node.js中express模块创建服务器和http模块客户端发请求

首先下载express模块，命令行输入

npm install express

1.node.js中express模块创建服务端

在js代码同文件位置新建一个文件夹(www_root)，里面存放网页文件等，就可以在浏览器中访问了

var express = require("express");
var path = require("path");
var app = express();
//目录  (当前目录下的www_root目录)
app.use(express.static(path.join(process.cwd(),"www_root")));
//监听
var server = app.listen(6080);
app.get('/', function (req, res) {
  //发送数据
  res.send('hello world ~~~~~~~~~~~~!');
 });
// get, 处理响应
app.get("/login", function (request, respones) {
 console.log("/login comming"); 
 // 服务器收到请求后，获取客户端get操作参数
 console.log(request.query);
 // 服务器回信息给客户端
 respones.send("已连接上服务器~~");
});
app.post("/upload", function(request, respones) {
 console.log("/upload comming");
 // 获得url上传来的参数
 console.log(request.query);
 // 获得用户给我们发送过来的数据
 // 监听我们的data来获得
 request.on("data", function(data) {
 console.log(data.tostring());
 respones.send("upload ok"); 
 });
});

2.http模块客户端发请求

(实例1)http_get测试

var http = require("http");
/*
callback(is_success, data/erro)
*/
function http_get(ip, port, url, params, callback){
  //创建一个http.clientrequest对象
  var options = {
    host : ip,
    port : port,
    path : url+"?"+params,
    method : "get",
  };
  var request = http.request(options,function(incoming_msg){
    console.log("get respones");
  });
  //发送这个请求
  request.end();
}
http_get("127.0.0.1", 6080, "/login", "uname=jadeshu&upw=123456", function(is_ok,data){
});

(实例2)http_get、http_post测试

var http = require("http");
/*
 [100] = "continue",
 [101] = "switching protocols",
 [200] = "ok",
 [201] = "created",
 [202] = "accepted",
 [203] = "non-authoritative information",
 [204] = "no content",
 [205] = "reset content",
 [206] = "partial content",
 [300] = "multiple choices",
 [301] = "moved permanently",
 [302] = "found",
 [303] = "see other",
 [304] = "not modified",
 [305] = "use proxy",
 [307] = "temporary redirect",
 [400] = "bad request",
 [401] = "unauthorized",
 [402] = "payment required",
 [403] = "forbidden",
 [404] = "not found",
 [405] = "method not allowed",
 [406] = "not acceptable",
 [407] = "proxy authentication required",
 [408] = "request time-out",
 [409] = "conflict",
 [410] = "gone",
 [411] = "length required",
 [412] = "precondition failed",
 [413] = "request entity too large",
 [414] = "request-uri too large",
 [415] = "unsupported media type",
 [416] = "requested range not satisfiable",
 [417] = "expectation failed",
 [500] = "internal server error",
 [501] = "not implemented",
 [502] = "bad gateway",
 [503] = "service unavailable",
 [504] = "gateway time-out",
 [505] = "http version not supported",
}
*/
/*
callback(is_success, data/erro)
*/
// get请求的参数，是带在url的地址上面的
function http_get(ip, port, url, params, callback) {
 // step1,创建一个 http.clientrequest
 var options = {
 host: "127.0.0.1",
 port: port,
 path: url + "?" + params,
 method: "get"
 };
 // 当有请求返回的时候，参数就会被传递为http.incomingmessage
 var req = http.request(options, function(incoming_msg) {
 console.log("respones status " + incoming_msg.statuscode);
 // 监听incomingmessage的data事件，当收到服务器发过来的数据的时候，触发这个事件
 incoming_msg.on("data", function(data) {
  if (incoming_msg.statuscode === 200) {
  callback(true, data);
  }
 });
 });
 // 把这个请求发送出去
 req.end();
}
/*
http_get("127.0.0.1", 6080, "/login", "uname=blake&upwd=123456", function(is_ok, data) {
 if (is_ok) {
 console.log(data.tostring());
 }
});
*/
// post可以带body数据传到服务器
function http_post(ip, port, url, params, body, callback) {
 // step1,创建一个 http.clientrequest
 var options = {
 host: "127.0.0.1",
 port: port,
 path: url + "?" + params,
 method: "post",
 headers: {
  "content-type": "application/x-www-form-urlencoded",
  "content-length": body.length
 }
 };
 var req = http.request(options, function(incoming_msg) {
 console.log("respones status " + incoming_msg.statuscode);
 // 监听incomingmessage的data事件，当收到服务器发过来的数据的时候，触发这个事件
 incoming_msg.on("data", function(data) {
  if (incoming_msg.statuscode === 200) {
  callback(true, data);
  }
 });
 });
 // step2 写入body数据
 req.write(body);
 // 发送请求
 req.end();
}
http_post("127.0.0.1", 6080, "/upload", "filename=my_file.txt", "hello htpp post", function(is_ok, data) {
 if (is_ok) {
 console.log("upload_success", data.tostring()); 
 }
});

总结

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