Elasticsearch:从 Java High Level Rest Client 切换到新的 Java API Client
在Elasticsearch中,从旧的Java High Level Rest Client切换到新的Java API Client需要对代码做出相应的更改。以下是一个简单的例子,展示了如何从使用RestClient的老方法切换到使用RestHighLevelClient的新方法。
旧的方法(使用High Level Rest Client):
RestClient restClient = RestClient.builder(
new HttpHost("localhost", 9200, "http"),
new HttpHost("localhost", 9201, "http")
).build();
HttpEntity entity = new NStringEntity(
"{\"name\":\"John Doe\"}",
ContentType.APPLICATION_JSON
);
Request request = new Request("PUT", "/posts/doc/1");
request.setEntity(entity);
Response response = restClient.performRequest(request);
新的方法(使用High Level REST Client):
RestHighLevelClient client = new RestHighLevelClient(
RestClient.builder(
new HttpHost("localhost", 9200, "http"),
new HttpHost("localhost", 9201, "http")
)
);
IndexRequest indexRequest = new IndexRequest("posts", "doc", "1");
indexRequest.source(XContentType.JSON, "name", "John Doe");
IndexResponse indexResponse = client.index(indexRequest, RequestOptions.DEFAULT);
client.close();
在新的方法中,我们首先创建了一个RestHighLevelClient
实例,然后使用它的方法来执行索引操作。注意,我们不需要手动构建HTTP请求,Elasticsearch Java API Client为我们封装了这一过程。此外,响应处理也更加简洁,使用了Elasticsearch提供的对象而不是解析字符串。这种新的方法提供了更好的类型安全和可读性,并且使代码更加现代和维护友好。
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