Elastisearch是一個很強大,易用的搜索引擎
在系統上運行Elastisearch只需以下幾步
1.下載Elastisearch
復制代碼 代碼如下:
wget https://artifacts.elastic.co/downloads/elasticsearch/elasticsearch-5.4.0.zip
2.解壓
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unzip elasticsearch-5.4.0.zip |
3.運行
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elasticsearch-5.4.0/bin/elasticsearch |
這時有可能會直接被Killed掉，因為內存溢出（OOM），elastisearch占用的內存非常大，所以在內存比較小的服務器上運行要先修改jvm的內存大小
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vi elasticsearch-5.4.0/config/jvm.options |
將22和23行的棧堆大小改為512M
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-Xms512M-Xmx512M |
如果重新啟動后還是killed就再改小一點
4.測試是否成功
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curl 'http://localhost:9200/?pretty' |
你能看到以下返回信息:
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{ "status": 200, "name": "Shrunken Bones", "version": { "number": "1.4.0", "lucene_version": "4.10" }, "tagline": "You Know, for Search"} |
則表明啟動成功
接下來我們用Java的API來操作Elasticsearch
首先是導入elastisearch和log4j的包
POM
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<?xml version="1.0" encoding="UTF-8"?><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.jk</groupId> <artifactId>ElasticsearchExample</artifactId> <version>1.0-SNAPSHOT</version> <dependencies> <dependency> <groupId>org.elasticsearch.client</groupId> <artifactId>transport</artifactId> <!--用哪個版本就填什么--> <version>5.4.0</version> </dependency> <dependency> <groupId>org.apache.logging.log4j</groupId> <artifactId>log4j-api</artifactId> <version>2.7</version> </dependency> </dependencies></project> |
以下是常用的幾種操作
1.創建client
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Client client = null; try { client = new PreBuiltTransportClient(Settings.EMPTY) .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("localhost"), 9300)); } catch (Exception e) { e.printStackTrace(); } |
2.創建索引
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/** * 創建索引，有則先刪除 * @param client */ private static void recreateIndex(Client client) { if (client.admin().indices().prepareExists(index).execute().actionGet() .isExists()) { DeleteIndexResponse deleteIndexResponse = client.admin().indices() .delete(new DeleteIndexRequest(index)).actionGet(); System.out.println("delete index :"); System.out.println(deleteIndexResponse); } CreateIndexResponse createIndexResponse = client.admin().indices() .prepareCreate(index).execute().actionGet(); System.out.println("create index :"); System.out.println(createIndexResponse); } |
3.插入數據
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/** * 插入數據 * @param client */ @SuppressWarnings({"rawtypes", "unchecked"}) private static void doIndex(final Client client) { Map s11 = new LinkedHashMap(); s11.put("title", "Think in java"); s11.put("origin", "美國"); s11.put("description", "初級java開發人員必讀的書"); s11.put("author", "Bruce Eckel"); s11.put("price", 108); Map s12 = new LinkedHashMap(); s12.put("title", "Head First Java"); s12.put("origin", "英國"); s12.put("description", "java入門教材"); s12.put("author", "Kathy Sierra"); s12.put("price", 54); Map s21 = new LinkedHashMap(); s21.put("title", "Design Pattern"); s21.put("origin", "法國"); s21.put("description", "程序員不得不讀的設計模式"); s21.put("author", "Kathy Sierra"); s21.put("price", 89); Map s22 = new LinkedHashMap(); s22.put("title", "黑客與畫家"); s22.put("origin", "法國"); s22.put("description", "讀完之后腦洞大開"); s22.put("author", "Paul Graham"); s22.put("price", 35); BulkResponse bulkResponse = client .prepareBulk() .add(client.prepareIndex(index, type).setId("11").setSource(s11).setOpType(IndexRequest.OpType.INDEX).request()) .add(client.prepareIndex(index, type).setId("12").setSource(s12).setOpType(IndexRequest.OpType.INDEX).request()) .add(client.prepareIndex(index, type).setId("21").setSource(s21).setOpType(IndexRequest.OpType.INDEX).request()) .add(client.prepareIndex(index, type).setId("22").setSource(s22).setOpType(IndexRequest.OpType.INDEX).request()) .execute().actionGet(); if (bulkResponse.hasFailures()) { System.err.println("index docs ERROR:" + bulkResponse.buildFailureMessage()); } else { System.out.println("index docs SUCCESS:"); System.out.println(bulkResponse); } } |
4.查詢所有
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/** * 查詢所有 */private static void searchAll(Client client) { SearchResponse response = client.prepareSearch(index) .setQuery(QueryBuilders.matchAllQuery()) .setExplain(true).execute().actionGet(); System.out.println("searchAll : "); for (SearchHit searchHit : response.getHits()) { System.out.println("********"); System.out.println(searchHit.getSource()); }} |
5.關鍵詞查詢
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/** * 關鍵詞查詢 * * @param client */ private static void searchKeyWord(Client client) { SearchResponse response = client.prepareSearch(index) //查詢所有字段匹配關鍵字 .setQuery(QueryBuilders.matchQuery("_all", "法國")) //設置最小匹配程度// .setQuery(QueryBuilders.matchQuery("_all", "法國").minimumShouldMatch("100%")) .execute().actionGet(); System.out.println("searchKeyWord : "); System.out.println(response); } |
6.數值范圍過濾
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/** * 數值范圍過濾 * * @param client */private static void searchRange(Client client) { SearchResponse response = client.prepareSearch(index). //大于80，小于100 setQuery(QueryBuilders.rangeQuery("price").gt(80).lt(100)) .execute() .actionGet(); System.out.println("searchRange : "); System.out.println(response);} |
7.排序
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/** * 排序 * * @param client */private static void searchOrdered(Client client) { SearchResponse response = client.prepareSearch(index) .setQuery(QueryBuilders.matchAllQuery()) //根據價格降序排序 .addSort(SortBuilders.fieldSort("price") .order(SortOrder.DESC)).execute().actionGet(); System.out.println("searchOrdered : "); System.out.println(response);} |
8.高亮關鍵字
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/** * 高亮關鍵字 * @param client */ private static void searchHightlight(Client client) { //高亮多個字段 HighlightBuilder highlightBuilder = new HighlightBuilder(); highlightBuilder.field("title"); highlightBuilder.field("description"); SearchResponse response = client.prepareSearch(index) //單條件匹配，高亮時只能高亮該字段// .setQuery(QueryBuilders.matchQuery("title", "java")) //多條件匹配，高亮時只能高亮多個字段 .setQuery(QueryBuilders.multiMatchQuery("開發人員必讀", "title", "description")) .highlighter(highlightBuilder) .execute() .actionGet(); System.out.println("searchHightlight : "); System.out.println(response); } |
9.根據id查找
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/** * 根據id查找 * @param client */ private static void findById(final Client client) { String id="12"; GetResponse response = client.prepareGet(index, type, id).get(); System.out.println("findById"); System.out.println(response); } |
10.刪除
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/** * 刪除 * @param client */private static void deleteById(Client client) { String id="12"; DeleteResponse response = client.prepareDelete(index, type, id).get();} |
11.更新
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/** * 更新 * @param client */private static void updateById(Client client) { try { String id="11"; client.prepareUpdate(index, type, id) .setDoc(jsonBuilder() .startObject() .field("title", "白鹿原") .endObject()) .get(); } catch (IOException e) { e.printStackTrace(); }} |
常用的操作就這些,代碼上傳到https://github.com/jkgeekJack/ElasticsearchExample
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：http://www.jianshu.com/p/46c38f352c27
