Solr7.4.0的API（Solrj）操作

一.SolrJ的概念

solr单机版服务搭建：https://www.cnblogs.com/frankdeng/p/9615253.html

solr集群版服务搭建：https://www.cnblogs.com/frankdeng/p/9597680.html

SolrJ是一个API，它使用Java（或任何基于JVM的语言）编写的应用程序可以轻松地与Solr交谈。SolrJ隐藏了许多连接到Solr的细节，并允许您的应用程序通过简单的高级方法与Solr交互。SolrJ支持大多数Solr API，并且具有高度可配置性。

官方API参考文档： http://lucene.apache.org/solr/guide/7_4/using-solrj.html#using-solrj

这里使用Maven构建项目，请将以下内容放入pom.xml：

<dependency>
  <groupId>org.apache.solr</groupId>
  <artifactId>solr-solrj</artifactId>
  <version>7.4.0</version>
</dependency>

为了方便测试，导入单元测试依赖和日志依赖

<dependency>
   <groupId>junit</groupId>
   <artifactId>junit</artifactId>
   <version>4.12</version>
    <scope>test</scope>
</dependency>

<dependency>
    <groupId>org.slf4j</groupId>
    <artifactId>slf4j-nop</artifactId>
    <version>1.7.25</version>
</dependency>

二.SolrJ的单机连接

SolrClient是一个抽象类，下边有很多被实现的子类，HttpSolrClient - 面向以查询为中心的工作负载，但也是一个很好的通用客户端。直接与单个Solr节点通信。

不同solr版本solrj 的创建方式有所不同

//solr4创建方式
SolrServer solrServer = new HttpSolrServer(solrUrl); 
//solr5创建方式,在url中指定core名称：core1 
HttpSolrClient solrClient = new HttpSolrClient(solrUrl); 
//solr7创建方式,在url中指定core名称：core1 
HttpSolrClient solrClient = new HttpSolrClient.Builder(solrUrl).build();

例如：

package com.xyg.solr;

import org.apache.solr.client.solrj.impl.HttpSolrClient;
import org.junit.Test;

/**
 * Author: Mr.Deng
 * Date: 2018/9/10
 * Desc: 测试连接客户端
 */
public class testConnectionClient {

    @Test
    public void testConnectionClient(){
        //设置solr客户端url地址
        String solrUrl = "http://node21:8080/solr/new_core";
        //创建solrClient同时指定超时时间，不指定走默认配置
        HttpSolrClient solrClient = new HttpSolrClient.Builder(solrUrl)
                .withConnectionTimeout(10000)
                .withSocketTimeout(60000)
                .build();
        System.out.println(solrClient);
    }
}

三.SolrJ的集群连接

CloudSolrClient - 面向与SolrCloud部署的通信。使用已记录的ZooKeeper状态来发现并将请求路由到健康的Solr节点。

package com.xyg.solrCloud;

import org.apache.solr.client.solrj.impl.CloudSolrClient;
import org.junit.Test;

/**
 * Author: Mr.Deng
 * Date: 2018/9/10
 * Desc: 测试连接客户端
 */
public class ConnectionCloudSolrClient {

    @Test
    public void connectionCloudSolrClient(){
        // 第一种方式：使用运行中的某一台solr节点
        //final String solrUrl = "http://192.168.100.21:8983/solr";
        //CloudSolrClient solrClient = new CloudSolrClient.Builder().withSolrUrl(solrUrl).build();

        // 第二种方式：使用zookeeper节点连接（推荐）
        final String zkHost = "node21:2181,node22:2181,node23:2181/solr";
        CloudSolrClient solrClient = new CloudSolrClient.Builder().withZkHost(zkHost).build();
        System.out.println(solrClient);
    }
}

四.SolrJ的增删改查

这里测试单机版APi操作

1.创建索引

1）指定id单条创建索引

@Test
public void addIndexById() throws IOException, SolrServerException {
    String solrUrl = "http://node21:8080/solr/new_core";
    HttpSolrClient solrClient = new HttpSolrClient.Builder(solrUrl).build();
    //创建索引文档对象
    SolrInputDocument doc = new SolrInputDocument();
    // 第一个参数：域的名称，域的名称必须是在schema.xml中定义的
    // 第二个参数：域的值,注意：id的域不能少
    doc.addField("id","1");
    doc.addField("name","红豆");
    doc.addField("price","1.2");
    //3.将文档写入索引库中
    solrClient.add(doc);
    solrClient.commit();
}

2）批量创建索引

@Test
public void addIndexByListId() throws Exception {
    String solrUrl = "http://node21:8080/solr/new_core";
    HttpSolrClient solrClient = new HttpSolrClient.Builder(solrUrl).build();
    //创建索引文档对象
    SolrInputDocument doc1 = new SolrInputDocument();
    doc1.addField( "id", "2");
    doc1.addField( "name", "绿豆");
    doc1.addField( "price", 1.8 );
    SolrInputDocument doc2 = new SolrInputDocument();
    doc2.addField( "id", "3" );
    doc2.addField( "name", "黑豆" );
    doc2.addField( "price", 2.6 );
    Collection<SolrInputDocument> docs = new ArrayList<SolrInputDocument>();
    docs.add(doc1);
    docs.add(doc2);
    //3.将文档写入索引库中
    solrClient.add(docs);
    solrClient.commit();
}

2.查询索引

1）匹配查询

    @Test
    public void findIndex1() throws IOException, SolrServerException {
        String solrUrl = "http://node21:8080/solr/new_core";
        HttpSolrClient solrClient = new HttpSolrClient.Builder(solrUrl).build();
        // 创建搜索对象
        SolrQuery query = new SolrQuery();
        // 设置搜索条件
        query.set("q","*:*");
        //设置每页显示多少条
        query.setRows(2);
        //发起搜索请求
        QueryResponse response = solrClient.query(query);
        // 查询结果
        SolrDocumentList docs = response.getResults();
        // 查询结果总数
        long cnt = docs.getNumFound();
        System.out.println("总条数为"+cnt+"条");
        for (SolrDocument doc : docs) {
          System.out.println("id:"+ doc.get("id") + ",name:"+ doc.get("name") + ",price:"+ doc.get("price"));
        }
        solrClient.close();
    }

2）条件过滤查询

 @Test
    public void findIndex2() throws IOException, SolrServerException {
        String solrUrl = "http://node21:8080/solr/new_core";
        HttpSolrClient solrClient = new HttpSolrClient.Builder(solrUrl).build();
        //2 封装查询参数
        Map<String, String> queryParamMap = new HashMap<String, String>();
        queryParamMap.put("q", "*:*");
        //3 添加到SolrParams对象,SolrParams 有一个 SolrQuery 子类，它提供了一些方法极大地简化了查询操作
        MapSolrParams queryParams = new MapSolrParams(queryParamMap);
        //4 执行查询返回QueryResponse
        QueryResponse response = solrClient.query(queryParams);
        //5 获取doc文档
        SolrDocumentList docs = response.getResults();
        // 查询结果总数
        long cnt = docs.getNumFound();
        System.out.println("总条数为" + cnt + "条");
        //[6]内容遍历
        for (SolrDocument doc : docs) {
            System.out.println("id:" + doc.get("id") + ",name:" + doc.get("name") + ",price:" + doc.get("price"));
        }
        solrClient.close();
    }

3.更新索引

    @Test
    public void updateIndex() throws IOException, SolrServerException {
        String solrUrl = "http://node21:8080/solr/new_core";
        HttpSolrClient solrClient = new HttpSolrClient.Builder(solrUrl).build();
        //创建索引文档对象
        SolrInputDocument doc = new SolrInputDocument();
        //把红豆价格修改为1.5
        doc.addField("id","1");
        doc.addField("name","红豆");
        doc.addField("price","1.5");
        //3.将文档写入索引库中
        solrClient.add(doc);
        solrClient.commit();
        //提交
        solrClient.commit();

    }

4.删除索引

1）单一条件删除

    @Test
    public void deleteIndexById() throws IOException, SolrServerException {
        String solrUrl = "http://node21:8080/solr/new_core";
        HttpSolrClient solrClient = new HttpSolrClient.Builder(solrUrl).build();
        //全删
        //solrClient.deleteByQuery("*:*");
        //模糊匹配删除（带有分词效果的删除）
        solrClient.deleteByQuery("name:红");
        //指定id删除
        //solrClient.deleteById("1");
        solrClient.commit();
    }

2）批量条件删除

    @Test
    public void deleteIndexByListId() throws IOException, SolrServerException {
        String solrUrl = "http://node21:8080/solr/new_core";
        HttpSolrClient solrClient = new HttpSolrClient.Builder(solrUrl).build();
        //通过id删除
        ArrayList<String> ids = new ArrayList<String>();
        ids.add("2");
        ids.add("3");
        solrClient.deleteById(ids);
        //[3]提交
        solrClient.commit();
        //[4]关闭资源
        solrClient.close();
    }