如何在java中使用lambda表达式编写弹性搜索代码
像C#(NEST)一样,我们如何在JAVA中使用lambda表达式编写弹性搜索查询。下面是我使用ElasticSearchJava客户端(HighlevelRestClient)编写的附加代码。如何使用lambda编写代码以降低以下代码的复杂性如何在java中使用lambda表达式编写弹性搜索代码,java,
elasticsearch,elastic-stack,Java,
elasticsearch,Elastic Stack,像C#(NEST)一样,我们如何在JAVA中使用lambda表达式编写弹性搜索查询。下面是我使用ElasticSearchJava客户端(HighlevelRestClient)编写的附加代码。如何使用lambda编写代码以降低以下代码的复杂性 static Map<String,float> fields1=new HashMap<>(); map.put("field1",1f); ... ... .. ... public static List
static Map<String,float> fields1=new HashMap<>();
map.put("field1",1f);
...
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..
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public static List<Result> getSearch(QueryFilter[] qf,List<String> filter2,String input,String filter3) {
SearchRequest searchRequest = new SearchRequest(esIndex);
SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();
boolQueryBuilder.
should(new MultiMatchQueryBuilder(input).minimumShouldMatch("2").type("phrase").boost(5f).fields(fields1)).
should(new MultiMatchQueryBuilder(input).type("phrase").boost(5f).fields(fields2)).
should(new MultiMatchQueryBuilder(input).operator(Operator.AND).type("cross_fields").fields(fields2)).
should(new MultiMatchQueryBuilder(input).operator(Operator.OR).type("cross_fields").fields(fields3)).
should(new MultiMatchQueryBuilder(input).fuzziness("AUTO").type("best_fields").fields(fields4));
if(filter!=null && filter.length>0) {
BoolQueryBuilder boolFieldQuery = new BoolQueryBuilder();
for (QueryFilter qf : filter) {
boolFieldQuery.must(QueryBuilders.matchQuery(qf.getName(), qf.getValue()));
}
boolQueryBuilder.filter(boolFieldQuery);
}
if(!(filter2==null || filter2.isEmpty())) {
if(filter3==null || filter3.isEmpty() ) {
for (String string : filter2) {
boolQueryBuilder.should(new MultiMatchQueryBuilder(string).type("phrase_prefix").boost(10f).field("field1").field("field2"));
}
}
else {
for (String string : filter2) {
boolQueryBuilder.should(new MultiMatchQueryBuilder(string).type("phrase_prefix").boost(10f).field(filter3));
}
}
}
searchSourceBuilder.query(boolQueryBuilder).size(50).from(0).sort(new ScoreSortBuilder().order(SortOrder.DESC));
searchRequest.source(searchSourceBuilder);
try {
SearchResponse searchResponse = esclient.search(searchRequest, RequestOptions.DEFAULT);
SearchHit[] hits = searchResponse.getHits().getHits();
return Arrays.stream(hits).map(hit -> convert(hit.getSourceAsString(), Result.class)).collect(Collectors.toList());
} catch (Exception e) {
e.printStackTrace();
return new ArrayList<>();
}
}
public static <T> T convert(String string, Class<T> pojo) {
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
try {
return objectMapper.readValue(string, pojo);
} catch (IOException e) {
throw new UncheckedIOException(e);
}
}
静态映射字段s1=newhashmap();
地图放置(“现场1”,1f);
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..
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公共静态列表getSearch(QueryFilter[]qf,列表过滤器2,字符串输入,字符串过滤器3){
SearchRequest SearchRequest=新的SearchRequest(esIndex);
SearchSourceBuilder SearchSourceBuilder=新的SearchSourceBuilder();
BoolQueryBuilder BoolQueryBuilder=QueryBuilders.boolQuery();
boolQueryBuilder。
应该(新的MultiMatchQueryBuilder(输入).minimumShouldMatch(“2”).type(“短语”).boost(5f).fields(fields1))。
应该(新的MultiMatchQueryBuilder(输入).type(“短语”).boost(5f).fields(fields2))。
应该(新的MultiMatchQueryBuilder(输入).operator(operator.AND).type(“交叉字段”).fields(fields2))。
应该(新的MultiMatchQueryBuilder(输入).operator(运算符.OR).type(“交叉字段”).fields(字段s3))。
应该(新的MultiMatchQueryBuilder(输入).fuzziness(“自动”).type(“最佳字段”).fields(fields4));
if(filter!=null&&filter.length>0){
BoolQueryBuilder boolFieldQuery=新建BoolQueryBuilder();
用于(查询过滤器qf:过滤器){
boolFieldQuery.must(QueryBuilders.matchQuery(qf.getName(),qf.getValue());
}
过滤器(boolFieldQuery);
}
if(!(filter2==null | | filter2.isEmpty()){
if(filter3==null | | filter3.isEmpty()){
用于(字符串:过滤器2){
boolQueryBuilder.should(新的MultiMatchQueryBuilder(字符串).type(“短语前缀”).boost(10f).field(“field1”).field(“field2”);
}
}
否则{
用于(字符串:过滤器2){
boolQueryBuilder.should(新的MultiMatchQueryBuilder(字符串).type(“短语前缀”).boost(10f).field(filter3));
}
}
}
searchSourceBuilder.query(boolQueryBuilder).size(50).from(0).sort(新的ScoreSortBuilder().order(SortOrder.DESC));
searchRequest.source(searchSourceBuilder);
试一试{
SearchResponse SearchResponse=esclient.search(searchRequest,RequestOptions.DEFAULT);
SearchHit[]hits=searchResponse.getHits().getHits();
返回Arrays.stream(hits).map(hit->convert(hit.getSourceAsString(),Result.class)).collect(Collectors.toList());
}捕获(例外e){
e、 printStackTrace();
返回新的ArrayList();
}
}
公共静态T转换(字符串,类pojo){
ObjectMapper ObjectMapper=新的ObjectMapper();
objectMapper.configure(在未知属性上反序列化feature.FAIL,false);
试一试{
返回objectMapper.readValue(字符串,pojo);
}捕获(IOE异常){
抛出新的未选中异常(e);
}
}