mongodb中图片的基本操作

以下是对于图片的一些基本操作：

1、存储图片

// 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

2、根据文件ID读取图片

// 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);

3、根据MetaData属性查找图片

// 
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());

4、显示图片

    @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();
}
}