spring+mongodb 文件上传与下载实现

项目需要用的mongodb来存储文件

首先配置在spring配置文件中配置mongodb
1.需要的jar包(maven依赖)

<dependency>    <groupId>org.springframework.data</groupId>     <artifactId>spring-data-mongodb</artifactId>     <version>1.7.0.RELEASE</version> </dependency>

2.spring 配置文件配置 applicationContext-mongodb.xml

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  xmlns:context="http://www.springframework.org/schema/context"  xmlns:mongo="http://www.springframework.org/schema/data/mongo"  xmlns:p="http://www.springframework.org/schema/p"  xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd    http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd    http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd    http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd    http://www.springframework.org/schema/data/mongo http://www.springframework.org/schema/data/mongo/spring-mongo-1.0.xsd">    <!-- ignore-unresolvable 需要配成true 多xml读取配置文件时都需要加上 否则报错 -->    <context:property-placeholder location="classpath:config/mongo.properties" ignore-unresolvable="true" />    <!-- mongo 配置start -->     <!--         connections-per-host: 每个主机答应的连接数（每个主机的连接池大小），当连接池被用光时，会被阻塞住          max-wait-time: 被阻塞线程从连接池获取连接的最长等待时间（ms）         connect-timeout:在建立（打开）套接字连接时的超时时间（ms）         socket-timeout:套接字超时时间;该值会被传递给Socket.setSoTimeout(int)         slave-ok:指明是否答应驱动从次要节点或者奴隶节点读取数据         -->      <mongo:mongo id="mongo" replica-set="${mongo.replicaSet}">          <mongo:options              connections-per-host="${mongo.connectionsPerHost}"              threads-allowed-to-block-for-connection-multiplier="${mongo.threadsAllowedToBlockForConnectionMultiplier}"              connect-timeout="${mongo.connectTimeout}"               max-wait-time="${mongo.maxWaitTime}"              auto-connect-retry="${mongo.autoConnectRetry}"               socket-keep-alive="${mongo.socketKeepAlive}"              socket-timeout="${mongo.socketTimeout}"              slave-ok="${mongo.slaveOk}"              write-number="${mongo.writeNumber}"              write-timeout="${mongo.riteTimeout}"              write-fsync="${mongo.writeFsync}"/>      </mongo:mongo>      <!-- 设置使用的数据库 名-->      <mongo:db-factory id="mongoDbFactory" dbname="file" mongo-ref="mongo"/>      <!-- mongodb的模板 -->      <bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">         <constructor-arg name="mongoDbFactory" ref="mongoDbFactory"/>      </bean>    <!-- mongo 配置end --></beans>

详细配置可参见spring官方配置文件

然后springMvc 上传配置文件配置
1.需要的jar包

<dependency>    <groupId>commons-fileupload</groupId>    <artifactId>commons-fileupload</artifactId>    <version>1.3.1</version></dependency><dependency>    <groupId>org.apache.commons</groupId>    <artifactId>commons-io</artifactId>    <version>1.3.2</version></dependency>

2.springMvc 配置

<!-- 定义文件上传解析器 -->    <bean id="multipartResolver"        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">        <!-- 设定默认编码 -->        <property name="defaultEncoding" value="UTF-8"></property>        <!-- 设定文件上传的最大值5MB，5*1024*1024 -->        <property name="maxUploadSize" value="5242880"></property>    </bean>

上传工具类封装FileUpAndDownLoadService .java

package com.r2cf.interactiveweb.service;import java.io.File;import java.io.IOException;import java.io.OutputStream;import java.math.BigDecimal;import java.util.Date;import java.util.Iterator;import java.util.List;import java.util.Map;import javax.annotation.Resource;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.bson.types.ObjectId;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.data.mongodb.MongoDbFactory;import org.springframework.data.mongodb.core.MongoTemplate;import org.springframework.stereotype.Component;import org.springframework.stereotype.Service;import org.springframework.web.multipart.MultipartFile;import org.springframework.web.multipart.MultipartHttpServletRequest;import com.mongodb.BasicDBObject;import com.mongodb.DB;import com.mongodb.gridfs.GridFS;import com.mongodb.gridfs.GridFSDBFile;import com.mongodb.gridfs.GridFSFile;/** * 文件上传下载工具类 * @author zhangpeng * *//** * @author zhangpeng * */@Servicepublic class FileUpAndDownLoadService {    @Autowired    private MongoTemplate mongoTemplate;    /**     * 获取mongodb数据库文件操作对象     * @return     */    private GridFS getGridFS(){        DB db = mongoTemplate.getDb();        GridFS gridFS= new GridFS(db,"fs");        return gridFS;    }    /**     * 文件上传     * @param request     * @return     * @throws IOException      */    public void upload(HttpServletRequest request,BigDecimal userId) throws IOException{        GridFS gridFS= getGridFS();        GridFSFile file = null;        MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest) request;        Map<String, MultipartFile> fileMap = mRequest.getFileMap();               Iterator<Map.Entry<String, MultipartFile>> it = fileMap.entrySet().iterator();        while(it.hasNext()){            Map.Entry<String, MultipartFile> entry = it.next();            MultipartFile mFile = entry.getValue();//获取文件            file = gridFS.createFile(mFile.getInputStream());// 创建gridfs文件            file.put("filename", mFile.getOriginalFilename());            file.put("userId", userId.toString());            file.put("uploadDate", new Date());            file.put("contentType",mFile.getContentType());            file.save();        }    }    /**     * 查看文件     * @param params k-v 搜索条件      * @return     */    public List<GridFSDBFile> viewFiles(Map<String,String> params){        GridFS gridFS= getGridFS();        BasicDBObject basicDBObject = new BasicDBObject();        for(Map.Entry<String, String> entry:params.entrySet()){            String key= entry.getKey();            String value=entry.getValue();            basicDBObject.append(key, value);        }        List<GridFSDBFile> list = gridFS.find(basicDBObject);        return list;    }    /**     * 文件查看与下载     * @param id 文件唯一标示id     * @param response     * @throws IOException     */    public void downLoad(String id,HttpServletResponse response) throws IOException{        GridFS gridFS= getGridFS();        ObjectId objId = new ObjectId(id);        GridFSDBFile gridFSDBFile =(GridFSDBFile)gridFS.findOne(objId);        if (gridFSDBFile != null) {            OutputStream sos = response.getOutputStream();            response.setContentType("application/octet-stream");            // 获取原文件名            String name = (String) gridFSDBFile.get("filename");            String fileName = new String(name.getBytes("utf-8"), "ISO8859-1");            // 设置下载文件名            response.addHeader("Content-Disposition", "attachment; filename=\""                    + fileName + "\"");            // 向客户端输出文件            gridFSDBFile.writeTo(sos);            sos.flush();            sos.close();        }    }    /**     * 单文件删除     * @param id 文件唯一标识     * @return     */    public String delete(String id){        GridFS gridFS= getGridFS();        ObjectId objId = new ObjectId(id);        gridFS.remove(objId);        return "success";    }}