Node.js入门 读完本书之后，你将完成一个完整的web应用，该应用允许用户浏览页面以及上传文件。
里面对一些知识的讲解，让你略窥Node.js的门径。最好一段代码一段代码的写下来，我的习惯是手里拿着笔，边写重点的词，边思索，再敲敲代码。一天到两天你能看完这本书，我看过一遍了，计划再寻摸一遍。有问题大家可以一起探讨。
四个文件在同一个目录下
启动
cmd窗口：
输入 node D:\workspace\nodejs\index.js
也可以定位到当前目录后：
D:\workspace\nodejs\ node index.js
打开
localhost:8080/start
说下，此书最后的例子完整代码中有点问题。你应该会出现 类似no such file or directory ，或者是此文件已经存在的错误提示。修改处已经做了标注：
具体文件：
index.js
var server=require("./server");
var router=require("./router");
var requestHandlers=require("./requestHandlers");
var handle={};
handle["/"]=requestHandlers.start;
handle["/start"]=requestHandlers.start;
handle["/upload"]=requestHandlers.upload;
handle["/show"]=requestHandlers.show;
server.start(router.route,handle);
server.js
var http = require("http");
var url=require("url");
function start(route,handle){
function onRequest(request,response){
var postData="";
var pathname=url.parse(request.url).pathname;
console.log("Request for"+pathname+" received");
route(handle,pathname,response,request);
}
http.createServer(onRequest).listen(8080);
console.log("Server has started");
}
exports.start=start;
router.js
var http = require("http");
var url=require("url");
function start(route,handle){
function onRequest(request,response){
var postData="";
var pathname=url.parse(request.url).pathname;
console.log("Request for"+pathname+" received");
route(handle,pathname,response,request);
}
http.createServer(onRequest).listen(8080);
console.log("Server has started");
}
exports.start=start;
requestHandler.js
//var exec=require("child_process").exec;
var querystring=require("querystring"),
fs=require("fs"),
formidable=require("formidable");
function start(response){
console.log("start was called");
var body="<!DOCTYPE html>"+
'<head><meta http-equiv="content-type" content="text/html;charset=utf-8" /><title>'+
'这是个测试</title></head><body>'+
'<form action="/upload" enctype="multipart/form-data" method="post">'+
'<input type="file" name="upload" />'+
'<input type="submit" value="Upload file" />'+
'</form>'+'</body></html>';
response.writeHead(200,{"Content-Type":"text/html"});
response.write(body);
response.end();
}
function upload(response,request){
console.log("upload was called");
var form=new formidable.IncomingForm({uploadDir:"tmp"});//Modify
console.log("about to parse");
form.parse(request,function(error,fields,files){
console.log("parsing done");
fs.renameSync(files.upload.path,"tmp/test.jpg");//The Dir,pay attention
response.writeHead(200, {"Content-Type": "text/html"});
response.write("Received image:<br /><img src='/show' />");
response.end();
});
}
function show(response){
console.log("Show was callde");
fs.readFile("tmp/test.jpg","binary",function(error,file){//The Dir,pay attention
if(error){
response.writeHead(500,{"Content-Type":"text/plain"})
response.write(error + "\n");
response.end();
} else {
response.writeHead(200, {"Content-Type": "image/jpeg"});
response.write(file, "binary");
response.end();
}
})
}
exports.start=start;
exports.upload=upload;
exports.show=show;
你可以下载 node.js入门正确示例