I. Preparatory work
As usual, we need to prepare a series of jar packages first. I cut a picture here, as shown below.
Which jar bag? Commons-beans- 1.8.3，commons-lang-2.6，Commons-collections-3.2 . 1，Commons-logging- 1. 1，Ezmorph- 1。
Second, the database connection configuration
There are two ways to connect MongoDB database with Spring data: one is through JDBC connection, and the other is through Spring reading XML configuration file connection.
The first connection mode is introduced here, and the second connection mode will be introduced later.
1. Create the configuration file "DataSource.properties" to store the database information for later modification. The content is as follows:
Host = 127.0.0. 1
Port=270 17
Database = King
User name = King
Password = King
The above configuration is: server address where the target database is located, database connection port, database name, user name and password. * Please configure according to the actual situation.
2. Get a database connection
The interfaces and classes responsible for database connection are not introduced here. Interested parties can click on the link to view the official document: Interface? MongoOperations？ And class? MongoTemplate. Among them, the MongoTemplate class implements the interface MongoOperations.
Below I attach the source code of the MongoUtil class I wrote. This class mainly encapsulates the code to get an instance of MongoTemplate.
Parcel? com . report . util；
Import? Java . net . unknown host exception；
Import? Java . util . locale；
Import? Java . util . resource bundle；
Import? org . spring framework . data . authentic ation . user credentials；
Import? org . spring framework . data . MongoDB . core . mongooperations；
Import? org . spring framework . data . MongoDB . core . mongotemplate；
Import? org . spring framework . data . MongoDB . core . simplemongodbfactory；
Import? com . MongoDB . mongo；
Public? Class? Mongotil? {
Private? Variable? Static electricity MongoOperations？ mongoOperation
Private? Static electricity Final? String? Profile name? =? "data source";
Private? Static electricity Final? String? KEY_HOST？ =? "host";
Private? Static electricity Final? String? KEY_PORT？ =? "port";
Private? Static electricity Final? String? KEY_DATABASE？ =? "database";
Private? Static electricity Final? String? KEY_USERNAME？ =? "User name";
Private? Static electricity Final? String? KEY_PASSWORD？ =? "password";
Private? MongoUtil()？ {
}
Public? Static electricity MongoOperations？ getMongoOperation()？ {
What if? (mongoOperation？ ==? null)？ {
Resource bundle? Resource bundle? =? ResourceBundle.getBundle(
Profile name? locale . get default())； //Get the configuration file "DataSource.properties"
String? hostAddr？ =? resource bundle . getstring(KEY _ HOST)？ +? ":"
+? resource bundle . getstring(KEY _ PORT)；
User credentials? User credentials? =? New? User credentials (
resource bundle . getstring(KEY _ USERNAME)，
resource bundle . getstring(KEY _ PASSWORD))；
Try it? {
mongoOperation？ =? New? MongoTemplate(
New? SimpleMongoDbFactory (new? Mongo(hostAddr)，
resource bundle . getstring(KEY _ DATABASE)，
user credentials))；
}? Catch? (UnknownHostException？ e)？ {
e . printstacktrace()；
}
}
Return? mongoOperation
}
}3. Create test data databases, tables and users in MongoDB.
When creating a database in MongoDB, the "Use XXX" command is used, so some extra operations are needed before creating the database. Here, you choose to create the table "king", if not, you can use "db.king.drop ()" to delete the table. Click here to get the detailed instruction document of MongoDB, or you can enter "help" for help.
4. Write test code to verify the database connection.
Create a test class TestMongoDB.java.
Parcel? com.report.Tests
Import? org . spring framework . data . MongoDB . core . query . criteria；
Import? org . spring framework . data . MongoDB . core . query . query；
Import? com . report . util . mongoutil；
Public? Class? TestMongoDB？ {
Private? String? Name;
Private? String? Surname;
TestMongoDB (string? Name? String? Last name? ){
This. Name? =? Name;
This last name? =? Surname;
}
Public? String? getFirstName()？ {
Return? Name;
}
Public? Invalid? setFirstName(String？ Name)? {
This. Name? =? Name;
}
Public? String? getLastName()？ {
Return? Surname;
}
Public? Invalid? SetLastName (string? Last name)? {
This last name? =? Surname;
}
Public? Static electricity Invalid? main(String[]？ args){
TestMongoDB？ Testing? =? New? TestMongoDB("John ","Connor ");
MongoUtil.getMongoOperation()。 Insert (test);
TestMongoDB？ Storage? =? MongoUtil.getMongoOperation()。 FindOne (new? Query (Criteria.where("firstName "). is(test.getFirstName())，
testmongodb . class)；
What if? (storage? ! =? Empty)
system . out . println(stored . get first name()？ +? "?" ? +? stored . get last name())；
}
}Eclipse console output information:? John Connor
Verify database records: