node.js中express模块如何创建服务器和http模块客户端发请求
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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());
}
});
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