摘要：給上傳文件重命名，獲取添加后綴名允許最大層文件上傳國際化工具類房源附件文件服務(wù)文件上傳文件文件名相對路徑對應(yīng)值文件大小后面寫到前端的時候再說怎么調(diào)用

multer文件上傳 
https://github.com/expressjs/...

在博客系統(tǒng)中會涉及到文件上傳，這時候需要用到 multer文件上傳

/**
 * Attachment附件表
 * @type {[type]}
 */
var Sequelize = require("sequelize");
var Mysql = require("./mysql");

var Attachment = Mysql.define("attachment", {
    uuid: {
        type: Sequelize.UUID,
        allowNull: false,
        primaryKey: true,
        defaultValue: Sequelize.UUIDV1,//Sequelize.UUIDV4
    }, //uuid
    name: Sequelize.STRING, //附件名字
    relativeUrl: Sequelize.STRING, //附件相對地址
    absoluteUrl: Sequelize.STRING, //附件絕對地址
    type: Sequelize.STRING(2), //附件類型（1圖片、2視頻、3音頻、4其他文件）
}, {
    freezeTableName: true, // 自定義表名
    tableName: "Attachment",
    timestamps: true, // 添加時間戳屬性 (updatedAt, createdAt)
    createdAt: "createDate",// 將createdAt字段改個名
    updatedAt: "updateDate",// 將updatedAt字段改個名
    indexes: [{ // 索引
        type: "UNIQUE",
        method: "BTREE",
        unique: true, //唯一
        fields: ["uuid"],
    }],
});

module.exports = Attachment;

/**
 * 文件服務(wù)
 * add by wwj
 * 2019-05-04 12:03:39
 */
var fs = require("fs");
var path = require("path"); //路徑
var uuid = require("node-uuid"); //uuid
var Promise = require("bluebird");
var multer = require("multer"); //文件上傳
var config = require("config-lite"); //配置

module.exports = {
    /**
     * 獲取年月
     */
    getYearMonth: function() {
        var fdate = new Date();
        return fdate.getFullYear() + "" + (fdate.getMonth() + 1) + "" + fdate.getDate();
    },
    /**
     * 連接文件存放路徑
     * type文件對應(yīng)類型 比如文章對應(yīng)article
     * filename 文件名含后綴名
     */
    createFilePath: function(pathType, filename) {
        var that = this;
        var fpath = path.join(__dirname, "../public/attchments", (pathType || "default"), that.getYearMonth());
        if (!fs.existsSync(fpath)) {
            fs.mkdirSync(fpath);
        }
        if (filename) {
            return fpath + "/" + filename;
        } else {
            return fpath;
        }
    },
    /**
     * 處理文件上傳
     */
    setFileUpload: function(opts) {
        var that = this;
        var storage = multer.diskStorage({
            //設(shè)置上傳后文件路徑，uploads文件夾會自動創(chuàng)建。
            destination: function(req, file, cb) {
                cb(null, that.createFilePath(opts.pathType))
            },
            //給上傳文件重命名，獲取添加后綴名
            filename: function(req, file, cb) {
                var fileFormat = file.originalname.split(".");
                // cb(null, file.originalname + "_" + Math.ceil(Math.random()*9) + Date.now() + "." + fileFormat[fileFormat.length - 1]);
                cb(null, uuid() + "." + fileFormat[fileFormat.length - 1]);
            },
        });
        var upload = multer({
            limits: {
                fileSize: config.file.limit.fileSize[opts.pathType] || config.file.limit.fileSize.default, //允許最大
            },
            storage: storage,
        });
        return upload;
    }
}

/**
 * common controllers
 * add by wwj
 * 2016-12-22 17:45:53
 */
var co = require("co");
var Promise = require("bluebird");
var i18n = require("i18n"); //國際化
var utils = require("../libs/utils"); //工具類
var Attachment = require("../models/index").Attachment; //房源附件
var fileService = require("../services/file"); //文件服務(wù)

module.exports = {
  /**
   * 文件上傳
   */
  uploadEnclosure: function(req, res, next) {
    //文件s
    var files = req.files;
    if (!files || !files.length) {
      //err
      utils.handleError({
        response: res,
        error: i18n.__("uploadFileFail"),
      });
      return;
    }
    co(function*() {
      //all
      var fileResult = yield Promise.all(files.map(function(file) {
        return Attachment.create({
          name: file.originalname, //文件名
          relativeUrl: file.filename, //相對路徑
          absoluteUrl: fileService.getFilePath("default", file.filename),
          type: fileService.handlerFileType(file.mimetype), //對應(yīng)int值
          size: file.size, //文件大小
        });
      }));
      //success
      utils.handleJson({
        response: res,
        msg: i18n.__("uploadFileSuccess"),
        result: {
          fileList: fileResult,
        },
      });
    }).catch(function(error) {
      //err
      utils.handleError({
        response: res,
        error: error,
      });
    });
  },
};

后面寫到前端的時候再說 怎么ajax fileupload調(diào)用