node基础总结（二）

获取路由（访问路径）

6_path.js代码：

var http = require('http');
var url = require('url');
var router = require('./6_router.js');
http.createServer(function  (request,  response)  {  
    response.writeHead(200,  {'Content-Type':  'text/html;  charset=utf-8'});  
    if(request.url!=="/favicon.ico"){  //清除第2此访问  
        var pathname = url.parse(request.url).pathname;
        console.log(pathname);
        pathname = pathname.replace(///, '');//替换掉前面的/
        console.log(pathname);
        router[pathname](request,response);
        response.end('');
    }  
}).listen(8000);  
console.log('Server running at http://localhost:8000');

统计目录6_router.js代码：

module.exports={
    login:function(req,res){
        res.write("我是login方法");
    },
    register:function(req,res){
        res.write("我是注册方法");
    },
    index:function(req,res){
        res.write("我是index方法");
    }
}

---

读写文件

7_readFile.js代码：

var http = require('http');
var optfile = require('./7_optfile.js');
http.createServer(function  (request,  response)  {  
    response.writeHead(200,  {'Content-Type':  'text/html;  charset=utf-8'});  
    if(request.url!=="/favicon.ico"){  //清除第2此访问  
        function closeResponse(res){
            res.write('<br/>');
            res.end('完毕！');
        }
        console.log('访问');
        response.write('文件操作：');
        //异步读取文件
        //optfile.readfile(response,"D:\text.txt",function(){closeResponse(response);});
        //同步读取文件
        //optfile.readfileSync(response,"D:\text.txt");
        //closeResponse(response);
        
        //异步写文件
        //optfile.writefile(response,"D:\text.txt","bbbbbbbbbbbbbb",function(){closeResponse(response);});
        //同步写文件
        //optfile.writeFileSync(response,"D:\text.txt","ccccccccccccccccccccccccc");
        //closeResponse(response);
    }  
}).listen(8000);
console.log('Server running at http://localhost:8000/');

统计目录7_optfile.js代码：

var  fs=  require('fs');
module.exports={
    readfile:function(res,path,callBack){          //异步执行
        fs.readFile(path, function(err,data)  {
            if(err){
              res.write(err);
            }else{
              res.write(data.toString());
            }
            res.write("123");
            callBack();
        });
    console.log("异步方法执行完毕");
    },
    readfileSync:function(res,path){      //同步读取
        var data = fs.readFileSync(path,'utf-8');
        res.write(data.toString());
        console.log("同步方法执行完毕");
        return  data;
    },// appendFile 如果文件不存在，会自动创建新文件  
    // writeFile 会删除旧文件，直接写新文件  
    writefile:function(res,path,data,callBack){    //异步方式
        fs.writeFile(path,data,function  (err)  {
            if(err){
                res.write(err);
            }else{
                res.write("写入文件【"+data+"】成功！");
            }
            callBack();
        });
    },
    writeFileSync:function(res,path,data){  //同步方式
        fs.writeFileSync(path,data);
        res.write("写入文件【"+data+"】成功！");
    }
}

---

读取本地图片显示在浏览器上：

8_readImage.js代码：

var http = require('http'),
fs = require('fs');
http.createServer(function(req, res) {
    res.writeHead(200, {'Content-Type': 'image/jpeg'});
    fs.readFile('D:\download\Images\123touxiang.png','binary',function(err, file) {
        if (err) {
            res.write(err);
        }else{
            res.write(file,'binary');
        }
        res.end();
    });
}).listen(8888);

同步读取图片

var http = require('http'),
fs = require('fs');
http.createServer(function(req, res) {
    res.writeHead(200, {'Content-Type': 'image/jpeg'});
    var file = fs.readFileSync('D:\download\Images\123touxiang.png','binary');
    res.write(file,'binary');
    res.end();
}).listen(8888);