mongoDB 实现小文件上传下载

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互联网集市收集整理的这篇技术教程文章主要介绍了mongoDB 实现小文件上传下载，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含3267字，纯文字阅读大概需要5分钟。

内容图文

场景：小文件，　图片上传到ｍｏｎｇｏ　

package com.icil.elsa.monitor.web;

import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import com.icil.elsa.monitor.db.monitor.entity.PictureDO;

@RestController
public class PicrtureController {
    
    
        @Resource(name = "monitorMongoTemplate")
        @Qualifier("monitorMongoTemplate")
        public MongoTemplate mongoTemplates;
    
    @PostMapping("/pic")
    public String  uploadPicture(@RequestParam(value = "pic", required = false) MultipartFile file) throws IOException {
        String originalFilename = file.getOriginalFilename();
        byte[] bytes = file.getBytes();
        PictureDO pictureDO = new PictureDO();
        String pic =  new String(bytes,"UTF-8");
        pictureDO.setName(originalFilename);
        pictureDO.setPic(pic);
        mongoTemplates.insert(pictureDO);
        return "OK";
    }
    
    
    
    @GetMapping("/get")
    public void downLoadPic(HttpServletResponse response, String name) throws UnsupportedEncodingException {
        
        Query query = Query.query(Criteria.where("name").is(name));
        PictureDO pictureDO = mongoTemplates.findOne(query, PictureDO.class);
        String filename=pictureDO.getName();
        try {
            byte[] buf = pictureDO.getPic().getBytes("UTF-8");
            response.reset(); // 非常重要
            // 纯下载方式
            response.setContentType("image/*");
//            response.setContentType("application/x-msdownload");
//                response.setHeader( "Content-type: ", "image/*" );
//                response.setHeader( "Content-Disposition", "image/png" );
//                response.setContentType( "application/octet-stream; charset=utf-8");
//            response.setHeader("Content-Disposition", "attachment; filename=" +filename);
            OutputStream out = response.getOutputStream();
            out.write(buf);
            //clean cache pipe & close
            out.flush();
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        response.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
    }
    
    //纯下载
    @GetMapping("/get1")
    public void downLoadPic1(HttpServletResponse response, String name) throws UnsupportedEncodingException {
        
        Query query = Query.query(Criteria.where("name").is(name));
        PictureDO pictureDO = mongoTemplates.findOne(query, PictureDO.class);
        String filename=pictureDO.getName();
        try {
            byte[] buf = pictureDO.getPic().getBytes("UTF-8");
            response.reset(); // 非常重要
            // 纯下载方式
            response.setContentType("application/x-msdownload");
//            response.setContentType( "application/octet-stream; charset=utf-8");
            response.setHeader("Content-Disposition", "attachment; filename=" +filename);
            OutputStream out = response.getOutputStream();
            out.write(buf);
            //clean cache pipe & close
            out.flush();
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        response.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
    }

    
    
    

}

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