springboot集成mongodb，实现文件上传下载

一、linux上安装mongodb

1、下载安装包：https://www.mongodb.com/download-center#atlas，上传包mongodb-linux-x86_64-rhel70-3.6.5.tgz到服务器

2、创建mongodb文件夹，作为安装目标文件夹

  cd /usr/local;mkdir mongodb

3、解压，移动解压缩后的文件夹下的所有文件到mongodb文件夹下

  tar -zxvf mongodb-linux-x86_64-rhel70-3.6.5.tgz;

  cd mongodb-linux-x86_64-rhel70-3.6.5;

  mv * /usr/local/mongodb

4、创建data/db文件夹存放数据，创建logs文件夹存放日志

  cd /usr/local/mongodb;

  mkdir -p data/db;

  mkdir logs;

5、创建配置文件

  cd /usr/local/mongodb/bin;

  vim mongodb.conf

加入以下内容：

dbpath = /usr/local/mongodb/data/db   
logpath = /usr/local/mongodb/logs/mongodb.log  
port = 27017   
fork = true

bind_ip = 192.168.2.182,127.0.0.1 #多个ip的配置方式

6、启动MongoDB服务

  cd /usr/local/mongodb/bin;

  ./mongod -f mongodb.conf #加载配置文件 

7、客户端访问

  ./mongo

  use wx_applet #创建数据库

  show dbs

  可以看到，我们刚创建的数据库不在数据库的列表中， 要显示它，我们需要向数据库插入一些数据

db.wx_applet.insert({"name":"yangfeng"})

二、springboot整合mongodb，实现文件的上传下载

1、pom.xml文件中加入：

2、application.properties中加入：

格式：

spring.data.mongodb.uri=mongodb://username:[email protected]:port/database

3、这里以文件上传到mongodb来做简单的示例

package com.yangfeng.controller.file;

import com.jp.framework.common.model.ServiceResultHelper;
import com.jp.framework.common.util.Constant;
import com.jp.zpzc.entity.customized.FileInfoAO;
import com.jp.zpzc.entity.customized.UserAO;
import com.mongodb.gridfs.GridFSDBFile;
import com.mongodb.gridfs.GridFSFile;
import org.apache.shiro.SecurityUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.data.mongodb.gridfs.GridFsTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
import java.io.InputStream;


/**
 * 文件上传下载
 *
 * @author yangfeng
 * @date 2018-06-04 12:57
 **/
@Controller
@RequestMapping("/file")
public class FileController {


    // 获得SpringBoot提供的mongodb的GridFS对象
    @Autowired
    private GridFsTemplate gridFsTemplate;


    /**
     * 文件上传
     *
     * @param request
     * @return
     */
    @RequestMapping(value = "/uploadFile", method = RequestMethod.POST)
    @ResponseBody
    public Object uploadFile(HttpServletRequest request) throws Exception {
        UserAO user = (UserAO) SecurityUtils.getSubject().getPrincipal();
        Part part = request.getPart("file");
        // 获得提交的文件名
        String fileName = part.getSubmittedFileName();
        // 获得文件输入流
        InputStream ins = part.getInputStream();
        // 获得文件类型
        String contentType = part.getContentType();
        // 将文件存储到mongodb中,mongodb 将会返回这个文件的具体信息
        GridFSFile gridFSFile = gridFsTemplate.store(ins, fileName, contentType);
        FileInfoAO fileInfo = new FileInfoAO();
        fileInfo.setContentType(contentType);
        fileInfo.setFileName(fileName);
        fileInfo.setLastUpdateBy(user != null ? user.getId() : null);
        fileInfo.setMongoFileId(gridFSFile.getId().toString());
        return ServiceResultHelper.genResultWithSuccess(fileInfo);
    }

    /**
     * 下载
     *
     * @param fileId   文件id
     * @param response
     * @return
     */
    @RequestMapping(value = "/downloadFile")
    public void downloadFile(@RequestParam(name = "file_id") String fileId, HttpServletRequest request, HttpServletResponse response) throws Exception {
        Query query = Query.query(Criteria.where("_id").is(fileId));
        // 查询单个文件
        GridFSDBFile gfsfile = gridFsTemplate.findOne(query);
        if (gfsfile == null) {
            return;
        }
        String fileName = gfsfile.getFilename().replace(",", "");
        //处理中文文件名乱码
        if (request.getHeader("User-Agent").toUpperCase().contains("MSIE") ||
                request.getHeader("User-Agent").toUpperCase().contains("TRIDENT")
                || request.getHeader("User-Agent").toUpperCase().contains("EDGE")) {
            fileName = java.net.URLEncoder.encode(fileName, "UTF-8");
        } else {
            //非IE浏览器的处理：
            fileName = new String(fileName.getBytes("UTF-8"), "ISO-8859-1");
        }
        // 通知浏览器进行文件下载
        response.setContentType(gfsfile.getContentType());
        response.setHeader("Content-Disposition", "attachment;filename=\"" + fileName + "\"");
        gfsfile.writeTo(response.getOutputStream());
    }

    /**
     * 删除文件
     *
     * @param fileId
     * @return
     */
    @RequestMapping(value = "/deleteFile", method = RequestMethod.POST)
    @ResponseBody
    public Object deleteFile(@RequestParam(name = "file_id") String fileId) {
        Query query = Query.query(Criteria.where("_id").is(fileId));
        // 查询单个文件
        GridFSDBFile gfsfile = gridFsTemplate.findOne(query);
        if (gfsfile == null) {
            return ServiceResultHelper.genResultWithFaild(Constant.ErrorCode.FILE_NOT_EXIST_ERROR_MSG, Constant.ErrorCode.FILE_NOT_EXIST_ERROR);
        }
        gridFsTemplate.delete(query);
        return ServiceResultHelper.genResultWithSuccess();
    }
}