使用GridFsTemplate在Mongo中存取文件
2024-08-26 07:00:26
Maven依赖(还有一些springboot需要的)
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.6.RELEASE</version>
</parent>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-releases</id>
<name>Spring Releases</name>
<url>https://repo.spring.io/libs-release</url>
</repository>
</repositories>
<pluginRepositories>
<pluginRepository>
<id>spring-releases</id>
<name>Spring Releases</name>
<url>https://repo.spring.io/libs-release</url>
</pluginRepository>
</pluginRepositories>
配置GridFsTemplate
import com.mongodb.Mongo;
import com.mongodb.MongoClient;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.PropertySource;
import org.springframework.core.env.Environment;
import org.springframework.data.mongodb.MongoDbFactory;
import org.springframework.data.mongodb.config.AbstractMongoConfiguration;
import org.springframework.data.mongodb.core.SimpleMongoDbFactory;
import org.springframework.data.mongodb.gridfs.GridFsTemplate;
import org.springframework.data.mongodb.repository.config.EnableMongoRepositories;
@Configuration
@EnableMongoRepositories
// 读取配置文件的,通过Environment读取
@PropertySource("classpath:mongo.yml")
public class GridFsConfiguration extends AbstractMongoConfiguration {
@Autowired
Environment env;
@Bean
public GridFsTemplate gridFsTemplate() throws Exception {
return new GridFsTemplate(mongoDbFactory(), mappingMongoConverter());
}
@Override
protected String getDatabaseName() {
return env.getProperty("database");
}
@Override
public Mongo mongo() throws Exception {
return new MongoClient(env.getProperty("host"));
}
@Bean
public MongoDbFactory mongoDbFactory() throws Exception {
return new SimpleMongoDbFactory(new MongoClient(env.getProperty("host"), env.getProperty("port", Integer.class)), getDatabaseName());
}
}
mongo.yml
mongo:
host: 127.0.0.1
port: 27017
database: filecenter
使用GridFsTemplate存取文件
import com.mongodb.gridfs.GridFSDBFile;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.data.mongodb.gridfs.GridFsResource;
import org.springframework.data.mongodb.gridfs.GridFsTemplate;
import org.springframework.test.context.junit4.SpringRunner;
import java.io.File;
import java.io.IOException;
import java.util.List;
import static org.springframework.data.mongodb.core.query.Query.query;
import static org.springframework.data.mongodb.gridfs.GridFsCriteria.whereFilename;
@RunWith(SpringRunner.class)
@SpringBootTest(classes = GridFsConfiguration.class)
public class MongoTest {
@Autowired
GridFsTemplate gridFsTemplate;
// 存文件
@Test
public void storeFileInGridFs() {
Resource file = new ClassPathResource("mongo.yml");
// Resource file = new FileSystemResource("C:\\Users\\Chenggaowei\\Downloads\\Adblock.crx");
try {
gridFsTemplate.store(file.getInputStream(), file.getFilename(), "yml");
} catch (IOException e) {
e.printStackTrace();
}
}
// 下载文件
@Test
public void findFilesInGridFs() throws IOException {
List<GridFSDBFile> result = gridFsTemplate.find(query(whereFilename().is("mongo.yml")));
GridFSDBFile gridFSDBFile = result.get(0);
gridFSDBFile.writeTo(new File("C:\\Users\\Chenggaowei\\Downloads\\" + gridFSDBFile.getFilename()));
}
// 所有文件
@Test
public void readFilesFromGridFs() {
GridFsResource[] txtFiles = gridFsTemplate.getResources("*");
for (GridFsResource txtFile : txtFiles) {
System.out.println(txtFile.getFilename());
}
}
}
参考文献
https://docs.spring.io/spring-data/mongodb/docs/current/reference/html/#gridfs
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