SolrJ增删改查操作（入门级）

最近学习了Lucene和Solr，Java操作Solr就叫SolrJ了，这是我肤浅的理解，下面记录下简单的一些操作，方面日后复习

 

首先导入jar包座标

<!--SolrJ-->
        <dependency>
            <groupId>org.apache.solr</groupId>
            <artifactId>solr-solrj</artifactId>
            <version>7.7.2</version>
        </dependency>

 

然后编写测试类代码（随着Jar包版本更新，写法会不一样，注意一下）：

 

添加：

@Test
    public void testAdd() throws IOException, SolrServerException {

        String solrURL="http://localhost:8080/solr/collection1";

        HttpSolrClient.Builder builder = new HttpSolrClient.Builder(solrURL);
        HttpSolrClient client = builder.build();

        SolrInputDocument doc = new SolrInputDocument();
        doc.setField("id","123");
        doc.setField("age",22);
        
        //doc.setField("asd","nono");
        /*添加一个不存在的Field数据，竟然不报错*/
        
        client.add(doc);
        client.commit();
        /*记得提交，不然结果不生效*/

    }

 

删除

@Test
    public void testDelete() throws IOException, SolrServerException {

        String solrURL="http://localhost:8080/solr/collection1";

        HttpSolrClient.Builder builder = new HttpSolrClient.Builder(solrURL);
        HttpSolrClient client = builder.build();

        client.deleteById("123");

        /*删除所有*/
        //client.deleteByQuery("*:*");
        
        client.commit();
    }

 

修改

修改与添加调用的方法是一致的，都是使用add方法，当ID已经存在时，直接覆盖，这样等同于修改

 

查询（重点）

 @Test
    public void test2() throws IOException, SolrServerException {
        String solrURL="http://localhost:8080/solr/collection1";
        HttpSolrClient.Builder builder = new HttpSolrClient.Builder(solrURL);
        HttpSolrClient client = builder.build();

        SolrQuery query = new SolrQuery();
//        query.setFields("id");
        query.set("q","*:*");
        query.set("fq","age:[1 TO 20]");
        query.addSort("age", SolrQuery.ORDER.desc);

        QueryResponse response = client.query(query);
        SolrDocumentList results = response.getResults();
        long num = results.getNumFound();

        System.out.println("num "+num);
        for (SolrDocument doc : results) {
            System.out.printf("id:%s，name:%s age:%s\n", doc.get("id"), doc.get("name"), doc.get("age"));
        }

    }

 

修改：（api没有修改的方法，只能通过id，先获取之前的doc里面的值，然后新建一个doc，进行覆盖，id相同就可以覆盖）

        SolrInputDocument document = new SolrInputDocument();   //新的文档，直接覆盖旧的
        SolrDocument originalDoc = solrClient.getById(id);
        Collection<String> fieldNames = originalDoc.getFieldNames();
        for (String fieldName : fieldNames) {
            Object value = originalDoc.getFieldValue(fieldName);
            document.addField(fieldName, value);
        }
        
        solrClient.add(document);
        solrClient.commit();