Call Apache Solr API operations to access LindormSearch -

This topic describes how to call the Java API operations of open source Apache Solr to access LindormSearch and provides examples.

Prerequisites

JDK 1.6 or later is installed on a host.
The IP address of your client is added to the whitelist of your Lindorm instance. For more information, see Configure whitelists.

Step 1: Download solr-solrj

Add a Maven dependency. If you create a project in a Maven repository, add the solr-solrj dependency to the pom.xml file. Example:

<dependency>
   <groupId>org.apache.solr</groupId>
   <artifactId>solr-solrj</artifactId>
   <version>8.9.0</version>
</dependency>

Step 2: Create and initialize an instance

If you want to access the instance over the Internet, use the HttpSolrClient mode. The following code provides an example on how to access the instance over the Internet:
```
    String httpUrl = "http://***:8983/solr/";
    HttpSolrClient solrClient = new HttpSolrClient.Builder(httpUrl).build();
```
If you want to access the instance over a private network, use the CloudSolrClient mode. The following code provides an example on how to access the instance over a private network:
```
    String zkHost = "zk1:2181,zk2:2181,zk3:2181/solr"
    CloudSolrClient solrClient = new CloudSolrClient.Builder(Collections.singletonList(zkHost), 
                                    Optional.empty()).build();
```
Note CloudSolrClient ensures thread safety and allows multiple threads of an application to share the same object.

Step 3: Access LindormSearch

The following code provides an example on how to write data:

    List docs = new ArrayList<>();
    SolrInputDocument doc = new SolrInputDocument();
    doc.addField("id", 1);
    doc.addField("name_s", "bob");
    doc.addField("age_i", 18);
    docs.add(doc);
    solrClient.add(docs);

The following code provides an example on how to query data:

    SolrQuery solrQuery = new SolrQuery("name_s:bob");
    QueryResponse response = solrClient.query("your_index", solrQuery);
    SolrDocumentList documentList = response.getResults();
    for(SolrDocument doc : documentList){
        String id = (String)doc.getFieldValue("id");
        //do something
    }
    solrClient.close();

Note For more information about sample code that shows how to query data, see Sample code.