如何开始在Java中使用Apache solr并运行简单的查询而不会遇到错误？(How to start using Apache solr with Java and run simple quer

如何开始在Java中使用Apache solr并运行简单的查询而不会遇到错误？(How to start using Apache solr with Java and run simple queries without running into errors?)

我一直在尝试在Windows中运行并尝试Apache Solr（连接和运行Java查询）两天，并且花了大约15个不同的计算器搜索和5个长教程来克服我面临的所有错误和问题。 这个问题的目的是为那些遇到同样问题的人提供自我问答。 我使用的是：Windows 7，Apache solr 5.5.0，Maven和Eclipse。 注意：我知道我没有完全覆盖所有内容，但我希望我能帮助人们克服一些问题！

将会（希望）涵盖的问题包括：

我在哪里下载solr？ （SO独立） 我如何从Windows控制台启动solr？ 我如何创建一个集合（从Windows控制台）？ 我如何从Java创建连接？ （SO独立） 如何将文档添加到我的收藏中？ （SO独立） 如何从我的收藏中删除文档？ （SO独立） 我如何查询我的文档？ （SO独立） 我可以从浏览器访问我的收藏集吗？

I have been trying to run and try Apache solr (connecting and running Java queries) in Windows for two days, and it took me about 15 different stackoverflow searches and 5 long tutorials to overcome all the errors and questions that I was facing. This question is intended as a self-Q&A for those experiencing the same problems. I'm using: Windows 7, Apache solr 5.5.0, Maven and Eclipse. Note: I know I'm not covering absolutely everything, but I hope I can help people overcome some of their problems!

Questions that will be (hopefully) covered:

Where do I download solr? (SO independent) How do I start solr (from the windows console)? How do I create a collection (from the windows console)? How do I create a connection from Java? (SO independent) How do I add a document to my collection? (SO independent) How do I delete a document from my collection? (SO independent) How do I query my documents? (SO independent) Can I access my collection from the browser and how?

最满意答案

我在哪里下载solr？ （SO独立）

你可以从这里得到solr 5.5.0。

我如何从Windows控制台启动solr？

$ solr-5.5.0/bin/solr.cmd start

我如何创建一个集合（从Windows控制台）？

$ solr-5.5.0/bin/solr create -c gettingstarted

“起步”是你收藏的名字。

我如何从Java创建连接？ （SO独立）

这部分有点棘手，因为它已经改变了不同的solr版本。 现在，你可以这样做：

String urlString = "http://localhost:8983/solr/gettingstarted"; SolrClient solr = new HttpSolrClient(urlString);

注意这个url不包含“＃/〜cores”。 它会给你连接错误，如果你像这样复制完整的网址。

如何将文档添加到我的收藏中？ （SO独立）

// Adds a document containing two fields: id and first_name, with // values "123" and "randombee" respectively SolrInputDocument document = new SolrInputDocument(); document.addField("id", "123"); document.addField("first_name", "randombee"); solr.add(document); solr.commit(); // you MUST do this to commit the changes to your collection

如何从我的收藏中删除文档？ （SO独立）

有两种不同的方法可以做到这一点：按ID删除文档（如果您已经知道该字段）或通过查询删除文档。

// Deletes document with id="mymockid" solr.deleteById("mymockid"); solr.commit(); // Deletes all documents with first_name:randombee solr.deleteByQuery("first_name:randombee"); solr.commit();

我如何查询我的文档？ （SO独立）

关于如何做到这一点的两个例子。 如果要查询集合中的所有文档，可以在查询中使用*：*来实现它：

// Queries all documents (*:*) and shows only the id SolrQuery query = new SolrQuery(); query.setQuery("*:*"); // actual query QueryResponse response = null; try { response = solr.query(query); } catch (SolrServerException e) {/* */ } SolrDocumentList list = response.getResults(); System.out.println(list.toString()); // print the results of the query

查询特定数据：

// Queries documents with first_name=randombee or id=SP2514N // and shows fields id and name query = new SolrQuery(); query.setQuery("first_name:randombee OR id:SP2514N"); query.setFields("id", "name"); // set fields you want to show response = null; try { response = solr.query(query); } catch (SolrServerException e) {/* */ } list = response.getResults(); System.out.println(list.toString());

这给了我这个结果：

{numFound = 1，start = 0，docs = [SolrDocument {id = 123，first_name = randombee}]}

我可以从浏览器访问我的收藏吗？

假设solr正在本地主机和端口8983中运行，访问http：// localhost：8983 / solr / mycollection / browse将显示集合“mycollection”中的所有文档。 请注意，该路径不是 http：// localhost：8983 / solr /＃/〜cores / gettingstarted ，即使这是访问所有内核时显示的路径。 您必须删除＃/〜核心部分并添加/浏览以查看您的集合。

Where do I download solr? (SO independent)

You can get solr 5.5.0 from here.

How do I start solr (from the windows console)?

$ solr-5.5.0/bin/solr.cmd start

How do I create a collection (from the windows console)?

$ solr-5.5.0/bin/solr create -c gettingstarted

where "gettingstarted" is the name of your collection.

How do I create a connection from Java? (SO independent)

This part is a bit tricky, since it has changed over different solr releases. Right now, you can do it like this:

String urlString = "http://localhost:8983/solr/gettingstarted"; SolrClient solr = new HttpSolrClient(urlString);

Notice that the url doesn't contain "#/~cores". It will give you connection errors if you copy the full url like that.

How do I add a document to my collection? (SO independent)

// Adds a document containing two fields: id and first_name, with // values "123" and "randombee" respectively SolrInputDocument document = new SolrInputDocument(); document.addField("id", "123"); document.addField("first_name", "randombee"); solr.add(document); solr.commit(); // you MUST do this to commit the changes to your collection

How do I delete a document from my collection? (SO independent)

There are two different ways you can do this: deleting a document by id (if you already know that field) or deleting a document by query.

// Deletes document with id="mymockid" solr.deleteById("mymockid"); solr.commit(); // Deletes all documents with first_name:randombee solr.deleteByQuery("first_name:randombee"); solr.commit();

How do I query my documents? (SO independent)

Two examples on how to do it. If you want to query all the documents in the collection, you can use *:* in your query to achieve it:

// Queries all documents (*:*) and shows only the id SolrQuery query = new SolrQuery(); query.setQuery("*:*"); // actual query QueryResponse response = null; try { response = solr.query(query); } catch (SolrServerException e) {/* */ } SolrDocumentList list = response.getResults(); System.out.println(list.toString()); // print the results of the query

Query for specific data:

// Queries documents with first_name=randombee or id=SP2514N // and shows fields id and name query = new SolrQuery(); query.setQuery("first_name:randombee OR id:SP2514N"); query.setFields("id", "name"); // set fields you want to show response = null; try { response = solr.query(query); } catch (SolrServerException e) {/* */ } list = response.getResults(); System.out.println(list.toString());

which gives me this result:

{numFound=1,start=0,docs=[SolrDocument{id=123, first_name=randombee}]}

Can I access my collection from the browser?

Assuming solr is running in localhost and port 8983, accessing http://localhost:8983/solr/mycollection/browse will show you all the documents in the collection "mycollection". Note that the path is not http://localhost:8983/solr/#/~cores/gettingstarted, even if that is the path showing when you access all the cores. You have to remove the #/~cores part and add the /browse to see your collection.