public RestHighLevelClient restHighLevelClient() { HttpHost httpHost = new HttpHost(esHost, esPort, HttpHost.DEFAULT_SCHEME_NAME); RestClientBuilder builder = RestClient.builder(httpHost); CredentialsProvider credentialsProvider = new BasicCredentialsProvider(); credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(esUsername, esPassword)); builder.setHttpClientConfigCallback(f -> f.setDefaultCredentialsProvider(credentialsProvider)); return new RestHighLevelClient(builder); } 分析以上代码
时间: 2024-03-28 12:37:43 浏览: 23
以上代码是一个Spring Boot配置类中的一个方法,用于创建一个连接到Elasticsearch集群的RestHighLevelClient对象。具体分析如下:
1. 方法名:restHighLevelClient
2. 返回类型:RestHighLevelClient
3. 方法体:
- 创建一个HttpHost对象,该对象包含了Elasticsearch集群的地址和端口信息。
- 使用RestClient.builder()创建一个RestClientBuilder对象。
- 创建一个CredentialsProvider对象,并将其设置为BasicCredentialsProvider类型。然后将该对象设置为RestClientBuilder的默认凭证提供程序。
- 最后,使用RestHighLevelClient(builder)创建一个RestHighLevelClient对象,并返回该对象。
该方法中使用的RestHighLevelClient是Elasticsearch官方提供的Java客户端,可以用于进行Elasticsearch的各种操作,如索引、搜索、删除等。
相关问题
public static synchronized RestHighLevelClient getClient() { if (client == null) { HttpHost httpHost = new HttpHost(esHost, esPort, "http"); final CredentialsProvider credentialsProvider = new BasicCredentialsProvider(); credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(esUser, esPassword)); RestClientBuilder builder = RestClient.builder(httpHost).setRequestConfigCallback(new RestClientBuilder.RequestConfigCallback() { @Override public RequestConfig.Builder customizeRequestConfig(RequestConfig.Builder requestConfigBuilder) { requestConfigBuilder.setConnectTimeout(-1); requestConfigBuilder.setSocketTimeout(-1); requestConfigBuilder.setConnectionRequestTimeout(-1); return requestConfigBuilder; } }).setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() { @Override public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) { httpClientBuilder.disableAuthCaching(); return httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider); } }); client = new RestHighLevelClient(builder); } return client; }
这段代码是在使用 Elasticsearch 的 Java 客户端 RestHighLevelClient,创建一个单例的客户端对象。根据代码来看,这里没有明显的 I/O 反应器问题。
不过,这里有一些细节需要注意,例如:
1. 如果您在多个线程中使用这个单例对象,可能会发生线程安全问题。建议在使用单例对象时进行同步处理。
2. 这里设置了连接超时、套接字超时和连接请求超时都为 -1,这意味着连接永远不会超时。这可能会导致客户端一直等待直到超时,如果您的 Elasticsearch 集群出现故障或网络问题,可能会导致客户端一直阻塞。
3. 如果您的 Elasticsearch 集群启用了安全认证,这里使用了 BasicCredentialsProvider 来提供用户名和密码,因此需要确保提供的用户名和密码是正确的。
如果您在使用这段代码时遇到了问题,请提供更多的上下文和错误信息,以便我更好地帮助您解决问题。
springboot整合elasticsearch4.3.6
1. 添加依赖
在pom.xml文件中添加elasticsearch依赖:
```xml
<dependency>
<groupId>org.elasticsearch</groupId>
<artifactId>elasticsearch</artifactId>
<version>4.3.6</version>
</dependency>
```
2. 配置Elasticsearch
在application.properties中添加以下配置:
```properties
# Elasticsearch
elasticsearch.host=localhost
elasticsearch.port=9200
```
3. 创建Elasticsearch客户端
通过Elasticsearch客户端与Elasticsearch进行交互,创建一个Elasticsearch客户端:
```java
@Configuration
public class ElasticsearchConfig {
@Value("${elasticsearch.host}")
private String esHost;
@Value("${elasticsearch.port}")
private int esPort;
@Bean
public RestHighLevelClient restHighLevelClient() {
return new RestHighLevelClient(
RestClient.builder(new HttpHost(esHost, esPort, "http")));
}
}
```
4. 创建Elasticsearch索引
创建一个Elasticsearch索引:
```java
@Service
public class ElasticsearchService {
private final String INDEX = "example";
private final String TYPE = "_doc";
private final RestHighLevelClient restHighLevelClient;
public ElasticsearchService(RestHighLevelClient restHighLevelClient) {
this.restHighLevelClient = restHighLevelClient;
}
public void createIndex() throws IOException {
CreateIndexRequest request = new CreateIndexRequest(INDEX);
restHighLevelClient.indices().create(request, RequestOptions.DEFAULT);
}
public void deleteIndex() throws IOException {
DeleteIndexRequest request = new DeleteIndexRequest(INDEX);
restHighLevelClient.indices().delete(request, RequestOptions.DEFAULT);
}
}
```
5. 添加文档
添加一个文档到Elasticsearch:
```java
@Service
public class ElasticsearchService {
// ...
public void addDocument(String id, String content) throws IOException {
IndexRequest request = new IndexRequest(INDEX, TYPE, id)
.source(Collections.singletonMap("content", content));
restHighLevelClient.index(request, RequestOptions.DEFAULT);
}
}
```
6. 搜索文档
搜索文档:
```java
@Service
public class ElasticsearchService {
// ...
public SearchHits searchDocument(String keyword) throws IOException {
SearchRequest request = new SearchRequest(INDEX);
SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
sourceBuilder.query(QueryBuilders.matchQuery("content", keyword));
request.source(sourceBuilder);
SearchResponse response = restHighLevelClient.search(request, RequestOptions.DEFAULT);
return response.getHits();
}
}
```
7. 测试
在测试类中测试以上方法:
```java
@SpringBootTest
class ElasticsearchApplicationTests {
@Autowired
private ElasticsearchService elasticsearchService;
@Test
void testCreateIndex() throws IOException {
elasticsearchService.createIndex();
}
@Test
void testAddDocument() throws IOException {
elasticsearchService.addDocument("1", "hello world");
}
@Test
void testSearchDocument() throws IOException {
SearchHits hits = elasticsearchService.searchDocument("hello");
for (SearchHit hit : hits) {
System.out.println(hit.getSourceAsString());
}
}
}
```
以上是springboot整合elasticsearch的基本流程。
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