Replacing src attribute in IMG tag in Java

StackOverflow https://stackoverflow.com/questions/15690171

  •  30-03-2022
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質問

I have a HTML document in which I need to update both text and src attribute of IMG tag. I am working in Java. I want to replace following strings in the HTML: DataName, DataText and DataIcon. 

<body>

<h1 align="center">DataName</h1>

<div class="tabber">

     <div class="tabbertab">
      <h2>Info</h2>
      <p>DataText</p>
     </div>


     <div class="tabbertab">
      <h2>Pictures</h2>
        <div id="album">
            <ul class="gallery">
                <li><a href="#nogo" tabindex="1">1<img src=DataIcon alt="landscape image 1" title="landscape image 1" /></a></li>
                <li><a href="#nogo" tabindex="1">2<img src="C:\thesis\100GreatP\eclipse_ws\test\data\pictures\1\pyramid2.jpg" alt="landscape image 2" title="landscape image 2" /></a></li>
            </ul>
        </div>   
     </div>

     <div class="tabbertab">
      <h2>Video</h2>

     </div>

</div>

While I have suceeded to replace strings DataName and DataText, I havent succeed to replace DataIcon by my imageURL stored in the database as String. Checking the debug says that it just simply fails to search for DataIcon string. I am using HTMLparser and I have written following class to apply the problem: 

public class MyNodeVisitor extends NodeVisitor {
        String name;
        String text;
        String icon;

        public MyNodeVisitor() {

        }

        public MyNodeVisitor(String IconPath, String Name, String Text){
            this.name = Name;
            this.text = Text;
            this.icon = IconPath;
        }

        public void visitStringNode (Text string)
        {
            if (string.getText().equals("DataName")) {
                string.setText(name);
            }

            else if(string.getText().equals("DataIcon")){
                     string.setText(icon);

            }
            else if (string.getText().equals("DataText")){
                  string.setText(text);
            }
        }
    }

The class has been applied in my application code in such way

        NodeList nl = new NodeList();
        String htmlString = null;
        InputStream contentStream = null;
        String textString = null;       
        String resultStr = getDatabaseAttribute(name,"DESCRIPTION");
        String resultStr2 = getDatabaseAttribute(name,"NAME");
        String resultStr3 = getDatabaseAttribute(name,"ICON_path");


        try
        {
            // Read the URL content into a String using the default encoding (UTF-8).
        contentStream = WWIO.openFileOrResourceStream(BROWSER_BALLOON, this.getClass());
            htmlString = WWIO.readStreamToString(contentStream, null);

        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
        finally
        {
            WWIO.closeStream(contentStream, resultStr);
        }


        try {
            Parser parser = new Parser(htmlString);
            nl = parser.parse(null);

            nl.visitAllNodesWith(new MyNodeVisitor(resultStr3, resultStr2,resultStr));
            nl.toString();

        } catch (ParserException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        String output = nl.toHtml();

        return output;

Can anybody help me? The whole problem is that it fails to search for DataIcon string in IMG tag. Thanks for your help.

役に立ちましたか？

解決

Your img tag isn't an StringNode. You need to override the visitTag(Tag tag) method and work on the Tag object.

Something like (not compiled)

public void visitTag(Tag tag) {
    if ("img".equals(tag.getTagName())) {
        if ("DataIcon".equals(tag.getAttribute("src"))) {
            tag.setAttribute("src", icon);
        }
    }        
}
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