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ruby代码

#encoding: utf-8

require 'net/http'
require 'open-uri'
require 'nokogiri' # 用于解析html的模块
                   # sudo apt-get install libxslt-dev libxml2-dev
                   # sudo gem install nokogiri
require 'pathname'

class JanDanSpider
    attr_accessor :base_uri, :cur_page # 定义属性访问器

    def initialize(pagesize)
        @base_uri = 'http://jandan.net/pic' # @表示实例变量、@@表示类变量、$表示全局变量
        @dir = '/media/Develop/MyCode/SevenLang/ruby/pic'
        @pagesize = Integer(pagesize) # 整型转换
    end

    def crawl()
        Dir.mkdir @dir unless File.directory? @dir # 表判断的方法结尾都有个?
        totalpage = crawlpage(0)
        puts "pagesize #{totalpage}" # ""字符会引发字符串替换，''则不会
        (1..@pagesize-1).each do |i| # 遍历元组
            crawlpage(totalpage - i)
        end
        puts 'complete!'
    end

    def crawlpage(page)
        url = page==0 ? @base_uri : @base_uri+'/page-'+page.to_s # to_s是必要的
        puts "crawl-page: #{url}"

        fpage = open(url)
        html = fpage.read
        doc = Nokogiri::HTML(html)
        doc.css('ol.commentlist li').each { |comment|
            match = /comment-(\d+)/.match(comment['id'])
            if match
                id = match[1]
                oo = Integer(comment.css('#cos_support'+'-'+id)[0].content);
                xx = Integer(comment.css('#cos_unsupport'+'-'+id)[0].content);
                xx = 1 if xx==0
                if(oo>xx && (oo>200 || oo/xx >10) )
                    src = comment.css('p img')[0]["src"]
                    puts "crawl: oo #{oo} xx #{xx} src #{src}"
                    save_pic(src)
                end
            end
        }
        if page==0
            cur_page = doc.css(".current-comment-page")[0].content
            page = Integer(/\d+/.match(cur_page).to_s)
        end
        puts "page #{page} done!"
        page # ruby中每条语句都有返回值，函数内最后一条语句的返回值会被return
    end

    def save_pic(url)
        urlpath = Pathname.new(url)
        filename = urlpath.basename.to_s
        dirpath = Pathname.new(@dir)
        filepath = dirpath.join(filename).to_s
        open(url) { |fin|
            open(filepath,"wb") { |fout|
                while buf = fin.read(4096) do
                    fout.write buf
                end
            }
        } unless File.exists? filepath # 仅当文件不存在时进行抓取
        puts 'done!'
    end

end

if ARGV.length == 1
    spider = JanDanSpider.new($*[0]) # 可从 ARGV 或 $* 读取命令行参数
    spider.crawl()
else
    puts 'please input pagesize' #tip: puts, 转义+换行符 print, 转义 p, 换行
end

python

 #python-string
 #python中的字符串用单引号''和双引号""标示
 strA = 'this is a string'
 strB = "this is a message!"

 #打印两个字符串
 print("打印两个字符串")
 print('strA = ' + strA)
 print('strB = ' + strB)

 print("#############################")

 strC = 'I don\'t know anything'
 strD = '\'Yes\',I know.'

 print("字符串中的转移字符")
 print('strA = ' + strC)
 print('strB = ' + strD)

 print("#############################")

 strE = '这是我的blog，欢迎大家来\n我的博客园溜达'

 print("字符串中的换行")
 print('strA = ' + strE)

 print("#############################")

 strF = 'this is ''message'
 strG = 'Hongten'
 strH = strG * 3

 print('字符串可以用\'+\'号连接(或者说粘合)，也可以用\'*\'号循环')
 print('strF原有形式为：\'this is \'\'message\'')
 print('粘合后的strF：' + strF)
 print('strG原值为：\'Hongten\',strH = strG * 3,此时strH为：' + strH)      

 print("#############################")
 strI = 'hongtenzone@foxmail.com'

 print('字符串可以使用下标(索引)查询')
 print('源字符串strI = \'hongtenzone@foxmail.com\'')
 print('字符串strI的长度，len(strI) = ')
 print(len(strI))
 print('strI[0] = ' + strI[0])
 print('strI[10] = ' + strI[10])
 print('strI[-1] = strI[len(strI) - 1]')
 print('strI[-1] = ' + strI[-1])
 print('strI[len(strI) - 1] = ' + strI[len(strI) - 1])

 print("#############################")

 print('Python 字符串不能改写。按字符串索引赋值会产生错误:')
 print('strI[0] = \'x\',这样就会产生错误啦')

 print("#############################")

 print('过大的索引代替为字符串大小，下界比上界大的返回空字符串')
 print('strI[0:100] = ' + strI[0:100])

 print("#############################")

 print('索引可以是负数，计数从右边开始')
 print('strI[-2] = ' + strI[-2])
 print('strI[-23:] = ' + strI[-23:])

 print("#############################")

 print('不过-0 还是0，所以它不是从右边计数的！')
 print('strI[0] = ' + strI[0])
 print('strI[-0] = ' + strI[-0])

java

/*
     * PROXY_HOST：代理的IP地址
     * PROXY_PORT_INT：代理的端口号
     */
    Proxy proxy=newProxy(Proxy.Type.HTTP, newInetSocketAddress(PROXY_HOST, PROXY_PORT_INT));
    URL url=newURL(urlStr);
    URLConnection conn=url.openConnection(proxy);
    InputStream is=conn.getInputStream();

html5js

/**
 * 这里只实现垂直滚动
 */
var parent = document.getElementById('parent');
var content = document.getElementById('content')
var startY = 0; // 初始位置
var lastY = 0; // 上一次位置

parent.addEventListener('touchstart', function(e) {
    lastY = startY = e.touches[0].pageY;
});
parent.addEventListener('touchmove', function(e) {
    var nowY = e.touches[0].pageY;
    var moveY = nowY - lastY;
    var contentTop = content.style.top.replace('px', '');
    // 设置top值移动content
    content.style.top = (parseInt(contentTop) + moveY) + 'px';
    lastY = nowY;

});
parent.addEventListener('touchend', function(e) {
    // do touchend
    var nowY = e.touches[0].pageY;
    var moveY = nowY - lastY;
    var contentTop = content.style.top.replace('px', '');
    // 设置top值移动content
    content.style.top = (parseInt(contentTop) + moveY) + 'px';
    lastY = nowY;
});

　　

/**
 * 这里只实现垂直滚动
 */
var parent = document.getElementById('parent');
var content = document.getElementById('content')
var startY = 0; // 初始位置
var lastY = 0; // 上一次位置

parent.addEventListener('touchstart', function(e) {
    lastY = startY = e.touches[0].pageY;
});
parent.addEventListener('touchmove', function(e) {
    var nowY = e.touches[0].pageY;
    var moveY = nowY - lastY;
    var contentTop = content.style.top.replace('px', '');
    // 设置top值移动content
    content.style.top = (parseInt(contentTop) + moveY) + 'px';
    lastY = nowY;

});
parent.addEventListener('touchend', function(e) {
    // do touchend
    var nowY = e.touches[0].pageY;
    var moveY = nowY - lastY;
    var contentTop = content.style.top.replace('px', '');
    // 设置top值移动content
    content.style.top = (parseInt(contentTop) + moveY) + 'px';
    lastY = nowY;
});