SpringBoot集成Elasticsearch并进行增删改查操作_elasticsearchrepository更新

今天给大家简单的介绍一下SpringBoot如何集成Elasticsearch，并简单的介绍一下基于SpringBoot模式下怎么进行简单的增删改查操作，这边增删改查操作有点类似于JPA的模式。（什么是JPA模式，大家可以自行搜索答案）

史上最全Java技术栈面试题都在这里面了：Java面试题

废话不多说，现在马上开始我们今天的内容。如何新建Springboot项目我这边就不废话了，不会的同学可以看我以前写的教程。

文章地址：IDEA上面如何创建SpringBoot项目-CSDN博客

1.首先是引入相关的依赖，下面是我的pom文件。

<?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.elasticsearch</groupId>
	<artifactId>elasticsearch</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>
 
	<name>ElasticSearch</name>
	<description>ElasticSearch project for Spring Boot</description>
 
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.2.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>
		<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
		<dependency>
			<groupId>com.google.code.gson</groupId>
			<artifactId>gson</artifactId>
			<version>2.8.0</version>
		</dependency>
 
		<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-data-elasticsearch -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-elasticsearch</artifactId>
			<version>2.0.2.RELEASE</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>

pom.xml文件中最重要的其实就是引入ES（Elasticsearch的简称后面我都这么叫），也就是spring-boot-starter-data-elasticsearch 依赖。

2.接下来就是对应的配置文件了，具体配置文件如下所示：

# elasticsearch集群名称，默认的是elasticsearch
spring.data.elasticsearch.cluster-name=my-application
 
#节点的地址 注意api模式下端口号是9300，千万不要写成9200
spring.data.elasticsearch.cluster-nodes=192.168.11.24:9300
 
#是否开启本地存储
spring.data.elasticsearch.repositories.enable=true

3.索引对应的实体类如下所示：

package com.elasticsearch.entity;
import org.springframework.data.annotation.Id;
import org.springframework.data.elasticsearch.annotations.Document;
import org.springframework.data.elasticsearch.annotations.Field;
 
/**
 * @author linzhiqiang
 * @date 2018/5/16
 */
@Document(indexName = "company",type = "employee", shards = 1,replicas = 0, refreshInterval = "-1")
public class Employee {
    @Id
    private String id;
    @Field
    private String firstName;
    @Field
    private String lastName;
    @Field
    private Integer age = 0;
    @Field
    private String about;
 
    public String getId() {
        return id;
    }
 
    public void setId(String id) {
        this.id = id;
    }
 
    public String getFirstName() {
        return firstName;
    }
 
    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }
 
    public String getLastName() {
        return lastName;
    }
 
    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
 
    public Integer getAge() {
        return age;
    }
 
    public void setAge(Integer age) {
        this.age = age;
    }
 
    public String getAbout() {
        return about;
    }
 
    public void setAbout(String about) {
        this.about = about;
    }
}

4.实体类对应的dao接口如下所示：

package com.elasticsearch.dao;
 
/**
 * Created by 19130 on 2018/5/16.
 */
import com.elasticsearch.entity.Employee;
import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;
import org.springframework.stereotype.Component;
/**
 * @author linzhiqiang
 */
@Component
public interface EmployeeRepository extends ElasticsearchRepository<Employee,String>{
 
    /**
     * 查询雇员信息
     * @param id
     * @return
     */
    Employee queryEmployeeById(String id);
}

5.实体类对应的控制类如下所示：

package com.elasticsearch.controller;
import com.elasticsearch.dao.EmployeeRepository;
import com.elasticsearch.entity.Employee;
import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
 
/**
 * @author linzhiqiang
 */
@RestController
@RequestMapping("es")
public class EmployeeController {
 
    @Autowired
    private EmployeeRepository employeeRepository;
 
    /**
     * 添加
     * @return
     */
    @RequestMapping("add")
    public String add() {
        Employee employee = new Employee();
        employee.setId("1");
        employee.setFirstName("xuxu");
        employee.setLastName("zh");
        employee.setAge(26);
        employee.setAbout("i am in peking");
        employeeRepository.save(employee);
        System.err.println("add a obj");
        return "success";
    }
 
    /**
     * 删除
     * @return
     */
    @RequestMapping("delete")
    public String delete() {
        Employee employee = employeeRepository.queryEmployeeById("1");
        employeeRepository.delete(employee);
        return "success";
    }
 
    /**
     * 局部更新
     * @return
     */
    @RequestMapping("update")
    public String update() {
        Employee employee = employeeRepository.queryEmployeeById("1");
        employee.setFirstName("哈哈");
        employeeRepository.save(employee);
        System.err.println("update a obj");
        return "success";
    }
    /**
     * 查询
     * @return
     */
    @RequestMapping("query")
    public Employee query() {
        Employee accountInfo = employeeRepository.queryEmployeeById("1");
        System.err.println(new Gson().toJson(accountInfo));
        return accountInfo;
    }
}  

以上所有的增删改查操作都要基于搭建好的ES系统（关于Linux上面如何搭建ES系统大家可以自行google）

关于我踩过的坑：

1.ES中API的端口号是9300而不是9200。

2.ES系统中Elasticsearch.yml配置文件中要加入network.host: 0.0.0.0，否则外网地址访问不了。

3.最新的资料一定要去官网上面查看，博客上面好多都是过时的。官网地址：Elasticsearch Platform — Find real-time answers at scale | Elastic

4.注意JDK、ES、Springboot三者之间的版本，很多时候错误都是版本冲突引起的。

下一节课程将会给大家介绍一下，Java是如何通过ES提供的API进行索引的增删改查操作。（和今天的模式不一样哦）

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