Nodejs入门程序

1.读取文件

用fs.readFile()函数读取文件内容。

var fs = require("fs");
var http = require("http");
var server = http.createServer(function(req, res)
{
    res.writeHead(200,{"Content-type":"text/html;charset=UTF-8"});
    fs.readFile("E:/html.txt", function(err,data)
    {    
        if(err) throw err;  
        res.end(data);
    });
})

server.listen(3002, "127.0.0.1");

2.判断文件状态

fs.stat("E:/test.txt",function(err, data){
    console.log(data.isFile());              //true
    console.log(data.isDirectory());         //false
});

3.简单的路由

var http = require("http");
var url = require("url");

var server = http.createServer(function(req, res){
  res.writeHead(200, {"Content-type":"text/html;charset=UTF-8"});
  var userUrl = req.url;
  if(userUrl.substr(0,9) == "/student/")
  {
      var studentId = userUrl.substr(9);
      if(/\d{3}/.test(studentId))
      {
          res.end("student id = " + studentId);
      }
      else
      {
        res.end("student id error! ");
      }
  }  
});

server.listen(3000,"127.0.0.1");

执行结果

http://127.0.0.1:3000/student/126
student id = 126

4.回调函数

var fs = require("fs");
var http = require("http");
var path = require("path");
var url = require("url");

var server = http.createServer(function(req, res)
{   
    fs.readFile("./index.html", function(err, data){
        if(err)
            throw err;
        getMime(".html", function(mime){
            res.writeHead(200,{"Content-type":mime});   
            res.end(data);
        });
        
    });
})

function getMime(extname, callback)
{
    fs.readFile("./mime.json", function(err, data){
        if(err)
            throw err;
        var mimeJson = JSON.parse(data);
        console.log(mimeJson);
        callback(mimeJson[extname]);
    });
}
server.listen(3003, "127.0.0.1");

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