ES查询

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查询所有(matchAllQuery)

//查询所有
@Test
public void matchAllQuery(){
    //1 执行查询
    SearchResponse searchResponse = client.prepareSearch("blog").setTypes("article").setQuery(QueryBuilders.matchAllQuery()).get();

    //2 打印查询结果
    SearchHits hits = searchResponse.getHits();  //获取命中次数,查询结果有多少对象

    System.out.println("查询结果有:"+hits.getTotalHits()+"条");

    Iterator<SearchHit> iterator = hits.iterator();
    while (iterator.hasNext()){
        SearchHit next = iterator.next();//每个查询对象
        System.out.println(next.getSourceAsString());
    }
    // 3 关闭连接
    client.close();
}

结果

查询结果有:3条
{“name”:“zyd”,“id”:“2”,“title”:“大数据”}
{“id”:“35”,“title”:“努力一定有收获!”,“content”:“你就是未来”}
{“id”:“5”,“title”:“基于Lucene的搜索服务器”,“content”:“它提供了一个分布式多用户能力的全文搜索引擎，基于RESTful web接口。大数据前景无限”,“createDate”:“2017-8-22”}

对所有字段分词查询(queryStringQuery)

其实本质是切分为一个个的汉字

//对所有字段分词查询(queryStringQuery)
@Test
public void querysStringQuuery(){
    //1 条件查询
    SearchResponse searchResponse = client.prepareSearch("blog").setTypes("article").setQuery(QueryBuilders.queryStringQuery("大数据")).get();

    //2 打印查询结果
    SearchHits hits = searchResponse.getHits();         //获取命中次数,查询结果有多少对

    System.out.println("查询结果有: "+hits.getTotalHits()+"条");

    Iterator<SearchHit> iterator = hits.iterator();
    while (iterator.hasNext()){
        SearchHit next = iterator.next();       //每个查询对象
        System.out.println(next.getSourceAsString());       //获取字符串格式打印
    }

    //3 关闭连接
    client.close();
}

结果

查询结果有: 2条
{“name”:“zyd”,“id”:“2”,“title”:“大数据”}
{“id”:“5”,“title”:“基于Lucene的搜索服务器”,“content”:“它提供了一个分布式多用户能力的全文搜索引擎，基于RESTful web接口。大数据前景无限”,“createDate”:“2017-8-22”}

通配符查询(wildcardQuery)

*表示多个字符(任意字符)

?:表示单个字符

@Test
public void wildQuery(){
    //1 通配符查询
    SearchResponse searchResponse = client.prepareSearch("blog").setTypes("article").setQuery(QueryBuilders.wildcardQuery("content", "*你*")).get();

    //2 打印查询结果
    SearchHits hits = searchResponse.getHits(); //获取命中次数,查询结果有多少对象

    System.out.println("查询结果有: "+hits.getTotalHits()+"条");

    Iterator<SearchHit> iterator = hits.iterator();
    while (iterator.hasNext()){
        SearchHit next = iterator.next();
        System.out.println(next.getSourceAsString());
    }
    //3 关闭连接
    client.close();
}

结果

查询结果有: 1条

{“id”:“35”,“title”:“努力一定有收获!”,“content”:“你就是未来”}

词条查询(TermQuery)

查找的是一个个的汉字

//词条查询（TermQuery）
@Test
public void termQuery(){
    //1 第一个 field查询
    SearchResponse response = client.prepareSearch("blog").setTypes("article").setQuery(QueryBuilders.termQuery("content","你")).get();

    //2 打印查询结果
    SearchHits hits = response.getHits();
    System.out.println("查询结果有: "+hits.getTotalHits()+"条");

    Iterator<SearchHit> iterator = hits.iterator();
    while (iterator.hasNext()){
        SearchHit next = iterator.next(); //每个查询对象
        System.out.println(next.getSourceAsString());  //获取字符串格式打印
    }
    client.close();
}

结果

查询结果有: 1条
{“id”:“35”,“title”:“努力一定有收获!”,“content”:“你就是未来”}

模糊查询(fuzzy)

有一定的容错机制,且不区分单词的大小写

@Test
public void fuzzy(){
     //1 模糊查询
    SearchResponse response = client.prepareSearch("blog").setTypes("article").setQuery(QueryBuilders.fuzzyQuery("title", "lucene")).get();

    //2 打印查询结果
    SearchHits hits = response.getHits();
    System.out.println("查询结果有:"+hits.getTotalHits()+"条");

    Iterator<SearchHit> iterator = hits.iterator();
    while (iterator.hasNext()){
        SearchHit next = iterator.next();
        System.out.println(next.getSourceAsString());
    }

     //关闭连接
    client.close();
}

映射相关操作

@Test
public void createMapping() throws IOException, ExecutionException, InterruptedException {
     //1 设置mapping
    XContentBuilder builder = XContentFactory.jsonBuilder()
            .startObject()
            .startObject("article")
            .startObject("properties")
            .startObject("id1")
            .field("type", "string")
            .field("store", "yes")
            .endObject()
            .startObject("title2")
            .field("type", "string")
            .field("store", "no")
            .endObject()
            .startObject("content")
            .field("type", "string")
            .field("store", "yes")
            .endObject()
            .endObject()
            .endObject()
            .endObject();

    //2 添加mapping

    PutMappingRequest mapping = Requests.putMappingRequest("blog4").type("article").source(builder);

    client.admin().indices().putMapping(mapping).get();

    //3 关闭资源
    client.close();
}

结果:

注意事项:

需要是一个空的索引才能插入

不然报错

java.util.concurrent.ExecutionException: RemoteTransportException[[testnote01][192.168.18.50:9300][indices:admin/mapping/put]]; nested: IllegalArgumentException[Mapper for [content] conflicts with existing mapping in other types:
[mapper [content] has different [store] values]];