从零开始学习Node.js例子二 文本提交与显示

时间:2014-04-03 19:22:12   收藏:0   阅读:544

 

index.js

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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;

server.start(router.route, handle);
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server.js

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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.");

    request.setEncoding("utf8");

    request.addListener("data", function(postDataChunk) {
      postData += postDataChunk;
      console.log("Received POST data chunk ‘"+
      postDataChunk + "‘.");
    });

    request.addListener("end", function() {
      console.log("data received ending" + pathname);
      route(handle, pathname, response, postData);
    });
  }

  http.createServer(onRequest).listen(8888);
  console.log("Server has started.");
}

exports.start = start;
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requestHandlers.js

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var querystring = require("querystring");

function start(response, postData) {
  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" method="post">‘+
    ‘<textarea name="text" rows="20" cols="60"></textarea>‘+
    ‘<input type="submit" value="Submit text" />‘+
    ‘</form>‘+
    ‘</body>‘+
    ‘</html>‘;

    response.writeHead(200, {"Content-Type": "text/html"});
    response.write(body);
    response.end();
}

function upload(response, postData) {
  console.log("Request handler ‘upload‘ was called.");
  response.writeHead(200, {"Content-Type": "text/plain"});
  response.write("You‘ve sent the text: "+
  querystring.parse(postData).text);
  response.end();
}

exports.start = start;
exports.upload = upload;
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router.js

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function route(handle, pathname, response, postData) {
  console.log("About to route a request for " + pathname);
  if (typeof handle[pathname] === ‘function‘) {
    handle[pathname](response, postData);
  } 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;
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result:

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知识点:

require和exports的用法:

index.js中代码

var Hello = require(‘.hello‘);

hello = new Hello();
hello.setName(‘Joey‘);
hello.sayHello();

hello.js中代码

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function Hello(){
    var name;

    this.setName = function(thyName){
        name = thyName;
    }

    this.sayHello = function(){
        console.log(‘Hello ‘ + name);
    }
}

//exports.Hello = Hello;  //此时我们在其他文件中需要通过 require(‘./hello‘).Hello来获取Hello对象,这种写法有点冗余
module.exports = Hello; //输出的就是Hello对象本身,不是上面的exports,上面的是暴露.Hello,.Hello赋予了Hello对象
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从零开始学习Node.js例子二 文本提交与显示,布布扣,bubuko.com

原文:http://www.cnblogs.com/EricaMIN1987_IT/p/3640134.html

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