嗨，
我在页面上显示图片时遇到问题。 我不知道如何设置显示图片的正确路径。 我使用socket.io并表达。该页面正在 Localhost 服务器
上运行这是我显示图片的代码，但是它不起作用。
img src =“ uploads / images.png”
在服务器端，我做了这个“ app.use（express.static（'public'））;”公开。但这不起作用，有人可以帮助我吗？ 正确的道路是什么？
我的文件夹结构是这个
答案 0 :(得分：0)
服务器端：
var app = require('express')();
var express = require('express');
var upload = require('express-fileupload');
var http = require('http').Server(app);
var io = require('socket.io')(http);
var multer = require('multer');
var fs = require('fs');
app.use(upload());
app.use(express.static('public'));
var users = {};
var allUsers = [];
function actualTime(){
var d = new Date();
return d.toLocaleTimeString();}
http.listen(3000, function(){
console.log('listening on *:3000');
});
app.get('/', function(req, res){
res.sendFile(__dirname + '/index.html');
});
io.on('connection', function(socket){
app.post('/upload',function(req,res){
console.log(req.files);
if(req.files.upfile){
var file = req.files.upfile,
name = file.name,
type = file.mimetype;
var uploadpath = __dirname + '/uploads/' + name;
file.mv(uploadpath,function(err){
if(err){
console.log("File Upload Failed",name,err);
res.send("Error Occured!")
}
else {
console.log("File Uploaded",name);
console.log("guckmal");
io.emit('file', name);
res.send('sasa');
}
});
}
else {
res.send("No File selected !");
res.end();
};
})
socket.on('username', function(data,callback){
if(data in users || data.length<=2){
callback(false);
}else{
callback(true);
socket.nickname = data;
users[socket.nickname] = socket;
// to get a message for all users who are not in the priavte chat
allUsers.push(""+socket.nickname);
for(var test=0; test<allUsers.length;test++){
console.log(allUsers[test]);
users[allUsers[test]].emit('usernames', {list:Object.keys(users), nick: allUsers[test]});
}
io.emit('chat message',{msg:"joined the Chatroom", nick:socket.nickname, time:actualTime()});
}
});
socket.on('chat message', function(data, callback){
console.log(socket.nickname);
console.log('User: ' + socket.nickname + ' message: ' + data);
var msg = data.trim();
if(msg.substr(0,3)=== '/w '){
console.log("private chat");
msg= msg.substr(3);
var temp = msg.indexOf(' ');
if(temp !== -1){
console.log("private chat stap 2");
var name = msg.substring(0,temp);
var msg = msg.substring(temp+1);
if(name in users){
console.log("private chat stap 3");
users[name].emit('private chat', {msg:msg, nick:socket.nickname, time:actualTime()});
for(var i=0; i<allUsers.length;i++){
if((name !==allUsers[i])){
if(allUsers[i] !== socket.nickname){
users[allUsers[i]].emit('private chat',{msg:"private message was send from "+socket.nickname+" to "+name, nick:socket.nickname, time:actualTime()});
}else{
users[socket.nickname].emit('private chat',{msg:"you send a private messgae to "+name, nick:"chat", time:actualTime()});
}
}
}
}else{
callback(' user name doesnt exist');
}
}else{
callback('Error! Please enter a message');
}
}else{
io.emit('chat message', {msg:msg, nick:socket.nickname, time:actualTime()});
}
});
socket.on('disconnect', function(data){
delete users[socket.nickname];
io.emit('chat message',{msg:"leaved the Chatroom", nick:socket.nickname, time:actualTime()});
io.sockets.emit('usernames', {list:Object.keys(users)});
});
});
客户端：
$(function () {
var socket = io();
$('#loginForm').submit(function(e){
e.preventDefault(); // prevents page reloading
socket.emit('username', $('#u').val(), function(data,callback){
if(data){
$('#nickWrap').hide();
$('#contentWrap').show();
}else if(($('#u').val()).length<=2){
document.getElementById("u").value="";
document.getElementById("u").placeholder ="Sorry but Username length is less then three :(";
}else{
document.getElementById("u").value="";
document.getElementById("u").placeholder ="Sorry but Username already taken :(";
}
});
});
$('#chatForm').submit(function(e){
e.preventDefault(); // prevents page reloading
if(privateUsers.length>0){
for(var i=0;i<privateUsers.length;i++){
socket.emit('chat message','/w '+ privateUsers[i] +' '+ $('#m').val(), function(data){
// add stuff later
$('#messages').append($('<li>').text(data.time + " " + data.nick +': '+ data.msg ));
});
}
}else{
socket.emit('chat message', $('#m').val(), function(data){
// add stuff later
$('#messages').append($('<li>').text(data.time + " " + data.nick+': '+ data.msg ));
});
}
$('#m').val('');
return false;
});
socket.on('chat message', function(data){
$('#messages').append($('<li>').text(data.time + " " + data.nick +': '+ data.msg ));
});
socket.on('file', function(data){
var img = document.getElementById('bild');
images.push[data];
var name = data;
console.log(name);
$('#messages').append('<li><img src="uploads/images.png" />'+ '</li>');
img.setAttribute('src','data:image/jpeg;base64,' + window.btoa(images));
});
socket.on('private chat', function(data){
$('#messages').append($('<li>').text(data.time + " " + data.nick +': '+ data.msg ));
});
socket.on('usernames', function(socket, data){
console.log("2222222222");
// to get a massage for all users who are not in the priavte chat
console.log(socket.nick);
socketName = socket.nick;
});
socket.on('usernames', function(data){
document.getElementById("userList").innerHTML = "";
var temp;
var indexTemp;
var me= "";
var sortData = [];
for(var i=0;i<data.list.length;i++){
if(data.nick === data.list[i]){
indexTemp = i;
/* temp = data.list[i];
indexTemp =i;
data.list[i]= "Ich";*/
me ="My Name: ";
}
}
// sort list
sortData.push(data.list[indexTemp]);
for(var l=0; l<data.list.length;l++){
if(indexTemp !=l){
sortData.push(data.list[l]);
}
}
for(var i =0; i<sortData.length;i++){
if(i==0){
$('#userList').append('<li style="list-style:none "><buttonid="'+sortData[i]+'" onclick='+'"addUsers()"'+
' style="width: 100%; background: rgb(130, 224, 255); border: none; padding:10%; margin-bottom:2%; "'+'>'+"My Name: "+ sortData[i]
+'</button></li>');
//data.list[i]= temp;
}else{
$('#userList').append('<li style="list-style:none "><button id="'+sortData[i]+'" onclick='+'"addUsers(\''+sortData[i]+'\')"'+
' style="width: 100%; background: rgb(130, 224, 255); border: none; padding:10%; margin-bottom:2%; "'+'>'+ sortData[i]
+'</button></li>');
}
}
// }
});
});
function addUsers(name){
if(privateUsers.length==0){
console.log("erstes objekt");
document.getElementById(name).style.background = "rgb(1, 254, 185)";
privateUsers.push(name);
}else{
for(var i=0;i<privateUsers.length;i++){
if(name==privateUsers[i]){
console.log("gel�scht");
document.getElementById(name).style.background = "rgb(130, 224, 255)";
privateUsers.splice(i,1);
return;
}
}
console.log("drinnen");
document.getElementById(name).style.background = "rgb(1, 254, 185)";
privateUsers.push(name);
}
}