node11---相册-阿里云开发者社区

app.js

/*
littleAlbum
    --.idea
    --controller（控制层相当于action层）
        --package.json
        --router.js
    --models（做事的是model层相当于dao层）
        --file.js
    --node_modules（引入的其他模块）
    --public（静态资源）
        --css
            --bootstrap.css
        --fonts
            --glyphicons-halflings-regular.ttf
        --images
            --404.jpg
        --js
            --npm.js
            --jquery-1.11.3.min.js
            --bootstrap.js
    --tempup
    --uploads（上传的文件）
    --views（View层，数据通过ejs模版注入）
        --album.ejs
        --err.ejs
        --index.ejs
        --up.ejs
    --app.js
    --package.json
*/

var express = require("express");
var app = express();
//控制器
var router = require("./controller");//引入的是文件夹，文件夹里面要有index.js或者package.json文件里面的入口js文件。

//设置模板引擎
app.set("view engine", "ejs");

//路由中间件，网址正好匹配上了public下面的文件（全路径匹配），就直接返回。匹配不上就向下路由，
app.use(express.static("./public"));//静态页面，静态页面里面的资源路径如果与app.get()里面的路径重复，就只走这里。资源图片cssjs都是在public文件夹，页面都是在views文件夹。

//网址正好匹配上了uploads下面的文件（全路径匹配），就直接返回。
app.use(express.static("./uploads"));

//上面匹配了就停止，上面没有匹配上，就跑到下面来匹配，首页
app.get("/", router.showIndex);

app.get("/:albumName", router.showAlbum);

app.get("/up", router.showUp);

app.post("/up", router.doPost);
console.log(6);

//404，上面都没有匹配到就404页面
app.use(function (req, res) {
    res.render("err");
});

app.listen(3000);

router.js

/**
 * Created by Danny on 2015/9/22 15:30.
 */
var file = require("../models/file.js");
var formidable = require('formidable');
var path = require("path");
var fs = require("fs");
var sd = require("silly-datetime");

//首页
exports.showIndex = function(req,res,next){
    console.log(1);
    /*    错误的：传统思维，不是node的思维：
    res.render("index",{
        "albums" : file.getAllAlbums() getAllAlbums里面是异步的，不能这么写，只能等这个异步执行完才行，就用回调函数
    });    */

    //这就是Node.js的编程思维，就是所有的东西，都是异步的
    //file函数的返回值通过回调函数实现。
    file.getAllAlbums(function(err,allAlabums){//实参回调函数的定义
        //err是字符串
        if(err){
            next(); //交给下面适合他的中间件
            return;
        }
        res.render("index",{
            "albums" : allAlabums
        });
    })
}

//相册页
exports.showAlbum = function(req,res,next){
    console.log(2);
    //遍历相册中的所有图片
    var albumName = req.params.albumName;
    //具体业务交给model
    file.getAllImagesByAlbumName(albumName,function(err,imagesArray){
        if(err){
            next(); //交给下面的中间件
            return;
        }
        res.render("album",{
            "albumname" : albumName,
            "images" : imagesArray
        });
    });
};

//显示上传
exports.showUp = function(req,res){//中间件有req、res
    console.log(3);
    //命令file模块（我们自己写的函数）调用getAllAlbums函数
    //得到所有文件夹名字之后做的事情，写在回调函数里面
    file.getAllAlbums( function(err,albums){res.render("up",{albums : albums} );
    });
};

//上传表单
exports.doPost = function(req,res){
    console.log(4);
    var form = new formidable.IncomingForm();

    form.uploadDir = path.normalize(__dirname + "/../tempup/");// '../表示向上回溯一级'

    form.parse(req, function(err, fields, files,next) {
        console.log(fields);
        console.log(files);
        //改名
        if(err){
            next();     //这个中间件不受理这个请求了，往下走
            return;
        }
        //判断文件尺寸
        var size = parseInt(files.tupian.size);
        if(size > 2000){
            res.send("图片尺寸应该小于1M");
            //删除图片
            fs.unlink(files.tupian.path);
            return;
        }

        var ttt = sd.format(new Date(), 'YYYYMMDDHHmmss');
        var ran = parseInt(Math.random() * 89999 + 10000);
        var extname = path.extname(files.tupian.name);

        var wenjianjia = fields.wenjianjia;
        var oldpath = files.tupian.path ;
        var newpath = path.normalize(__dirname + "/../uploads/" + wenjianjia + "/" + ttt + ran + extname);
        fs.rename(oldpath,newpath,function(err){
            if(err){
                res.send("改名失败");
                return;
            }
            res.send("成功");
        });
    });
    return;
}

file.js

/**
 * Created by Danny on 2015/9/22 16:32.
 */
var fs = require("fs");

//这个函数的callback中含有两个参数，一个是err
//另一个是存放所有文件夹名字的array。
exports.getAllAlbums = function(callback){
    fs.readdir("./uploads",function(err,files){
        if(err){
            callback("没有找到uploads文件",null);
        }
        var allAlbums = [];
        (function iterator(i){
            if(i == files.length){
                //遍历结束，这个线程执行完毕，
                console.log(allAlbums);
                callback(null,allAlbums);//这个线程执行完毕调用回调函数。
                return;
            }
            fs.stat("./uploads/" + files[i],function(err,stats){
                if(err){
                    callback("找不到文件" + files[i] , null);
                }
                if(stats.isDirectory()){
                    allAlbums.push(files[i]);
                }
                iterator(i + 1);
            });
        })(0);
    });
}

//通过文件名，得到所有图片
exports.getAllImagesByAlbumName = function(albumName,callback){
    fs.readdir("./uploads/" + albumName,function(err,files){
        if(err){
            callback("没有找到uploads文件",null);
            return;
        }
        var allImages = [];
        (function iterator(i){
            if(i == files.length){
                //遍历结束
                console.log(allImages);
                callback(null,allImages);
                return;
            }
            fs.stat("./uploads/" + albumName + "/" + files[i],function(err,stats){
                if(err){
                    callback("找不到文件" + files[i] , null);
                    return;
                }
                if(stats.isFile()){
                    allImages.push(files[i]);
                }
                iterator(i + 1);
            });
        })(0);
    });
}

albm.ejs

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>小小相册</title>
    <link href="/css/bootstrap.min.css" rel="stylesheet">
    <style type="text/css">
        .row h4{
            text-align: center;
        }
    </style>
</head>
<body>
<nav class="navbar navbar-default">
    <div class="container-fluid">
        <!-- Brand and toggle get grouped for better mobile display -->
        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand" href="#">小小相册</a>
        </div>

        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
            <ul class="nav navbar-nav">
                <li><a href="/">全部相册<span class="sr-only">(current)</span></a></li>
                <li><a href="/up">上传</a></li>
            </ul>
        </div><!-- /.navbar-collapse -->
    </div><!-- /.container-fluid -->
</nav>

    <div class="container">
        <ol class="breadcrumb">
            <li><a href="/">全部相册</a></li>
            <li class="active"><%=albumname%></li>
        </ol>

        <div class="row">
            <% for(var i = 0 ; i < images.length ; i++){ %>
                <div class="col-xs-6 col-md-3">
                    <a href="#" class="thumbnail">
                        <img src="<%=images[i]%>" alt="...">
                    </a>
                    <h4> </h4>
                </div>
            <%}%>
        </div>
    </div>

    <script src="/js/jquery-1.11.3.min.js"></script>
    <script src="/js/bootstrap.min.js"></script>
</body>
</html>

err.ejs

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>小小相册</title>
    <link href="/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<nav class="navbar navbar-default">
    <div class="container-fluid">
        <!-- Brand and toggle get grouped for better mobile display -->
        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand" href="#">小小相册</a>
        </div>

        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
            <ul class="nav navbar-nav">
                <li><a href="#">全部相册<span class="sr-only">(current)</span></a></li>
                <li><a href="#">上传</a></li>
            </ul>
        </div><!-- /.navbar-collapse -->
    </div><!-- /.container-fluid -->
</nav>

    <div class="container">
        <img src="/images/404.jpg" alt=""/>
    </div>

    <script src="/js/jquery-1.11.3.min.js"></script>
    <script src="/js/bootstrap.min.js"></script>
</body>
</html>

up.ejs

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>小小相册</title>
    <link href="/css/bootstrap.min.css" rel="stylesheet">
</head>
<body>
<nav class="navbar navbar-default">
    <div class="container-fluid">
        <!-- Brand and toggle get grouped for better mobile display -->
        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand" href="#">小小相册</a>
        </div>

        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
            <ul class="nav navbar-nav">
                <li><a href="#">全部相册<span class="sr-only">(current)</span></a></li>
                <li><a href="#">上传</a></li>
            </ul>
        </div><!-- /.navbar-collapse -->
    </div><!-- /.container-fluid -->
</nav>

    <div class="container">
        <div class="row">
            <form style="width:40%;" method="post" action="#" enctype="multipart/form-data">
                <div class="form-group">
                    <label for="exampleInputEmail1">选择文件夹</label>
                    <select class="form-control" name="wenjianjia">
                        <% for(var i = 0 ; i < albums.length ; i++){%>
                            <option><%= albums[i] %></option>
                        <%}%>
                    </select>
                 </div>

                <div class="form-group">
                    <label for="exampleInputFile">选择图片</label>
                    <p>尺寸小于2M</p>
                    <input type="file" id="exampleInputFile"  name="tupian">
                 </div>

                <button type="submit" class="btn btn-default">上传</button>
            </form>
        </div>
    </div>

    <script src="/js/jquery-1.11.3.min.js"></script>
    <script src="/js/bootstrap.min.js"></script>
</body>
</html>

index.ejs

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>小小相册</title>
    <link href="css/bootstrap.min.css" rel="stylesheet">
    <style type="text/css">
        .row h4{
            text-align: center;
        }
    </style>
</head>
<body>
<nav class="navbar navbar-default">
    <div class="container-fluid">
        <!-- Brand and toggle get grouped for better mobile display -->
        <div class="navbar-header">
            <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand" href="#">小小相册</a>
        </div>

        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
            <ul class="nav navbar-nav">
                <li class="active"><a href="/">全部相册<span class="sr-only">(current)</span></a></li>
                <li><a href="/up">上传</a></li>
            </ul>
        </div><!-- /.navbar-collapse -->
    </div><!-- /.container-fluid -->
</nav>

    <div class="container">
        <div class="row">
            <% for(var i = 0 ; i < albums.length ; i++){ %>
                <div class="col-xs-6 col-md-3">
                    <a href="<%= albums[i] %>" class="thumbnail">
                        <img src="images/wjj.jpg" alt="...">
                    </a>
                    <h4><%= albums[i] %></h4>
                </div>
            <% } %>
        </div>
    </div>

    <script src="js/jquery-1.11.3.min.js"></script>
    <script src="js/bootstrap.min.js"></script>
</body>
</html>