如何使用spring-data和java在MongoDB中存储包含File对象的对象

Question

您好我有一个名为Outbox的课程，如下所示：

@Document(collection="outbox")
public class OutBox {

    private String fileName;
    private String id;
    private String userName;
    private File file;


    public OutBox(String fileName,String userName,File file){
        this.fileName = fileName;
        this.userName = userName;
        this.file = file;
    }

    public OutBox(String id,String fileName){
        this.id = id;
        this.fileName = fileName;
    }

    public String getFileName() {
        return fileName;
    }
    public void setFileName(String fileName) {
        this.fileName = fileName;
    }
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getUserName() {
        return userName;
    }
    public void setUserName(String userName) {
        this.userName = userName;
    }

    public File getFile() {
        return file;
    }

    public void setFile(File file) {
        this.file = file;
    }

}

我的outbox类里面有File。我知道可以使用GRIDFS将文件存储在mongoDB中。但是如何存储其中包含File的对象..请帮助。