如何用spring集成mongodb实现文件上传

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首先要把必要的mongoDB需要的jar加进项目中

定义mongoDB的bean

<bean id="mongoClient" class="com.mongodb.MongoClient"><constructor-arg index="0" type="java.lang.String" name="host" value="127.0.0.1" /><constructor-arg index="1" type="int" name="port" value="27017" /></bean>

自定义实现mongodb增删改实体类

<bean id="mongoDB" class="com.test.MongoDB"><property name="mongoClient" ref="mongoClient" /><property name="dbName" value="orcl" /></bean>

定义mongoClient基础类

public class MongoDB {private MongoClient mongoClient;private String dbName;/** * 获取名为dbName数据库 *  * @return */public DB getDB() {return mongoClient.getDB(dbName);}public MongoClient getMongoClient() {return mongoClient;}public void setMongoClient(MongoClient mongoClient) {this.mongoClient = mongoClient;}public String getDbName() {return dbName;}public void setDbName(String dbName) {this.dbName = dbName;}}

定义mongodb操作Dao类

/** * 增 *  * @param bean * @return */public T save(T bean) {String beanJson = JsonUtil.getJSONString(bean);DBCollection collection = mongoDB.getDB().getCollection(clazz.getSimpleName());collection.save((DBObject)JSON.parse(beanJson));return bean;}/** * 删 * @param id */public void remove(String id) {DBCollection collection = mongoDB.getDB().getCollection(clazz.getSimpleName());BasicDBObject doc = new BasicDBObject();doc.put("_id", id);collection.remove(doc);}/** * 改 * @param query * @param newDoc */public void update(BasicDBObject query, BasicDBObject newDoc) {DBCollection collection = mongoDB.getDB().getCollection(clazz.getSimpleName());collection.update(query, newDoc);}

定义保存文件类

/** * 保存文件到MongoDB GridFS *  * @param in- 需要保存文件的输入流 * @param id- 需要保存文件的唯一ID * @param fileName- 需要保存文件的文件名 * @param contentType  - 需要保存文件的文件类型 * @param downloadName - 需要保存文件被下载时的文件名 */public void save(InputStream in, String id, String fileName, String contentType, String downloadName) {GridFS fs = new GridFS(mongoDB.getDB(), this.getClass().getSimpleName());GridFSInputFile fsFile = fs.createFile(in);fsFile.setId(id);fsFile.setFilename(fileName);fsFile.setContentType(contentType);fsFile.put("downloadName", downloadName);fsFile.save();}/** * 从MongoDB GridFS文件系统中删除指定ID的文件 *  * @param id */public void remove(String id) {GridFS fs = new GridFS(mongoDB.getDB(), this.getClass().getSimpleName());BasicDBObject query = new BasicDBObject("_id", id);fs.remove(query);}/** * 从MongoDB GridFS文件系统中批量删除指定ID的文件 * @param ids */public void batchRemove(String... ids) {GridFS fs = new GridFS(mongoDB.getDB(), this.getClass().getSimpleName());for(String id : ids){BasicDBObject query = new BasicDBObject("_id", id);fs.remove(query);}}

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