自定义QueryResponseWriter在solr 7.3.0中不起作用(custom QueryResponseWriter is not working in solr 7.3.0)

 我以驯服文本书为例，在solr中添加自定义的QueryResponseWriter 。 但它没有显示在wt中 
 
 当我点击下面的查询时，显示空的响应 
 
http://localhost:8983/solr/collectiona/type-ahead?q=fayes&wt=tah
 
 在我的solr配置中，我已经放置了下面的lib目录 
 
<lib dir="${solr.install.dir:../../../..}/contrib/customresponsewriter" regex=".*\.jar" />
 
 正如本书所述，我已经为此创建了一个jar文件。 这是我的java类 
 
public class TypeAheadResponseWriter implements QueryResponseWriter {
        private Set<String> fields;


        public void write(Writer writer, SolrQueryRequest solrQueryRequest, SolrQueryResponse solrQueryResponse) throws IOException {
            SolrIndexSearcher searcher = solrQueryRequest.getSearcher();
            NamedList namedList = solrQueryResponse.getValues();
            int size = namedList.size();
            for (int i = 0; i < size; i++) {
                Object val = namedList.getVal(i);
                if (val instanceof DocList) {
                    DocList docList = (DocList) val;
                    DocIterator docIterator = docList.iterator();
                    writer.append("<ul>\n");
                    while (docIterator.hasNext()) {
                        int id = docIterator.nextDoc();
                        Document doc = searcher.doc(id, fields);
                        String name = doc.get("title");
                        writer.append("<li>" + name + "</li>");
                    }
                    writer.append("</ul>\n");
                }
            }
        }


        public String getContentType(SolrQueryRequest solrQueryRequest, SolrQueryResponse solrQueryResponse) {
            return "text/html;charset=UTF-8";
        }


        public void init(NamedList namedList) {
            fields = new HashSet<String>();
            fields.add("title");
        }
}
 
 这是我的solr config queryResponsewriter 
 
<queryResponseWriter name="tah" class="cqw.TypeAheadResponseWriter"/>
   <requestHandler name="/type-ahead" class="solr.SearchHandler">
    <lst name="defaults">
     <str name="wt">tah</str>
     <str name="defType">dismax</str>
     <str name="qf">title_prefix_typeahead^1.0</str>
 </lst>
</requestHandler>
 
 自定义库在solr启动过程中加载，这里是我的Solr日志 
 
 
 
 从路径添加了63个lib到classloader：[/home/bibek/software/java/solr-7.3.0/contrib/clustering/lib，/home/bibek/software/java/solr-7.3.0/contrib/customresponsewriter， /home/bibek/software/java/solr-7.3.0/contrib/extraction/lib，/home/bibek/software/java/solr-7.3.0/contrib/langid/lib，/ home / bibek / software / java /solr-7.3.0/contrib/velocity/lib，/home/bibek/software/java/solr-7.3.0/dist] 
 

I m taking taming text book as an example to add custom QueryResponseWriter in solr. But it is not shown in wt as tah 
 
When I hit following query, empty response is shown
 
http://localhost:8983/solr/collectiona/type-ahead?q=fayes&wt=tah
 
In my solr config, I have placed following dir path of my lib
 
<lib dir="${solr.install.dir:../../../..}/contrib/customresponsewriter" regex=".*\.jar" />
 
I have created a jar file for this as mentioned in the book. Here is my java class
 
public class TypeAheadResponseWriter implements QueryResponseWriter {
        private Set<String> fields;


        public void write(Writer writer, SolrQueryRequest solrQueryRequest, SolrQueryResponse solrQueryResponse) throws IOException {
            SolrIndexSearcher searcher = solrQueryRequest.getSearcher();
            NamedList namedList = solrQueryResponse.getValues();
            int size = namedList.size();
            for (int i = 0; i < size; i++) {
                Object val = namedList.getVal(i);
                if (val instanceof DocList) {
                    DocList docList = (DocList) val;
                    DocIterator docIterator = docList.iterator();
                    writer.append("<ul>\n");
                    while (docIterator.hasNext()) {
                        int id = docIterator.nextDoc();
                        Document doc = searcher.doc(id, fields);
                        String name = doc.get("title");
                        writer.append("<li>" + name + "</li>");
                    }
                    writer.append("</ul>\n");
                }
            }
        }


        public String getContentType(SolrQueryRequest solrQueryRequest, SolrQueryResponse solrQueryResponse) {
            return "text/html;charset=UTF-8";
        }


        public void init(NamedList namedList) {
            fields = new HashSet<String>();
            fields.add("title");
        }
}
 
Here is my solr config for queryResponsewriter
 
<queryResponseWriter name="tah" class="cqw.TypeAheadResponseWriter"/>
   <requestHandler name="/type-ahead" class="solr.SearchHandler">
    <lst name="defaults">
     <str name="wt">tah</str>
     <str name="defType">dismax</str>
     <str name="qf">title_prefix_typeahead^1.0</str>
 </lst>
</requestHandler>
 
custom library is loaded during startup of solr, here is my Solr log
 
 
 
Added 63 libs to classloader, from paths: [/home/bibek/software/java/solr-7.3.0/contrib/clustering/lib, /home/bibek/software/java/solr-7.3.0/contrib/customresponsewriter, /home/bibek/software/java/solr-7.3.0/contrib/extraction/lib, /home/bibek/software/java/solr-7.3.0/contrib/langid/lib, /home/bibek/software/java/solr-7.3.0/contrib/velocity/lib, /home/bibek/software/java/solr-7.3.0/dist]
 

原文：https://stackoverflow.com/questions/50312621