Node.js mm131图片批量下载爬虫1.00

//======================================================// mm131图片批量下载爬虫1.00// 2017年11月15日//======================================================// 内置http模块var http=require("http");// 内置文件处理模块，用于创建目录和图片文件var fs=require(‘fs‘);// 用于转码。非Utf8的网页如gb2132会有乱码问题，需要iconv将其转码var iconv = require(‘iconv-lite‘);// cheerio模块，提供了类似jQuery的功能，用于从HTML code中查找图片地址和下一页var cheerio = require("cheerio");// 请求参数JSON。http和https都有使用var options;// request请求var req;// 图片数组，找到的图片地址会放到这里var pictures=[];//--------------------------------------// 爬取网页，找图片地址，再爬// pageUrl sample:http://www.mm131.com/xinggan/2852.html// pageUrl sample:http://www.mm131.com/xinggan/2853.html// pageUrl sample:http://www.mm131.com/xinggan/2976.html ?//--------------------------------------function crawl(pageUrl){ ???console.log("Current page="+pageUrl); ???// 得到hostname和path ???var currUrl=pageUrl.replace("http://",""); ???var pos=currUrl.indexOf("/"); ???var hostname=currUrl.slice(0,pos); ???????????var path=currUrl.slice(pos); ???????//console.log("hostname="+hostname); ???//console.log("path="+path); ???????// 初始化options ?????options={ ???????hostname:hostname, ???????????port:80, ???????????path:path,// 子路径 ?????????method:‘GET‘, ???????????}; ???req=http.request(options,function(resp){ ???????var html = []; ???????resp.on("data", function(data) { ???????????html.push(data); ???????}) ???????resp.on("end", function() { ???????????var buffer = Buffer.concat(html); ???????????var body = iconv.decode(buffer,‘gb2312‘); // 特地增加的，为了让汉字不乱码 ???????????//console.log(body); ???????????????????????var $ = cheerio.load(body); ???????????????????var picCount=0; ???????????// 找图片放入数组 ???????????$(".content-pic a img").each(function(index,element){ ???????????????var picUrl=$(element).attr("src"); ???????????????//console.log(picUrl); ???????????????if(picUrl.indexOf(‘.jpg‘)!=-1){ ???????????????????pictures.push(picUrl); ????????????????????picCount++; ???????????????} ????????????}) ??????????????console.log("找到图片"+picCount+"张."); ???????????????????????????????????????var nextPageUrl=null; ???????????// 找下一页 ???????????$(".content-page a").each(function(index,element){ ???????????????var text=$(element).text(); ???????????????if(text.indexOf(‘下一页‘)!=-1){ ???????????????????nextPageUrl=$(element).attr("href"); ???????????????????nextPageUrl="http://www.mm131.com/xinggan/"+nextPageUrl;// 把省略部分加上 ???????????????????console.log("找到下一页."); ???????????????} ????????????????????}) ???????????if(nextPageUrl==null){ ???????????????console.log(pageUrl+"已经是最后一页了.\n"); ???????????????download(pictures); ???????????}else{ ???????????????//console.log("下一页是"+nextPageUrl); ???????????????crawl(nextPageUrl); ???????????} ???????????????????}).on("error", function() { ???????????console.log("获取失败") ???????}) ???}); ???// 超时处理 ???req.setTimeout(7500,function(){ ???????req.abort(); ???}); ???// 出错处理 ???req.on(‘error‘,function(err){ ???????console.log(‘请求发生错误‘+err); ???????????}); ???// 请求结束 ???req.end();}//--------------------------------------// 下载图片//--------------------------------------function download(pictures){ ???var folder=‘pictures(‘+getNowFormatDate()+")"; ???// 创建目录 ???fs.mkdir(‘./‘+folder,function(err){ ???????if(err){ ???????????console.log("目录"+folder+"已经存在"); ???????} ???}); ???var total=0; ???total=pictures.length; ???console.log("总计有"+total+"张图片将被下载."); ???appendToLogfile(folder,"总计有"+total+"张图片将被下载.\n"); ???for(var i=0;i<pictures.length;i++){ ???????var picUrl=pictures[i]; ???????downloadPic(picUrl,folder); ???}}//--------------------------------------// 写log文件//--------------------------------------function appendToLogfile(folder,text){ ???fs.appendFile(‘./‘+folder+‘/log.txt‘, text, function (err) { ???????if(err){ ???????????console.log("不能书写log文件"); ???????????console.log(err); ???????} ???});}//--------------------------------------// 取得当前时间//--------------------------------------function getNowFormatDate() { ???var date = new Date(); ???var seperator1 = "-"; ???var seperator2 = "_"; ???var month = date.getMonth() + 1; ???var strDate = date.getDate(); ???if (month >= 1 && month <= 9) { ???????month = "0" + month; ???} ???if (strDate >= 0 && strDate <= 9) { ???????strDate = "0" + strDate; ???} ???var currentdate =date.getFullYear() + seperator1 + month + seperator1 + strDate ???????????+ " " + date.getHours() + seperator2 + date.getMinutes() ???????????+ seperator2 + date.getSeconds(); ???return currentdate;}//--------------------------------------// 下载单张图片// picUrl sample:http://img2.mm131.com:55888/pic/2852/1.jpg//--------------------------------------function downloadPic(picUrl,folder){ ???console.log("图片:"+picUrl+"下载开始"); ???// 得到hostname，path和port ???var currUrl=picUrl.replace("http://",""); ???var pos=currUrl.indexOf("/"); ???var hostname=currUrl.slice(0,pos); ???????????var path=currUrl.slice(pos); ???// 有端口加端口，没有端口默认80 ???var port=80; ???if(hostname.indexOf(":")!=-1){ ???????var arr=hostname.split(":"); ???????hostname=arr[0]; ???????port=arr[1]; ???} ???????//console.log("hostname="+hostname); ???//console.log("path="+path); ???//console.log("port="+port); ???var picName=currUrl.slice(currUrl.lastIndexOf("/")); ???????// 初始化options ?????options={ ???????hostname:hostname, ???????????port:port, ???????????path:path,// 子路径 ?????????method:‘GET‘, ?????????????headers:{ ?????????????????‘Referer‘:‘http://www.mm131.com‘, ?????????????????} ???}; ???req=http.request(options,function(resp){ ???????var imgData = ""; ???????resp.setEncoding("binary"); ????????resp.on(‘data‘,function(chunk){ ???????????imgData+=chunk; ???????????????????}); ???????resp.on(‘end‘,function(){ ???????????????????// 创建文件 ???????????var fileName="./"+folder+picName; ???????????fs.writeFile(fileName, imgData, "binary", function(err){ ???????????????if(err){ ???????????????????console.log("[downloadPic]文件"+fileName+"下载失败."); ???????????????????console.log(err); ???????????????????appendToLogfile(folder,"文件 ?"+picUrl+" ?下载失败.\n"); ???????????????}else{ ???????????????????appendToLogfile(folder,"文件 ?"+picUrl+" ?下载成功.\n"); ???????????????????console.log("文件"+fileName+"下载成功"); ???????????????} ???????????}); ???????????}); ???}); ???// 超时处理 ???req.setTimeout(7500,function(){ ???????req.abort(); ???}); ???// 出错处理 ???req.on(‘error‘,function(err){ ???????if(err){ ???????????console.log(‘[downloadPic]文件‘+picUrl+"下载失败,"+‘因为‘+err); ???????????appendToLogfile(folder,"文件"+picUrl+"下载失败.\n"); ???????} ???}); ???// 请求结束 ???req.end();}//--------------------------------------// 程序入口 //--------------------------------------function getInput(){ ???????????process.stdout.write("\033[35m 请输入第一页URL:\033[039m"); ???//紫色 ???process.stdin.resume(); ???process.stdin.setEncoding(‘utf8‘); ???????process.stdin.on(‘data‘,function(text){ ???????process.stdin.end();// 退出输入状态 ???????????????crawl(text.trim());// trim()是必须的！ ???????????}); ???}// 调用getInput函数，程序开始getInput();