这篇博客从如何从mongodb中导出数据到es中开始，包含了下面几点
- 0.关于logstash （点我）
* 如何从mongodb中读取数据
* 如何指定index Template(es中的索引模板)
- 1.关于es （点我）
* 指定生成索引的mapping
* 指定分词器，中文分词器
- 2.关于springboot （现在是这一部分）
* 关于es中的自动装配
* 我都想哭，关于stored_fields，如何改写ElasticTemplate
* 简单分析一下源码
so ...
springboot data es中提供的ElasticSearchTemplate中的关于构建SearchRequest的部分，关于Fields，stored_fields这个请求参数的问题。
哭了
苍天大地啊。
自动装配
关于springboot 的自动装配不了解的同学，欢迎（点我）了解。
自动装配.png
我们这里使用spring data的这个的整合es.
点进去查看具体自动装配了什么类，然后猜一猜，一般就可以了解各大概了。
image.png
剩下的自己看啊。
简单分析源码
这里我们从查询语句的查询这里开始分析。
image.png
提前说明，因为我改写了ElasticSearchTemplate，所以，我这里的withFieds(...)这个方法才产生的效果是stored_fileds.
第一步:解析传入的值
image.png
解析SearchQuery
image.png
自己打断点查看。
第二步：构建SearchRequest。
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第三步：执行，解析生成的结果。
改写ElasticSearchTemplate
根据上面发现的问题，如果我们想在参数中添加stored_fileds参数，使用原生的ElasticTemplate是不可能实现的，所以我们改写ElasticTemplate
public class MyElasticSearchTemplate extends ElasticsearchTemplate {
private Client client;
private static final String FIELD_SCORE = "_score";
private static final Logger QUERY_LOGGER = LoggerFactory.getLogger("org.springframework.data.elasticsearch.core.QUERY");
private String searchTimeout;
public MyElasticSearchTemplate(Client client){
super(client);
this.client = client;
}
public MyElasticSearchTemplate(Client client, ElasticsearchConverter elasticsearchConverter) {
super(client, elasticsearchConverter, new DefaultResultMapper(elasticsearchConverter.getMappingContext()));
this.client = client;
}
@Override
public <T> AggregatedPage<T> queryForPage(SearchQuery query, Class<T> clazz, SearchResultMapper mapper) {
SearchResponse response = dosearch(prepareSearch(query, clazz), query);
return mapper.mapResults(response, clazz, query.getPageable());
}
@Override
public <T> T query(SearchQuery query, ResultsExtractor<T> resultsExtractor) {
SearchResponse response = dosearch(prepareSearch(query), query);
return resultsExtractor.extract(response);
}
private SearchResponse dosearch(SearchRequestBuilder searchRequest, SearchQuery searchQuery) {
if (searchQuery.getFilter() != null) {
searchRequest.setPostFilter(searchQuery.getFilter());
}
if (!isEmpty(searchQuery.getElasticsearchSorts())) {
for (SortBuilder sort : searchQuery.getElasticsearchSorts()) {
searchRequest.addSort(sort);
}
}
if (!searchQuery.getScriptFields().isEmpty()) {
// _source should be return all the time
// searchRequest.addStoredField("_source");
for (ScriptField scriptedField : searchQuery.getScriptFields()) {
searchRequest.addScriptField(scriptedField.fieldName(), scriptedField.script());
}
}
if (searchQuery.getHighlightFields() != null || searchQuery.getHighlightBuilder() != null) {
HighlightBuilder highlightBuilder = searchQuery.getHighlightBuilder();
if (highlightBuilder == null) {
highlightBuilder = new HighlightBuilder();
}
for (HighlightBuilder.Field highlightField : searchQuery.getHighlightFields()) {
highlightBuilder.field(highlightField);
}
searchRequest.highlighter(highlightBuilder);
}
if (!isEmpty(searchQuery.getIndicesBoost())) {
for (IndexBoost indexBoost : searchQuery.getIndicesBoost()) {
searchRequest.addIndexBoost(indexBoost.getIndexName(), indexBoost.getBoost());
}
}
if (!isEmpty(searchQuery.getAggregations())) {
for (AbstractAggregationBuilder aggregationBuilder : searchQuery.getAggregations()) {
searchRequest.addAggregation(aggregationBuilder);
}
}
if (!isEmpty(searchQuery.getFacets())) {
for (FacetRequest aggregatedFacet : searchQuery.getFacets()) {
searchRequest.addAggregation(aggregatedFacet.getFacet());
}
}
return getSearchResponse(searchRequest.setQuery(searchQuery.getQuery()));
}
private SearchResponse getSearchResponse(SearchRequestBuilder requestBuilder) {
if (QUERY_LOGGER.isDebugEnabled()) {
QUERY_LOGGER.debug(requestBuilder.toString());
}
return getSearchResponse(requestBuilder.execute());
}
private SearchResponse getSearchResponse(ActionFuture<SearchResponse> response) {
return searchTimeout == null ? response.actionGet() : response.actionGet(searchTimeout);
}
private <T> SearchRequestBuilder prepareSearch(Query query, Class<T> clazz) {
if (query.getIndices().isEmpty()) {
query.addIndices(retrieveIndexNameFromPersistentEntity(clazz));
}
if (query.getTypes().isEmpty()) {
query.addTypes(retrieveTypeFromPersistentEntity(clazz));
}
return prepareSearch(query);
}
private String[] retrieveIndexNameFromPersistentEntity(Class clazz) {
if (clazz != null) {
return new String[] { getPersistentEntityFor(clazz).getIndexName() };
}
return null;
}
private String[] retrieveTypeFromPersistentEntity(Class clazz) {
if (clazz != null) {
return new String[] { getPersistentEntityFor(clazz).getIndexType() };
}
return null;
}
private SearchRequestBuilder prepareSearch(Query query) {
Assert.notNull(query.getIndices(), "No index defined for Query");
Assert.notNull(query.getTypes(), "No type defined for Query");
int startRecord = 0;
SearchRequestBuilder searchRequestBuilder = client.prepareSearch(toArray(query.getIndices()))
.setSearchType(query.getSearchType())
.setTypes(toArray(query.getTypes()))
.setVersion(true)
.setTrackScores(query.getTrackScores());
if (query.getSourceFilter() != null) {
SourceFilter sourceFilter = query.getSourceFilter();
searchRequestBuilder.setFetchSource(sourceFilter.getIncludes(), sourceFilter.getExcludes());
}
if (query.getPageable().isPaged()) {
startRecord = query.getPageable().getPageNumber() * query.getPageable().getPageSize();
searchRequestBuilder.setSize(query.getPageable().getPageSize());
}
searchRequestBuilder.setFrom(startRecord);
if (!query.getFields().isEmpty()) {
//修改这句代码
//修改这句代码
//修改这句代码
//修改这句代码
searchRequestBuilder.storedFields(toArray(query.getFields()));
}
if (query.getIndicesOptions() != null) {
searchRequestBuilder.setIndicesOptions(query.getIndicesOptions());
}
if (query.getSort() != null) {
for (Sort.Order order : query.getSort()) {
SortOrder sortOrder = order.getDirection().isDescending() ? SortOrder.DESC : SortOrder.ASC;
if (FIELD_SCORE.equals(order.getProperty())) {
ScoreSortBuilder sort = SortBuilders //
.scoreSort() //
.order(sortOrder);
searchRequestBuilder.addSort(sort);
} else {
FieldSortBuilder sort = SortBuilders //
.fieldSort(order.getProperty()) //
.order(sortOrder);
if (order.getNullHandling() == Sort.NullHandling.NULLS_FIRST) {
sort.missing("_first");
} else if (order.getNullHandling() == Sort.NullHandling.NULLS_LAST) {
sort.missing("_last");
}
searchRequestBuilder.addSort(sort);
}
}
}
if (query.getMinScore() > 0) {
searchRequestBuilder.setMinScore(query.getMinScore());
}
return searchRequestBuilder;
}
private static String[] toArray(List<String> values) {
String[] valuesAsArray = new String[values.size()];
return values.toArray(valuesAsArray);
}
}
注册使用
@Configuration
public class ElasticConfig {
@Autowired
private TransportClient transportClient;
//导入
@Bean
public MyElasticSearchTemplate myElasticSearchTemplate(){
return new MyElasticSearchTemplate(transportClient);
}
@Bean
public ElasticsearchTemplate elasticsearchTemplate() {
try {
return new ElasticsearchTemplate(transportClient);
} catch (Exception var4) {
throw new IllegalStateException(var4);
}
}
}
总结：
我的妈呀，这个问题困扰了特别久，我百度，谷歌都找不到原因，如果我不看源码，我都不知道是这样的。所以推荐大家查看源码解决问题。笔芯。
加油.jpg
