blocks|key|1770707|text|这里展示的不是JSON，而是嵌入式MongoDB外壳的Javascript代码。如果你出于某种原因需要在Java环境中执行代码，你将不得不嵌入Javascript引擎(如Rhino)并实现兼容的应用程序接口。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1770708|否则，您只需要将JSON转换为DBObject，您可以使用JSON.parse()方法或任何其他JSON映射库(如Jackson+)来完成此操作。注意，MongoDB使用了JSON：http://www.mongodb.org/display/DOCS/Data%2BTypes%2Band%2BConventions中没有的一组扩展数据类型|style|CODE|1770709|UPD:+Scott+Hernandez指出了JSON.parse。|1770710|entityMap|0|LINK|mutability|MUTABLE|url|http://www.mozilla.org/rhino/|1|http://api.mongodb.org/java/current/com/mongodb/util/JSON.html#parse(java.lang.String)|2|http://jackson.codehaus.org/|3|http://www.mongodb.org/display/DOCS/Data%2BTypes%2Band%2BConventions^0|2D|5|0|0|F|8|T|C|1|1L|7|2|2J|1Q|3|0|N|A|0^^$0|@$1|2|3|4|5|6|7|X|8|@]|9|@$A|Y|B|Z|1|10]]|C|$]]|$1|D|3|E|5|6|7|11|8|@$A|12|B|13|F|G]]|9|@$A|14|B|15|1|16]|$A|17|B|18|1|19]|$A|1A|B|1B|1|1C]]|C|$]]|$1|H|3|I|5|6|7|1D|8|@$A|1E|B|1F|F|G]]|9|@]|C|$]]|$1|J|3|-4|5|6|7|1G|8|@]|9|@]|C|$]]]|K|$L|$5|M|N|O|C|$P|Q]]|R|$5|M|N|O|C|$P|S]]|T|$5|M|N|O|C|$P|U]]|V|$5|M|N|O|C|$P|W]]]]

What you showed here is not JSON, it's Javascript code for embedded MongoDB Shell. If you need for some reason to execute the code inside Java environment you will have to embed Javascript engine (like <a href="http://www.mozilla.org/rhino/" rel="noreferrer">Rhino</a>) and implement compatible API. 

Otherwise you just need to convert JSON to <code>DBObject</code> and you can do this with <a href="http://api.mongodb.org/java/current/com/mongodb/util/JSON.html#parse(java.lang.String)" rel="noreferrer">JSON.parse()</a> method or any other JSON-mapping library like <a href="http://jackson.codehaus.org/" rel="noreferrer">Jackson</a>. Note that MongoDB uses extended set of data types that are not present in JSON: <a href="http://www.mongodb.org/display/DOCS/Data+Types+and+Conventions" rel="noreferrer">http://www.mongodb.org/display/DOCS/Data+Types+and+Conventions</a>

UPD: Scott Hernandez pointed out about <code>JSON.parse</code>.

blocks|key|4509342|text|您可以按照本教程中的示例操作：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4509343|http://www.mongodb.org/display/DOCS/Java%2BTutorial#JavaTutorial-GettingASetofDocumentsWithaQuery|offset|length|4509344|注意他们使用(基本)DBObject来创建查询，而不是字符串。|4509345|entityMap|0|LINK|mutability|MUTABLE|url|http://www.mongodb.org/display/DOCS/Java%2BTutorial#JavaTutorial-GettingASetofDocumentsWithaQuery^0|0|0|2N|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@]|9|@$D|R|E|S|1|T]]|A|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

You can follow the example in the tutorial:

<a href="http://www.mongodb.org/display/DOCS/Java+Tutorial#JavaTutorial-GettingASetofDocumentsWithaQuery" rel="nofollow">http://www.mongodb.org/display/DOCS/Java+Tutorial#JavaTutorial-GettingASetofDocumentsWithaQuery</a>

Note their use a of (Basic)DBObject to create the query, not a string.

blocks|key|4509395|text|看一下Jongo+library+-它将允许您使用命令行语法运行非常高级的查询。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|4509396|它还使用非常快速的GSON映射器将您自己的对象作为查询结果返回给您，而不是BasicDBObjects列表。|4509397|entityMap|0|LINK|mutability|MUTABLE|url|http://jongo.org/^0|3|D|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

Take a look at the <a href="http://jongo.org/" rel="nofollow">Jongo library</a> - it will allow you to run even pretty advanced queries using the command-line syntax. 

It also uses a very fast GSON mapper to return your own objects back to you as the result of the query, instead of a list of BasicDBObjects.

blocks|key|1773613|text|我建议使用mongo-shell-like-query实用程序(jar)。它允许你用java+(或scala)代码编写mongo查询，使用与mongo命令shell相同的语法。更具体地说，您可以以字符串格式编写mongo查询。它还支持诸如聚合管道等高级功能。看一看https://github.com/EqualExperts/mongo-shell-like-query|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1773614|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/EqualExperts/mongo-shell-like-query^0|3O|1I|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

I would recommend to use mongo-shell-like-query utility (jar). It allows you to write mongo queries in java (or scala) code using the same syntax as that of mongo command shell. To be more specific, you can write mongo queries in string format. It also supports advance features such as aggregation pipeline. 
Have a look at 
<a href="https://github.com/EqualExperts/mongo-shell-like-query" rel="nofollow">https://github.com/EqualExperts/mongo-shell-like-query</a>

blocks|key|2910191|text|是的，有办法，通过将过滤器作为字符串传递。示例：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2910192|BasicDBObject+query+=+BasicDBObject.parse("{userId:+{$gt:+\"1\"}}");
FindIterable<Document>+dumps+=+crapCollection.find(query);|code-block|syntax|javascript|2910193|您也可以使用com.mongodb.util.JSON，但我不建议您这样做。它不太具有描述性。|offset|length|style|CODE|2910194|DBObject+dbObject+=+(DBObject)JSON.parse("{userId:+{$gt:+\"1\"}}");|2910195|请注意，这可能容易受到SQL注入的攻击，因为您自己解析/构建过滤器。|2910196|我推荐使用Jongo's+parameterized+query。|2910197|entityMap|0|LINK|mutability|MUTABLE|url|http://jongo.org/#query-templating^0|0|0|6|L|0|0|0|5|R|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|11|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|12|8|@$I|13|J|14|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|15|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|17|8|@]|9|@$I|18|J|19|1|1A]]|A|$]]|$1|S|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]]]

Yes, there is way, by passing the filter as a string. Example:

<pre><code>BasicDBObject query = BasicDBObject.parse("{userId: {$gt: \"1\"}}");
FindIterable&lt;Document&gt; dumps = crapCollection.find(query);
</code></pre>

You can Also use <code>com.mongodb.util.JSON</code>, but I don't recommend it. It's less descriptive. 

<pre><code>DBObject dbObject = (DBObject)JSON.parse("{userId: {$gt: \"1\"}}");
</code></pre>

Please notice that this might be vulnerable to SQL injections because you parse/build the filter yourself.

I recommend using <a href="http://jongo.org/#query-templating" rel="noreferrer">Jongo's parameterized query</a>.

I was wondering if there is a way to execute mongo like query directly through Java i.e. we give mongoDB like query as a String to a function in Java driver for mongoDB as a String Object and an DBCursor Object is returned. Something like:

<pre><code>import com.mongodb.*;
import java.net.UnknownHostException;
public class ExecuteQuery {
public static void main(String args[]){
 try{
 Mongo m = new Mongo();
 DB db = m.getDB("test");
 DBCollection coll = db.getCollection("first");
 DBObject doc = new BasicDBObject();
 DBCursor cur =coll.executeQuery("db.first.find({"username":"joe"})");
 }
 catch(UnknownHostException e){
 System.out.println(e);
 }
 catch (MongoException.DuplicateKey e) {
 System.out.println("Exception Caught" + e);
 }
}
}
</code></pre>

Note: <code>executeQuery()</code> is not a built in function. It is just used for demonstration purposes. 
So, Is there a function in the java api which converts a json string to a <code>BasicDBObject</code> instance? Thanks.

Executing Mongo like Query (JSON)through Java

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我想知道是否有一种方法可以直接通过Java执行mongo like查询，即我们将mongoDB like查询作为字符串作为字符串提供给mongoDB的Java驱动程序中的函数，然后返回一个DBCursor对象。类似于：import com.mongodb.*;import java.net.UnknownHostExc...

问通过Java执行Mongo like查询(JSON)
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