mongodb中图片的基本操作

// 存储文件信息

GridFS gridFS = new GridFS(MongoDBUtil.getDB(), "test");

File localFile = new File("d://test.jpg");

GridFSInputFile oneFile = gridFS.createFile(localFile);

oneFile.setFilename("test.jpg");

// 配置文件属性

SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");//设置日期格式

BasicDBObject metadata = new BasicDBObject();

metadata.put("uploadDate", df.format(new Date()));

oneFile.setMetaData(metadata);//添加属性

oneFile.save();//保存文件

// 存储文件信息

GridFS gridFS = new GridFS(MongoDBUtil.getDB(), "test");

// 读取文件

GridFSDBFile outFile = gridFS.findOne(new ObjectId(request.getParameter("id")));

//System.out.println(outFile);

//

GridFS gridFS = new GridFS(MongoDBUtil.getDB(), "test");

//查找条件 

BasicDBObject query = new BasicDBObject("metadata.pkid", "1123");

List<GridFSDBFile> listFiles = gridFS.find(query);

System.out.println(listFiles);

System.out.println(listFiles.size());

    @RequestMapping(value = "/show") 

    public void show(HttpServletRequest request, HttpServletResponse response){

try {

OutputStream out = response.getOutputStream();

response.setContentType("image/jpg");

GridFS gridFS = new GridFS(MongoDBUtil.getDB(), "test");

// 读取文件

GridFSDBFile outFile = gridFS.findOne(new ObjectId(request.getParameter("id")));

//System.out.println(outFile);

if(outFile!=null){

outFile.writeTo(out);

out.flush();

out.close();

}

} catch (Exception e) {

e.printStackTrace();

}

}