Spring Boot and Retrieval / ElasticSearch

 

A retrieval

 

 

 

Second, the concept

 

 

 

 

 

 

 

 

 

 

 

 

Third, integration testing ElasticSearch

• 引入spring-boot-starter-data-elasticsearch

• Install Spring Data corresponding version of ElasticSearch

elasticsearch installation:

[root@localhost docker]# docker pull elasticsearch
这种方式下载一般会很慢,或者直接卡死,我们可以使用阿里云的镜像加速服务您可以通过修改 daemon配置文件 /etc/docker/daemon.json 来使用加速器

1 sudo mkdir -p /etc/docker
2 sudo tee /etc/docker/daemon.json <<-'EOF'
3 {
4   "registry-mirrors": ["https:aliyuncs.com"]
5 }
6 EOF
7 sudo systemctl daemon-reload
8 sudo systemctl restart docker

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ES mirrored run

[root@localhost ~]# docker run -d -e ES_JAVA_OPTS="-Xms256m -Xmx256m" -d -p 9200:9200 -p 9300:9300 --name ES1 c71178df2dd5

-e ES_JAVA_OPTS = "- Xms256m -Xmx256m"
because elasticsearch is the realization of java, the default initial size of the heap memory will be 2G, the virtual machine is insufficient memory error, then will start, so we limit the size of the heap memory by adding a parameter -e .- Xms is the initial heap size, the maximum heap memory -Xmx is used.
using default port 9200 for web communication the case of a distributed, hungry elasticsearch communication between respective nodes need to use port 9300, so we need to do two port mapping. 

After a successful start, can be accessed in the browser:

 

 

 

 

 

• application.yml arrangement

• Spring Boot automatically configured ElasticsearchRepository, ElasticsearchTemplate, Jest

• Test ElasticSearch

Use springdata integrated ES

Import dependence

1  <!--spring boot 默认使用的是springdata进行操作ES-->
2         <dependency>
3             <groupId>org.springframework.boot</groupId>
4             <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
5         </dependency>

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Configuration node name and node communication port

Spring: 
   Data: 
    elasticsearch: 
      Cluster - name: the name of the node # elasticsearch 
      Cluster -nodes: between 192.168.124.127:9300 # port communicating nodes

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After the start being given, the replacement version

This error is largely due to our version of that springboot and elasticsearch version than matching caused, there are two solutions,

The first is to springboot version upgrade, (but generally after the upgrade may still not match),

The second is to replace the low version of the elastic. [Version matches the reference], (https://github.com/spring-projects/spring-data-elasticsearch), we may ask price for their pom kind of elastic and springdata after analysis of the version, in the end I decided to upgrade or downgrade.

 

 

 

org.elasticsearch.transport.ConnectTransportException: [][192.168.124.127:9300] connect_timeout[30s]

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Run ES Mirror

[root@localhost ~]# docker run -e ES_JAVA_OPTS="-Xms256m -Xmx256m" -d -p 9201:9200 -p 9301:9300 --name ES2 5e9d896dc62c

test

:( two uses official website: https://github.com/spring-projects/spring-data-elasticsearch )
* 1. write a ElasticSearchRepository interface sub-interface
* 2. ElasticSearchTemplate operating ES

1. Program Interface

1  // The interface has two generic, ElasticsearchRepository <T, the extends the Serializable ID>
 2      // type of the first data is to be stored, the second type is the primary key 
. 3  public  interface BookRepository the extends ElasticsearchRepository <Book, Integer > {
 4      // may be prepared by custom methods, naming specific method can refer to the official documents in the interface 
. 5      public List <Book> findBookByBookNameLike (String bookName);
 . 6 }

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2, the preparation of an entity class

// @Document role is to specify the entity to be stored class name and type index 
@Document (indexName = "atguigu", type = "Book" )
 public  class Book {
     Private Integer ID;
     Private String author;
     Private String bookName ; 
}

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3 test classes

 1 @Autowired
 2     BookRepository bookRepository;
 3 
 4     @Test
 5     public void test02(){
 6         Book book = new Book();
 7         book.setId(1);
 8         book.setAuthor("刘猛");
 9         book.setBookName("我是特种兵");
10         bookRepository.index(book);
11     }
12     
13     @Test
14     public void test03(){
15        for (Book book : bookRepository.findBookByBookNameLike("我")) {
16             System.out.println(book);
17         }
18     }

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4 Access results

 

 

 Use jest integrated ES

jset gitHub（https://github.com/searchbox-io/Jest/tree/master/jest）

1. Import dependence

 <!-- https://mvnrepository.com/artifact/io.searchbox/jest -->
        <dependency>
            <groupId>io.searchbox</groupId>
            <artifactId>jest</artifactId>
            <version>5.3.3</version>
        </dependency>

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2. Configure host and port

spring:
  elasticsearch:
    jest:
      uris: http://192.168.124.127:9200

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3. Start test

  @Autowired 
    JestClient jestClient; 

    @Test 
    public  void contextLoads () throws IOException {
         // ES index (stored) to a document 
        Article This article was Article This article was = new new Article This article was (); 
        article.setAuthor ( "zhangsan" ); 
        article.setId ( . 1 ); 
        article.setTitle ( "good news" ); 
        article.setContent ( "the Hello world" );
         // . create an index, then the index to atguigu article in the ES index
         // build a functional index 
        index index = new new. Index.Builder (Article This article was) .index ( "atguigu") of the type ( "News" ) .build (); 

        // execute 
        jestClient.execute (index); 
    } 

    / ** 
     * Use jest search function to search for the full text Example 
     * / 
    @Test 
    public  void Search () throws IOException {
         // build query rules 
        String JSON = "{\ n-" + 
                "\" query \ ": {\ n-" + 
                "\" match \ ": {\ n-" + 
                "\" Content \ ": \" Hello \ "\ n-" + 
                "} \ n-" + 
                "} \ n-" + 
                "} " ;
         // building search
        Search = Search new new Search.Builder (json) .addIndex ( "atguigu") to addType ( "News." ) .Build (); 

        // perform a search and get the search results 
        SearchResult the Result = jestClient.execute (Search); 

        System.out .println (result.getJsonString ()); 
    }

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