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请求路由再将该数据传递给请求处理程序

日期:2019-08-29编辑作者:韦德国际bv1946计算机

实现思路

将data和end事件的回调函数直接放在服务器中,在data事件回调中收集所有的POST数据,当接收到所有数据,触发end事件后,其回调函数调用请求路由,并将数据传递给它,然后,请求路由再将该数据传递给请求处理程序。

实现步骤

第一步我们设置了接收数据的编码格式为UTF-8,第二步注册了“data”事件的监听器,用于收集每次接收到的新数据块,并将其赋值给postData 变量,最后第三步我们将请求路由的调用移到end事件处理程序中,以确保它只会当所有数据接收完毕后才触发,并且只触发一次。我们同时还把POST数据传递给请求路由

示例代码

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; 

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."); 

   request.setEncoding("utf8"); 

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

  request.addListener("end", function() { 
   route(handle, pathname, response, postData); 
  }); 
    //route(handle,pathname,response); 

  //response.writeHead(200, {"Content-Type": "text/plain"}); 
  //response.write("this is a demo"); 
  //response.end(); 
 } 

 http.createServer(onRequest).listen(5656,'127.0.0.1'); 
 console.log("Server has started. localhost:5656"); 
} 

exports.start = start;

router.js

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; 

requestHandlers.js

//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: "   postData); 
 response.end(); 
} 

exports.start = start; 
exports.upload = upload; 

运行:node mynode/index

浏览器输入http://localhost:5656/

图片 1

结果:

图片 2

在文本框里输入“I LOVE YOU” 点击提交

图片 3

图片 4

使用querystring模块只提取文本,修改一下requestHandlers.js使只返回文本

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: "   querystring.parse(postData).text); 
 response.end(); 
} 

exports.start = start; 
exports.upload = upload; 

重新启动,依旧输入I LOVE YOU ,提交

图片 5

总结

以上就是这篇文章的全部内容了,希望这篇文章的内容对大家的学习或者工作带来一定的帮助,如果有疑问大家可以留言交流。

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