抓取Google天气预报代码

  本款程序是一款简单的抓取Google天气预报代码哦，以前写的都是php,asp今天我发布一款jsp获取goolge天气代码哦。

  public NodeList getWeatherDiv(String htmlUrl) {
        NodeList res = null;
        try{
            Parser parser = new Parser(htmlUrl);
            parser.setEncoding("GBK");
            NodeFilter divFilter = new NodeClassFilter(Div.class);
            OrFilter lastFilter = new OrFilter();
            lastFilter
                    .setPredicates(new NodeFilter[] { divFilter });
            NodeList nodeList = parser.parse(lastFilter);
            Node[] nodes = nodeList.toNodeArray();
            for (int i = 0; i < nodes.length; i++) {
                Node anode = (Node) nodes[i];
                if(anode instanceof Div){
                    Div mydiv = (Div)anode;
                    String className = mydiv.getAttribute("class");
                    if(className!=null && className.equals("e")){
                        res = mydiv.getChildren();
                    }
                }
            }
        } catch (ParserException e) {
            e.printStackTrace();
        }
        return res;
    }   
   
    public static void cleanCache() {
        if(isStart) return;
        isStart = true;
        TimerTask task = new TimerTask() {
            public void run() {       
                Iterator it = hmCache.entrySet().iterator();
                while (it.hasNext()) {
                    Map.Entry entry = (Map.Entry) it.next();
                    Object key = entry.getKey();
                    String today = DateTimeUtil.format(new Date(),"yyyyMMdd");
                    if(key.toString().indexOf(today)>=0){
                        it.remove();
                        hmCache.remove(key);
                    }         
                }              
            }
        };
        Timer timer = new Timer();
        timer.schedule(task, Calendar.getInstance ().getTime(), 24*3600 * 1000);
     }    
   
   
    private void addWeatherDay(JSONObject json,int flag,String htmlContent){
        String tt = (flag==0?"t":("t"+flag));
        try{
                Node anode = null;
                Parser parser = Parser.createParser(htmlContent, "GBK");
                NodeFilter textFilter = new NodeClassFilter(TextNode.class);
                NodeFilter imgFilter = new NodeClassFilter(ImageTag.class);
               
                OrFilter lastFilter = new OrFilter();
                lastFilter.setPredicates(new NodeFilter[] { textFilter,imgFilter });
                //String t = "",t_res = "",t_tp="";
                NodeList nodeList = parser.parse(lastFilter);
                Node[] nodes = nodeList.toNodeArray();
                for (int i = 0; i < nodes.length; i++) {
                    anode = (Node) nodes[i];
                    if(anode instanceof ImageTag){
                        ImageTag img = (ImageTag)anode;
                        if(img!=null){
                            json.put(tt+"_res", img.getAttribute("title"));
                            json.put(tt+"_result", img.getAttribute("title"));
                            json.put(tt+"_tp", ("http://www.google.cn"+img.getImageURL()));
                        }
                    }else if(anode instanceof TextNode){
                        TextNode text = (TextNode)anode;
                        String t = text.getText();
                        if(t.indexOf("°C")>0){
                            json.put(tt, t);
                        }
                    }
                }
        }catch(Exception ex){
            ex.printStackTrace();
        }
    }
   
    private void getDivText(JSONObject json, String htmlContent) {
        String line = "";
        Node anode = null;
        Div divnode = null;
        try {
            Parser parser = Parser.createParser(htmlContent, "GBK");
            NodeFilter divFilter = new NodeClassFilter(Div.class);
            OrFilter lastFilter = new OrFilter();
            lastFilter.setPredicates(new NodeFilter[] { divFilter });
            NodeList nodeList = parser.parse(lastFilter);
            int idx = 0;
            Node[] nodes = nodeList.toNodeArray();
            for (int i = 0; i < nodes.length; i++) {
                anode = (Node) nodes[i];
                line = "";
                if (anode instanceof Div) {
                    divnode = (Div) anode;
                    String className = StrCharUtil.formatNullStr(divnode.getAttribute("class"));
                    String align = StrCharUtil.formatNullStr(divnode.getAttribute("align"));
                    if(align.equals("")) continue;
                    if(className.equals("") && align.equals("center")){
                        line = divnode.getChildrenHTML();
                        addWeatherDay(json,idx,line);
                        idx ++;
                    }
                   
                }
                if (StrCharUtil.formatNullStr(line).equals(""))
                    continue;
            }
        } catch (ParserException pe) {
            pe.printStackTrace();
        }
    }   
   
    public JSONObject getWeather(String city){
        String today = DateTimeUtil.format(new Date(),"yyyyMMdd");
        if(hmCache.get(city+today)!=null){
            return hmCache.get(city+today);
        }       
        JSONObject hm =new JSONObject();
        hm.put("zhishu","");
       
      
        try{
            city = getCityName(city);
            final String googleWeatherURL = "http://www.google.cn/search?hl=zh-CN&newwindow=1&q=tq+"+URLEncoder.encode(city,"UTF-8")+"&aq=f&oq=";
           
            NodeList nodeListDiv = getWeatherDiv(googleWeatherURL);
            int idx = 0;
            if(nodeListDiv!=null){
                getDivText(hm,nodeListDiv.toHtml());
            }
           
           
        }catch(Exception ex){
            ex.printStackTrace();
        }
       
       
        hmCache.put(city+today, hm);
        return hm;
    }