Node.js 处理get和post请求参数

/*
    get参数处理-url核心模块
*/
const url = require(‘url‘);
// --------------parse方法的作用就是把URL字符串转化为对象-----------
let str = ‘http://www.baidu.com/abc/qqq?flag=123&keyword=java‘;
let ret = url.parse(str,true);
console.log(ret.query.keyword); // 获取变量名为keyword的值
 
// ------format的作用就是把对象转化为标准的URL字符串------
let obj = {
  protocol: ‘http:‘,
  slashes: true,
  auth: null,
  host: ‘www.baidu.com‘,
  port: null,
  hostname: ‘www.baidu.com‘,
  hash: null,
  search: ‘?flag=123&keyword=java‘,
  query: ‘flag=123&keyword=java‘,
  pathname: ‘/abc/qqq‘,
  path: ‘/abc/qqq?flag=123&keyword=java‘,
  href: ‘http://www.baidu.com/abc/qqq?flag=123&keyword=java‘
};
let ret1 = url.format(obj);
console.log(ret1);

/*
    post参数处理
*/
const querystring = require(‘querystring‘);
const http = require(‘http‘);
 
// parse方法的作用就是把字符串转成对象
let param = ‘username=lisi&password=123‘;
let obj = querystring.parse(param);
console.log(obj);
// stringify的作用就是把对象转成字符串
let obj1 = {
    flag : ‘123‘,
    abc : [‘hello‘,‘hi‘]
}
let str1 = querystring.stringify(obj1);
console.log(str1);
 
http.createServer((req,res)=>{
    if(req.url.startsWith(‘/login‘)){
        let pdata = ‘‘;
        req.on(‘data‘,(chunk)=>{
            // 每次获取一部分数据
            pdata += chunk;
        });
 
        req.on(‘end‘,()=>{
            // 这里才能得到完整的数据
            console.log(pdata);
            let obj = querystring.parse(pdata);
            res.end(obj.username+‘-----‘+obj.password);
        });
    }
}).listen(3000,()=>{
    console.log(‘running...‘);
})

/*
    登录验证功能
*/
const http = require(‘http‘);
const url = require(‘url‘);
const querystring = require(‘querystring‘);
const ss = require(‘./06.js‘);
 
http.createServer((req,res)=>{
    // 启动静态资源服务
    if(req.url.startsWith(‘/www‘)){
        ss.staticServer(req,res,__dirname);
    }
    console.log(req.url);
    // 动态资源
    if(req.url.startsWith(‘/login‘)){
        // get请求
        if(req.method == ‘GET‘){
            let param = url.parse(req.url,true).query;
            if(param.username == ‘admin‘ && param.password == ‘123‘){
                res.end(‘get success‘);
            }else{
                res.end(‘get failure‘);
            }
        }
        // post请求
        if(req.method == ‘POST‘){
            let pdata = ‘‘;
            req.on(‘data‘,(chunk)=>{
                pdata += chunk;
            });
            req.on(‘end‘,()=>{
                let obj = querystring.parse(pdata);
                if(obj.username == ‘admin‘ && obj.password == ‘123‘){
                    res.end(‘post success‘);
                }else{
                    res.end(‘post failure‘);
                }
            });
        }
    }
 
}).listen(3000,()=>{
    console.log(‘running....‘);
});

const path = require(‘path‘);
const fs = require(‘fs‘);
const mime = require(‘./mime.json‘);
 
exports.staticServer = (req,res,root) => {
    fs.readFile(path.join(root,req.url),(err,fileContent)=>{
        if(err){
            // 没有找到对应文件
            res.writeHead(404,{
                ‘Content-Type‘:‘text/plain; charset=utf8‘
            });
            res.end(‘页面被狗狗叼走了‘);
        }else{
            let dtype = ‘text/html‘;
            // 获取请求文件的后缀
            let ext = path.extname(req.url);
            // 如果请求的文件后缀合理，就获取到标准的响应格式
            if(mime[ext]){
                dtype = mime[ext];
            }
            // 如果响应的内容是文本，就设置成utf8编码
            if(dtype.startsWith(‘text‘)){
                dtype += ‘; charset=utf8‘
            }
            // 设置响应头信息
            res.writeHead(200,{
                ‘Content-Type‘:dtype
            });
            res.end(fileContent);
        }
    });
}