我是靠谱客的博主 甜蜜路人,最近开发中收集的这篇文章主要介绍爬取天猫京东实例,觉得挺不错的,现在分享给大家,希望可以做个参考。

概述

1.需要的jar包:1)httpclient-4.5系列jar包;2)jsoup-1.6.1.jar
2.写在前面:基本的思路是模拟一个类似商城搜索的功能,封装好后可以做到一次搜索返回几个商城相同商品的信息,说高大上一点,就是小型比价系统。
3.示例
3.1 抓取京东商城商品
3.1.1
先上结果

1件商品:
商品:New balance/NB 热男鞋复古跑鞋NB新款生活休闲鞋运动鞋GM500NSG 黑色 44 
价格: 249.00元
第2件商品:
商品:New Balance NB 女鞋 跑步鞋 休闲鞋WL373SGL/SKM/SNG 藏青色WL373SNG 39/8/250MM 
价格:249.00元
第3件商品:
商品:New Balance NB 男鞋 经典复古鞋 休闲鞋M368LBK/LBR 黑色M368LBK 44/10/280MM 
价格: 249.50元
第4件商品:
商品:New balance/NB热男鞋复古跑步鞋2015新款休闲鞋500运动鞋GM500GSB 灰色 44 
价格: 259.50元
……………………………………

3.1.2 代码片段(仅供测试,请勿它用)

public class JingDongProduct implements Product{
    private String qury = null;  //请求的keyword相当于搜索框输入的词
    private String sort = "";    //商品结果排序类型

    @Override
    public void setQury(String qury) {
        this.qury  = qury;
    }
    @Override
    public String getQury(){
        return qury;
    }
    @Override
    public void setSortStyle(String sort) {
        this.sort = sort;
    }
    @Override
    public String getSortStyle() {
        return sort;
    }
    @Override
    public String getMessage() throws Exception {
        String result = null;
        try{    
            HttpClientBuilder builder = HttpClients.custom();  
            builder.setUserAgent("Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:0.9.4)");  
            CloseableHttpClient httpClient = builder.build(); 
            URI uri = new URI("http","search.jd.com","/Search",
            "keyword="+getQury()+getSortStyle()+"&enc=utf-    8&pvid=oy1a1hii.kd9cf",null);  //-------------------(1)
            HttpGet httpget = new HttpGet(uri);
           httpget.addHeader("Referer","http://www.jd.com/");//---(2)
            CloseableHttpResponse response = httpClient.execute(httpget);
            HttpEntity entity = response.getEntity();
            if (entity != null){        
                result = EntityUtils.toString(entity,"utf-8");
                EntityUtils.consume(entity);
            }
            response.close();
            httpClient.close();
        }catch(ClientProtocolException cpe){
            cpe.printStackTrace();
        }catch(IOException ioe){
            ioe.printStackTrace();
        }
        //价格
        Document doc = Jsoup.parse(result);
        Elements e1 = doc.select("[class=p-price]");
        List<Element> prices = e1.select("i");          
        //商品名称
        Elements e2 = doc.select("[class=p-name p-name-type-2]");
        List<Element> products = e2.select("em");   

        StringBuffer buffer = new StringBuffer();
        for(int i=0;i<products.size();i++){
            buffer.append("第"+(i+1)+"件商品:"+"rn");
            String product = products.get(i).siblingElements().text();
            buffer.append("商品:"+product+"rn");
            String price = prices.get(i).siblingElements().text().substring(1);     
            buffer.append("价格:"+price+"元"+"rn");
            buffer.append("rn");

            System.out.println("第"+(i+1)+"件商品:");
            System.out.println("商品:"+product);
            System.out.println("价格:"+price+"元");
            System.out.println();
        }
        return buffer.toString();                   
    }
    @Override
    public void saveToLocal(String result,String keyword, String sortStyle) throws IOException {
        if(sortStyle.contains("1")){
            sortStyle = "descend";
        }else if(sortStyle.contains("2")){
            sortStyle = "ascend";
        }else if(sortStyle.contains("3")){
            sortStyle = "sale";
        }else if(sortStyle.contains("4")){
            sortStyle = "criticism";
        }else if(sortStyle.contains("5")){
            sortStyle = "new";
        }else{
            sortStyle = "com";
        }
        Writer writer = new BufferedWriter(new OutputStreamWriter
                   (new FileOutputStream("tmp\"+keyword+"-"+sortStyle+"-"+"jindong.txt"),"gbk"));
        writer.write(result);
        writer.close(); 
    }

    public static void main(String[] args) throws Exception{
        double begin = System.currentTimeMillis();  
        String keyword = "新百伦";
        String sortStyle = jascendprice;   //结果按价格升序排
        JingDongProduct j = new JingDongProduct();
        j.setSortStyle(sortStyle);  
        j.setQury(keyword);
        String result = j.getMessage();  //打印并返回结果
        j.saveToLocal(result, keyword, sortStyle);  //保存至本地
        double timeConsume = System.currentTimeMillis() - begin; 
        System.out.println("耗时:" + timeConsume/1000 + "秒");
    }
}

3.1.3
比较关键的就是(1)处和(2)处。前者把URL地址包装成URI形式,最主要在于把搜索关键词部分keyword及排序类型sortStyle抽取出来,后面的字符串不能省略,不然会出错。因为这些商城页面都是动态的,不能直接抓取,所以(2)处加入了跳转模拟人工访问。

3.2 抓取天猫商城商品
3.2.1 结果

1件商品:
商品:New Balance 2015年新款男子支撑避震系列MR450CD3/MR450CG3
价格:249.00元
商家:top运动名品专营店
月成交额:8笔
第2件商品:
商品:New Balance 2015年新款中性复古鞋ML373SBB/ML373SRR
价格:249.00元
商家:top运动名品专营店
月成交额:0笔
第3件商品:
商品:New Balance/NB 女款长袖针织连帽外套 运动衫休闲外套AWJ53506
价格:258.30元
商家:New Balance旗舰店
月成交额:96笔
第4件商品:
商品:New Balance 2015年新款 中性373系列复古鞋ML373SNR
价格:275.00元
商家:top运动名品专营店
月成交额:32

3.2.2 代码(仅供测试,请勿它用)

public class TianMaoProduct implements Product{
    private String qury = null;
    private String sort = "";

    @Override
    public void setQury(String qury) {
        this.qury = qury;
    }
    @Override
    public String getQury(){
        return qury;
    }
    @Override
    public void setSortStyle(String sort){
        this.sort  = sort;
    }
    @Override
    public String getSortStyle(){
        return sort;
    }
    @Override
    public String getMessage()throws Exception {    
        String result = null;
        try{    
            HttpClientBuilder builder = HttpClients.custom();  
            builder.setUserAgent("Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:0.9.4)");  
            CloseableHttpClient httpClient = builder.build(); 
            URI uri = new URI("https","list.tmall.com","/search_product.htm",
                    "q="+getQury()+getSortStyle(),null); //--(1)
            HttpGet httpget = new HttpGet(uri);
            httpget.addHeader("Referer","https://www.tmall.com/?spm=a220m.1000858.a2226mz.1.RzPkM0"); //----------(2)
            CloseableHttpResponse response = httpClient.execute(httpget);
            HttpEntity entity = response.getEntity();
            if (entity != null){                
                result = EntityUtils.toString(entity,"gbk");
                EntityUtils.consume(entity);
            }
            response.close();
            httpClient.close();
        }catch(ClientProtocolException cpe){
            cpe.printStackTrace();
        }catch(IOException ioe){
            ioe.printStackTrace();
        }

        //价格
        Document doc = Jsoup.parse(result);
        Elements e1 = doc.select("[class=productPrice]");
        List<Element> prices = e1.select("em");         
        //商品名称
        Elements e2 = doc.select("[class=productTitle]");
        List<Element> products = e2.select("a");    
        //商店
        Elements e3 = doc.select("[class=productShop]");
        List<Element> shops = e3.select("a");
        //月成交额
        Elements e4 = doc.select("[class=productStatus]");
        List<Element> status = e4.select("em");
        StringBuffer buffer = new StringBuffer();
        for(int i=0;i<products.size();i++){
            buffer.append("第"+(i+1)+"件商品:"+"rn");
            String product = products.get(i).siblingElements().text();
            buffer.append("商品:"+product+"rn");
            String price = prices.get(i).siblingElements().text().substring(1);     
            buffer.append("价格:"+price+"元"+"rn");
            String shop = shops.get(i).siblingElements().text();
            buffer.append("商家:"+shop+"rn");
            String statu = status.get(i).siblingElements().text();
            buffer.append("月成交额:"+statu+"rn");
            buffer.append("rn");
            System.out.println("第"+(i+1)+"件商品:");
            System.out.println("商品:"+product);
            System.out.println("价格:"+price+"元");
            System.out.println("商家:"+shop);
            System.out.println("月成交额:"+statu);
            System.out.println();
        }
        return buffer.toString();
    }

    @Override
    public void saveToLocal(String result,String keyword,String sortStyle) throws IOException{
         if(sortStyle.contains("pd")){
             sortStyle = "descend";
         }else if(sortStyle.contains("p")){
             sortStyle = "ascend";
         }else if(sortStyle.contains("sort=d")){
             sortStyle = "sale";
         }else if(sortStyle.contains("sort=rq")){
             sortStyle = "popularity";
         }else if(sortStyle.contains("new")){
             sortStyle = "new";
         }else if(sortStyle.contains("sort=s")){
             sortStyle = "com";
         }else {
             sortStyle = "qita";
         }       

         Writer writer = new BufferedWriter(new OutputStreamWriter
                   (new FileOutputStream("tmp\"+keyword+"-"+sortStyle+"-"+"tianmao.txt"), "gbk"));
         writer.write(result);
         writer.close();  
    }

    public static void main(String[] args) throws Exception{
        double begin = System.currentTimeMillis();
        String keyword = "新百伦";
        String sortStyle = tascendprice;  //按价格升序
        TianMaoProduct t = new TianMaoProduct();
        t.setSortStyle(sortStyle);  
        t.setQury(keyword);
        String result = t.getMessage();     
        t.saveToLocal(result,keyword ,sortStyle);
        double timeConsume = System.currentTimeMillis() - begin; 
        System.out.println("耗时:" + timeConsume/1000 + "秒");
    }
}

3.2.3
跟上例相同,(1)和(2)处是关键,不同的是此处的(1)不同写全uri的qury部分,天猫商城的服务端识别到请求后应该是会自动加上那些省略的部分,所以可以偷懒不写,当然写上也不会怀孕。(2)处没什么好说的,同样是设置跳转。

4 其实还有一个接口类,现在丢上来(仅供测试,请勿它用)

public interface Product {
    //tianmao---
    static final String tcom = "&sort=s";           //按综合
    static final String tsales = "&sort=d";         //按销量-降序
    static final String tascendprice = "&sort=p";     //按价格-升序
    static final String tdescendprice = "&sort=pd";   //按价格-降序
    static final String tpopularity = "&sort=rq";   //按人气降序
    static final String tnew = "&sort=new";         //按新品-降序
    //jingdong--
    static final String jcom = "";                  //按综合
    static final String jdescendprice = "&psort=1";    //按价格-降序
    static final String jascendprice = "&psort=2";     //按价格-升序
    static final String jsales = "&psort=3";        //按销量-降序
    static final String criticismNum = "&psort=4";  //按评论数-降序   
    static final String jnew = "&psort=5";         //按新品-降序


    void setQury(String qury);       //设置搜索词
    String getQury();

    void setSortStyle(String sort);  //设置排序类型
    String getSortStyle();

    String getMessage()throws Exception;

    //保存数据至本地
    void saveToLocal(String result, String keyword, String sortStyle) throws IOException;
}

5 后话
之前听说httpclient只能抓静态页面,一天下午突然心血来潮想试试能不能抓到天猫的数据,折腾了半个下午终于发现是可以的。但个人觉得主要还存在几个问题。
1)在搜索出来的首页,京东页面的销量数据是看不到的,怎么抓取这部分数据呢,抑或是抓评论数来替代。
2)图片暂时没理它
2)数据保存问题

最后

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