ES-java
全文搜索，拆分，分词--获得id，获取部分数据装载进去，简化版数据，用一种状态展示出来，点击详情走的是数据库查询查看显示详情
倒排索引（特征），创建文档，使用文档--加速查询
下载Elasticsearch 7.16.2 | Elastic
打开，目录E:\soft\elasticsearch-7.16.2\bin中的elasticsearch.bat文件，双击即可，首次打开较慢，时间还行，里面两个端口，9300与9200，9200是对外访问端口，启动成功，直接浏览器访问http://localhost:9200/即可
IK分词器Releases · medcl/elasticsearch-analysis-ik · GitHub
下载好的ik分词器东西放置在这里E:\soft\elasticsearch-7.16.2\plugins\ik，重启
http://localhost:9200/books Body raw JSON
{
"mappings":{
"properties":{
"id":{
"type":"keyword"//关键字
},
"name":{
"type":"text",//文本
"analyzer":"ik_max_word"，//分词器
"copy_to":"all"//拷贝到虚拟字段all中
},
"type":{
"type":"keyword"//关键字
},
"description":{
"type":"text",//文本
"analyzer":"ik_max_word",//分词器
"copy_to":"all"//拷贝到虚拟字段all中
},
"all":{
"type":"text",
"analyzer":"ik_max_word"
}
}
}
}
主要的几个方法
private RestHighLevelClient client;
//创建索引
@Test
void testCreateIndexByIk() throws IOException {
//客户端操作
CreateIndexRequest request = new CreateIndexRequest("books");
//设置请求中的参数
String json = "{\n" +
" \"mappings\":{\n" +
" \"properties\":{\n" +
" \"id\":{\n" +
" \"type\":\"keyword\"\n" +
" },\n" +
" \"name\":{\n" +
" \"type\":\"text\",\n" +
" \"analyzer\":\"ik_max_word\",\n" +
" \"copy_to\":\"all\"\n" +
" },\n" +
" \"type\":{\n" +
" \"type\":\"keyword\"\n" +
" },\n" +
" \"description\":{\n" +
" \"type\":\"text\",\n" +
" \"analyzer\":\"ik_max_word\",\n" +
" \"copy_to\":\"all\"\n" +
" },\n" +
" \"all\":{\n" +
" \"type\":\"text\",\n" +
" \"analyzer\":\"ik_max_word\"\n" +
" }\n" +
" }\n" +
" }\n" +
"}";
request.source(json, XContentType.JSON);
//获取操作索引的客户端对象，调用创建索引操作
client.indices().create(request, RequestOptions.DEFAULT);
}
//添加全部文档
@Test
void testCreateDocAll() throws IOException {
List bookList = bookMapper.selectList(null);
BulkRequest bulk = new BulkRequest();
for (Book book : bookList) {
IndexRequest request = new IndexRequest("books").id(book.getId().toString());
//对象转json
String json = JSON.toJSONString(book);
request.source(json,XContentType.JSON);
bulk.add(request);
}
client.bulk(bulk,RequestOptions.DEFAULT);
}
//按id查询文档
@Test
void testGrtById() throws IOException {
GetRequest request = new GetRequest("books","1");
GetResponse documentFields = client.get(request, RequestOptions.DEFAULT);
String sourceAsString = documentFields.getSourceAsString();
System.out.println(sourceAsString);
}
//按条件查询文档
@Test
void testSearch() throws IOException {
//创建查books的索引
SearchRequest searchRequest = new SearchRequest("books");
//设置查询条件
SearchSourceBuilder builder = new SearchSourceBuilder();
builder.query(QueryBuilders.termQuery("all","java"));
searchRequest.source(builder);
SearchResponse search = client.search(searchRequest, RequestOptions.DEFAULT);
SearchHits hits = search.getHits();//命中的数据
for (SearchHit hit : hits) {
String sourceAsString = hit.getSourceAsString();
//System.out.println(sourceAsString);
//json转对象
Book book = JSON.parseObject(sourceAsString, Book.class);
System.out.println(book);
}
}