我们的应用经常需要添加检索功能,开源的 ElasticSearch 是目前全文搜索引擎的 首选。他可以快速的存储、搜索和分析海量数据。Spring Boot通过整合Spring Data ElasticSearch为我们提供了非常便捷的检索功能支持;
Elasticsearch是一个分布式搜索服务,提供Restful API,底层基于Lucene,采用 多shard(分片)的方式保证数据安全,并且提供自动resharding的功能,github 等大型的站点也是采用了ElasticSearch作为其搜索服务,
我们采用 docker镜像安装的方式。
#下载镜像 docker pull elasticsearch #启动镜像,elasticsearch 启动是会默认分配2G的内存 ,我们启动是设置小一点,防止我们内存不够启动失败 #9200是elasticsearch 默认的web通信接口,9300是分布式情况下,elasticsearch个节点通信的端口 docker run -e ES_JAVA_OPTS="-Xms256m -Xmx256m" -d -p 9200:9200 -p 9300:9300 --name es01 5c1e1ecfe33a 复制代码
访问 127.0.0.1:9200 如下图,说明安装成功
elasticsearch使用可以参早官方文档,在这里不在讲解。
创建项目 springboot-elasticsearch,引入web支持 SpringBoot 提供了两种方式操作elasticsearch,Jest 和 SpringData。
Jest是ElasticSearch的Java HTTP Rest客户端。
ElasticSearch已经有一个Java API,ElasticSearch也在内部使用它,但是Jest填补了空白,它是ElasticSearch Http Rest接口缺少的客户端。
<?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.gf</groupId> <artifactId>springboot-elasticsearch</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>springboot-elasticsearch</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.1.1.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-elasticsearch</artifactId> </dependency> <dependency> <groupId>io.searchbox</groupId> <artifactId>jest</artifactId> <version>5.3.3</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project> 复制代码
spring.elasticsearch.jest.uris=http://127.0.0.1:9200 复制代码
package com.gf.entity;
import io.searchbox.annotations.JestId;
public class Article {
@JestId
private Integer id;
private String author;
private String title;
private String content;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder( "{/"Article/":{" );
sb.append( "/"id/":" )
.append( id );
sb.append( ",/"author/":/"" )
.append( author ).append( '/"' );
sb.append( ",/"title/":/"" )
.append( title ).append( '/"' );
sb.append( ",/"content/":/"" )
.append( content ).append( '/"' );
sb.append( "}}" );
return sb.toString();
}
}
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package com.gf;
import com.gf.entity.Article;
import io.searchbox.client.JestClient;
import io.searchbox.core.Index;
import io.searchbox.core.Search;
import io.searchbox.core.SearchResult;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.io.IOException;
@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringbootElasticsearchApplicationTests {
@Autowired
JestClient jestClient;
@Test
public void createIndex() {
//1. 给ES中索引(保存)一个文档
Article article = new Article();
article.setId( 1 );
article.setTitle( "好消息" );
article.setAuthor( "张三" );
article.setContent( "Hello World" );
//2. 构建一个索引
Index index = new Index.Builder( article ).index( "gf" ).type( "news" ).build();
try {
//3. 执行
jestClient.execute( index );
} catch (IOException e) {
e.printStackTrace();
}
}
@Test
public void search() {
//查询表达式
String query = "{/n" +
" /"query/" : {/n" +
" /"match/" : {/n" +
" /"content/" : /"hello/"/n" +
" }/n" +
" }/n" +
"}";
//构建搜索功能
Search search = new Search.Builder( query ).addIndex( "gf" ).addType( "news" ).build();
try {
//执行
SearchResult result = jestClient.execute( search );
System.out.println(result.getJsonString());
} catch (IOException e) {
e.printStackTrace();
}
}
}
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Jest的更多api ,可以参照github的文档: github.com/searchbox-i…
spring.data.elasticsearch.cluster-name=elasticsearch spring.data.elasticsearch.cluster-nodes=127.0.0.1:9300 复制代码
package com.gf.entity;
@Document( indexName = "gf" , type = "book")
public class Book {
private Integer id;
private String bookName;
private String author;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getBookName() {
return bookName;
}
public void setBookName(String bookName) {
this.bookName = bookName;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder( "{/"Book/":{" );
sb.append( "/"id/":" )
.append( id );
sb.append( ",/"bookName/":/"" )
.append( bookName ).append( '/"' );
sb.append( ",/"author/":/"" )
.append( author ).append( '/"' );
sb.append( "}}" );
return sb.toString();
}
}
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package com.gf.repository;
import com.gf.entity.Book;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;
import java.util.List;
public interface BookRepository extends ElasticsearchRepository<Book, Integer>{
List<Book> findByBookNameLike(String bookName);
}
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package com.gf;
import com.gf.entity.Article;
import com.gf.entity.Book;
import com.gf.repository.BookRepository;
import io.searchbox.client.JestClient;
import io.searchbox.core.Index;
import io.searchbox.core.Search;
import io.searchbox.core.SearchResult;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.io.IOException;
import java.util.List;
@RunWith(SpringRunner.class)
@SpringBootTest
public class SpringbootElasticsearchApplicationTests {
@Autowired
BookRepository bookRepository;
@Test
public void createIndex2(){
Book book = new Book();
book.setId(1);
book.setBookName("西游记");
book.setAuthor( "吴承恩" );
bookRepository.index( book );
}
@Test
public void useFind() {
List<Book> list = bookRepository.findByBookNameLike( "游" );
for (Book book : list) {
System.out.println(book);
}
}
}
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我们启动测试 ,发现报错 。
这个报错的原因是springData的版本与我elasticsearch的版本有冲突,下午是springData官方文档给出的适配表。
我们使用的springdata elasticsearch的 版本是3.1.3 ,对应的版本应该是6.2.2版本,而我们是的 elasticsearch 是 5.6.9,所以目前我们需要更换elasticsearch的版本为6.X
docker pull elasticsearch:6.5.1 docker run -e ES_JAVA_OPTS="-Xms256m -Xmx256m" -d -p 9200:9200 -p 9300:9300 --name es02 镜像ID 复制代码
访问127.0.0.1:9200
集群名为docker-cluster,所以我们要修改application.properties的配置了
spring.data.elasticsearch.cluster-name=docker-cluster spring.data.elasticsearch.cluster-nodes=127.0.0.1:9300 复制代码
我们再次进行测试,测试可以通过了 。我们访问http://127.0.0.1:9200/gf/book/1,可以得到我们存入的索引信息。
源码下载: github.com/gf-huanchup…