4.7 multer文件上传-博客后端Api-NodeJs+Express+Mysql实战

摘要：给上传文件重命名，获取添加后缀名允许最大层文件上传国际化工具类房源附件文件服务文件上传文件文件名相对路径对应值文件大小后面写到前端的时候再说怎么调用

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

在博客系统中会涉及到文件上传，这时候需要用到 multer文件上传

/**
 * 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, //附件相对地址
    absoluteUrl: Sequelize.STRING, //附件绝对地址
    type: Sequelize.STRING(2), //附件类型（1图片、2视频、3音频、4其他文件）
}, {
    freezeTableName: true, // 自定义表名
    tableName: "Attachment",
    timestamps: true, // 添加时间戳属性 (updatedAt, createdAt)
    createdAt: "createDate",// 将createdAt字段改个名
    updatedAt: "updateDate",// 将updatedAt字段改个名
    indexes: [{ // 索引
        type: "UNIQUE",
        method: "BTREE",
        unique: true, //唯一
        fields: ["uuid"],
    }],
});

module.exports = Attachment;

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

module.exports = {
    /**
     * 获取年月
     */
    getYearMonth: function() {
        var fdate = new Date();
        return fdate.getFullYear() + "" + (fdate.getMonth() + 1) + "" + fdate.getDate();
    },
    /**
     * 连接文件存放路径
     * type文件对应类型 比如文章对应article
     * filename 文件名含后缀名
     */
    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;
        }
    },
    /**
     * 处理文件上传
     */
    setFileUpload: function(opts) {
        var that = this;
        var storage = multer.diskStorage({
            //设置上传后文件路径，uploads文件夹会自动创建。
            destination: function(req, file, cb) {
                cb(null, that.createFilePath(opts.pathType))
            },
            //给上传文件重命名，获取添加后缀名
            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, //允许最大
            },
            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"); //国际化
var utils = require("../libs/utils"); //工具类
var Attachment = require("../models/index").Attachment; //房源附件
var fileService = require("../services/file"); //文件服务

module.exports = {
  /**
   * 文件上传
   */
  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, //相对路径
          absoluteUrl: fileService.getFilePath("default", file.filename),
          type: fileService.handlerFileType(file.mimetype), //对应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,
      });
    });
  },
};

后面写到前端的时候再说 怎么ajax fileupload调用