Lucene综合案例

1.引入依赖（在入门环境搭建中已全部引入）

2.加入页面和资源

　　

3.编写配置文件application.yml

spring:
  thymeleaf:
    cache: false #关闭缓存

4.pojo包下加入ResultModel实体类（做分页用）

/**
 * 自定义分页实体类
 */
public class ResultModel {

    // 商品列表
    private List<Sku> skuList;
    // 商品总数
    private Long recordCount;
    // 总页数
    private Long pageCount;
    // 当前页
    private long curPage;

    /********* get/set方法 *********/
}

5.controller代码

@Controller
@RequestMapping("/list")
public class SearchController {

    @Autowired
    private SearchService searchService;

    /**
     * 搜索
     * @param queryString 查询关键字
     * @param price 查询价格范围
     * @param page 当前页
     * @return
     * @throws Exception
     */
    @RequestMapping
    public ModelAndView query(String queryString, String price, Integer page) throws Exception {
        ModelAndView mv = new ModelAndView();

        if (StringUtils.isEmpty(page) || page <= 0) {
            page = 1;
        }

        ResultModel resultModel = searchService.query(queryString, price, page);

        mv.addObject("result", resultModel);
        mv.addObject("queryString", queryString);
        mv.addObject("price", price);
        mv.setViewName("search");
        return mv;
    }
}

6.service代码

@Service
public class SearchService {

    public final static Integer PAGE_SIZE = 20;

    /**
     * 分页查询
     * @param queryString
     * @param price
     * @param page
     * @return
     * @throws Exception
     */
    public ResultModel query(String queryString, String price, Integer page) throws Exception {
        ResultModel resultModel = new ResultModel();

        Integer start = (page - 1) * PAGE_SIZE;
        Integer end = page * PAGE_SIZE;

        Analyzer analyzer = new IKAnalyzer();
        BooleanQuery.Builder builder = new BooleanQuery.Builder();
        QueryParser queryParser = new QueryParser("name", analyzer);

        Query query1 = null;
        if (StringUtils.isEmpty(queryString)) {
            query1 = queryParser.parse("*:*");
        } else {
            query1 = queryParser.parse(queryString);
        }
        builder.add(query1, BooleanClause.Occur.MUST);

        if (!StringUtils.isEmpty(price)) {
            String[] split = price.split("-");
            Query query2 = DoublePoint.newRangeQuery("price", Integer.parseInt(split[0]), Integer.parseInt(split[1]));
            builder.add(query2, BooleanClause.Occur.MUST);
        }

        Directory dir = FSDirectory.open(Paths.get("D:\\lucene"));
        IndexReader indexReader = DirectoryReader.open(dir);

        IndexSearcher searcher = new IndexSearcher(indexReader);
        TopDocs topDocs = searcher.search(builder.build(), end);

        long total = topDocs.totalHits;
        resultModel.setRecordCount(total);

        ScoreDoc[] docs = topDocs.scoreDocs;
        List<Sku> skus = new ArrayList<>();
        if (docs != null) {
            for (int i = start; i < end; i++) {
                // 通过文档id读取文档
                Document document = searcher.doc(docs[i].doc);
                Sku sku = new Sku();
                sku.setId(document.get("id"));
                sku.setName(document.get("name"));
                sku.setPrice(Double.parseDouble(document.get("price")));
                sku.setImage(document.get("image"));
                sku.setCategoryName(document.get("categoryName"));
                sku.setBrandName(document.get("brandName"));
                skus.add(sku);
            }
        }
        resultModel.setSkuList(skus);

        resultModel.setCurPage(page);
        resultModel.setPageCount(total % PAGE_SIZE > 0 ? total / PAGE_SIZE + 1 : total / PAGE_SIZE);

        return resultModel;
    }
}

7.编写启动类

@SpringBootApplication
public class LuceneApplication {
    public static void main(String[] args) {
        SpringApplication.run(LuceneApplication.class, args);
    }
}

8.测试.........