import org.apache.solr.response.XMLResponseWriter; //导入依赖的package包/类
public void testLazy() {
  QueryResponseWriter qrw = h.getCore().getQueryResponseWriter("useless");
  assertTrue("Should be a lazy class", qrw instanceof SolrCore.LazyQueryResponseWriterWrapper);

  qrw = h.getCore().getQueryResponseWriter("xml");
  assertTrue("Should not be a lazy class", qrw instanceof XMLResponseWriter);

}
 

import org.apache.solr.response.XMLResponseWriter; //导入依赖的package包/类
public static InputStream embeddedQueryToXmlInputStream(SolrParams request, QueryResponse response) {
    XMLResponseWriter xmlWriter = new XMLResponseWriter();
    Writer w = new StringWriter();
    SolrQueryResponse sResponse = new SolrQueryResponse();
    sResponse.setAllValues(response.getResponse());
    try {
        xmlWriter.write(w, new LocalSolrQueryRequest(null, request), sResponse);
    } catch (IOException e) {
        throw new RuntimeException("Unable to convert Solr response into XML", e);
    }
    StringReader stringReader = new StringReader(w.toString());

    ReaderInputStream readerInputStream = new ReaderInputStream(stringReader);
    return readerInputStream;
}