Get highlighted snippets with SolrJ

Introduction#

When we get highlighted snippets in our Solr response programmatically, we need to extract and handle them. The code below shows how to do that with SolrJ.

Get highlighted text for single-valued fields

public String getHighlightedText(final QueryResponse queryResponse, final String fieldName, final String docId) {
    String highlightedText = "";
    Map<String, Map<String, List<String>>> highlights = queryResponse.getHighlighting();
    if (highlights!=null && MapUtils.isNotEmpty(highlights.get(docId))) {
        List<String> snippets = highlights.get(docId).get(fieldName);
        if (CollectionUtils.isNotEmpty(snippets)) {
            highlightedText = getFragments(snippets);
        }
    }
    return highlightedText;
}

private static final String getFragments(List<String> snippets){
        StringBuilder fragments = new StringBuilder();
        for (int i = 0; i < snippets.size(); i++) {
            if (i > 0) {
                fragments.append("............");
            }
            fragments.append(snippets.get(i));
        }
        return fragments.toString();
    }