name", "elasticsearch").build();TransportClient client = new PreBuiltTransportClient(settings)                    .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("127.0.0.1"), 9300));
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只使用安装包下的jar文件会出现PreBuiltTransportClient cannot be resolved to a type的错误,原因是缺少jar包.下面记录一下如何在5.X中使用Java api

二.创建maven工程

2.1Eclipse中新建maven工程

打开eclipse,file->other->maven project: 
 
创建group id(相当于工程名)和artifact id(相当于包名): 

2.2在pom.xml中添加以下依赖

<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>2.6.2</version>        </dependency>        <dependency>            <groupId>org.apache.logging.log4j</groupId>            <artifactId>log4j-core</artifactId>            <version>2.6.2</version>        </dependency>    </dependencies>
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添加依赖后maven会自动导包,如下图所示: 

至此所有的jar包都导入完成了

三.配置log4j2

在src/main/resources文件夹下新建文件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
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四.创建Client并搜索数据

首先启动elasticsearch,我这里使用的是5.1.1,创建一个新的索引:

 curl -XPUT "http://localhost:9200/blog"
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添加一条文档

 curl -XPUT "http://localhost:9200/blog/article/1" -d '{                "title":"test",    "content":"test content"    }'
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在 src/main/Java/目录下新建TestEsClient.java,内容如下:

    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 {                //设置集群名称                Settings settings = Settings.builder().put("cluster.name", "elasticsearch").build();                //创建client                TransportClient client = new PreBuiltTransportClient(settings)                        .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("127.0.0.1"), 9300));                //搜索数据                GetResponse response = client.prepareGet("blog", "article", "1").execute().actionGet();                //输出结果                System.out.println(response.getSourceAsString());                //关闭client                client.close();            } catch (Exception e) {                e.printStackTrace();            }        }    }
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运行结果:

    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"}
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工程目录以及运行结果的截图如下: 

五.参考资料

参考资料主要为官网文档:

Maven Repository 
Log4j 2 Logger