使用 Java 解析 <enclosure> 标记

Posted 2023-04-19

【中文标题】使用 Java 解析 <enclosure> 标记

【英文标题】：Parse <enclosure> tag using Java

【发布时间】：2017-11-27 04:04:37

【问题描述】：

我想解析这行 rss 提要

<enclosure url="http://media.nu.nl/m/32zx6jhahx6v_sqr256.jpg/verdachte-aanslag-moslims-in-londen-vervolgd-terroristische-moord.jpg" length="0" type="image/jpeg"></enclosure>

所以我可以在我的 ImageView 中使用它。

我已经编写了一个完整的类来解析 & 标签，但我不能以某种方式使用这个类，因为附件标签没有关闭，而是继续

这是我写的课

public class Rs-s-reader 
    //Lists to store headlines, descriptions & images
    String url = "http://www.nu.nl/rss/Algemeen";
    List<String> titleList;
    List<String> descriptionList;
    List<String> imageList;
    public Rs-s-reader() throws IOException
        titleList = readRSS(url, "<title>");
        descriptionList= listFilter(readRSS(url, "<description>"), "&amp;nbsp;", "");
        imageList = readRSS(url, "<enclosure>");
    
    public List<String> readRSS(String feedUrl, String tag) throws IOException, MalformedURLException 
        URL url = new URL(feedUrl);
        BufferedReader reader= new BufferedReader(new InputStreamReader(url.openStream()));
        String closingTag = new StringBuilder(tag).insert(1, "/").toString();
        String currentLine;
        List<String> tempList = new ArrayList<String>();
        while((currentLine = reader.readLine()) != null)
            Integer tagEndIndex = 0;
            Integer tagStartIndex = 0;
            while (tagStartIndex >= 0)
                tagStartIndex = currentLine.indexOf(tag, tagEndIndex);
                if(tagStartIndex >= 0)
                    tagEndIndex = currentLine.indexOf(closingTag, tagStartIndex);
                    tempList.add(currentLine.substring(tagStartIndex + tag.length(), tagEndIndex) + "\n");
                
            
        
        tempList.remove(0);
        return tempList;
    

    public List<String> getDesciptionList()
        return descriptionList;
    

    public List<String> getTitleList()
        return titleList;
    
    public List<String> getImageList()
        return imageList;
    

    public List<String> listFilter(List<String> tempList, String require, String replace)
        //Creates new List
        List<String> newList = new ArrayList<>();
        //Loops through old list and checks for the 'require' variable
        for(int i = 0; i < tempList.size(); i++)
            if(tempList.get(i).contains(require))
                newList.add(tempList.get(i).replace(require, replace));
            
            else
                newList.add(tempList.get(i));
            
        
        return newList;
    

谁能帮帮我？

【参考方案1】：

解决我自己的问题。见 imagelist + 构造函数

public class Rs-s-reader 
    //Lists to store headlines, descriptions & images
    String url = "http://www.nu.nl/rss/Algemeen";
    List<String> titleList;
    List<String> descriptionList;
    List<String> imageList;
    public Rs-s-reader() throws IOException
        titleList = readRSS(url, "<title>", "</title>");
        descriptionList= listFilter(readRSS(url, "<description>", "</description>"), "&amp;nbsp;", "");
        imageList = readRSS(url, "<enclosure url \"", "\" length=\"0\" type=\"image/jpeg\"</enclosure>");
    
    public List<String> readRSS(String feedUrl, String openTag, String closeTag) throws IOException, MalformedURLException 
        URL url = new URL(feedUrl);
        BufferedReader reader= new BufferedReader(new InputStreamReader(url.openStream()));

        String currentLine;
        List<String> tempList = new ArrayList<String>();
        while((currentLine = reader.readLine()) != null)
            Integer tagEndIndex = 0;
            Integer tagStartIndex = 0;
            while (tagStartIndex >= 0)
                tagStartIndex = currentLine.indexOf(openTag, tagEndIndex);
                if(tagStartIndex >= 0)
                    tagEndIndex = currentLine.indexOf(closeTag, tagStartIndex);
                    tempList.add(currentLine.substring(tagStartIndex + openTag.length(), tagEndIndex) + "\n");
                
            
        
        tempList.remove(0);
        return tempList;
    

    public List<String> getDesciptionList()
        return descriptionList;
    

    public List<String> getTitleList()
        return titleList;
    
    public List<String> getImageList()
        return imageList;
    

    public List<String> listFilter(List<String> tempList, String require, String replace)
        //Creates new List
        List<String> newList = new ArrayList<>();
        //Loops through old list and checks for the 'require' variable
        for(int i = 0; i < tempList.size(); i++)
            if(tempList.get(i).contains(require))
                newList.add(tempList.get(i).replace(require, replace));
            
            else
                newList.add(tempList.get(i));
            
        
        return newList;