在使用solr時，對solr進行操作可以solr4j直接操作，但在對solr multicore進行操作時(如資料庫分表)有些不方便，因此嘗試了直接採用REST形式進行操作

public class SolrServiceImpl implements SolrService {

    @Override
public boolean addIndex(List<Program> list) { 
        JSONArray array = new JSONArray();
        for (Program p : list) {
            JSONObject object = new 
 
JSONObject();
object.put("id", p.getId());
object.put("name", p.getName());
array.add(object);
}
        String result = HttpUtils.httpPost("http://localhost:8080/solr/update?commit=true", array.toString());
JSONObject resultObj = JSON.parseObject(result);
        int status = resultObj.getJSONObject("responseHeader"
 
).getIntValue("status");
        return status == 0;
}

    @Override
public boolean addIndex(Program program) {
        List<Program> list = new ArrayList<>();
list.add(program);
        return addIndex(list);
}

    @Override
public boolean updateIndexById(Program program) {
        List<Program> list = new 
 
ArrayList<>();
list.add(program);
        return addIndex(list);
}

    @Override
public boolean deleteIndex(long id) {
        //{"delete":[ {"id":"3"}}
JSONObject idObj = new JSONObject();
idObj.put("id", id);
JSONObject delObj = new JSONObject();
delObj.put("delete", idObj);
String result = HttpUtils.httpPost("http://localhost:8080/solr/update?commit=true", delObj.toString());
JSONObject resultObj = JSON.parseObject(result);
        int status = resultObj.getJSONObject("responseHeader").getIntValue("status");
        return status == 0;
}

    @Override
public SolrResult select(List<Integer> websiteIds, String keyword, int start, int num) {
        SolrResult solrResult = new SolrResult();
String result = HttpUtils.httpGet("http://localhost:8080/solr/select?q=*:*&wt=json&start"+start+"&rows="+num);
        if (StringUtils.isNotEmpty(result)) {
            JSONObject jsonObject = JSON.parseObject(result);
JSONObject respObj = jsonObject.getJSONObject("response");
            if (respObj != null) {
                int totals = respObj.getIntValue("numFound");
solrResult.setTotalCount(totals);
JSONArray docsArr = respObj.getJSONArray("docs");
                int size = docsArr.size();
List<Program> programList = new ArrayList<>();
                for (int index = 0; index < size; index++) {
                    JSONObject docObj = docsArr.getJSONObject(index);
Program program = new Program();
program.setPname(docObj.getString("name"));
program.setId(docObj.getLongValue("id"));
programList.add(program);
}
                solrResult.setProgramList(programList);
}
        }
        return solrResult;
}
}

如果需要進行關聯多核進行查詢時，可以採用如下形式：

http://localhost:8080/solr/core_1/select?shards=http://localhost:8080/solr/core_0,http://localhost:8080/solr/core_1&wt=json&q=%E4%BA%86&start=0&rows=10