最近在看node入门这本书，https://cnodejs.org/getstart
里面是跟随作者完成一个小的demo，书中不免会有遗漏的，下面是我在实现里面最后一个例子时遇到的问题，希望能够帮助其他人。
先来看看整体的代码：
index.js
/**
* Created with IntelliJ IDEA.
* User: Administrator
* Date: 15-4-18
* Time: 下午6:08
* To change this template use File | Settings | File Templates.
*/
var server = require("./server.js");
var router = require("./router.js");
var requestHandlers = require("./requestHandlers");
var handle ={};
handle["/"] = requestHandlers.start;
handle["/start"] = requestHandlers.start;
handle["/upload"] = requestHandlers.upload;
handle["/show"] = requestHandlers.show;
server.start(router,handle);
server.js
/**
* Created with IntelliJ IDEA.
* User: Administrator
* Date: 15-4-18
* Time: 下午5:08
* To change this template use File | Settings | File Templates.
*/
var http = require("http");
var url = require("url");
function start(route,handle){
function onRequest(request,response){
var postData = "";
var path = url.parse(request.url).pathname;
console.log("Request for"+path+" received");
route.route(handle,path,response,request);
/*request.addListener("data",function(postDataChunk){
postData += postDataChunk;
console.log("Receive post data chunk ‘"+postDataChunk+"‘.");
});
request.addListener("end",function(){
route.route(handle,path,response,postData);
});*/
}
http.createServer(onRequest).listen(8888);
console.log("Server has started.");
}
exports.start = start;
router.js
/**
* Created with IntelliJ IDEA.
* User: Administrator
* Date: 15-4-18
* Time: 下午6:49
* To change this template use File | Settings | File Templates.
*/
function route(handle,pathname,response,request){
console.log("About to route a request for"+pathname);
if(typeof handle[pathname] === ‘function‘)
{
handle[pathname](response,request);
} else{
console.log("No request handler found for"+pathname);
response.writeHead(404,{"Content-Type":"text/plain"});
response.write("404 NOT found");
response.end();
}
}
exports.route = route;
requestHandlers.js
/**
* Created with IntelliJ IDEA.
* User: Administrator
* Date: 15-4-18
* Time: 下午8:38
* To change this template use File | Settings | File Templates.
*/
var exec = require("child_process").exec();
var querystring = require("querystring"),
fs = require("fs"),
util = require(‘util‘),
formidable = require("formidable");
function start(response,request)
{
console.log("Request handler ‘start‘ was called");
var body = ‘<html>‘+
‘<head>‘+
‘<meta http-equiv="Content-Type" ‘+
‘content="text/html; charset=UTF-8" />‘+
‘</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("Request handler ‘upload‘ was called");
var form = new formidable.IncomingForm();
console.log("about to parse");
form.parse(request, function(error, fields, files) {
console.log("parsing done");
var readStream = fs.createReadStream(files.upload.path);
var writeStream = fs.createWriteStream("/tmp/test.png");
util.pump(readStream, writeStream, function() {
fs.unlinkSync(files.upload.path);
});
response.writeHead(200, {"Content-Type": "text/html"});
response.write("received image:<br/>");
response.write("<img src=‘/show‘/>");
response.end();
});
}
function show(response,request)
{
console.log("Request handler ‘show‘ was called.");
fs.readFile("/tmp/test.png","binary",function(error,file){
if(error){
response.writeHead(500,{"Content-Type":"text/plain"});
response.write(error+"\n");
response.end();
} else{
response.writeHead(200,{"Content-Type":"image/png"});
response.write(file,"binary");
response.end();
}
});
}
exports.start = start;
exports.upload = upload;
exports.show = show;
接下来来看一下遇到的问题：
1、在使用指令
npm install formidable
你会发现在运行后，控制台会输出
但是在npm（包管理器）并没有找到这个module，运行代码时报错Error: Cannot find module ‘formidable‘，这就是包没有引用到。
解决办法是：
打开cmd，使用cd命令切换到你当前项目所在目录，然后再执行“npm install formidable”，项目目录下面就会生成一个node_modules子目录，里面是安装好了的formidable模块。现在运行你写好的代码， 不会再提示“Cannot find module ‘formidable‘”了。
2、按照书上的运行的时候出现了这个错误：
看报错的原因就是在重命名的时候有问题，原来就是node在跨分区重命名文件，会有权限问题。http://www.crifan.com/node_js_use_fs_renamesync_error_exdev_cross_device_link_not_permitted/作者给出了解决方法。这样就可以完美的运行了。。。
时间： 2024-10-05 17:31:01