Spring Data MongoDB支持GridFS

jieforest

Spring Data MongoDB offers a GridFsTemplate to handle the GridFS operations:

<!-- Connection to MongoDB server -->
<mongo:db-factory host="localhost" port="27017" dbname="test" />
<mongo:mapping-converter id="converter" db-factory-ref="mongoDbFactory"/>
 
<!-- MongoDB GridFS Template -->
<bean id="gridTemplate" class="org.springframework.data.mongodb.gridfs.GridFsTemplate">
  <constructor-arg ref="mongoDbFactory"/>
  <constructor-arg ref="converter"/>
</bean>

jieforest

With that template we can easily read the existing GridFS file we inserted before on the command line:

1. @Autowired GridFsTemplate template;
   
2.  
   
3. @Test public void shouldListExistingFiles() {
   
4.          List<GridFSDBFile> files = template.find(null);
   
5.  
   
6.          for (GridFSDBFile file: files) {
   
7.                  System.out.println(file);
   
8.          }
   
9. }

复制代码

jieforest

Spring Data MongoDB offers a GridFsTemplate to handle the GridFS operations:

1. <!-- Connection to MongoDB server -->
   
2. <mongo:db-factory host="localhost" port="27017" dbname="test" />
   
3. <mongo:mapping-converter id="converter" db-factory-ref="mongoDbFactory"/>
   
4. 
   
5. <!-- MongoDB GridFS Template -->
   
6. <bean id="gridTemplate" class="org.springframework.data.mongodb.gridfs.GridFsTemplate">
   
7.   <constructor-arg ref="mongoDbFactory"/>
   
8.   <constructor-arg ref="converter"/>
   
9. </bean>

复制代码

jieforest

With that template we can easily read the existing GridFS file we inserted before on the command line:

1. @Autowired GridFsTemplate template;
   
2. 
   
3. @Test public void shouldListExistingFiles() {
   
4.          List<GridFSDBFile> files = template.find(null);
   
5. 
   
6.          for (GridFSDBFile file: files) {
   
7.                  System.out.println(file);
   
8.          }
   
9. }

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jieforest

Running the above example, you should see an output like this:

1. { "_id" : { "$oid" : "4fe9bda0f2abbef0d127a647"} , "chunkSize" : 262144 , "length" : 2418176 ,
   
2.    "md5" : "19c2a2cc7684ce9d497a59249396ae1d" , "filename" : "mongo.exe" , "contentType" :  null  ,
   
3.   "uploadDate" : { "$date" : "2012-06-26T13:48:16.713Z"} , "aliases" :  null }
   

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In order to access the content of the file, you call GridFSDBFile#getInputStream. You can also store and delete GridFS files quite easily. Have a detailed look at the GridFsTemplate.
The full source code of the above example can be found at github.

jieforest

Running the above example, you should see an output like this:

1. { "_id" : { "$oid" : "4fe9bda0f2abbef0d127a647"} , "chunkSize" : 262144 , "length" : 2418176 ,
   
2.    "md5" : "19c2a2cc7684ce9d497a59249396ae1d" , "filename" : "mongo.exe" , "contentType" :  null  ,
   
3.   "uploadDate" : { "$date" : "2012-06-26T13:48:16.713Z"} , "aliases" :  null }

复制代码

In order to access the content of the file, you call GridFSDBFile#getInputStream. You can also store and delete GridFS files quite easily. Have a detailed look at the GridFsTemplate.

The full source code of the above example can be found at github.