ElasticSearch7.x - Java API 操作

pom文件

<dependencies>
    <dependency>
        <groupId>org.elasticsearchgroupId>
        <artifactId>elasticsearchartifactId>
        <version>7.8.0version>
    dependency>
    
    <dependency>
        <groupId>org.elasticsearch.clientgroupId>
        <artifactId>elasticsearch-rest-high-level-clientartifactId>
        <version>7.8.0version>
    dependency>
    
    <dependency>
        <groupId>org.apache.logging.log4jgroupId>
        <artifactId>log4j-apiartifactId>
        <version>2.8.2version>
    dependency>
    <dependency>
        <groupId>org.apache.logging.log4jgroupId>
        <artifactId>log4j-coreartifactId>
        <version>2.8.2version>
    dependency>
    <dependency>
        <groupId>com.fasterxml.jackson.coregroupId>
        <artifactId>jackson-databindartifactId>
        <version>2.9.9version>
    dependency>
    
    <dependency>
        <groupId>junitgroupId>
        <artifactId>junitartifactId>
        <version>4.12version>
    dependency>
dependencies>

获取连接

// 创建客户端对象
RestHighLevelClient client = new RestHighLevelClient(
    RestClient.builder(new HttpHost("192.168.254.101", 9200, "http"))
);
...
// 关闭客户端连接
client.close();

索引操作

1. 创建索引

   // 创建索引 - 请求对象
   CreateIndexRequest request = new CreateIndexRequest("user");
   // 发送请求，获取响应
   CreateIndexResponse response = client.indices().create(request, 
                                                          RequestOptions.DEFAULT);
   boolean acknowledged = response.isAcknowledged();
   // 响应状态
   System.out.println("操作状态 = " + acknowledged);
   

2. 查看索引

   // 查询索引 - 请求对象
   GetIndexRequest request = new GetIndexRequest("user");
   // 发送请求，获取响应
   GetIndexResponse response = client.indices().get(request, 
   RequestOptions.DEFAULT);
   System.out.println("aliases:"+response.getAliases());
   System.out.println("mappings:"+response.getMappings());
   System.out.println("settings:"+response.getSettings());
   

3. 删除索引

   // 删除索引 - 请求对象
   DeleteIndexRequest request = new DeleteIndexRequest("user");
   // 发送请求，获取响应
   AcknowledgedResponse response = client.indices().delete(request, 
   RequestOptions.DEFAULT);
   // 操作结果
   System.out.println("操作结果 ： " + response.isAcknowledged());
   

文档操作

1. 新增文档

   创建数据模型

   class User {
         
       private String name; 
       private Integer age; 
       private String sex; 
   
       public String getName() {
         
           return name; 
       } 
       public void setName(String name) {
        
           this.name = name; 
       } 
       public Integer getAge() {
        
           return age; 
       } 
       public void setAge(Integer age) {
        
           this.age = age; 
       } 
       public String getSex() {
         
           return sex; 
       } 
       public void setSex(String sex) {
         
           this.sex = sex; 
       } 
   }
   

   创建数据，添加到文档中

   // 新增文档 - 请求对象
   IndexRequest request = new IndexRequest();
   // 设置索引及唯一性标识
   request.index("user").id("1001");
   // 创建数据对象
   User user = new User();
   user.setName("zhangsan");
   user.setAge(30);
   user.setSex("男");
   ObjectMapper objectMapper = new ObjectMapper();
   String productJson = objectMapper.writeValueAsString(user);
   // 添加文档数据，数据格式为 JSON 格式
   request.source(productJson,XContentType.JSON);
   // 客户端发送请求，获取响应对象
   IndexResponse res