MongoDB分布式存储GridFS

MongoDB分布式存储GridFS

项目结构图

配置文件

1. pom.xml

   
   <dependency>
     <groupId>org.springframework.bootgroupId>
     <artifactId>spring-boot-starter-data-mongodbartifactId>
   dependency>
   

2. application.yml

   server:
     port: 31001
   spring:
     application:
       name: xc‐service‐manage‐cms
     # MongoDB配置
     data:
       mongodb:
         uri: mongodb://root:123@localhost:27017
         database: xc_cms
     # freemarker模板配置
     freemarker:
       cache: false # 关闭模板缓存, 方便测试
       settings:
         template_update_delay: 0 # 立即刷新
     # rabbitmq配置
     rabbitmq:
       host: 127.0.0.1
       port: 5672
       username: guest
       password: guest
       virtual-host: /
   
   

配置类

1. MongoConfig

   package com.xuecheng.manage_cms.config;
   
   import com.mongodb.MongoClient;
   import com.mongodb.client.MongoDatabase;
   import com.mongodb.client.gridfs.GridFSBucket;
   import com.mongodb.client.gridfs.GridFSBuckets;
   import org.springframework.beans.factory.annotation.Value;
   import org.springframework.context.annotation.Bean;
   import org.springframework.context.annotation.Configuration;
   
   /**
    * @Author: 潇哥
    * @DateTime: 2020/11/2 下午5:25
    * @Description: GridFSBucket用于打开下载流对象
    */
   @Configuration
   public class MongoConfig {
   
       // 把application.yml中的配置信息赋值给db
       @Value("${spring.data.mongodb.database}")
       private String db;
   
       @Bean
       public GridFSBucket getGridFSBucket(MongoClient mongoClient) {
           // 获取数据库
           MongoDatabase mongoDatabase = mongoClient.getDatabase(db);
   
           // 获取打开下载流
           GridFSBucket gridFSBucket = GridFSBuckets.create(mongoDatabase);
          // 指定数据库下的集合
          // GridFSBucket gridFSBucket = GridFSBuckets.create(mongoDatabase, "集合名称");
           return gridFSBucket;
       }
   
   }
   

测试

1. GridFsTest

   package com.xuecheng.manage_cms;
   
   import com.mongodb.client.gridfs.GridFSBucket;
   import com.mongodb.client.gridfs.GridFSDownloadStream;
   import com.mongodb.client.gridfs.model.GridFSFile;
   import org.apache.commons.io.IOUtils;
   import org.bson.types.ObjectId;
   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.data.mongodb.core.query.Criteria;
   import org.springframework.data.mongodb.core.query.Query;
   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.FileInputStream;
   import java.io.FileNotFoundException;
   import java.io.IOException;
   
   /**
    * @Author: 潇哥
    * @DateTime: 2020/10/18 下午2:43
    * @Description: TODO
    */
   @SpringBootTest // 它会扫描启动类下的所有包, 获取代理对象
   @RunWith(SpringRunner.class)
   public class GridFsTest {
   
   
       @Autowired
       private GridFsTemplate gridFsTemplate;
   
       @Autowired
       private GridFSBucket gridFSBucket;
   
   
       /**
        * 使用MongoDB分布式存储GridFs存文件
        */
       @Test
       public void testStore() throws FileNotFoundException {
           // 要存储的文件
           File file = new File("/Users/xiaoge/IdeaProjects/xcEduService/test-freemarker/src/main/resources/templates/index_banner.ftl");
   
           // 定义输入流
           FileInputStream fileInputStream = new FileInputStream(file);
   
           // 向GridFs存储文件
           ObjectId objectId = gridFsTemplate.store(fileInputStream, "index_banner.ftl");
           // 存储到制定的集合中
          // ObjectId objectId = gridFSBucket.uploadFromStream("index_banner.ftl", fileInputStream);
   
           // 得到文件id
           String fileId = objectId.toString();
   
           System.out.println(fileId);
   
       }
   
   
       /**
        * 使用MongoDB分布式存储GridFs读取文件
        */
       @Test
       public void testQuery() throws IOException {
   
           // 根据id查询文件
           GridFSFile gridFSFile = gridFsTemplate.findOne(Query.query(Criteria.where("_id").is("5f9fcf8cbeed4e02ce629df8")));
   
           // 打开下载流对象
           GridFSDownloadStream gridFSDownloadStream = gridFSBucket.openDownloadStream(gridFSFile.getObjectId());
   
           // 创建gridFsResource，用于获取流对象
           GridFsResource gridFsResource = new GridFsResource(gridFSFile, gridFSDownloadStream);
   
           // 获取文件内容
           String content = IOUtils.toString(gridFsResource.getInputStream(), "utf-8");
   
           System.out.println(content);
   
       }
       
        /**
        * 根据文件id返回文件内容
        */
       @Test
        public String selectMedicalFileByObjectId(String objectId){
            ByteArrayOutputStream baos = new ByteArrayOutputStream();   
            gridFSBucket.downloadToStream(new ObjectId(objectId), baos);
            result =  baos.toString("UTF-8");
        }
   
       /**
        * 使用MongoDB分布式存储GridFs删除文件
        */
       @Test
       public void testDelete() {
           // 根据文件id删除fs.files和fs.chunks中的记录
           gridFsTemplate.delete(Query.query(Criteria.where("_id").is("5f9fcf8cbeed4e02ce629df8")));
       }
   
   }