使用Logstash同步數據至Elasticsearch，Spring Boot中集成Elasticsearch實現搜索

安裝logstash、同步數據至ElasticSearch

爲何使用logstash來同步，CSDN上有一篇文章簡要的分析瞭如下幾種同步工具的優缺點：https://blog.csdn.net/laoyang360/article/details/51694519。

下面開始實踐：

　　1. 下載Logstash 安裝包，須要注意版本與elasticsearch保持一致，windows系統下直接解壓便可。

　　2.添加同步mysql數據庫的配置，並將mysql鏈接驅動jar包放在指定的配置目錄

　　　　注： 目前版本的logstash已經集成了logstash-jdbc-input，不須要再配置這個插件,

　　　　　　 配置文件須要UTF-8編碼，我在配置過程當中開始新建文件默認的是GBK編碼，後面啓動logstash後讀取配置文件報編碼錯誤了。

個人配置目錄：

配置文件mysql.conf

 1 input {
 2     stdin {
 3     }
 4     jdbc {
 5       # mysql數據庫鏈接
 6       jdbc_connection_string => "jdbc:mysql://localhost/blog?characterEncoding=utf-8&useSSL=false&serverTimezone=UTC"
 7       # mysqly用戶名和密碼
 8       jdbc_user => "root"
 9       jdbc_password => "123456"
10       # 驅動配置
11       jdbc_driver_library => "C:/logstash-6.4.0/mysqletc/mysql-connector-java-6.0.5.jar"
12       # 驅動類名
13       jdbc_driver_class => "com.mysql.cj.jdbc.Driver"
14       jdbc_paging_enabled => "true"
15       jdbc_page_size => "50000"
16       # 執行指定的sql文件
17       statement_filepath => "C:/logstash-6.4.0/mysqletc/blog.sql"
18       # 設置監聽 各字段含義 分 時 天 月  年 ，默認所有爲*表明含義：每分鐘都更新
19       schedule => "* * * * *"
20       # 索引類型
21       type => "blog"
22     }
23 }
24  
25 filter {
26     json {
27         source => "message"
28         remove_field => ["message"]
29     }
30 }
31  
32 output {
33 
34     elasticsearch {
35         #es服務器
36         hosts => ["localhost:9200"]
37         #ES索引名稱
38         index => "sl_blog"
39         #自增ID
40         document_id => "%{id}"
41     }
42     
43 
44     stdout {
45         codec => json_lines
46     }
47 }

Blog.sql文件：

SELECT * FROM blog

若是須要同步多個mysql表，能夠修改output配置文件mysql.conf，在input和output中添加其餘的表。

       3. 啓動logstash，正常的話將會同步數據值elasticsearch，根據上面的配置logstash每分鐘去數據庫讀取最新數據

  logstash -f ../mysqletc/mysql.conf

Elasticseach-head插件中查看：

SpringBoot中集成Elasticsearch

下面以開源博客系統new-star-blog（https://github.com/waylau/new-star-blog）爲例，簡單實現這個功能。

環境：Springboot 2.0.4 +ES 6.4.0

　　1. 添加Spring DataElastic依賴：

<!--SpringBoot默認使用SpringData ElasticSearch模塊進行操做-->
<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
</dependency>

Spring Data Elastic是Spring官方提供的訪問Elasticsearch的方式，相對於直接REST訪問，它有提供了完善的封裝，Spring Data Elastic遵循Spring Data規範。另外它屏蔽了Elasticsearch REST接口的複雜性，由Spring內部實現對Elastic 接口的封裝。

　　2. 添加Elasticsearch服務器配置：

#開啓 Elasticsearch 倉庫(默認值:true)
spring.data.elasticsearch.repositories.enabled=true
#默認 9300 是 Java 客戶端的端口。9200 是支持 Restful HTTP 的接口
spring.data.elasticsearch.cluster-nodes = 127.0.0.1:9300
# ES設置鏈接超時時間
#spring.data.elasticsearch.properties.transport.tcp.connect_timeout=120s

　　3. 實現代碼：

  1 package com.sl.blog.domain;
  2 import org.springframework.data.elasticsearch.annotations.Document;
  3 import org.springframework.data.annotation.Id;
  4 import java.io.Serializable;
  5 import java.util.Date;
  6 //映射Elasticsearch中的索引和文檔類型
  7 @Document(indexName = "sl_blog", type = "blog")
  8 public class EsBlog implements Serializable {
  9 
 10     private static final long serialVersionUID = 1L;
 11     @Id  // 主鍵
 12     private String id;
 13 
 14     private String title;
 15 
 16     //@Field(index = false)
 17     private Date create_time;
 18 
 19     //@Field(index = false,type = FieldType.Long)
 20     private  Long user_id;
 21 
 22     private String tags;
 23 
 24     //@Field(index = false,type = FieldType.Long)
 25     private Long read_size;
 26 
 27 
 28     private Long catalog_id;
 29 
 30     private String summary;
 31 
 32     //@Field(index = false,type = FieldType.Long)
 33     private Long comment_size;
 34 
 35     //@Field(index = false,type = FieldType.Long)
 36     private Long like_size;
 37 
 38     private String content;
 39 
 40     private String username;
 41 
 42     protected EsBlog() {
 43     }
 44 
 45     public String getId() {
 46         return id;
 47     }
 48 
 49     public void setId(String id) {
 50         this.id = id;
 51     }
 52 
 53     public String getTitle() {
 54         return title;
 55     }
 56 
 57     public void setTitle(String title) {
 58         this.title = title;
 59     }
 60 
 61 
 62     public Date getCreate_time() {
 63         return create_time;
 64     }
 65 
 66     public void setCreate_time(Date create_time) {
 67         this.create_time = create_time;
 68     }
 69 
 70     public Long getUser_id() {
 71         return user_id;
 72     }
 73 
 74     public void setUser_id(Long user_id) {
 75         this.user_id = user_id;
 76     }
 77 
 78     public String getTags() {
 79         return tags;
 80     }
 81 
 82     public void setTags(String tags) {
 83         this.tags = tags;
 84     }
 85 
 86     public Long getRead_size() {
 87         return read_size;
 88     }
 89 
 90     public void setRead_size(Long read_size) {
 91         this.read_size = read_size;
 92     }
 93 
 94 
 95     public Long getCatalog_id() {
 96         return catalog_id;
 97     }
 98 
 99     public void setCatalog_id(Long catalog_id) {
100         this.catalog_id = catalog_id;
101     }
102 
103     public String getSummary() {
104         return summary;
105     }
106 
107     public void setSummary(String summary) {
108         this.summary = summary;
109     }
110 
111     public Long getComment_size() {
112         return comment_size;
113     }
114 
115     public void setComment_size(Long comment_size) {
116         this.comment_size = comment_size;
117     }
118 
119     public Long getLike_size() {
120         return like_size;
121     }
122 
123     public void setLike_size(Long like_size) {
124         this.like_size = like_size;
125     }
126 
127     public String getContent() {
128         return content;
129     }
130 
131     public void setContent(String content) {
132         this.content = content;
133     }
134 
135     public String getUsername() {
136         return username;
137     }
138 
139     public void setUsername(String username) {
140         this.username = username;
141     }
142 
143 }

View Code

 1 package com.sl.blog.repository;
 2 
 3 import com.sl.blog.domain.EsBlog;
 4 import org.springframework.data.domain.Page;
 5 import org.springframework.data.domain.Pageable;
 6 import org.springframework.data.elasticsearch.repository.ElasticsearchCrudRepository;
 7 import org.springframework.stereotype.Component;
 8 
 9 @Component
10 public interface IEsBlogRepository extends ElasticsearchCrudRepository<EsBlog,String> {
11 
12     Page<EsBlog> findDistinctEsBlogByTitleContainingOrSummaryContainingOrContentContainingOrTagsContaining(String title, String Summary, String content, String tags, Pageable pageable);
13     
14 }

View Code

 1 package com.sl.blog.service;
 2 
 3 import com.sl.blog.domain.EsBlog;
 4 import org.springframework.data.domain.Page;
 5 import org.springframework.data.domain.Pageable;
 6 
 7 public interface IEsBlogService {
 8 
 9     Page<EsBlog> getEsBlogByKeys(String keyword, Pageable pageable);
10 }

View Code

 1 package com.sl.blog.service.impl;
 2 
 3 import com.sl.blog.domain.EsBlog;
 4 import com.sl.blog.repository.IEsBlogRepository;
 5 import com.sl.blog.service.IEsBlogService;
 6 import joptsimple.internal.Strings;
 7 import org.elasticsearch.index.query.BoolQueryBuilder;
 8 import org.elasticsearch.index.query.QueryBuilders;
 9 import org.springframework.beans.factory.annotation.Autowired;
10 import org.springframework.data.domain.Page;
11 import org.springframework.data.domain.PageRequest;
12 import org.springframework.data.domain.Pageable;
13 import org.springframework.data.domain.Sort;
14 import org.springframework.data.elasticsearch.core.ElasticsearchTemplate;
15 import org.springframework.data.elasticsearch.core.query.NativeSearchQuery;
16 import org.springframework.data.elasticsearch.core.query.NativeSearchQueryBuilder;
17 import org.springframework.stereotype.Service;
18 
19 @Service
20 public class EsBlogServiceImpl implements IEsBlogService {
21 
22 
23     @Autowired
24     private ElasticsearchTemplate elasticsearchTemplate;
25 
26     @Autowired
27     private IEsBlogRepository esBlogRepository;
28 
29     /**
30      * 經過關鍵字搜索
31      * @param keyword
32      * @param pageable
33      * @return
34      */
35     @Override
36     public Page<EsBlog> getEsBlogByKeys(String keyword, Pageable pageable){
37         Sort sort = new Sort(Sort.Direction.DESC,"read_size","comment_size","like_size");
38         if (pageable.getSort() == null) {
39             pageable = new PageRequest(pageable.getPageNumber(), pageable.getPageSize(), sort);
40         }
41         if(Strings.isNullOrEmpty(keyword)){
42            return esBlogRepository.findAll(pageable);
43         }
44         //keyword 含有空格時拋異常
45         //return esBlogRepository.findDistinctEsBlogByTitleContainingOrSummaryContainingOrContentContainingOrTagsContaining(keyword, keyword, keyword, keyword, pageable);
46 
47         //使用 Elasticsearch API QueryBuilder
48         NativeSearchQueryBuilder aNativeSearchQueryBuilder = new NativeSearchQueryBuilder();
49         aNativeSearchQueryBuilder.withIndices("sl_blog").withTypes("blog");
50         final BoolQueryBuilder aQuery = new BoolQueryBuilder();
51         //builder下有的must、should、mustNot 至關於邏輯運算and、or、not
52         aQuery.should(QueryBuilders.queryStringQuery(keyword).defaultField("title"));
53         aQuery.should(QueryBuilders.queryStringQuery(keyword).defaultField("summary"));
54         aQuery.should(QueryBuilders.queryStringQuery(keyword).defaultField("tags"));
55         aQuery.should(QueryBuilders.queryStringQuery(keyword).defaultField("content"));
56 
57         NativeSearchQuery nativeSearchQuery = aNativeSearchQueryBuilder.withQuery(aQuery).build();
58         Page<EsBlog> plist = elasticsearchTemplate.queryForPage(nativeSearchQuery,EsBlog.class);
59         return  plist;
60 
61     }
62 
63 }

View Code

 1 @Controller
 2 @RequestMapping("/blogs")
 3 public class BlogController {
 4 
 5     @Autowired
 6     private IEsBlogService esBlogService;
 7 
 8     @GetMapping
 9     public String listBlogs(@RequestParam(value="order",required=false,defaultValue="new") String order,
10                             @RequestParam(value="keyword",required=false,defaultValue="" ) String keyword,
11                             @RequestParam(value="async",required=false) boolean async,
12                             @RequestParam(value="pageIndex",required=false,defaultValue="0") int pageIndex,
13                             @RequestParam(value="pageSize",required=false,defaultValue="5") int pageSize,
14                             Model model) {
15         Pageable pageable = new PageRequest(pageIndex,pageSize);
16         Page<EsBlog> page = esBlogService.getEsBlogByKeys(keyword,pageable);
17         List<EsBlog> list  = page.getContent();
18         model.addAttribute("order", order);
19         model.addAttribute("keyword", keyword);
20         model.addAttribute("page", page);
21         model.addAttribute("blogList", list);
22         return (async==true?"/index :: #mainContainerRepleace":"/index");
23     }
24 }

View Code

演示效果：