blocks|key|354428|text|通过将MongoTemplate设置为SECONDARY，扩展@Trisha的响应：“以编程方式在SECONDARY中执行它”。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|354429|MongoTemplate+template+=+new+MongoTemplate(...);
template.setReadPreference(com.mongodb.ReadPreference.SECONDARY);|code-block|syntax|javascript|354430|entityMap^0|J|9|1D|9|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@$9|N|A|O|B|C]|$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|R|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|S|8|@]|D|@]|E|$]]]|L|$]]

Expanding @Trisha's response in to an answer: "Do it in MongoTemplate programmatically" by setting the <a href="http://api.mongodb.org/java/current/index.html?com/mongodb/ReadPreference.html" rel="noreferrer"><code>ReadPreference</code></a> to <code>SECONDARY</code>.

<pre><code>MongoTemplate template = new MongoTemplate(...);
template.setReadPreference(com.mongodb.ReadPreference.SECONDARY);
</code></pre>

blocks|key|355546|text|声明以下bean|type|unstyled|depth|inlineStyleRanges|entityRanges|data|355547|<bean+id="readPreferenceSecondary"+class="com.mongodb.TaggableReadPreference.SecondaryReadPreference">
</bean>|code-block|syntax|javascript|355548|和|355549|你把这个注入你的蒙戈模板|355550|<bean+id="mongoTemplateProdDb"+class="org.springframework.data.mongodb.core.MongoTemplate"+>
++++++++<property+name="readPreference"+ref="readPreferenceSecondary"></property>
</bean>|355551|entityMap^0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@]|9|@]|A|$]]|$1|I|3|J|5|6|7|R|8|@]|9|@]|A|$]]|$1|K|3|L|5|D|7|S|8|@]|9|@]|A|$E|F]]|$1|M|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|N|$]]

Declare the following bean 

<pre><code>&lt;bean id="readPreferenceSecondary" class="com.mongodb.TaggableReadPreference.SecondaryReadPreference"&gt;
&lt;/bean&gt;
</code></pre>

and 

you inject this in your mongotemplate

<pre><code>&lt;bean id="mongoTemplateProdDb" class="org.springframework.data.mongodb.core.MongoTemplate" &gt;
 &lt;property name="readPreference" ref="readPreferenceSecondary"&gt;&lt;/property&gt;
&lt;/bean&gt;
</code></pre>

blocks|key|2632128|text|如果您有多个辅助(复制集)，您可以使用标签更具体地告诉mongo驱动程序您想要读取的次要文件中的哪个。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2632129|在mongo一侧，运行以下命令：|2632130|db.getMongo().setReadPref('secondaryPreferred',
++++++++++++++++++++++++++[{"tagName":"TagVal1"},
++++++++++++++++++++++++++++{"tagName":"TagVal2"},
++++++++++++++++++++++++++++{}])|code-block|syntax|javascript|2632131|在代码中，如下所示：|2632132|MongoTemplate+template+=+new+MongoTemplate(...)
template.setReadPreference(ReadPreference.secondaryPreferred("your+DBObject+that+reflect+your+mongo+tag+names");|2632133|希望能帮上忙。|2632134|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.mongodb.org/v2.6/reference/method/Mongo.setReadPref/^0|J|2|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@$A|Z|B|10|1|11]]|C|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|13|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|14|8|@]|9|@]|C|$]]|$1|M|3|N|5|H|7|15|8|@]|9|@]|C|$I|J]]|$1|O|3|P|5|6|7|16|8|@]|9|@]|C|$]]|$1|Q|3|-4|5|6|7|17|8|@]|9|@]|C|$]]]|R|$S|$5|T|U|V|C|$W|X]]]]

In case you have more than one secondary (replica-set) you can be more specific and tell the mongo driver explicitly which of the secondaries you want to read from, using <a href="http://docs.mongodb.org/v2.6/reference/method/Mongo.setReadPref/" rel="nofollow">tags</a>.

On the mongo side you run this command:

<pre><code>db.getMongo().setReadPref('secondaryPreferred',
 [{"tagName":"TagVal1"},
 {"tagName":"TagVal2"},
 {}])
</code></pre>

In the code it looks like this:

<pre><code>MongoTemplate template = new MongoTemplate(...)
template.setReadPreference(ReadPreference.secondaryPreferred("your DBObject that reflect your mongo tag names");
</code></pre>

Hope it helps.

blocks|key|355610|text|如果您使用的是spring-data-mongodb，并且需要使用基于find查询的多个读取首选项，则可以创建多个Mongo模板和/或存储库，如|type|unstyled|depth|inlineStyleRanges|entityRanges|data|355611|++++@EnableMongoRepositories(basePackages+=+{
++++++++++++"com.you.repo.package"+},+mongoTemplateRef+=+"mongoTemplateOne")++++
++++@Configuration
++++public+class+MongoConfig+{

++++@Bean(name="mongoTemplateOne")
++++public+MongoTemplate+getMongoTemplateOne()+throws+UnknownHostException+{
++++++++MongoTemplate+templateOne+=+new+MongoTemplate(new+SimpleMongoDbFactory(new+MongoClientURI("YOUR_MONGO_URL")));
++++++++templateOne.setReadPreference(ReadPreference.secondaryPreferred());

++++++++//setting+WriteConcern+but+not+relevant+for+this+thread
++++++++templateOne.setWriteConcernResolver(yourWriteConcernResolver());
++++++++return+templateOne;
++++}

++++@Bean(name+=+"mongoTemplateTwo")
++++public+MongoTemplate+getMongoTemplateTwo()+throws+UnknownHostException+{
++++++++MongoTemplate+templateTwo+=+new+MongoTemplate(new+SimpleMongoDbFactory(new+MongoClientURI("YOUR_MONGO_URL")));
++++++++templateTwo.setReadPreference(ReadPreference.secondaryPreferred());
++++++++return+templateTwo;
++++}


++++private+WriteConcernResolver+yourWriteConcernResolver()+{
++++++++return+action+->+{
++++++++++++if+(action.getCollectionName()
++++++++++++++++++++.equals("your_collecton")
++++++++++++++++++++&&+(action.getMongoActionOperation()+==+MongoActionOperation.SAVE
++++++++++++++++++++++++++++%7C%7C+action.getMongoActionOperation()+==+MongoActionOperation.UPDATE))+{
++++++++++++++++return+WriteConcern.MAJORITY;
++++++++++++}
++++++++++++return+action.getDefaultWriteConcern();
++++++++};
++++}|code-block|syntax|javascript|355612|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

In case you are using spring-data-mongodb and have some requirement to use multiple Read Preferences based on find query, you can create multiple Mongo Templates and/or Repositories like 

<pre><code> @EnableMongoRepositories(basePackages = {
 "com.you.repo.package" }, mongoTemplateRef = "mongoTemplateOne") 
 @Configuration
 public class MongoConfig {

 @Bean(name="mongoTemplateOne")
 public MongoTemplate getMongoTemplateOne() throws UnknownHostException {
 MongoTemplate templateOne = new MongoTemplate(new SimpleMongoDbFactory(new MongoClientURI("YOUR_MONGO_URL")));
 templateOne.setReadPreference(ReadPreference.secondaryPreferred());

 //setting WriteConcern but not relevant for this thread
 templateOne.setWriteConcernResolver(yourWriteConcernResolver());
 return templateOne;
 }

 @Bean(name = "mongoTemplateTwo")
 public MongoTemplate getMongoTemplateTwo() throws UnknownHostException {
 MongoTemplate templateTwo = new MongoTemplate(new SimpleMongoDbFactory(new MongoClientURI("YOUR_MONGO_URL")));
 templateTwo.setReadPreference(ReadPreference.secondaryPreferred());
 return templateTwo;
 }


 private WriteConcernResolver yourWriteConcernResolver() {
 return action -&gt; {
 if (action.getCollectionName()
 .equals("your_collecton")
 &amp;&amp; (action.getMongoActionOperation() == MongoActionOperation.SAVE
 || action.getMongoActionOperation() == MongoActionOperation.UPDATE)) {
 return WriteConcern.MAJORITY;
 }
 return action.getDefaultWriteConcern();
 };
 }
</code></pre>

blocks|key|355645|text|如果需要根据集合的不同在主读和辅助读取之间混合使用，可以在DBCollection对象上设置DBCollection。这有助于避免复杂的多个MongoTemplate配置。相反，在应用程序生命周期中设置一次集合级首选项，如下所示。该特定集合的所有读取都将转到次要集合，而对于其他集合，则会转到主集合。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|355646|DBCollection+dbCollection+=+mongoTemplate.getCollection(mongoTemplate.getCollectionName(collection));
dbCollection.setReadPreference(ReadPreference.secondaryPreferred());|code-block|syntax|javascript|355647|如果您想知道实现它的不同方案，请检查春季数据mongodb二次读取。|355648|entityMap|0|LINK|mutability|MUTABLE|url|https://ttechlearning.blogspot.com/2019/01/spring-data-mongodb-secondary-node-reads.html^0|T|C|1A|C|1Y|D|0|0|I|F|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|11|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|12|8|@]|D|@$9|13|A|14|1|15]]|E|$]]|$1|M|3|-4|5|6|7|16|8|@]|D|@]|E|$]]]|N|$O|$5|P|Q|R|E|$S|T]]]]

If there is a need to mix between primary and secondary for reads depending on the collection, you can set the <code>ReadPreference</code> on the <code>DBCollection</code> object. This helps to avoid complex multiple <code>MongoTemplate</code> configuration. Instead, set collection level preference like below once in the application lifetime. All the reads for that specific collection will go to secondary, while for other collections it goes to primary.

<pre><code>DBCollection dbCollection = mongoTemplate.getCollection(mongoTemplate.getCollectionName(collection));
dbCollection.setReadPreference(ReadPreference.secondaryPreferred());
</code></pre>

If you want to know different options to achieve it, please check <a href="https://ttechlearning.blogspot.com/2019/01/spring-data-mongodb-secondary-node-reads.html" rel="nofollow noreferrer">Spring data mongodb secondary reads</a>

blocks|key|354491|text|从spring-mongo-2.0.xsd开始，slave-ok已经被完全删除，但是已经添加了对ReadPreference的XML的支持。下面是为当前XSD翻译的原始问题中的XML：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|354492|<mongo:mongo-client+host="mongo.sample.com"+port="30000">
+++++<mongo:client-options+read-preference="SECONDARY_PREFERRED"+/>
</mongo:mongo-client>|code-block|syntax|javascript|354493|entityMap|0|LINK|mutability|MUTABLE|url|http://www.springframework.org/schema/data/mongo/spring-mongo-2.0.xsd^0|O|8|1C|E|1|K|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@$9|T|A|U|B|C]|$9|V|A|W|B|C]]|D|@$9|X|A|Y|1|Z]]|E|$]]|$1|F|3|G|5|H|7|10|8|@]|D|@]|E|$I|J]]|$1|K|3|-4|5|6|7|11|8|@]|D|@]|E|$]]]|L|$M|$5|N|O|P|E|$Q|R]]]]

As of <a href="http://www.springframework.org/schema/data/mongo/spring-mongo-2.0.xsd" rel="nofollow noreferrer">spring-mongo-2.0.xsd</a>, <code>slave-ok</code> has been entirely removed, but support has been added for XML config of <code>ReadPreference</code>. Here's the XML from the original question translated for the current XSD:

<pre><code>&lt;mongo:mongo-client host="mongo.sample.com" port="30000"&gt;
 &lt;mongo:client-options read-preference="SECONDARY_PREFERRED" /&gt;
&lt;/mongo:mongo-client&gt;
</code></pre>

blocks|key|1555403|text|下面是使用Mongo存储库进行此操作的另一种方法|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1555404|@Configuration
@EnableMongoRepositories
class+ApplicationConfig+extends+AbstractMongoClientConfiguration+{

++++@Autowired
++++private+Environment+env;

++++@Value("${spring.data.mongodb.uri}")
++++public+String+mongoUri;


++++@Override
++++protected+String+getDatabaseName()+{
++++++++return+env.getProperty("spring.data.mongodb.database");
++++}

++++@Override
++++protected+void+configureClientSettings(MongoClientSettings.Builder+builder)+{
++++++++builder.applyConnectionString(new+ConnectionString(mongoUri)).readPreference(ReadPreference.secondary());
++++}

}|code-block|syntax|javascript|1555405|示例应用程序@+https://github.com/prashanthmadi/cosmosdb-mongodb-readpreference-springboot-java/blob/main/src/main/java/azure/cosmosdb/mongodb/spring/cosmosdbmongodb/ApplicationConfig.java|offset|length|1555406|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/prashanthmadi/cosmosdb-mongodb-readpreference-springboot-java/blob/main/src/main/java/azure/cosmosdb/mongodb/spring/cosmosdbmongodb/ApplicationConfig.java^0|0|0|8|4T|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@]|9|@$I|V|J|W|1|X]]|A|$]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

Here is one more way to do this using Mongo Repositories
<pre><code>@Configuration
@EnableMongoRepositories
class ApplicationConfig extends AbstractMongoClientConfiguration {

 @Autowired
 private Environment env;

 @Value(&quot;${spring.data.mongodb.uri}&quot;)
 public String mongoUri;


 @Override
 protected String getDatabaseName() {
 return env.getProperty(&quot;spring.data.mongodb.database&quot;);
 }

 @Override
 protected void configureClientSettings(MongoClientSettings.Builder builder) {
 builder.applyConnectionString(new ConnectionString(mongoUri)).readPreference(ReadPreference.secondary());
 }

}
</code></pre>
sample app available @
<a href="https://github.com/prashanthmadi/cosmosdb-mongodb-readpreference-springboot-java/blob/main/src/main/java/azure/cosmosdb/mongodb/spring/cosmosdbmongodb/ApplicationConfig.java" rel="nofollow noreferrer">https://github.com/prashanthmadi/cosmosdb-mongodb-readpreference-springboot-java/blob/main/src/main/java/azure/cosmosdb/mongodb/spring/cosmosdbmongodb/ApplicationConfig.java</a>

I am connecting to a MongoDB sharding server via mongodb java driver in Spring MVC. I am using the following versions:

<ul>
<li>spring-webmvc-3.2.1.RELEASE</li>
<li>mongo-java-driver/2.10.0/mongo-java-driver-2.10.0</li>
<li>spring-data-mongodb-1.2.0.RELEASE</li>
</ul>

My Mongo options are set in the contextConfigLocation file mvc-dispatcher-servlet.xml

<pre><code>&lt;mongo:mongo host="mongo.sample.com" port="30000"&gt;
 &lt;mongo:options auto-connect-retry="true"
 slave-ok="true"/&gt;
&lt;/mongo:mongo&gt;
</code></pre>

It works pretty well, but the slave-ok is deprecated by come.MongoDB.ReadPreference. I just wonder if there is any way to set the readPreference for Spring MVC in the contextConfiLocation file.

How to set MongoDB ReadPreference in Spring MVC's contextConfigLocation

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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我正在通过Spring中的MongoDB驱动程序连接到一个mongodb切分服务器。我正在使用以下版本：spring-webmvc-3.2.1.RELEASEmongo-java-driver/2.10.0/mongo-java-driver-2.10.0spring-data-mongodb-1.2.0.RELEAS...

问如何在Spring的MongoDB ReadPreference中设置contextConfigLocation
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问如何在Spring的MongoDB ReadPreference中设置contextConfigLocationEN