spring-boot集成elasticsearch并实现简单的增删改查

java操作elasticsearch是作为一个无数据节点与其他节点之间通信，端口是9300.elasticsearch和jdk版本一定要适配，因为elasticsearch是用java编写的，随着版本的升级，用的也是最新版的jdk，所以低版本的jdk就和最新elasticsearch版本不匹配。但是，高版本的jdk可以向下兼容低版本的elasticsearch，因为jdk在升级的过程中，自身也要向下兼容。这一点很重要，否则项目是起不来的。我用的是jdk1.8,elasticsearch-2.4.2。现在，让我们开始集成。

一、注入elasticsearch依赖

 

 
    
            org.elasticsearch
            elasticsearch
            
        
        
            org.springframework.boot
            spring-boot-starter-data-elasticsearch
        
         
        
            org.springframework.data
            spring-data-elasticsearch
        
          
            com.fasterxml.jackson.core  
            jackson-databind  
            
		 
		 
            net.java.dev.jna
            jna
            
        

 

二、在application.properties中添加elasticsearch配置

 

# elasticsearch
spring.data.elasticsearch.cluster-name=elasticsearch  #节点名字，默认elasticsearch
spring.data.elasticsearch.cluster-nodes=127.0.0.1:9300  #节点地址，多个节点用逗号隔开
#spring.data.elasticsearch.local=false
spring.data.elasticsearch.repositories.enable=true

三、实体类

 

 

import org.springframework.data.annotation.Id;
import org.springframework.data.elasticsearch.annotations.Document;
import org.springframework.data.elasticsearch.annotations.Field;
 
// indexName ：索引名字（对应mysql的数据库名字）
//type:类型（对应mysql的表名）
@Document(indexName = "megacorp",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;}
}

 

 

四、编写dao

 

 

import org.springframework.data.elasticsearch.repository.ElasticsearchRepository;
import org.springframework.stereotype.Component;

import com.example.demo.elasticsearch.entity.Employee;

@Component
public interface EmployeeRepository extends ElasticsearchRepository{
	
	Employee queryEmployeeById(String id);

}

五、由于咱们就是入门测试，service我就省略了，直接书写接口了

 

 

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.example.demo.elasticsearch.dao.EmployeeRepository;
import com.example.demo.elasticsearch.entity.Employee;
import com.google.gson.Gson;

@RestController
@RequestMapping("/es")
public class ElasticSearchController {
	
    @Autowired
    private EmployeeRepository er;
	
	//增加
	@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");
		er.save(employee);
		
		System.err.println("add a obj");
		
		return "success";
	}
	
        //删除
	@RequestMapping("/delete")
	public String delete(){
		
		er.delete("1");
		
		return "success";
	}
	
        //局部更新
	@RequestMapping("/update")
	public String update(){
		
		Employee employee=er.queryEmployeeById("1");
		employee.setFirstName("哈哈");
		er.save(employee);
		
		System.err.println("update a obj");
	
		return "success";
	}
	
        //查询
	@RequestMapping("/query")
	public Employee query(){
		
		Employee accountInfo=er.queryEmployeeById("1");
		System.err.println(new Gson().toJson(accountInfo));
		
		return accountInfo;
	}
	
}

 

 

至此，elasticsearch就算是入门了。