lucene_09_solrj的使用

什么是solrj

 solrj 是访问Solr 服务的java客户端，提供索引（增删改）和搜索（查）的请求方法，Solrj 通常在嵌入在业务系统中，通过Solrj的API接口操作Solr服务，如下图:

solr的使用

第一步：配置pom.xml

内容如下：

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.chen</groupId>
  <artifactId>solr</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>solr</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>

    <!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
    <dependency>
      <groupId>commons-io</groupId>
      <artifactId>commons-io</artifactId>
      <version>2.5</version>
    </dependency>


    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-log4j12</artifactId>
      <version>1.7.7</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/org.apache.solr/solr-solrj -->
    <dependency>
      <groupId>org.apache.solr</groupId>
      <artifactId>solr-solrj</artifactId>
      <version>7.2.1</version>
    </dependency>
      <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>RELEASE</version>
      </dependency>


  </dependencies>
</project>

第二步：java代码

/**
 * FileName: SolrManager
 * Author:   GET_CHEN
 * Date:     2018/4/3 14:29
 * Description:
 */
package com.chen;

import org.apache.solr.client.solrj.SolrQuery;
import org.apache.solr.client.solrj.SolrServerException;
import org.apache.solr.client.solrj.impl.HttpSolrClient;
import org.apache.solr.client.solrj.response.QueryResponse;
import org.apache.solr.common.SolrDocument;
import org.apache.solr.common.SolrDocumentList;
import org.apache.solr.common.SolrInputDocument;
import org.junit.Test;

import java.io.IOException;
import java.util.List;
import java.util.Map;

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

        String baseSolrUrl = "http://localhost:8080/solr/collection2"; //solr的访问路径。collection2是solr的核。默认是collection1.
        //连接solr服务器
        HttpSolrClient httpSolrClient = new HttpSolrClient.Builder(baseSolrUrl).build();

        SolrInputDocument document = new SolrInputDocument();
        document.addField("id", "333");
        document.addField("blog_title", "solrj的使用");
        document.addField("blog_keyWord", "solrj");

        httpSolrClient.add(document);
        
        httpSolrClient.commit();
        httpSolrClient.close();


    }

    @Test
    public void testDelete() throws IOException, SolrServerException {
        String baseSolrUrl = "http://localhost:8080/solr/collection2";
        //连接solr服务器
        HttpSolrClient httpSolrClient = new HttpSolrClient.Builder(baseSolrUrl).build();
//        httpSolrClient.deleteById("333");//通过id删除
        httpSolrClient.deleteByQuery("*:*");//通过语法删，删除全部
        httpSolrClient.commit();
        httpSolrClient.close();
    }

    @Test
    public void testQuery() throws Exception {
        String baseSolrUrl = "http://localhost:8080/solr/collection2";
        System.out.println(baseSolrUrl);
        //连接solr服务器
        HttpSolrClient httpSolrClient = new HttpSolrClient.Builder(baseSolrUrl).build();
        SolrQuery solrQuery = new SolrQuery();
        solrQuery.setQuery("*:*");
        QueryResponse queryResponse = httpSolrClient.query(solrQuery);
        SolrDocumentList results = queryResponse.getResults();
        for (SolrDocument document: results) {
            System.out.println(document.get("id"));
            System.out.println(document.get("blog_title"));
            System.out.println(document.get("blog_summary"));
            System.out.println(document.get("blog_keyWord"));
            System.out.println("==========================");
        }
        httpSolrClient.commit();
        httpSolrClient.close();
    }

    @Test
    public void testDiffQuery() throws Exception{

        String baseSolrUrl = "http://localhost:8080/solr/collection2";
        //连接solr服务器
        HttpSolrClient httpSolrClient = new HttpSolrClient.Builder(baseSolrUrl).build();
        SolrQuery solrQuery = new SolrQuery();
        //关键字
        solrQuery.setQuery("大学");
        //设置默认域
        solrQuery.set("df","blog_title");
        //设置查询域
       solrQuery.set("fl","id,blog_summary");
        //排序
        solrQuery.setSort("id", SolrQuery.ORDER.desc);
        //分页
        solrQuery.setStart(0);
        solrQuery.setRows(3);
        //高亮
        solrQuery.setHighlight(true);
        //指定高亮域
        solrQuery.addHighlightField("blog_title");
        solrQuery.setHighlightSimplePre("<span style='color:red'>");
        solrQuery.setHighlightSimplePost("</span>");
        QueryResponse queryResponse = httpSolrClient.query(solrQuery);
        SolrDocumentList results = queryResponse.getResults();
        //获取高亮内容
        Map<String, Map<String, List<String>>> highlighting = queryResponse.getHighlighting();


        for (SolrDocument document: results) {
            System.out.println(document.get("id"));
            System.out.println(document.get("blog_title"));
            System.out.println(document.get("blog_summary"));
            System.out.println(document.get("blog_keyWord"));
            System.out.println("==========================");
            Map<String, List<String>> map = highlighting.get(document.get("id"));
            List<String> blog_summary = map.get("blog_title");
            System.out.println(blog_summary.get(0));
            System.out.println("==========highlighting===============");
        }
        httpSolrClient.commit();
        httpSolrClient.close();

    }
}