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());	
	}
});