小編典典
終于，經過一天的谷歌搜尋獲得了回報。坦率地說，用于Elasticsearch的Java API文檔可以使用一些端到端示例，更不用說JavaDoc …
這是一個正在運作的示例。您必須在本地主機上運作一個節點，才能正常工作！
package foo;
import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
import java.io.IOException;
import org.elasticsearch.action.admin.indices.create.CreateIndexRequestBuilder;
import org.elasticsearch.action.admin.indices.delete.DeleteIndexRequestBuilder;
import org.elasticsearch.action.admin.indices.exists.indices.IndicesExistsResponse;
import org.elasticsearch.action.get.GetRequestBuilder;
import org.elasticsearch.action.get.GetResponse;
import org.elasticsearch.action.index.IndexRequestBuilder;
import org.elasticsearch.client.Client;
import org.elasticsearch.client.transport.TransportClient;
import org.elasticsearch.common.settings.ImmutableSettings;
import org.elasticsearch.common.transport.InetSocketTransportAddress;
import org.elasticsearch.common.xcontent.XContentBuilder;
public class MyTestClass {
private static final String ID_NOT_FOUND = "";
private static Client getClient() {
final ImmutableSettings.Builder settings = ImmutableSettings.settingsBuilder();
TransportClient transportClient = new TransportClient(settings);
transportClient = transportClient.addTransportAddress(new InetSocketTransportAddress("localhost", 9300));
return transportClient;
}
public static void main(final String[] args) throws IOException, InterruptedException {
final Client client = getClient();
// Create Index and set settings and mappings
final String indexName = "test";
final String documentType = "tweet";
final String documentId = "1";
final String fieldName = "foo";
final String value = "bar";
final IndicesExistsResponse res = client.admin().indices().prepareExists(indexName).execute().actionGet();
if (res.isExists()) {
final DeleteIndexRequestBuilder delIdx = client.admin().indices().prepareDelete(indexName);
delIdx.execute().actionGet();
}
final CreateIndexRequestBuilder createIndexRequestBuilder = client.admin().indices().prepareCreate(indexName);
// MAPPING GOES HERE
final XContentBuilder mappingBuilder = jsonBuilder().startObject().startObject(documentType)
.startObject("_ttl").field("enabled", "true").field("default", "1s").endObject().endObject()
.endObject();
System.out.println(mappingBuilder.string());
createIndexRequestBuilder.addMapping(documentType, mappingBuilder);
// MAPPING DONE
createIndexRequestBuilder.execute().actionGet();
// Add documents
final IndexRequestBuilder indexRequestBuilder = client.prepareIndex(indexName, documentType, documentId);
// build json object
final XContentBuilder contentBuilder = jsonBuilder().startObject().prettyPrint();
contentBuilder.field(fieldName, value);
indexRequestBuilder.setSource(contentBuilder);
indexRequestBuilder.execute().actionGet();
// Get document
System.out.println(getValue(client, indexName, documentType, documentId, fieldName));
int idx = 0;
while (true) {
Thread.sleep(10000L);
idx++;
System.out.println(idx * 10 + " seconds passed");
final String name = getValue(client, indexName, documentType, documentId, fieldName);
if (ID_NOT_FOUND.equals(name)) {
break;
} else {
// Try again
System.out.println(name);
}
}
System.out.println("Document was garbage collected");
}
protected static String getValue(final Client client, final String indexName, final String documentType,
final String documentId, final String fieldName) {
final GetRequestBuilder getRequestBuilder = client.prepareGet(indexName, documentType, documentId);
getRequestBuilder.setFields(new String[] { fieldName });
final GetResponse response2 = getRequestBuilder.execute().actionGet();
if (response2.isExists()) {
final String name = response2.getField(fieldName).getValue().toString();
return name;
} else {
return ID_NOT_FOUND;
}
}
}
2020-06-22