Java操作ElasticSearch(四、排序、高亮、分页、Filter过滤、source筛选)

排序

通过 SearchSourceBuilder 的 sort(String, SortOrder) 方法用来实现排序条件的封装

@Test
public void test18() throws IOException {
    SearchRequest request = new SearchRequest("user");
    SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
    searchSourceBuilder.query(QueryBuilders.matchQuery("note", "Java"));
    // 对搜索到的结果按年龄升序排序
    searchSourceBuilder.sort(new FieldSortBuilder("age").order(SortOrder.ASC));
    request.source(searchSourceBuilder);
    SearchResponse response = client.search(request, RequestOptions.DEFAULT);
    SearchHits searchHits = response.getHits();
    System.out.println("命中数:" + searchHits.getTotalHits().value);
    SearchHit[] hits = searchHits.getHits();
    for (SearchHit hit : hits) {
        String sourceAsString = hit.getSourceAsString();
        User user = JSON.parseObject(sourceAsString, User.class);
        System.out.println(user);
    }
}

 

 

 

高亮

@Test
public void test20() throws IOException {
    SearchRequest request = new SearchRequest("user");
    SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
    searchSourceBuilder.query(QueryBuilders.matchQuery("note", "唱歌表演"));
    // 高亮，指定高亮字段
    searchSourceBuilder.highlighter(new HighlightBuilder().field("note"));
    request.source(searchSourceBuilder);
    SearchResponse response = client.search(request, RequestOptions.DEFAULT);
    SearchHits searchHits = response.getHits();
    System.out.println("命中数:" + searchHits.getTotalHits().value);
    SearchHit[] hits = searchHits.getHits();
    for (SearchHit hit : hits) {
        String sourceAsString = hit.getSourceAsString();
        User user = JSON.parseObject(sourceAsString, User.class);
        HighlightField note = hit.getHighlightFields().get("note");
        user.setNote(note.getFragments()[0].toString());
        System.out.println(user);
    }
}

 

 

 

分页

在原来查询的基础上，给 SearchSourceBuilder 中添加 from 和 size 即可。

page = 1、size = 5，代表查询第一页，每页5条，可以计算出：from = (page - 1) * size  = 0

@Test
public void test19() throws IOException {
    SearchRequest request = new SearchRequest("user");
    SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
    searchSourceBuilder.query(QueryBuilders.matchAllQuery());
    // from 开始索引
    // size 每页显示几条
    searchSourceBuilder.from(0);
    searchSourceBuilder.size(5);
    // 对搜索到的结果按年龄升序排序
    searchSourceBuilder.sort(new FieldSortBuilder("age").order(SortOrder.ASC));
    request.source(searchSourceBuilder);
    SearchResponse response = client.search(request, RequestOptions.DEFAULT);
    SearchHits searchHits = response.getHits();
    System.out.println("命中数:" + searchHits.getTotalHits().value);
    SearchHit[] hits = searchHits.getHits();
    for (SearchHit hit : hits) {
        String sourceAsString = hit.getSourceAsString();
        User user = JSON.parseObject(sourceAsString, User.class);
        System.out.println(user);
    }
}

 

 

 

filter过滤

添加 filter 条件，不参与打分

 

 

source筛选

在原来搜索的基础上，通过 SearchSourceBuilder 的 fetchSource(String[] includes, String[] excludes)方法实现

• includes 包含的字段
• excludes 要排除的字段

@Test
public void test17() throws IOException {
    SearchRequest request = new SearchRequest("user");
    SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
    searchSourceBuilder.query(QueryBuilders.matchQuery("note", "Java"));
    // 不要id、age
    searchSourceBuilder.fetchSource(new String[0], new String[]{"id", "age"});
    request.source(searchSourceBuilder);
    SearchResponse response = client.search(request, RequestOptions.DEFAULT);
    SearchHits searchHits = response.getHits();
    System.out.println("命中数:" + searchHits.getTotalHits());
    SearchHit[] hits = searchHits.getHits();
    for (SearchHit hit : hits) {
        String sourceAsString = hit.getSourceAsString();
        User user = JSON.parseObject(sourceAsString, User.class);
        System.out.println(user);
    }
}