cuiyuwei.js

/*同步读取、写入文件，参考曹振同学的作业,感觉看nodejs documentation有点困难*/
// 引入FileSystem
var fs = require('fs');
// 定义要读取的路径
var readDirPath = '/Users/Administrator/learningjs/words-from-the-heart/';
//写入读取回来符合要求的文件的txt文件路径
var writeFilePath = '/Users/Administrator/learningjs/fileNameOfwordsheart_cuiyuwei.txt';
//判断读取路径是否存在，不存在做出警告
if(!fs.existsSync(readDirPath)){
	console.log('读取路径不存在，请填写正确路径');
}
else{
	var files = fs.readdirSync(readDirPath);
}
/*对读取回来的结果进行处理*/
for (var i = 0; i < files.length; i++) {
    if (!fs.statSync(readDirPath + files[i]).isFile()) {
        console.log('[Warning] ' + files[i]+ ' 不是文件');
    } 
    else if (files[i].match('\.json$') == null ) {
        console.log('[Warning] ' + files[i]+ ' 不是json')
    }
    else {
        fs.writeFileSync(writeFilePath, files[i]+'\n',{flag:'a'});
    }
}
/*异步读取、写入文件，参考曹振同学的作业*/
// 引入FileSystem
var fs = require('fs');
// 定义要读取的路径
var readDirPath = '/Users/Administrator/learningjs/words-from-the-heart/';
// 方案2:异步读取 异步写入
var writeFilePath = '/Users/Administrator/learningjs/fileNameOfwordsheart2_cuiyuwei.txt';
// 定义读取时的回调函数
function readCallback(err, files) {
    if (err) {
        console.log('读取路径失败');
    } 
	else {
        if (files.length > 0) {
			for (var i = 0; i < files.length; i++) {
                if (!fs.statSync(readDirPath + files[i]).isFile()) {
                        console.log('[Warning] ' + files[i]+ ' 不是文件');
                } 
                else if(files[i].match('\.json$') == null ) {
                        console.log('[Warning] ' + files[i]+ ' 不是json')
                }
                else{
					    fs.writeFile(writeFilePath,files[i]+'\n',{flag:'a'},writeCallback);
				}
            }
			
        }
		else {
            console.log('没有找到任何文件');
        }
    }
}
// 定义写入时的回调函数
function writeCallback(err) {
    if (err) {
        console.log('write error');
    } else {
        console.log('write success');
    }
}
fs.readdir(readDirPath, readCallback);