将Solr响应(solrdocumentlist)转换为json(或xml) [英] Converting the solr response (solrdocumentlist) to json (or xml)

问题描述

我正在尝试将响应从HttpSolrServer转换为json格式的搜索.响应以SolrDocumentList形式出现.我现在拥有的代码是:

I am working on a search in which I am trying to convert the response from a HttpSolrServer to json format. The response comes as a SolrDocumentList. The code I have right now is:

SolrQuery solrQuery = new SolrQuery(query);
solrQuery.setParam("wt", "json");  //doesn't affect the return format

QueryResponse rsp = solrServer.query(solrQuery);
SolrDocumentList docs = rsp.getResults();

return docs.toString();

当我打印出退货时，它返回为:

When I print out the return, it comes back as:

{numFound=2,start=0,docs=[SolrDocument{cat=[electronics, camera], features=[3x zoop, 7.1 megapixel Digital ELPH, movie clips up to 640x480 @30 fps, 2.0" TFT LCD, 118,000 pixels, built in flash, red-eye reduction], id=9885A004, inStock=true, includes=32MB SD card, USB cable, AV cable, battery, manu=Canon Inc., manufacturedate_dt=Mon Feb 13 10:26:37 EST 2006, name=Canon PowerShot SD500, popularity=7, price=329.95, store=45.17614,-93.87341, weight=6.4}, SolrDocument{cat=[electronics, multifunction printer, printer, scanner, copier], features=[Multifunction ink-jet color photo printer, Flatbed scanner, optical scan resolution of 1,200 x 2,400 dpi, 2.5" color LCD preview screen, Duplex Copying, Printing speed up to 29ppm black, 19ppm color, Hi-Speed USB, memory card: CompactFlash, Micro Drive, SmartMedia, Memory Stick, Memory Stick Pro, SD Card, and MultiMediaCard], id=0579B002, inStock=true, manu=Canon Inc., name=Canon PIXMA MP500 All-In-One Photo Printer, popularity=6, price=179.99, store=45.17614,-93.87341, weight=352.0}]}}

使用示例数据在canon上进行搜索.

for a search on canon using their example data.

如果我改用return rsp.toString();，则会以以下方式获取标头信息:

If I instead do return rsp.toString(); I get back the header information with it as:

{responseHeader={status=0,QTime=1,params={indent=true,q=canon\*,wt=xml,version=2.2}},response={numFound=2,start=0,docs=[SolrDocument{cat=[electronics, camera], features=[3x zoop, 7.1 megapixel Digital ELPH, movie clips up to 640x480 @30 fps, 2.0" TFT LCD, 118,000 pixels, built in flash, red-eye reduction], id=9885A004, inStock=true, includes=32MB SD card, USB cable, AV cable, battery, manu=Canon Inc., manufacturedate_dt=Mon Feb 13 10:26:37 EST 2006, name=Canon PowerShot SD500, popularity=7, price=329.95, store=45.17614,-93.87341, weight=6.4}, SolrDocument{cat=[electronics, multifunction printer, printer, scanner, copier], features=[Multifunction ink-jet color photo printer, Flatbed scanner, optical scan resolution of 1,200 x 2,400 dpi, 2.5" color LCD preview screen, Duplex Copying, Printing speed up to 29ppm black, 19ppm color, Hi-Speed USB, memory card: CompactFlash, Micro Drive, SmartMedia, Memory Stick, Memory Stick Pro, SD Card, and MultiMediaCard], id=0579B002, inStock=true, manu=Canon Inc., name=Canon PIXMA MP500 All-In-One Photo Printer, popularity=6, price=179.99, store=45.17614,-93.87341, weight=352.0}]}}

我知道，使用HttpSolrServer时，响应格式当前只能是xml或javabin(我已将其设置为xml).这似乎对实际返回的结果及其格式没有影响.

I know that with HttpSolrServer the response format can only currently be of xml or javabin (which I have set to xml). This seems to have no impact on the actual returned results and their format.

我似乎找不到任何有关将响应转换为json的信息.有什么想法吗?

I cannot seem to find anything about converting the response to a json. Any ideas?

推荐答案

虽然这是一个老问题，但我也提出了类似的问题，并且在挖掘代码后，我能够将响应转换为json，尽管我仍然对代码的速度和性能持怀疑态度，以防万一需求过多.

Well although it is an old question, I have come up with a similar issue and after digging the code, i was able to convert the response into json, although i am still sceptical about the speed and performance of the code in case there are too many reqs are coming..

因此，下面是我编写的代码(我使用了Jettison的JSON库，而忽略了for循环的愚蠢结构):

so below is the piece of code that I wrote(I used the JSON lib from Jettison and ignore the stupid structure of the for loop):

QueryResponse qp = server.query(solrQuery);
SolrDocumentList docList= qp.getResults();
JSONObject returnResults = new JSONObject();
Map<Integer, Object> solrDocMap = new HashMap<Integer, Object>();
int counter = 1;
for(Map singleDoc : docList)
{
  solrDocMap.put(counter, new JSONObject(singleDoc));
  counter++;
}
returnResults.put("docs", solrDocMap);

基本上，这将使您能够在json中获得结果... solrj不允许您​​使用除javabin之外的任何类型尽管您可以在查询中显式设置wt

basically this will let you get results in json... solrj doesnt let you use any kind other than javabin although you may set wt in the query explicitly

希望有帮助

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